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1
Azis, Hastuti, Pawenary Pawenary, and Meyhart Torsna Bangkit Sitorus. "Simulasi Pemodelan Sistem Eksitasi Statis pada Generator Sinkron terhadap Perubahan Beban." Energi & Kelistrikan 11, no. 2 (July 30, 2019): 46–54. http://dx.doi.org/10.33322/energi.v11i2.483.
Повний текст джерелаАнотація:
Excitation system is one of the most important parts of synchronous generators, where the system functions to provide dc power to the field generator coil. Iin this study, a static excitation system consisting of transformers and connected thyristors in bridge configuration has been implemented in synchronous machines that operate as 206,1 mva capacity generators, 16,5 kv using the help of matlab simulink r2017b software. By adjusting the load given to the generator, variations in excitation currents can affect the amount of output voltage generated by the generator so that it can increase and decrease the induced voltage. In full load conditions, namely p = 175 mw, q = 100 mvar, the results of the study show that when the simulation is run at alpha 0 °, it is known that the average value of dc voltage is 496,4 v, excitation current is 1057 a and voltage generator output has increased beyond its nominal voltage of 16,72 kv. in this case, to maintain the terminal voltage, the excitation current must be reduced by increasing the angle of shooting of the thyristor to an alpha angle of 45 °, so that the average dc voltage can be reduced to 479,3 v, as well as the excitation current to 985,9 a. the generator output voltage at the alpha 45 ° angle is obtained according to its nominal value of 1,.5 kv.
2
Zalhaf, Amr, Mazen Abdel-Salam, and Mahmoud Ahmed. "An Active Common-Mode Voltage Canceler for PWM Converters in Wind-Turbine Doubly-Fed Induction Generators." Energies 12, no. 4 (February 21, 2019): 691. http://dx.doi.org/10.3390/en12040691.
Повний текст джерелаАнотація:
Wind energy integration in power grids is increasing day by day to reduce the use of fossil fuels, and consequently greenhouse gas emissions. Using the pulse-width modulated (PWM) power converters in wind turbine generators, specifically in doubly-fed induction generators, results in generating a common-mode voltage (CMV). This common-mode voltage causes a flow of common-mode current (CMC) that leaks through the stray capacitances in the generator structure. These currents impose a voltage on the generator bearing which may deteriorate them. In the current work, an active common-mode voltage canceler (ACMVC) is developed to eliminate the CMV produced by a PWM converter. The ACMVC generates a compensating voltage at the converter terminals to eliminate the CMV with a subsequent reduction of the voltage stress on the generator bearing. This compensating voltage has the same amplitude as CMV, but opposite polarity. A simulation of the ACMVC model is performed using the PSCAD/EMTDC (Electromagnetic Transient Design and Control) software package. Results confirm the effectiveness of ACMVC in canceling not only the CMV but the CMC and bearing voltage as well. In addition, the relationship between the rise time of CMV and the peak value of CMC is investigated.
3
Veinović, Slavko, Žarko Janda, Đorđe Stojić, Jasna Dragosavac, Dušan Joksimović, Ilija Klasnić, and Milan Đorđević. "Load angle estimation of synchronous generator." Zbornik radova Elektrotehnicki institut Nikola Tesla 30, no. 30 (2020): 81–91. http://dx.doi.org/10.5937/zeint30-29158.
Повний текст джерелаАнотація:
In this paper a load angle estimation method of round rotor synchronous generator is presented, for load angle limiter in AVR systems design purpose. To get information of load angle, it is necessary to have values of the one terminal voltage, one phase current and q-axis reactance Xq. Mentioned values are acquired by synchronous sampling technique and processed by discrete Fourier transformation. The accuracy of presented method highly depends on quality of zero-crossing detection of the input voltage signal and on the calculation estimation of the fundamental frequency. This method is of reduced sensitivity to higher harmonics presence contence in voltages and current waveforms. Another advantage, when compared to other dq or ab based calculations estimations, is the necessity of use only two measurement channels. Drawback of described approach is lack of immunity to current asymmetry. However, a solution to overcome this problem is offered by introducing the additional measurements into the algorithm to extract the synchronous sampled direct components of all three phase currents.
4
Oktaviani, Wiwin A., Taufik Barlian, and Yosi Apriani. "Studi Awal Karakteristik Tegangan Ouput Generator Magnet Permanen dan Generator DC pada Turbin Kubah Masjid Putar." Electrician 14, no. 2 (May 15, 2020): 56–63. http://dx.doi.org/10.23960/elc.v14n2.2149.
Повний текст джерелаАнотація:
Intisari — Setiap yang berputar memiliki potensi energi kinetik, tidak terkecuali putaran kubah masjid. Penelitian ini bertujuan untuk mengetahui potensi pemanfaatan kubah putar masjid sebagai penghasil energi listrik skala kecil. Generator yang diuji cobakan adalah generator magnet permanen dan generator DC yang dirangkaikan dengan turbin kubah putar. Pengujian dilakukan di dua lokasi, di Jembatan Musi 2 Palembang dan di perairan Sungsang Kabupaten Banyuasin untuk mengukur besaran tegangan dan arus output yang dihasilkan pada berbagai kecepatan angin menggunakan multimeter dan anemometer. Hasil penelitian menunjukkan bahwa tegangan yang dihasilkan oleh putaran kubah masjid menggunakan generator magnet permanen mampu mencapai 14,21 V pada kecepatan angin 3,8 m/det dibandingkan dengan generator DC yang hanya mencapai 3 V pada kecepatan angin 8 m/det. Jika ditinjau dari besaran arus, generator magnet permanen menghasilkan arus konstan sebesar 0,3 A sedangkan pada generator DC arus yang dihasilkan tidak terukur karena nilainya yang amat kecil. Penelitian ini menunjukkan bahwa kubah putar masjid dapat dijadikan sebagai turbin angin pada daerah yang memiliki kecepatan angin rendah.
Kata kunci — kubah masjid putar,generator magnet permanen,generatorDC, turbin angin kecepatan rendah
Abstract - Every spinning has kinetic energy potential; the mosque dome is no exception. This study aims to determine the potential use of the mosque's turning dome as a producer of small-scale electrical energy. Two types of the generator were tested, which were permanent magnet generator and DC generator, which were coupled with a rotary dome turbine. The test was carried out at two locations, at Palembang Musi 2 Bridge and in the waters of Sungsang, Banyuasin Regency, to measure the amount of voltage and output current generated at various wind speeds using a multimeter and anemometer. The results showed that the voltage generated by the mosque's dome rotation using a permanent magnet generator was able to reach 14.21 V at wind speeds of 3.8 m / sec compared to DC generators, which only reached 3 V at 8 m / s wind speed. When viewed from the amount of current, permanent magnet generators produce a constant current of 0.3 A while in DC generators, the current generated is not measurable because the value is minimal. This research shows that the mosque's rotary dome can be used as a wind turbine in areas that have low wind speeds.
Keywords - rotary mosque domes, permanent magnet generators, generator DC, low speed wind turbines
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Najma Safienatin Najah, Arief Muliawan, and Febria Anita. "Perancangan Prototipe Turbin Angin Sumbu Horizontal Skala Laboratorium Dengan Inverter." Jurnal Teknik Juara Aktif Global Optimis 1, no. 1 (June 30, 2021): 24–29. http://dx.doi.org/10.53620/jtg.v1i1.7.
Повний текст джерелаАнотація:
A horizontal axis wind turbine design research has been carried out using an inverter. This study aims to generate the output power generated by the generator through an inverter. So that the use of an inverter can turn on the 10 watt lamp. From the research results obtained turbine rotation varied between 1357 rpm to 2415 rpm producing a generator voltage of 3.05 volts to 4.61 volts and generator currents 32mA up to 49 mA. The inverter produces a voltage of 16.57 volts up to 20.46 volts and an inverter current of 0.60 amperes up to 0.48 amperes. The greater the rotation of the wind turbine turbine, the greater the generator voltage generated and so is the voltage of the inverter. While the current will increase as the turbine rotation increases and the inverse of the inverter current will decrease as the turbine rotation increases.
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Enemor, C. G., D. C. Idoniboyeobu, and S. L. Braide. "Performance Analysis of Synchronous Reluctance Generator." International Journal for Research in Applied Science and Engineering Technology 10, no. 5 (May 31, 2022): 765–74. http://dx.doi.org/10.22214/ijraset.2022.41501.
Повний текст джерелаАнотація:
Abstract: The synchronous reluctance generators are a species of self-excited generators such as the induction generators. The self-excited synchronous reluctance generator (SynRG) has become a promising and viable replacement of self-excited induction generator because of the supply frequency dependence on the prime speed and not load. The self-excited synchronous reluctance generator has high reliability, low cost and robustness and capacity of variable speed operation. The aim of this research is to carry out performance analysis of shunt connected three-phase synchronous reluctance generator feeding an R-L load. The dynamic analysis is based on the classical d-q model where equations for electrical quantities were derived and implemented using a computer simulation tool, MATLAB®. The equations for steady state analysis were derived from the dynamic equations by setting all time variables to zero. The dynamic analysis was carried out on a 4-pole, speed of 1500 rpm with connected load at a fixed excitation capacitor value of 50uF for a 2.5kVA machine. Effect of excitation-capacitance variation and loadingconditions variation on the generated output voltage and frequency are presented and discussed. The load variations were done based on energy-current perturbation at a fixed power factor of 1.0. The load variations were done at several points and result shows that with the variations in the connected loads, the output frequency of the synchronous reluctance generator remains constant, which makes it a good alternative for induction generator. On the steady state analysis, it was discovered that on increasing the excitation capacitor, the terminal voltage increases as well as the output power. The result specifically revealed that when the capacitance increases from 25uF to 45uF, the terminal voltage and the output power increases from 200volts to 300volts; and 200watt to 1700watt. Therefore, it is recommended that to ensure machine excitation, the capacitor should not be reduced below a certain value. The study is beneficial for operation of an isolated power supply. Keywords: Synchronous Reluctance Generator, Direct Current and Indirect Current
7
Wu, Xiushan, Yanzhi Wang, Siguang An, Jianqiang Han, and Ling Sun. "A Four Quadrature Signals’ Generator with Precise Phase Adjustment." Journal of Electrical and Computer Engineering 2016 (2016): 1–6. http://dx.doi.org/10.1155/2016/2138794.
Повний текст джерелаАнотація:
A four-way quadrature signals generator with precise phase modulation is presented. It consists of a phase precision regulator and a frequency divider. The phase precision regulator generates two programmable currents by controlling the conduction of the tail current sources and then changes the currents into two bias voltages which are superimposed on the clock signals to adjust the phase difference of the four quadrature signals generated by the frequency divider, making the phase difference of 90 degrees. The four quadrature signals’ generator with precise phase modulation has been implemented in a 0.18 μm mixed-signal and RF 1P6M CMOS technology. The size of the chip including the pads is675 μm⁎690 μm. The circuit uses a supply voltage of 1.8 V, a bias current of 7.2 μA, and the bits of phase-setting input leveln=6in the design. The measured results of the four orthogonal signals’ phase error can reach ±0.1°, and the phase modulation range can reach ±3.6°.
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Amin, Darojatul, Trapsilo Prihandono, and Alex Harijanto. "ANALISIS LOST ENERGY PADA OVERUNITY GENERATOR MAGNET PERMANEN DENGAN PROTOTIPE DINAMO JENIS FLUKS RADIAL." JURNAL PEMBELAJARAN FISIKA 11, no. 1 (April 1, 2022): 28. http://dx.doi.org/10.19184/jpf.v11i1.30638.
Повний текст джерелаАнотація:
The practice of overunity generators that is developing in the community is quite worrying due to the lack of clear sources of information. The aim of this research is to provide a conceptual overview of the overunity generator through a description of the system and the energy conversion process in the overunity machine. This concept surgery method uses lab tests to get accurate measurement data. By using the modeling of two dynamos connected into a series circuit, the test is carried out by providing electrical energy with different voltage variations to obtain data in the form of output voltage, output current, and rotational speed. The results obtained indicate that there is lost energy in the overunity generator due to the relatively low engine specifications and the limited ability of the motor and generator to convert energy. Where the output generated by the overunity generator has a very large difference compared to the input energy given. Which means that the overunity of the system has not been fully proven in the practice of overunity generators.
Key word: overunity, generator, lost energy
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Kwok, C. Y. "Low-voltage peaking complementary current generator." IEEE Journal of Solid-State Circuits 20, no. 3 (June 1985): 816–18. http://dx.doi.org/10.1109/jssc.1985.1052389.
Повний текст джерела
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Kozak, Maciej. "Initial Excitation Issues of Synchronous Generator with VSI Inverter in Varying Rotational Speed Operation." Multidisciplinary Aspects of Production Engineering 1, no. 1 (September 1, 2018): 377–83. http://dx.doi.org/10.2478/mape-2018-0048.
Повний текст джерелаАнотація:
Abstract Synchronous self-excited generators still are and probably will be the most popular 3-phase alternators installed in inland power stations so onboard of seagoing ships. Because of fuel savings and environmental restrictions Diesel, dual-fuel and gas propulsion engines for alternators of wide-range varying revolutions drives are increasingly used. There must be efficient way of creating 3-phase voltages of desired constant parameters ensured when generator produces variable amplitudes and frequencies of voltages because of changing rotational speed. As the control method modified field oriented control widely used with squirrel cage induction machines was chosen. This control method involves decoupling of currents and control voltages to flux and torque components and keeping them in optimal (orthogonal) condition. In order to obtain proper excitation and operation of such generator several factors have to be taken into account. Nonlinear dependence of voltage generated from rotational speed of self-excited synchronous generator is one of the factors that affects initial excitation process thus specific control method while generator startup. Theoretical background of synchronous generator excitation and voltage source inverter adopted FOC control method along with experimental results obtained in laboratory test bench of 5,5 kW generator and conclusions were presented.
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Setyawan, Eko Yohanes, Choirul Soleh, Awan Uji Krismanto, I. Wayan Sujana, Soeparno Djiwo, and Tutut Nani Prihatmi. "Design and Performance Analysis of Double Axial Flux Permanent Magnet Generator." Trends in Sciences 19, no. 6 (March 3, 2022): 3049. http://dx.doi.org/10.48048/tis.2022.3049.
Повний текст джерелаАнотація:
In this paper, a new permanent magnet generator structure was proposed in order to facilitate the implementation of the permanent magnet generator on small-scale renewable energy-based power generators. Detail characteristics of a double axial flux permanent magnet generator were analyzed. The proposed generator structure consisted of 2-sided rotors equipped with slots for placing permanent magnets. The stator side comprised 3 groups of coreless winding for realizing 3-phase output. Performances of the axial flux double permanent magnet generator were observed involving the output voltage, currents, and power. Two experimental scenarios have been tested to monitor the performance of the generator. In the first scenario, the loading condition which was represented by the star connection of 3 bulbs of 25 W has been considered. The rotational speed of the tested generator in this scenario was 501.9 rotation per minute (rpm). Under those loading circumstances, 3-phase sinusoidal output voltages with frequencies under 50 Hz have been monitored. Above 50 Hz operational frequency, the output voltage waveform slightly changed from sinusoidal to trapezoidal shapes. In the second scenario, the proposed generator was connected to the rectifier to form a DC system. The 45 W load has been considered in this DC scenario. Under the DC system test, 152.2 V output DC voltage, 0.1614 A current, and 24.976 W power have been monitored when the rotational speed of axial flux double permanent magnet generator was 847.9 rpm.
12
Zhou, Nan, and Guan Rong Wang. "Research about Subsynchronous Oscillation Caused by High-Voltage-Direct-Current." Advanced Materials Research 805-806 (September 2013): 920–25. http://dx.doi.org/10.4028/www.scientific.net/amr.805-806.920.
Повний текст джерелаАнотація:
Torsional interaction exists between HVDC converters and turbine-generators, and negative electrical damping provided by HVDC may cause subsynchronous oscillation (SSO) that can lead to turbine-generator shaft failure and electrical instability at oscillation frequencies lower than the fundamental system frequency. This paper makes a preliminary inquiry about the subsynchronous oscillation mechanism caused by the HVDC system, and puts forward Subsynchronous Damping Controller, and eventually makes a damping synchronous oscillation of the electrical Damping torque increment out of the generator electromagnetic torque to suppressing SSO.
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Msuya, R. A., R. R. Kainkwa, and M. I. Mgwatu. "Analysis of Power Efficiency of a Direct-Driven Locally Fabricated Permanent Magnet Ac Generator for Small-Scale Wind Power Applications in Tanzania." Tanzania Journal of Engineering and Technology 34, no. 2 (December 31, 2013): 84–93. http://dx.doi.org/10.52339/tjet.v34i2.461.
Повний текст джерелаАнотація:
The use of direct-driven permanent magnet alternating current (AC) generators offers the opportunity to reduced costs and increased system efficiency. This type of generator could be the best alternative for rural population whom are not connected to the national grid. To improve the design and efficiency of locally fabricated generators, it is imperative tocharacterize both their mechanical and electrical parameters. This paper presents the analysis of power efficiency of the synchronous permanent AC generator locally fabricated in Tanzania. In this case, load resistance and rotational speed are characterized using designed experiment. The output current and voltage of the generator were recorded simultaneously in each step change of load resistance and rotational speed. The output power and efficiency were then determined analytically. The results show that there is a linear relationship between voltage and rotational speed of the generator with and without load resistance. The results further indicated that out power is not linearly related to rotational speed. The generator•s power efficiency was found to be about 55% against both the output voltage and rotational speed.
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Amirullah, Amirullah, and Agus Kiswantono. "Power Quality Enhancement of Integration Photovoltaic Generator to Grid under Variable Solar Irradiance Level using MPPT-Fuzzy." International Journal of Electrical and Computer Engineering (IJECE) 6, no. 6 (December 1, 2016): 2629. http://dx.doi.org/10.11591/ijece.v6i6.12748.
Повний текст джерелаАнотація:
<p>The paper presents power quality enhancement on low voltage of three phase grid caused by PV generator integration under variabel solar irradiance level on constant temperature and load. MPPT Fuzzy helps to generate duty cycle to control DC/DC boost converter of PV generators. This model was expected to improve power quality due to unbalance voltage and current, low voltage and current harmonics, and low input power factor. There were eigth scenarios PV generator connected to three phase grid using MPPT Fuzzy and compared with MPPT P and O. The research results that application of two methods on different irradiance and PV generator integration level produces unbalanced voltage value stable at 0%. At the same conditions, the use of MPPT Fuzzy results unbalanced current was greater than MPPT P and O. On solar irradiance level fixed, the greater number of PV generator connected to three-phase grid, then value of average voltage and current harmonics (THD) will increases. At the level of solar radiation increases, average grid voltage and current THD also have increased. The average grid voltage and current THD was reduced after using MPPT Fuzzy. The application of MPPT Fuzzy was able to enhance profile of grid voltage and current THD due to integration of a number of PV generator to three phase grid corresponding with IEEE Standard 519-1992. MPPT Fuzzy was capable to improve input power factor better than MPPT P and O.</p>
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Amirullah, Amirullah, and Agus Kiswantono. "Power Quality Enhancement of Integration Photovoltaic Generator to Grid under Variable Solar Irradiance Level using MPPT-Fuzzy." International Journal of Electrical and Computer Engineering (IJECE) 6, no. 6 (December 1, 2016): 2629. http://dx.doi.org/10.11591/ijece.v6i6.pp2629-2642.
Повний текст джерелаАнотація:
<p>The paper presents power quality enhancement on low voltage of three phase grid caused by PV generator integration under variabel solar irradiance level on constant temperature and load. MPPT Fuzzy helps to generate duty cycle to control DC/DC boost converter of PV generators. This model was expected to improve power quality due to unbalance voltage and current, low voltage and current harmonics, and low input power factor. There were eigth scenarios PV generator connected to three phase grid using MPPT Fuzzy and compared with MPPT P and O. The research results that application of two methods on different irradiance and PV generator integration level produces unbalanced voltage value stable at 0%. At the same conditions, the use of MPPT Fuzzy results unbalanced current was greater than MPPT P and O. On solar irradiance level fixed, the greater number of PV generator connected to three-phase grid, then value of average voltage and current harmonics (THD) will increases. At the level of solar radiation increases, average grid voltage and current THD also have increased. The average grid voltage and current THD was reduced after using MPPT Fuzzy. The application of MPPT Fuzzy was able to enhance profile of grid voltage and current THD due to integration of a number of PV generator to three phase grid corresponding with IEEE Standard 519-1992. MPPT Fuzzy was capable to improve input power factor better than MPPT P and O.</p>
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Magalhães, Alana Da Silva, Pedro Henrique Franco Moraes, Alan Henrique Ferreira Silva, Pedro Henrique Garcia Gomes, Aylton José Alves, and Wesley Pacheco Calixto. "Reconditioning in synchronous operation with one parallel induction generator." Transactions on Environment and Electrical Engineering 1, no. 4 (November 27, 2016): 66. http://dx.doi.org/10.22149/teee.v1i4.75.
Повний текст джерелаАнотація:
The purpose of this paper is to compare mathematical modeling and practical bench in order to validate the electrical interactions between an induction generator and a synchronous generator. Two generators was connected to a common bus in steady state, subject to non-linear load. The results comparing modeling and bench tests show that the induction generator besides the active power increasing, has a better way for harmonic currents flowing in common bus. It was concluded that the induction generator repowering and attenuates current harmonic components present at the connection point, improving the network voltage profile.
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Maurath, D., C. Peters, T. Hehn, M. Ortmanns, and Y. Manoli. "Highly efficient integrated rectifier and voltage boosting circuits for energy harvesting applications." Advances in Radio Science 6 (May 26, 2008): 219–25. http://dx.doi.org/10.5194/ars-6-219-2008.
Повний текст джерелаАнотація:
Abstract. This paper presents novel circuit concepts for integrated rectifiers and voltage converting interfaces for energy harvesting micro-generators. In the context of energy harvesting, usually only small voltages are supplied by vibration-driven generators. Therefore, rectification with minimum voltage losses and low reverse currents is an important issue. This is realized by novel integrated rectifiers which were fabricated and are presented in this article. Additionally, there is a crucial need for dynamic load adaptation as well as voltage up-conversion. A circuit concept is presented, which is able to obtain both requirements. This generator interface adapts its input impedance for an optimal energy transfer efficiency. Furthermore, this generator interface provides implicit voltage up-conversion, whereas the generator output energy is stored on a buffer, which is connected to the output of the voltage converting interface. As simulations express, this fully integrated converter is able to boost ac-voltages greater than |0.35 V| to an output dc-voltage of 2.0 V–2.5 V. Thereby, high harvesting efficiencies above 80% are possible within the entire operational range.
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Sarwono, Sarwono, Ridho Hantoro, Fernando Parsaulian Panjaitan, Erna Septianingrum, Nuril Hidayati, and Lutfan Sinatra. "Experimental Study of Hydrokinetic Power Generation System Integration – Straight Blade Cascaded (SBC) Vertical Axis Darrieus Turbine." E3S Web of Conferences 190 (2020): 00038. http://dx.doi.org/10.1051/e3sconf/202019000038.
Повний текст джерелаАнотація:
The utilization of hydrokinetic energy as renewable energy is an effort in meeting the increasing demand for energy. The development of vertical axis hydrokinetic turbine straight blade cascaded (VAHT-SBC) at previous research has successfully extract energy with high-performance coefficients. However, the developed VAHT-SBC has not yet been integrated with generators as a power system generator. This research was conducted experimentally on an open channel, including an integrated system designed using VAHT-SBC and Permanent Magnet Synchronous Generator (PMSG) with a belt-pulley mechanism. The result shows the proportional relation of generator rotational speed to voltage and frequency. On the contrary, the generated voltage experience drop due to the loading in the integration system. The value of the voltage and frequency of inverter is not affected by rotational speed and load. The resulting inverter voltage has a value of 230 V and a frequency of 56 Hz. The installation of the integration system on hydrokinetic turbines prototype with the current velocity of 0.82 m s–1 and 0.92 m s–1 could produce 50 W of power.
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Pan, Xue Hai. "Constant Voltage Analysis of Permanent Magnet Generator." Applied Mechanics and Materials 63-64 (June 2011): 970–73. http://dx.doi.org/10.4028/www.scientific.net/amm.63-64.970.
Повний текст джерелаАнотація:
This paper discusses and analysis the constant voltage of vehicle applied permanent magnet generator. The permanent magnet can produce magnetic field in an air gap with no excitation winding and no dissipation of electric power, when the rotor turns, the magnet field turns, the generator generates electricity, with the permanent magnet material of high remnant magnetic induction and the optimized design of the generator, the output voltage is improved when the engine at low speed. We develop a single-phase double half-wave electric regulator is to ensure the stability of the output voltage and can direct output direct current.
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Orihara, Dai, Hisao Taoka, Hiroshi Kikusato, Jun Hashimoto, Kenji Otani, Takahiro Takamatsu, Takashi Oozeki, et al. "Internal Induced Voltage Modification for Current Limitation in Virtual Synchronous Machine." Energies 15, no. 3 (January 26, 2022): 901. http://dx.doi.org/10.3390/en15030901.
Повний текст джерелаАнотація:
Virtual inertia control is a methodology to make inverter-based resources (IBR) behave like a synchronous machine. However, an IBR cannot fully emulate the response of synchronous machine because of its low-current capacity. When the inertial response of an IBR is affected by the current limitation, the synchronization of the synchronous machine simulated virtually inside the IBR controller with the other synchronous generators in the grid is affected, which may cause step-out of the simulated generator. We propose a methodology which can keep the synchronization by modifying internal induced voltage of the simulated generator to follow the system voltage change. The proposal is validated by the simulation using a nine-bus transmission system model including two synchronous generators and a large-scale IBR. The result of the generator trip simulation shows that the proposed method suppresses the phase angle variation while the current is limited, and avoids the instability regarding the synchronism. Furthermore, the impact of the current limitation on frequency stability is also evaluated through the simulation study and it is found that as the amount of output suppression increases, the frequency nadir falls, but the rate-of-change of frequency is hardly affected.
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Kotin, D. A., and I. А. Ivanov. "Using of a single-phase synchronous multi-winding generator with permanent magnets for the power supply of an autonomous consumer." Power engineering: research, equipment, technology 24, no. 1 (May 24, 2022): 29–38. http://dx.doi.org/10.30724/1998-9903-2022-24-1-29-38.
Повний текст джерелаАнотація:
THE PURPOSE. Consider the existing ways of using electromechanical converters for power supply of an autonomous consumer. Conduct a comparative analysis of electromechanical converters, scenarios and conditions for their use in the power supply of an autonomous consumer. To develop a proposal to eliminate the shortcomings in existing models of synchronous generators in order to increase their controllability. To develop a mathematical description of a synchronous generator with magnetoelectric excitation from permanent magnets of a single-phase type with a simplified design as a universal example of the functioning of the entire proposed line of synchronous generators. Carry out mathematical modeling of the generator proposed for consideration in order to confirm the proposed method of regulating the generated parameters, such as current and voltage, without the need to change the generator shaft rotation speed.METHODS. When solving the problem, the method of describing an electric machine in a dq-coordinate system using a multi-winding description of the machine was used; to confirm the proposed control method, mathematical modeling with the SimInTech environment was used.RESULTS. The article describes the relevance of the topic, considers the features of the operation of various electromechanical converters for power supply of an autonomous consumer, indicates the conditions for the use of one type or another of the architects of the power supply system in conjunction with electromechanical converters. A line of synchronous generators with magnetoelectric excitation is proposed in order to improve their controllability, namely, the ability to regulate the output generated parameters.CONCLUSION. Using of the proposed synchronous generators with excitation from permanent magnets will allow for additional regulation of the generated parameters, thereby allowing either completely or partially to exclude additional semiconductor converting equipment, thereby reducing losses during the conversion of electrical energy. Moreover, it is possible to regulate the generated current and voltage discretely by two times increasing one of these values, this method of regulation depends on the design of the generator.
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Pratiwi, Nurul Dyah, and Isdiyato Isdiyato. "Analisis Ketidakstabilan Tegangan dan Frekuensi Pada Pembangkit Listrik Tenaga Mikrohidro Soko Kembang." Energi & Kelistrikan 11, no. 2 (December 17, 2019): 129–37. http://dx.doi.org/10.33322/energi.v11i2.864.
Повний текст джерелаАнотація:
Microhydro power plant (MPP) is a small-scale power plant that uses water energy. The process of energy change occurs in a device called a synchronous generator. when the synchronous generator is given an arbitrary load, then the voltage will change. These results cause voltage and frequency instability. This research was conducted to analyze the voltage and frequency instability in MPP. The research method used in this research is descriptive quantitative approach in the village of Soko Kembang, Petungkriyono District, Pekalongan Regency, Central Java. This study provides an overview and explanation of the problems regarding the voltage and frequency instability of Micro Hydro Power Plants. The results of this study are the highest and lowest voltage / frequency instability values, namely 235 volts / 51 Hz and 160 volts / 44 Hz, due to the influence of changes in load current, which can affect the rotational speed of the generator changes, resulting in unstable voltage and frequency generated by the generator, the rotational speed of the generator changes, resulting in unstable voltage and frequency generated by the generator. The solution is add water power to rotate the shaft of the turbine and generator to be tighter, so that it can reduce the value of the decrease in electric power by losses to the turbine and generator. Large electric power can increase voltage and frequency without having to adjust the load, and the need for improvement of the ELC system in order to get a more effective value of voltage and frequency stability.
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Damij, Raad Lafta. "Development of mechanical coupling and exciter system in synchronous generators." Eastern-European Journal of Enterprise Technologies 6, no. 8 (114) (December 24, 2021): 34–40. http://dx.doi.org/10.15587/1729-4061.2021.246619.
Повний текст джерелаАнотація:
Power is generated in a variety of ways, including renewable energy, nuclear power, and burning of fossil fuels. The majority of our power is currently generated by burning fossil fuels, mostly natural gas and coal, to spin turbines attached to an electromagnetic generator. The main advantage of AC generation is that the voltage levels can be altered up and down with transformers, allowing electricity to be sent across long distances to the loads that demand it. The excitation system demand for large synchronous generators with a few hundred-megawatt ratings becomes very enormous. The challenge of transmitting such a big amount of power through high-speed sliding contacts becomes daunting. Mechanical coupling with exciter for synchronous generators is essential to mitigate such problems as the corrected output is linked directly to the field winding. This paper aims to develop a simulation of a 3-phase diesel engine-based 2 MVA/400 V synchronous generator with mechanical coupling and an exciter system. The developed simulation of the synchronous machine is set to deliver 25 % of its rating value (500 kW) till the time of 3 sec. Then, additional power of 1 MW is switched at t=3 sec via a 3-phase circuit breaker. The dynamic response of field current and field voltage of the simulation shows reasonable step performance as the steady-state time is less than 3 sec. The control of the excitation system allows the generator to maintain voltage, control reactive power flow, and assist in maintaining power system stability. The simulation was accurate when measuring the voltage and current under these changes. This analysis can help to investigate further integration with renewable energy sources.
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Eriksson, Sandra. "Inherent Difference in Saliency for Generators with Different PM Materials." Journal of Renewable Energy 2014 (2014): 1–5. http://dx.doi.org/10.1155/2014/567896.
Повний текст джерелаАнотація:
The inherent differences between salient and nonsalient electrical machines are evaluated for two permanent magnet generators with different configurations. The neodymium based (NdFeB) permanent magnets (PMs) in a generator are substituted with ferrite magnets and the characteristics of the NdFeB generator and the ferrite generator are compared through FEM simulations. The NdFeB generator is a nonsalient generator, whereas the ferrite machine is a salient-pole generator, with small saliency. The two generators have almost identical properties at rated load operation. However, at overload the behaviour differs between the two generators. The salient-pole, ferrite generator has lower maximum torque than the NdFeB generator and a larger voltage drop at high current. It is concluded that, for applications where overload capability is important, saliency must be considered and the generator design adapted according to the behaviour at overload operation. Furthermore, if the maximum torque is the design criteria, additional PM mass will be required for the salient-pole machine.
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Mathew, M., B. L. Hart, K. Hayatleh, and F. J. Lidgey. "Low-voltage, wide-range, current-controlled DC current generator." International Journal of Electronics 98, no. 8 (August 2011): 1123–27. http://dx.doi.org/10.1080/00207217.2011.582422.
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Lv, Xiang Yu, Zheng Jun Bi, Tian Dong, Xue Fei Chang, and Xiao Juan Han. "Leading Phase Operation and Voltage Regulation of Synchronous Generators." Applied Mechanics and Materials 380-384 (August 2013): 3003–7. http://dx.doi.org/10.4028/www.scientific.net/amm.380-384.3003.
Повний текст джерелаАнотація:
The leading phase operation of generator is an effective method to reduce voltage of the key point which is much high in valley load period. This paper reviews the history on leading phase of generator and introduces the current situation on stable monitoring of the generators leading phase capacity. Meanwhile, this paper proposes main restricted conditions of generator leading phase and analyzed in details. At last some experiments are performed for part generating sets with a capacity of 100MW above in one province and obtained the experiment results on voltage regulation through leading phase of synchronous generating sets.
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Carotenuto, Gianfranco. "A New Method to Detect Zeolite Breath Sensor Response Based on Low-Power Square-Wave Sources." European Journal of Engineering Research and Science 4, no. 10 (October 28, 2019): 152–54. http://dx.doi.org/10.24018/ejers.2019.4.10.1594.
Повний текст джерелаАнотація:
Low-power A.C. generators of square-wave or sinusoidal signals can be used in combination with impedimetric sensors to detect stimuli on the basis of the voltage drop taking place at the sensor electrodes. When a.c. generators with a power of only a few µ-Watts are used, this approach becomes extremely sensitive. A very low-power generator is the LCD back panel driving signal, which has a flipping polarity with a voltage of 3-5Vpp, depending on the generator model. This type of square-wave generator is contained in many low-cost handheld digital multimeters, and it is used as signal tracer to test, for example, low-frequency amplifiers. As an example, this method has been used to acquire a human breath rate pattern, by using a zeolite-based water sensor. If the generator I-V characteristics has been measured, the achieved breath pattern can be converted from a voltage drop vs. time graph to an impedance or current intensity vs. time graph.
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Carotenuto, Gianfranco. "New Method to Detect Zeolite Breath Sensor Response Based on Low-Power Square-Wave Sources." European Journal of Engineering and Technology Research 4, no. 10 (October 28, 2019): 152–54. http://dx.doi.org/10.24018/ejeng.2019.4.10.1594.
Повний текст джерелаАнотація:
Low-power A.C. generators of square-wave or sinusoidal signals can be used in combination with impedimetric sensors to detect stimuli on the basis of the voltage drop taking place at the sensor electrodes. When a.c. generators with a power of only a few µ-Watts are used, this approach becomes extremely sensitive. A very low-power generator is the LCD back panel driving signal, which has a flipping polarity with a voltage of 3-5Vpp, depending on the generator model. This type of square-wave generator is contained in many low-cost handheld digital multimeters, and it is used as signal tracer to test, for example, low-frequency amplifiers. As an example, this method has been used to acquire a human breath rate pattern, by using a zeolite-based water sensor. If the generator I-V characteristics has been measured, the achieved breath pattern can be converted from a voltage drop vs. time graph to an impedance or current intensity vs. time graph.
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Flaxer, E. "High-voltage pulse modulated radio frequency generator for dielectric barrier discharge combined with ultra-fast high power pulse generator." Journal of Instrumentation 16, no. 10 (October 1, 2021): P10003. http://dx.doi.org/10.1088/1748-0221/16/10/p10003.
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Abstract Dielectric barrier discharge is the electrical discharge between two electrodes separated by an insulating dielectric barrier. The discharge process typically uses a high-voltage alternating current in the range of several kilohertz to several gigahertz. A high-frequency and high-power pulse generator is required to drive the discharge process through the capacitance load. There are two main techniques to implement this type of generator: the forced and resonant modes. This work demonstrates the implementation of a programmable digital circuit based on a digital signal controller and a full H-bridge that combines the two topologies and can be used as a controller for dielectric barrier discharge with varying capacitance and structure. We integrated an ultra-fast, high-resolution, and high-power pulse generator into a radio frequency generator to drive high-pressure, supersonic, pulsed valves. The excitation based on our DBD and the combined generator produces cold plasma beams. The controller generates discharge voltages of up to 5 kV, in pulses of 10 to 50 μs wide, at rates of up to 1 kHz, while the discharge frequency ranges are from 1 to 3 MHz under a capacitive load of 100 pF. The power generator applies a current pulse of up to 20 A and voltage of up to 150 V.
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Wijono, Wijono, Zainul Abidin, Waru Djuriatno, Eka Maulana, and Nola Ribath. "Design of 4-stage Marx generator using gas discharge tube." Bulletin of Electrical Engineering and Informatics 10, no. 1 (February 1, 2021): 55–61. http://dx.doi.org/10.11591/eei.v10i1.1949.
Повний текст джерелаАнотація:
In this paper, a Marx generator voltage multiplier as an impulse generator made of multi-stage resistors and capacitors to generate a high voltage is proposed. In order to generate a high voltage pulse, a number of capacitors are connected in parallel to charge up during on time and then in series to generate higher voltage during off period. In this research, a 6kV Marx generator voltage multiplier is designed using gas discharge tube (GDT) as an electronic switch to breakdown voltage. The Marx generator circuit is designed to charge the storage capacitor for high impulse voltage and current generator applications. According to IEC 61000-4-5 class 4 standards, the storage capacitor must be charged up to 4 kV. The results show that the proposed Marx generator can produce voltages up to 6.8 kV. However, the storage capacitor could be charged up to 1 kV, instead of 4 kV in the standard. That is because the output impulse voltage has narrow time period.
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Peresada, S., S. Bozhko, S. Kovbasa, and Ye Nikonenko. "ROBUST DIRECT FIELD ORIENTED CONTROL OF INDUCTION GENERATOR." Tekhnichna Elektrodynamika 2021, no. 4 (June 17, 2021): 14–24. http://dx.doi.org/10.15407/techned2021.04.014.
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A novel and robust field oriented vector control method for standalone induction generators (IG) is presented. The proposed controller exploits the concept of direct field orientation and provides asymptotic rotor flux modulus and DC-link voltage regulations when a DC-load is constant or slowly varying. Flux subsystem, designed using Lyapunov’s second method, has, in contrast to standard structures, closed loop properties and therefore is robust with respect to rotor resistance variations. A decomposition approach on the base of the two-time scale separation of the voltage and torque current dynamics is used for design of the voltage subsystem. The feedback linearizing voltage controller is designed using a steady state IG power balance equation. The resulting quasi-linear dynamics of the voltage control loop allows use of simple controllers tuning procedure and provides an improved dynamic performance for variable speed and flux operation. Results of a comparative experimental study with standard indirect field oriented control are presented. In contrast to existing solutions, the designed controller provides system performances stabilization when speed and flux are varying. It is experimentally shown that a robust field oriented controller ensures robust flux regulation and robust stabilization of the torque current dynamics leading to improved energy efficiency of the electromechanical conversion process. The proposed controller is suitable for energy generation systems with variable speed operation. References 18, figures 8.
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Cheng, Siwei, and Thomas Habetler. "Using Only the DC Current Information to Detect Stator Turn Faults in Automotive Claw-Pole Generators." Industrial Electronics, IEEE Transactions on 60, no. 8 (April 2013): 3462–71. http://dx.doi.org/10.1109/tie.2012.2205353.
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The stator turn-to-turn short circuit is an important type of fault in automotive claw-pole generators. In a typical vehicle electric power system, the built-in rectifier of the generator makes it difficult to access the ac current or voltage information, rendering conventional sequence-component-based fault-detection methods useless. To detect such fault using only the available sensor information, a dynamic model of the claw-pole generator with stator turn faults is derived in this paper to analyze how the fault would interact with the connected battery and the static full-bridge rectifier and how it would affect the generator's output voltage and current. It is found that, in the rectified generator output current, the harmonic at one-third of the rectifier ripple frequency is a robust signature of the stator turn fault. The performance of the stator turn-fault detector is demonstrated by extensive experimental results. Although the fault detector is originally proposed for claw-pole generators, it is also applicable to most polyphase ac generators with a dc-link rectifier.
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Jeon, Hyeonmin, and Jongsu Kim. "Application of Reference Voltage Control Method of the Generator Using a Neural Network in Variable Speed Synchronous Generation System of DC Distribution for Ships." Journal of Marine Science and Engineering 8, no. 10 (October 15, 2020): 802. http://dx.doi.org/10.3390/jmse8100802.
Повний текст джерелаАнотація:
In the case of DC power distribution-based variable speed engine synchronous generators, if the output reference voltage is kept constant regardless of the generator engine operating speed, it may cause damage to the internal device and windings of the generator due to over-flux or over-excitation. The purpose of this study is to adjust the generator reference voltage according to the engine speed change in the DC distribution system with the variable speed engine synchronous generator. A method of controlling the generator reference voltage according to the speed was applied by adjusting the value of the variable resistance input to the external terminal of the automatic voltage regulator using a neural network controller. The learning data of the neural network was measured through an experiment, and the input pattern was set as the rotational speed of the generator engine, and the output pattern was set as the input current of the potentiometer. Using the measured input/output pattern of the neural network, the error backpropagation learning algorithm was applied to derive the optimum connection weight to be applied to the controller. For the test, the variable speed operation range of the generator engine was set to 1100–1800 rpm, and the input current value of the potentiometer according to the speed increase or decrease within the operation range and the output of the voltage output from the actual generator were checked. As a result of neural network control, it was possible to confirm the result that the input current value of the potentiometer accurately reached the target value 4–20 mA at the point where the initial speed change occurred. It was confirmed that the reference voltage was also normally output in the target range of 250–440 V.
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Manap, Muhammad Abdul, and Al Fikri. "Rancang Bangun Pembangkit Listrik Alternatif Menggunakan Termoelektrik dengan Memanfaatkan pada Tungku Pemanas." Journal of Electrical Power Control and Automation (JEPCA) 3, no. 2 (December 25, 2020): 53. http://dx.doi.org/10.33087/jepca.v3i2.41.
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his study aims to design an alternative power generator using a thermoelectric generator (TEG) by utilizing a heating furnace, using two thermoelectric generators (TEG) connected in series. Thermoelectrics that take advantage of temperature differences can produce voltages that correspond to the seebeck effect. The alternative power generator that has been designed consist of a thermoelectric, boost converter, and a 5 Watt DC lamp load. The test was carried out using a Boost Converter and using a 5 Watt DC lamp load for 20 minutes. The results of the research using the Boost Converter produce a voltage of 42.8 V with a temperature difference of 90°C, while using a 5 Watt DC lamp load produces a voltage of 8.81 V with a temperature difference of 82°C and the resulting current is 0.6 A, the resulting power 4.84W.
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Rochman, Sagita, and Mochamad Taufiq Irvan Efendy. "Arduino Based Design of Horizontal Wind Power Generator for Coastal Road Lighting." BEST : Journal of Applied Electrical, Science, & Technology 3, no. 1 (March 15, 2021): 30–33. http://dx.doi.org/10.36456/best.vol3.no1.3540.
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Increasing energy demand, depleting fossil fuel reserves, and environmental concerns have put renewable energy sources in the spotlight in Indonesia. Wind energy in particular, which has received a lot of attention because it is inexhaustible and friendly to the environment. The main problem of the two generating systems is not continuously available. Wind turbines are the main medium used to convert wind energy into electrical energy. A good wind turbine design will determine the performance of a wind power plant (PLTB). This tool is to control the electric power generated from the wind generator, the electric power generated from the generator will be measured the current and voltage. The way the tool works when the generator wheel rotates, the generator will produce electrical power which has been connected to the charger controller before the electric power is stored in the battery. The use of electric power from the battery will be converted using an inverter to convert the DC current to AC. This research was conducted on wind turbine generators in the use of coastal street lighting as objects to generate electric power in order to reduce the need for PLN electricity. This research was conducted on wind turbine generators in the use of coastal street lighting as objects to generate electric power in order to reduce the need for PLN electricity. The generator will generate electrical power which has been connected to the charger controller before the electric power is stored in the battery. The use of electric power from the battery will be converted using an inverter to convert the DC current to AC. This research was conducted on wind turbine generators in the use of coastal street lighting as objects to generate electric power in order to reduce the need for PLN electricity
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Yosua Alvin Adi Soetrisno, Bambang Winardi, and Enda Wista Sinuraya. "Generator protection system with reverse power relay on 1000 KVA 'Cummins' diesel generator at Cepu Human Resources Development Center." World Journal of Advanced Research and Reviews 14, no. 1 (April 30, 2022): 377–84. http://dx.doi.org/10.30574/wjarr.2022.14.1.0343.
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Each generator is designed to create a certain amount of electricity. However, there are situations when the generator cannot handle the current load. The solution is to employ two or more generators to produce as much power as the number of generators operating simultaneously or synchronizing (parallel generator). Several parameters must be configured throughout the synchronization process, including the phase sequence, voltage, frequency, and phase angle, which must be the same. An operation failure can occur if one of the prerequisites is not fulfilled, resulting in reverse power. The motoring condition is a condition that occurs when the primary mover of a parallel generator fails. A reverse power protection mechanism is required to prevent this motoring. When one of the generator's prime movers fails or the operation fails, the voltage and load will drop. The other generator then feeds another generator. The reverse power relay instructs the generator's main circuit breaker to open the circuit so that no additional equipment is harmed. This research aims to investigate and comprehend the reverse power relay protection system's use.
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Yosua Alvin Adi Soetrisno, Bambang Winardi, and Enda Wista Sinuraya. "Generator protection system with reverse power relay on 1000 KVA 'Cummins' diesel generator at Cepu Human Resources Development Center." World Journal of Advanced Research and Reviews 14, no. 1 (April 30, 2022): 377–84. http://dx.doi.org/10.30574/wjarr.2022.14.1.0343.
Повний текст джерелаАнотація:
Each generator is designed to create a certain amount of electricity. However, there are situations when the generator cannot handle the current load. The solution is to employ two or more generators to produce as much power as the number of generators operating simultaneously or synchronizing (parallel generator). Several parameters must be configured throughout the synchronization process, including the phase sequence, voltage, frequency, and phase angle, which must be the same. An operation failure can occur if one of the prerequisites is not fulfilled, resulting in reverse power. The motoring condition is a condition that occurs when the primary mover of a parallel generator fails. A reverse power protection mechanism is required to prevent this motoring. When one of the generator's prime movers fails or the operation fails, the voltage and load will drop. The other generator then feeds another generator. The reverse power relay instructs the generator's main circuit breaker to open the circuit so that no additional equipment is harmed. This research aims to investigate and comprehend the reverse power relay protection system's use.
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Touati, Zeineb, Manuel Pereira, Rui Esteves Araújo, and Adel Khedher. "Improvement of Steady State Performance of Voltage Control in Switched Reluctance Generator: Experimental Validation." Machines 10, no. 2 (January 28, 2022): 103. http://dx.doi.org/10.3390/machines10020103.
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This paper presents a voltage control approach to a Switched Reluctance Generator (SRG) using a Proportional Integral (PI) controller. The principle of operation is described and the considerations in the design of controller are discussed. A current loop transfer function of an SRG with power converter has been systematically derived in order to obtain a small-signal model for the generator. The generated voltage is controlled by manipulation of the setpoint of the current control of the generator. The entire voltage loop controller and current control have been simulated and tested with a 250 W SRG prototype. The control law of the control system was implemented on a digital signal processor (TMS320F28379D). To verify the feasibility of the proposed voltage control, the performances are evaluated by numerical simulations and experimental tests with an 8/6 SRG for different rotational speeds and resistive loads. Experimental results demonstrate that the DC output voltage from SRG can be controlled well using a simple linear controller.
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Ali, Ahmed J., Mohammed Y. Suliman, Laith A. Khalaf, and Nashwan S. Sultan. "Performance investigation of stand-alone induction generator based on STATCOM for wind power application." International Journal of Electrical and Computer Engineering (IJECE) 10, no. 6 (December 1, 2020): 5570. http://dx.doi.org/10.11591/ijece.v10i6.pp5570-5578.
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Self-Excited induction generators (SEIG) display a low voltage and frequency regulation due to variable applied load and input rotation speed. Current work presents a simulation and performance analysis of a three-phase wind-driven, SEIG connect to a three-phase load. In addition, an investigation of the dynamic operation of the induction generator from starting steady state until no-load operation. It is assumed that the input mechanical power is constant where the rotor of the SEIG rotates at a constant speed. The value of the excitation capacitance which is necessary to the operation of the induction generator also computed to ensure a smooth and self-excitation starting. The output voltage of the generator is adjusted by varying the reactive power injected by STATCOM. A 3-phase IGBT voltage source inverter with a fuel cell input supply is connected as STATCOM which is used to compensate for the reduction in the supply voltage and its frequency due to variation occurred in the applied loads. This work includes introducing a neuro-fuzzyy logic controller to enhance the performance of the SEIG by regulation the generated voltage and frequency The dynamic model of SEIG with STATCOM and loads are implemented using MATLAB/SIMULINK
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Mel’kanovich, A. F., and S. I. Konovalov. "Operation of a piezoelectric transducer in a voltage generator and current generator circuits." Russian Journal of Nondestructive Testing 49, no. 12 (December 2013): 735–40. http://dx.doi.org/10.1134/s106183091312005x.
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Ling, Yu. "Study of the influence of different feed-forward voltage compensation terms on the fault ride-through capability of doubly fed induction generator wind turbines." Wind Engineering 41, no. 3 (March 31, 2017): 147–59. http://dx.doi.org/10.1177/0309524x17699922.
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As a result of the increasing wind power penetration into power systems, the wind farms, especially with doubly fed induction generators, are required to have the fault ride-through capability. The article presents a study on the influence of three different feed-forward voltage compensation terms in rotor current control on the fault ride-through capability of doubly fed induction generator wind turbines. The study focuses on the enhancement of fault ride-through capability for doubly fed induction generator wind turbines by adopting different feed-forward voltage compensation terms in rotor current control. The three control strategies, which are developed based on different feed-forward voltage compensation terms, are evaluated through simulations of doubly fed induction generator wind turbines under both normal conditions and grid voltage fault conditions. The three control methods present different performances. Under normal conditions, the control system 1 presents better performance. However, the control system 3 presents better performance when the doubly fed induction generator wind turbine is subjected to a voltage fault. In order not to have the influence on the performance under normal operating conditions, the added feed-forward voltage compensation terms in the control system 3, which acted as a fault control mode, are enabled only when a voltage fault occurs in the grid.
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Gębura, Andrzej, and Mirosław Zieja. "The Idea to Synchronize Measuring Paths for Two Different Current Generators Operated as Position-Voltage Converters." Research Works of Air Force Institute of Technology 38, no. 1 (August 1, 2016): 127–34. http://dx.doi.org/10.1515/afit-2016-0012.
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Abstract The study deals with the issue how to apply two different types of current generators at the same time, namely a three-phase AC generator and a DC generator of commutator type. What is more interesting, the two generators would be able to collaborate both during the phase of electromechanical sampling and the phase of electronic sampling. It will enable structural improvement of sensitivity and resolution parameters and shall open new opportunities to investigate new types if mechanical phenomena (that have not been already tracked by means of the FAM-C and FDM-A methods), such as torsion of torque transmission shafts.
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Rochman, Sagita, and Budi Prijo Sembodo. "RANCANG BANGUN GENERATOR TURBIN ANGIN PUTARAN RENDAH SEBAGAI PEMBANGKIT ENERGI LISTRIK ALTERNATIF DI DAERAH PESISIR." WAHANA 70, no. 1 (June 1, 2018): 25–34. http://dx.doi.org/10.36456/wahana.v70i1.1564.
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Axial Flux Permanent Magnet Generator (AFPMG) of wind turbine generator has been successfully designed and fabricated. The generator has been designed for wind speed in the range of 2-6 m/s and low rotation. The main purpose of study was to design and analyze wind turbine generator with the low speed of wind that can be generated electric power for household. The results showed that the prototype of wind turbine can be generated voltage around 22.5 - 157.1 V with the rotation of the rotor shaft at 150 - 1000 rpm. Meanwhile, the prototype can be generated output power of 98.5 Watt shaft rotation of 1000 rpm when its connected to load. Both current and voltage can be achieved around 151.4 V and 0.651 A, respectively.The prototype was then conneted with DC to DC converter and DC to AC converter to generate output power of 500 W.
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Kobayashi, Hiromichi, Natsuko Kuwako, Yoshihiro Okuno, and Shigeharu Kabashima. "Voltage-current characteristics of subsonic disk CCMHD generator." Electrical Engineering in Japan 130, no. 4 (March 2000): 58–65. http://dx.doi.org/10.1002/(sici)1520-6416(200003)130:4<58::aid-eej7>3.0.co;2-f.
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Kobayashi, Hiromichi, Natsuko Kuwako, Yoshihiro Okuno, and Shigeharu Kabashima. "Voltage - Current Characteristics of Subsonic Disk CCMHD Generator." IEEJ Transactions on Power and Energy 118, no. 3 (1998): 302–7. http://dx.doi.org/10.1541/ieejpes1990.118.3_302.
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Sujono, Augustinus, Feri Adriyanto, Hari Maghfiroh, Joko Slamet Saputro, and Agus Ramelan. "Variable Speed DC Generator Voltage Control using a Multistage Comparator." Journal of Electrical, Electronic, Information, and Communication Technology 3, no. 1 (April 30, 2021): 18. http://dx.doi.org/10.20961/jeeict.3.1.50430.
Повний текст джерелаАнотація:
DC generator with variable rotation will produce uncontrolled voltage, causing problems in its utilization. In this study, it is proposed to develop a voltage control on the generator, in order to produce a fairly controllable and reliable voltage, with an analog circuit using a multistage comparator. Control of the generator output voltage is carried out by adjusting the field current from a separate voltage source which is forwarded to the resistance which is regulated based on the generator output voltage level with a multilevel comparison system. The results obtained are the output voltage ranges from 26 to 30 Volts and the output current ranges from 3 to 20 Amperes. This provides operational safety for the generator and battery. This technology can be used in dc generator systems in automotive engines, windmills, and other power plants.
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Syafriyudin, Syafriyudin, and M. Suyanto. "Analisis Perencanaan Jarak Celah Udara Pada Generator Axial." Journal of Electrical Power Control and Automation (JEPCA) 4, no. 1 (June 21, 2021): 22. http://dx.doi.org/10.33087/jepca.v4i1.48.
Повний текст джерелаАнотація:
The generator uses a permanent magnet so it does not require initial excitation to generate a voltage. The generator design is axial flux type, uses ceramic type permanent magnet (NdFeB), uses two flanking stator rotors. For electricity use, the AC voltage is changed to DC voltage using a rectifier for charging the accumulator. The air gap in the axial generator is the distance between the rotor and the stator. The air gap is also a place for the transfer of the magnetic field through the coil on the stator to produce a magnetic flux value that affects the induced voltage in the coil. The faster the rotation, the greater the voltage generated. This axial generator that has been designed can produce a frequency of ± 50 Hz, an effective voltage of ± 22 V when the air gap is 2 mm, the frequency measurement has an error of 10-20 Hz and an error percentage of 5-10%, with the results of measuring the induced current that has a large the same voltage.
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Lan, Yu Dan, and Li Ming He. "Electrical Characteristics Investigation of Transient Plasma Ignition." Applied Mechanics and Materials 110-116 (October 2011): 503–7. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.503.
Повний текст джерелаАнотація:
A pseudo-spark based high repetition pulse generator is used, and a rapid charger (3μF) is used for repetitive discharge, and the frequency of typical discharge is 10 kHz. The pulse generator can provide pulse with duration of 1~2μs, which can be generated at 10~100 kHz maximum repetition rate in burst mode, with amplitudes up to 140 kV and 7 J of energy per ignition pulse. This paper studies the changing laws of voltage and current in TPI under different electrodes and discharge voltages. The result indicates that the use of screw thread electrode can increase the discharge times of TPI, reduce applied voltage without reducing the peak burst power. With the same time, TPI can raise the pulse energy and reduce pulse time by increasing voltage.
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Perdana, Iqbal Nusya. "Replacement of several single function generator protection relay at Badak LNG." MATEC Web of Conferences 277 (2019): 03008. http://dx.doi.org/10.1051/matecconf/201927703008.
Повний текст джерелаАнотація:
Badak LNG is a company that operates the largest LNG Plant in Indonesia with maximum production capacity of 22.5 MTPA. The company operates twelve (12) steam turbine generators and one gas turbine generator and one diesel engine generator to supply electricity for process, utility, storage, loading and plant support facility areas, which constitutes the criticality of power generator equipment to keep the reliability of production process. Generator protection relay is one of the equipment that monitors and protects the generator from fault resulting from either internal or external disturbance, preventing the generator from serious damages. Before 2015, Badak LNG used single function relays to protect the generators. The generators are protected by stator differential protection (87), current unbalance (46), loss of excitation (40), reverse power (32), time overcurrent with voltage restraint (51V), and time overcurrent ground (51G). These single function relays wield more disadvantages compared to the newer technology held by the digital relays. Since 2015, Badak LNG have started to replace the single function generator protection relays with the digital type ones.
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Chumack, Vadim, Volodymyr Bazenov, Oksana Tymoshchuk, Mykhailo Kovalenko, Serhii Tsyvinskyi, Iryna Kovalenko, and Ihor Tkachuk. "Voltage stabilization of a controlled autonomous magnetoelectric generator with a magnetic shunt and permanent magnet excitation." Eastern-European Journal of Enterprise Technologies 6, no. 5 (114) (December 21, 2021): 56–62. http://dx.doi.org/10.15587/1729-4061.2021.246601.
Повний текст джерелаАнотація:
The paper presents the results of testing and research of the characteristics of a controlled autonomous magnetoelectric synchronous generator with a magnetic shunt. Structurally, the studied generator is a modified asynchronous machine in which the rotor is made with permanent magnets and an additional system in the form of a magnetic shunt. By adjusting the winding current of the magnetic shunt, the output voltage of the generator is regulated. The following characteristics were investigated: the no-load characteristic during operation with permanent magnets and when the winding current of the magnetic shunt changes with forward and reverse polarity. Also, the external characteristic for active and active-inductive loads; the control characteristic when the load current changes at a constant generator voltage. Analysis of the obtained characteristics makes it possible to determine the limits of regulation of the external characteristic, which is ≈40 % relative to the main magnetic flux. The obtained regulation depth allows maintaining the stability of the external characteristic for power factors not exceeding 0.9, which is the usual passport value for autonomous power plants based on synchronous generators. Comparison of the data of research conducted on the experimental setup shows sufficient convergence for engineering and practical tasks. The maximum quantitative difference is 9.3 %, which suggests the adequacy of the previously developed mathematical model. The control characteristic, constructed experimentally at constant generator voltage, is the control law of the magnetic shunt winding for the studied generator. The investigated version of a synchronous generator with a magnetic shunt should be used for autonomous power plants, renewable energy systems, and autonomous power supply systems.