Journal articles on the topic 'Stabilized voltage source'
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Dierikx, E. F. "A MEMS-Stabilized AC Voltage Reference Source." IEEE Transactions on Instrumentation and Measurement 56, no. 2 (April 2007): 313–15. http://dx.doi.org/10.1109/tim.2007.890799.
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Feng, Ze Hu. "The Designation of Programmable Direct-Current Voltage-Stabilized Source Based on Micro Controller Unit." Advanced Materials Research 542-543 (June 2012): 595–99. http://dx.doi.org/10.4028/www.scientific.net/amr.542-543.595.
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Along with the rapid development of the electric technology, the direct-current power was wide application, its quality immediately influence operating performance of electrical equipment or controlling system. At present, basic link of each direct-current power is approximately same in the market. They include the alternating current supply, alternating current transformer (sometimes not to use), the leveling circuit, and the filter voltage-stabilizer circuit and so on. This article introduced the method and the principle of MCU controlling system which was used in the direct-current voltage-stabilized power, realizing the digit controlling adjustment of voltage-stabilized source and step-by-step with 0.1V under the wide output. In addition, it has analyzed the working principle to cause voltage stable and the method to adjust it. This power source has the characteristic that simple to adjust the voltage, direct-viewing to be read, stable voltage output and be advantageous for the intellectualized management.
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Makinen, R. M., and M. A. Kivikoski. "A stabilized resistive voltage source for FDTD thin-wire models." IEEE Transactions on Antennas and Propagation 51, no. 7 (July 2003): 1615–22. http://dx.doi.org/10.1109/tap.2003.813613.
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LEE, YONG K., and TAEHO JUNG. "EFFECT OF EXCESS NEGATIVE IONS ON ANODIC OXIDATION IN MICROARC OXIDATION OF TITANIUM." Modern Physics Letters B 23, no. 06 (March 10, 2009): 849–54. http://dx.doi.org/10.1142/s0217984909019107.
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The effects of the electrical bias conditions on oxide film during titanium MAO (microarc oxidation) were investigated. Since DC voltage showed very low stabilized currents but produced oxide films with poor quality, the magnitude of applied voltages, duty cycles, and frequencies were modulated to control the quality of the oxide film. Pulsed voltage showed increased stabilized currents but produced better oxide films. The change in the stabilized currents was attributed to the change of the resistances of the film and local electrolyte adjacent to the anode. Analysis of the film thickness and the resistances of the film calculated from the experiments led to conclusion that the resistance of the electrolyte adjacent to the anode was increased if the negative ions attracted towards the anode were not reacted as fast as the positive ions at the cathode. The increase in resistance was attributed to the excess negative ions repelling other negative ions. In order to relax the negative ions, it appeared that a pulsed voltage source was essential. However, higher off-duty cycle was not the best choice to produce good oxide films indicating that the electrical bias condition depended on the experimental configuration.
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Xie, Jiang Hong, Jin Ping Wang, Ming Xia Shang Guan, and Yang Shao. "Research on Energy Saving Directing at Building Lighting System." Applied Mechanics and Materials 253-255 (December 2012): 679–83. http://dx.doi.org/10.4028/www.scientific.net/amm.253-255.679.
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The thesis states the building lighting regulated system composition, basic functions and work processes. Based on the compensation principle, making use of transformer controlled voltage source and the controlled current source model, the thesis analyzes the principle of the system voltage. According to the illumination and life span character of the lighting lamps and lanterns in different voltage, the thesis gets the optimal power supply of building lighting system electric lamps and lanterns. Finally, the building indoor lighting using optimal power supply voltage lighting and energy saving rate of building exterior wall using time-varying stabilized voltage control scheme are analyzed and calculated.
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Prevosto, L. "On the dynamics of cutting arc plasmas: the role of the power supply ripple." Advanced Electromagnetics 1, no. 2 (September 5, 2012): 12. http://dx.doi.org/10.7716/aem.v1i2.35.
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The power sources used in cutting arc torches are usually poorly stabilized and have a large ripple factor. The strong oscillatory components in the voltage and arc current produce in turn, large fluctuations in the plasma quantities. Experimental observations on the dynamics of the non-equilibrium plasma inside the nozzle of a 30 A oxygen cutting torch with a 7 % ripple level of its power source are reported in this work.
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Sattianadan, D., G. R. Prudhvi Kumar, R. Sridhar, Kuthuru Vishwas Reddy, Bhumireddy Sai Uday Reddy, and Panga Mamatha. "Investigation of low voltage DC microgrid using sliding mode control." International Journal of Power Electronics and Drive Systems (IJPEDS) 11, no. 4 (December 1, 2020): 2030. http://dx.doi.org/10.11591/ijpeds.v11.i4.pp2030-2037.
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As the requirement of power increases, the use of renewable energy resources has become prominent. The power collected from these energy resources needs to be converted using AC-DC or DC-DC converters. The control of DC-DC converters is a complex task due to its non-linearity in the converter introduced by the external changes such as source voltage, cable resistance and load variations. Converters are to be designed to obtain a well stabilized output voltage and load current for variable source voltages and load changes. Droop control method is the most abundantly used technique in controlling the parallel converters. The major limitations of the conventional droop control technique are circulating current issues and improper load sharing. The proposed work is to resolve these issues by integrating Sliding Mode Controller (SMC) with the converter in order to enhance the performance of DC microgrid. The entire control system was designed by taking the output voltage error as the control variables. Similarly, droop control with PI and PID were also performed and all these techniques were simulated and compared using MATLAB/Simulink. The experimental results show that the proposed sliding mode controller technique provides good overall performance and is suitable against variable voltage and load changes.
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Książek, Ireneusz. "Second order reflection from crystals used in soft X-ray spectroscopy." Nukleonika 60, no. 2 (June 1, 2015): 263–65. http://dx.doi.org/10.1515/nuka-2015-0046.
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Abstract In this note the ratio of the second to the first order reflection is determined for the KAP and PbSt crystals, for wavelengths corresponding to the Al K-line emission. The source of the radiation was a low-voltage stabilized X-ray tube. The X-rays were detected with a Bragg spectrometer equipped with a proportional counter detector. The signal measured by the proportional counter was subsequently pulse height analyzed.
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Aketagawa, Masato, and Thanh Dong Nguyen. "Picometer mechanical displacement measurement using heterodyne interferometer with phase-locked loop." EPJ Web of Conferences 238 (2020): 06003. http://dx.doi.org/10.1051/epjconf/202023806003.
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In this paper, we show picometer-order mechnical displacmment measurements using a heterodyne interferometer with a phase-locked loop (PLL). A heterodyne light source for the interferometer is implemented with a frequency stabilized HeNe laser and two acousto-optic modulators. A real time phase measurement is performed by the PLL, whose software is programmed in a field-programmable gate array (FPGA). A stiff parallel spring stage combined with a high-voltage piezoelectric actuator is used to generate picometer-order mechanical motion. With the above implementations, mechanical displacement of 10 picometer or less can be measured.
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Liu, Chen Yao, and Kuo Bin Liu. "Measurement and Testing of the NSRRC Power Supply for Conduction EMI." Advanced Materials Research 818 (September 2013): 153–58. http://dx.doi.org/10.4028/www.scientific.net/amr.818.153.
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The correction power supplies are working in the Taiwan Photon Source (TPS) of NSRRC. They are required to output current at high quality and with high performance and that has long-term stability, with output current ripple required to be less than 10ppm. The TPS comprises more than 1200 units of independent power-supplymodules working together when the beam current is at3-GeV status. The power supplies are all working in current mode. We willplan to build a new measurement laboratory for conduction Electromagnetic Interference (EMI) to measure and to test the switching DC power bus thatfeeds the correction power supplies. We can get conduction electromagnetic interferencenoise from the measurement equipmentto measure the switching DC power bus is an AC-to-DC voltage bus source.With the LISN obtainingthe conduction noise, it is a high-frequency voltage noise generated by the switching mode of the power-supply conduction noise. The current signal passes an AC source-impedance stabilized network LISN, and a spectrum analyzer obtains the conduction noise. We use a noise separator to separate the common EMI noise and the difference-mode EMI noise for EMI filtering design. The measurement results are illustrated in this paper.
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Jing, Chang Long, Qi Bin Feng, Ying Song Zhang, Guang Lei Yang, Zhi Gang Song, Zhi Qi Pei, and Guo Qiang Lv. "LED-Based 3-DMD Volumetric 3D Display." Applied Mechanics and Materials 596 (July 2014): 442–45. http://dx.doi.org/10.4028/www.scientific.net/amm.596.442.
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A solid-state volumetric true 3D display developed by Hefei University of Technology consists of two main components: a high-speed video projector and a stack of liquid crystal shutters. The shutters are based on polymer stabilized cholesteric texture material, presenting different states that can be switched by different voltage. The high-speed video projector includes LED-based light source and tree-chip digital micro-mirror devices modulating RGB lights. A sequence of slices of three-dimensional images are projected into the liquid crystal shutters locating at the proper depth, forming a true 3D image depending on the human vision persistence. The prototype is developed. The measurement results show that the screen brightness can reach 149 nit and no flickers can be perceived.
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Jadeja, R. B., S. A. Kanitkar, and Anurag Shyam. "FFT Analysis of a Series Loaded Resonant Converter-Based Power Supply for Pulsed Power Applications." International Journal of Plasma Science and Engineering 2008 (April 24, 2008): 1–5. http://dx.doi.org/10.1155/2008/284549.
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An impulse power supply has been designed, simulated, and tested in order to feed the primary of a high-frequency transformer. Pulse power system has been widely used for plasma applications. The operational principle of the pulse power system is that the energy from the input source is stored in the capacitor bank device through a dc-dc converter. Then, when a discharging signal is given, the stored energy is released to the load. The new family of ZCS converters is suitable for high-power applications using insulated gate bipolar transistors (IGBTs). The power converter can achieve zero switching with the aid of high-frequency transformer. The device is capable of charging a 0.1 μF capacitor up to 5 kV which accounts for a charging power of 5 kJ/s. The novel control algorithm is achieved which eminently considers the nonlinear control characteristics of impulse power supply. The required charging voltage, together with the constraint on the charging time, translates into a required maximum power of 10 kW reduced in this initial version to 5 kW. The difficulty to reliably control such a power at the high-voltage side practically forbids any approach featuring a more or less stabilized DC high-voltage to be generated from a conventional 50 Hz transformer through rectification.
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Silaban, Jisro, Agus Almi Nasution, and Indra Roza. "PEMANFAATAN THERMO ELECTRIC GENERATOR DARI KONVERSI ENERGI PANAS MENJADI LISTRIK UNTUK CHARGER PONSEL." JiTEKH 8, no. 2 (September 30, 2020): 71–77. http://dx.doi.org/10.35447/jitekh.v8i2.295.
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Thermo Electric generator element is a conversion system that converts heat into electricity by utilizing heat energy. This tool is designed which comes from wood fuel as a heat source, which can be converted by a Thermo Electric Generator (TEG) into electricity, because not all rural areas have electricity, so researchers use it as a back up for cellphone chargers. This research is a small scale only used for cellphone chargers, the results show that the temperature difference is a very influential factor in producing voltage output and electric current, the greater the temperature gradient (ΔT) produced, the greater the voltage output on the thermo electric. The working principle of the TEG element is that there is a temperature difference on each side, so the TEG will generate electricity. The TEG output is stabilized by an LM317 regulator to a constant 5V DC, the voltage does not fluctuate and does not cause damage to the cellphone. This element is packaged in the form of thin strips with two-sided cross sections, with one side absorbing heat and one side absorbing cold. The tool is designed to consist of 4 TEG with type TEG 12706 arranged in series to increase tension. The results of the research on the hot temperature side of at least 40.1 0C with a voltage of 0.70V DC and a maximum heat temperature of 187 0C with a voltage of 8.55V DC and on the cold side of a minimum of 0 0C a maximum of 26 0C with (P) power 0.105 W, (V) 8V DC voltage and (I) 0.013 mA current.
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An, Ke, and Kenneth L. Reifsnider. "A Multiphysics Modeling Study of (Pr0.7Sr0.3)MnO3±δ∕8mol% Yttria-Stabilized Zirconia Composite Cathodes for Solid Oxide Fuel Cells." Journal of Fuel Cell Science and Technology 2, no. 1 (October 25, 2004): 45–51. http://dx.doi.org/10.1115/1.1842782.
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Solid oxide fuel cells (SOFCs) are expected to be a future power source. Simulation analyses of SOFCs can help to understand well the interactive functions among the multiphysics phenomena in the SOFC system. A three-dimensional multiphysics finite-element model was used to simulate the performance of a half-cell SOFC with (Pr0.7Sr0.3)MnO3±δ∕8mol% yttria-stabilized zirconia (8YSZ) composite cathode on one side of the 8YSZ electrolyte before and after aging. Multiphysics phenomena in the SOFC were considered in the modeling. The current/voltage curves simulated matched the experimental data before and after aging. The average current density was found to have a linear relationship to the logarithm of the effective exchange current density. The effect of the effective ionic conductivity of the composite cathode was more apparent for small total effective ionic conductivity values than for large ones.
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Yagubov, V. S., and A. V. Shchegolkov. "Self-regulating electric heater based on elastomer, modified with multilayer carbon nanotubes." Proceedings of the Voronezh State University of Engineering Technologies 80, no. 3 (December 17, 2018): 341–45. http://dx.doi.org/10.20914/2310-1202-2018-3-341-345.
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The review of modern approaches to the development of electric heating materials makes it possible to conclude that the studies of electrically conductive composites are based on using elastomers modified with nanoscale carbon materials. In the manufacturing of electric heaters, temperature self-regulation is the main property that increases their characteristics. However, researchers engaged in studying such heaters, face difficulties associated with the magnitude of supply voltage and power. In this regard, the tasks of the present work were as follows: to study the modifier characteristics for nanomodified heaters, and to select a modifier that is best dispersed in the elastomer, which will ensure the maximum magnitude of the supply voltage and the high value of the specific power of the heater. To develop an electric heater, silicone rubber modified with carbon nanotubes was used as an elastomer. The method for manufacturing the heating element nanomodified material was described. Multi-walled carbon nanotubes synthesized through the CVD method were employed as an electrically conductive modifier. Before modifying the elastomer, the carbon nanotubes were processed in a mill at a rotational speed of working blades of 25,000 rpm. Then, the nanotubes were thermally treated in a furnace until the temperature of 110 °C was reached. After that, the nanotubes and the elastomer were mixed using a BRABENDER mixer, followed by pressing and obtaining plates of the electric heating material. To ensure contact between the heater and the power source, aluminum foil, inserted into the punches before pressing, was used. The electrical conductivity of the elastic heater nanomodified material was studied using a setup (facility) constructed especially for that purpose. Based on the results obtained, a conclusion can be made on the expediency of using different multi-walled carbon nanotubes as elastomer modifiers, which form electrically conductive networks inside the elastomer and are capable of releasing heat when connected to an electrical voltage source. Employing a non-contact method of measuring the temperature field on the electric heater surface, thermograms were recorded. It was found that the temperature field is uniformly distributed on the heater surface and is stabilized at a certain time after achieving a thermal balance with the environment. From the data obtained, it can be concluded that the heating element connected to an alternating current network with a voltage of 220 V is efficient.
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Beriber, D., A. Talha, and M. Boucherit. "Stabilization of multi DC bus link voltages of multilevel NPC VSI. Application to double stator induction motors." Archives of Control Sciences 22, no. 1 (January 1, 2012): 107–20. http://dx.doi.org/10.2478/v10170-011-0015-1.
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Stabilization of multi DC bus link voltages of multilevel NPC VSI. Application to double stator induction motors Voltage source multilevel inverters have become very attractive for power industries in power electronics applications during last years. The main purposes of studying multilevel inverters are the generation of output voltage signals with low harmonic distortion and reduction of switching frequency. An important issue of the multilevel inverter is the capacitor voltage-balancing problem. The unbalance of different DC voltage sources of multilevel neutral point clamped (NPC) voltage source inverter (VSI) constitutes the major limitation for the use of this new power converter. In this paper, we present study on the stability problem of the input DC voltages of the three-level Neutral Point Clamping (NPC) voltage source inverter (VSI). This inverter is useful for application in high voltage and high power area. In the first part, we remind the model of double stator induction motors (DSIM). Then, we develop control models of this inverter using the connection functions of the semi-conductors. We propose a Pulse Width Modulation (PWM) strategy to control this converter. The inverter is fed by constant input DC voltages. In the last part, we study the stability problem of the input DC voltages of the inverter. A cascade constituted by two three-level PWM rectifiers - two three-level NPC VSI - DSIM is discussed. The results obtained show that the input DC voltages of the inverters are not stable. To solve this problem, we propose to use a half clamping bridge. This solution is very promising in order to stabilize the input DC voltages of this converters.
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Prathepha, Krittanon, and Worawat Sa-ngiamvibool. "The investigation of natural-rubber for improving self-powered heat detector based on thermoelectric generators." EUREKA: Physics and Engineering, no. 6 (November 18, 2021): 65–73. http://dx.doi.org/10.21303/2461-4262.2021.002117.
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Fire hazard has destroyed humanity creations. Fire detectors have been developed by using different techniques. Thermoelectric generator (TEG) is a part of energy harvesting which is able to convert heat into electricity because of temperature difference between hot and cold side of thermoelectric device (TE). Different materials are used for thermoelectric generators which depend on the characteristics of the heat source, heat sink and the design of the thermoelectric generator. Many thermoelectric generator materials are currently undergoing research. This paper presented an investigation of seeking an alternative way of detecting fire hazard by developing architecture prototype of a fire detection technique using natural rubber. The thermoelectric prototype used self-powered device which improved the temperature difference gap and stabilized the cold side of TE alongside natural rubber as the cooling material. The technique is relatively simple system realization based on three viable components, i.e. a heat sensor, a low-power RF-transmitter and a RF-receiver. The heat sensor is designed and fabricated by thermoelectric and heat sink with natural rubber (NR) coating. The NR coating is heat absorption reduction. Therefore, the temperature difference is wildly resulting in the higher TE output voltage. The voltage is also supplied to the low-power RF transmitter module. In case of fire hazard, the temperature increases from 26 to 100 °C , the prototype can operate successfully. This technique will solve potentially the power supply issue in fluctuated situations. The rubber coating from rubber trees in Thailand would be a value chain added for bio-economy, supporting a sustainable development goal of the country
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Priya, E. Catherine Amala, and G. T. Sundar Rajan. "An improved model of hybrid multi converter used for grid connected applications." International Journal of Power Electronics and Drive Systems (IJPEDS) 10, no. 2 (June 1, 2019): 860. http://dx.doi.org/10.11591/ijpeds.v10.i2.pp860-867.
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A Hybrid multi converter topology is proposed in this paper, which supplies simultaneous voltage’s for various levels from Renewable energy source. The proposed topology is realized by replacing Multi cuk- buck converter topology. The resultant hybrid multi converter requires less number of switches to operate, as well as various output voltages of different levels without interruption with increased stability. This type of hybrid multi converter with high reliability and high stability are well implemented for loads utilizing various levels of DC voltage. Converter, proposed in this paper is called Hybrid Multi converter topology (HMCT). A study is made on the steady state of the HMCT and a comparative study has been made with the conventional designs. A PI controller based feedback controller is designed to stabilize the various output voltages. A simulated model for the proposed HMCT is used to simulate various output voltages of dissimilar values from mono DC- input. The performance of the converter is demonstrated using simulation model. The proposed design can be protracted to voltage source inverter, multilevel inverter to produce AC output.
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Journal, Baghdad Science. "A Comparative Study on the Electrical Characteristics of Generating Plasma by Using Different Target Sources." Baghdad Science Journal 15, no. 4 (December 9, 2018): 436–40. http://dx.doi.org/10.21123/bsj.15.4.436-440.
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In this research, the electrical characteristics of glow discharge plasma were studied. Glow discharge plasma generated in a home-made DC magnetron sputtering system, and a DC-power supply of high voltage as input to the discharge electrodes were both utilized. The distance between two electrodes is 4cm. The gas used to produce plasma is argon gas which flows inside the chamber at a rate of 40 sccm. The influence of work function for different target materials (gold, copper, and silver), - 5cm in diameter and around 1mm thickness - different working pressures, and different applied voltages on electrical characteristics (discharge current, discharge potential, and Paschen’s curve) were studied. The results showed that the discharge current and potential increase by increasing the applied voltage ranging between 300-700 V. Discharge current increased as working pressure increased in the beginning, and then semi-stabilized (slight increase) starting from 1×100 mbar, while discharge potential decreased at the beginning as working pressure increased and then semi-stabilized at the same point at which discharge current stabilized. The Paschen’s curves were compared with each other. It was concluded that the lower breakdown voltage was associated with lower work function of the (Au, Cu, and Ag) cathode material. Breakdown voltages were (395, 398, and 420) for Ag, Cu and Au respectively.
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Bondar, Sergey, Maria Zhavoronkova, Aleksandr Vostrukhin, Elena Vakhtina, and Elena Zorina. "Level Reduction of Output Noise of Reference Voltage Sources." Acta Technologica Agriculturae 21, no. 1 (March 1, 2018): 38–43. http://dx.doi.org/10.2478/ata-2018-0008.
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Abstract Technologies for processing of digital signals find broad application in all spheres of the human activity, including agriculture. Further perfecting of these technologies is related to increasing of resolving power in analogue-to-digital and digital-to-analogue converters, requiring the improvement of quality indicator of the reference voltage sources such as noise level. This paper presents the possibilities for level reduction of output noise of the reference voltage sources. Circuit solutions of the single-stage and twostage, unipolar and bipolar low-noise sources of stable voltage of direct current produced on the basis of standard integral chips of voltage stabilizers are observed. The proposed circuit solutions provide reduction of output noise level of the reference voltage sources to the level of intrinsic noise of the operational amplifiers, which are part of the developed devices. It should be emphasized that single-stage unipolar low-noise sources of stable voltage of direct current are characteristic by the inversion of output voltage polarity that takes place in accordance with the polarity of output voltage of voltage stabilizer integral chip.
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Tonkoshkur, A. S., and A. V. Ivanchenko. "Using a layer based on materials with a metal to semiconductor phase transition for electrothermal protection of solar cells." Технология и конструирование в электронной аппаратуре, no. 3-4 (2021): 57–64. http://dx.doi.org/10.15222/tkea2021.3-4.57.
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One of the main problems in ensuring the reliability of solar electrical power sources is local overheating, when hot spots form in photovoltaic cells of solar arrays. It is currently considered that these negative phenomena are caused, among other things, by overvoltage in the electrical circuits of solar arrays. This leads to the appearance of defective elements and a significant decrease in the functionality of the entire power generation system up to its complete failure. This study considers the possible ways to increase the reliability of solar arrays by using thermistor thermocontacting layers for preventing overvoltage events and overheating. The authors use simulation to study electrical characteristics of a photovoltaic cell in thermal contact with an additional layer based on thermistor materials with a metal to semiconductor phase transition. Vanadium dioxide with a phase transition temperature of ~340 K is considered to be a promising material for this purpose. During the phase transition, electrical resistance sharply decreases from the values characteristic of dielectrics to the values associated with metal conductors. It is shown that such thermistor layers can be used for protecting solar cells from electrical overheating under the following basic conditions: — the layer’s resistance in the «cold» state significantly exceeds that of the lightened forward-biased solar cell; — the layer’s resistance in the «heated» state is sufficiently low compared to those of the reverse-biased photovoltaic cell and of the power source. The current and temperature of the reverse-biased photovoltaic cell are limited and stabilized, and the voltage drop sharply decreases from the moment when the temperature of the thermistor layer reaches the values close to the temperature of its transition to the low-conductivity state. The obtained results substantiate the potntial of the described approach to protect photovoltaic cells of solar modules against electric thermal overloads.
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Bouchafaa, Farid, Mohamed Seghir Boucherit, and El Madjid Berkouk. "Feedback Loop Control Strategies of the Multi Dc Bus Link Voltages Using Adaptive Fuzzy Logic Control." Journal of Electrical Engineering 64, no. 3 (May 1, 2013): 143–51. http://dx.doi.org/10.2478/jee-2013-0021.
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Voltage source multilevel inverters have become very attractive for power industries in power electronics applications during last years. The main purposes that have led to the development of the studies about multilevel inverters are the generation of output voltage signals with low harmonic distortion; the reduction of switching frequency. A serious constraint in a multilevel inverter is the capacitor voltage-balancing problem. The unbalance of different DC voltage sources of five-level neutral point clamping (NPC) voltage source inverter (VSI) constitutes the major limitation for the use of this new power converter. In order to stabilize these DC voltages, we propose in this paper to study the cascade constituted by three phases five-level PWM rectifier, a clamping bridge and five-level NPC (VSI). In the first part, we present a topology of five-level NPC VSI, and then they propose a model of this converter and an optimal PWM strategy to control it using four bipolar carriers. Then in the second part, we study a five-level PWM rectifier, which is controlled by a multiband hysteresis strategy. In the last part of this paper, the authors study shows particularly the problem of the stability of the multi DC voltages of the inverter and its consequence on the performances of the induction motors (IM). Then, we propose a solution to the problem by employed closed loop regulation using PI regulator type fuzzy logic controller (FLC). The results obtained with this solution confirm the good performances of the proposed solution, and promise to use the inverter in high voltage and great power applications as electrical traction.
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Wang, Guishuo, Xiaoli Wang, Fuan Wang, and Zhao Han. "Research on Hierarchical Control Strategy of AC/DC Hybrid Microgrid Based on Power Coordination Control." Applied Sciences 10, no. 21 (October 28, 2020): 7603. http://dx.doi.org/10.3390/app10217603.
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The AC/DC hybrid microgrid has a large-scale and complex control process. It is of great significance and value to design a reasonable power coordination control strategy to maintain the power balance of the system. Based on hierarchical control, this paper designs a reasonable power coordination control strategy for AC/DC hybrid microgrid. For lower control, this paper designs a variety of control modes for each converter in different application scenarios. For the higher control, this paper analyzes the working mode of the system and designs the power coordination control strategy under the grid-connected and isolated island mode. In grid-connected operation, the DC bus voltage can be stabilized by adjusting the operation mode of the DC energy storage and the on-off of the secondary load. In isolated island operation, the DC sub-microgrid is the main microgrid, and the DC energy storage is the main power regulating equipment. This is based on the principle of “energy is in short supply in the system, DC energy storage finally discharge, energy supply exceeds demand in the system, DC energy storage gives priority to charging” of DC energy storage. By adjusting the control strategy of the micro-source, the reference power, and the on-off of the secondary load, the overall power balance is maintained. The Matlab/Simulink simulation software was used to build the AC/DC hybrid microgrid simulation model, which verified the effectiveness and stability of the proposed power coordination control strategy under various operating conditions.
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Cheremukhin, Dmitry. "Calculation of pulse voltage stabilizer." E3S Web of Conferences 178 (2020): 01055. http://dx.doi.org/10.1051/e3sconf/202017801055.
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This scientific article is devoted to one of the priority issues in electronics, namely the implementation of the engineering task of designing a power source. In my case, according to the terms of reference, which includes: the main parameters of the network, efficiency, a structural electrical circuit of a switching power supply was developed. In the process, the main functional units (blocks) were calculated and the choice of radio components from which they were built on the basis of: current values, reverse voltage, gain, operating frequency and other parameters of diodes, transistors, integrated circuits, Zener diodes, operational amplifiers was justified. In the “Methods” section, calculations will be made for the device blocks: a network rectifier, a push-pull transformer converter, a pre-amplifier circuit with a transformer input, an error signal comparison and amplification circuit, a sawtooth voltage generator, and a secondary power source. The information presented in the text is recommended to a narrow circle of specialists, priority in the field of power electronics, as well as in the field of communication systems.
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Benamrane, Karima, Tarak Benslimane, Othmane Abdelkhalek, Thameur Abdelkrim, and Abdelhalim Borni. "Performance Evaluation and Comparison of Two Cascaded Configurations of PV Generators-Five Levels Inverter for a Stand-Alone Application in South Algeria." International Journal of Power Electronics and Drive Systems (IJPEDS) 8, no. 2 (June 1, 2017): 907. http://dx.doi.org/10.11591/ijpeds.v8.i2.pp907-916.
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In this paper two configurations of solar photovoltaic energy conversion using the NPC five levels inverter for stand-alone application in south Algeria are proposed and their performances compared. The first cascade uses four separate PV sources and the second configuration use only one PV generator. In these two cases and without DC/DC converter introduced between PV source and inverter and to get a stable AC voltage, authors in propose a proportional regulator of inverter modulation index. The SVPWM technique is used in order to get the best voltage waveform. For the second configuration proposed, we introduce in the control loops another algorithm which uses the redundant vectors of space vector diagram of inverter to stabilise the DC bus voltages. A real data of temperature and solar irradiation obtained by radiometric station in Ghardaïa city in south Algeria are used to test the performance of proposed controls. The simulation results show that the inverter output voltage is stable for the two configurations proposed despite the variation of solar irradiation, temperature and load. Also, the THD obtained is in the limits of international standards. Then, the PV cascade with separate PV sources is the best solution, seeing that we do not need to use another algorithm in the control loops.
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Sivakumar, P., and C. Birindha. "Analysis and Stability Enhancement of DG Sourced Power System with Modified AVR and PSS." Advanced Materials Research 768 (September 2013): 313–16. http://dx.doi.org/10.4028/www.scientific.net/amr.768.313.
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Distribution system is facing stability issues with integration of distributed generators and controllers. This proposed method presents the stability of renewable energy based distribution system with varying energy source considering intermittent nature of wind and solar energy using probabilistic approach. The system is supplied by conventional and distributed generating sources like PV and wind. Monte Carlo approach is used for predicting the wind and solar power uncertainties. Proposed work explains both small signal stability and transient stability enhancement of DG sourced power system with power system stabilizer and automatic voltage regulator .It is carried out in is 4 machine 10 bus system. The initial simulation has been carried out using MATLAB/SIMULINK.
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Suryadi, Aris, Purwandito Tulus Asmoro, and Agus Sofwan. "Design and Simulation Converter with Buck-boost Converter as The Voltage Stabilizer." International Journal of Electrical, Energy and Power System Engineering 3, no. 3 (October 12, 2020): 77–81. http://dx.doi.org/10.31258/ijeepse.3.3.77-81.
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Buck-boost Converter is the device with the function to convert DC Voltage input to the setpoint DC Voltage output. Buck-boost converter can be used for regulating unstable voltage became a stable voltage by the user’s needs. Using a Buck-boost Converter in the research is about how to apply a Buck-boost Converter of the AC to AC Converter device, AC to AC Converter is the device to convert AC voltage to AC Voltage where the voltage can be modified. In the research, the input Voltage of AC to AC Converter is unstable, so that the output Voltage is unstable too in the range of 190 V to 250 V. To solve this problem, that the Buck-boost can be installed to AC to AC Converter, it is useful to keep output Voltage stable even though the input Voltage is unstable. The AC to AC Converter device in this research consist of Rectifier, Buck-boost Converter, and Inverter. The experiment result of this research show that unstable AC input Voltage, 190 V to 250 V from the source after passing a Rectifier, became an unstable DC input Voltage, then be regulated by Buck-boost Converter became a stable DC Voltage, and then after passing the Inverter, a stable DC Voltage is converted became a stable AC Voltage, corresponding with the set point. For further development, AC to AC Converter combined with Buck-boost Converter can be applied to maintain a standard of Voltage 220 V AC from the sources to keep it stable.
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Deng, Junli, Yuan Mao, and Yun Yang. "Distribution Power Loss Reduction of Standalone DC Microgrids Using Adaptive Differential Evolution-Based Control for Distributed Battery Systems." Energies 13, no. 9 (April 27, 2020): 2129. http://dx.doi.org/10.3390/en13092129.
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With high penetrations of renewable energy sources (RES), distributed battery systems (DBS) are widely adopted in standalone DC microgrids to stabilize the bus voltages by balancing the active power. This paper presents an Adaptive Differential Evolution (ADE)-based hierarchical control for DBS to achieve online distribution power loss mitigation as well as bus voltage regulations in standalone DC microgrids. The hierarchical control comprises two layers, i.e., ADE for the secondary layer and local proportional-integral (PI) control for the primary layer. The secondary layer control provides the bus voltage references for the primary control by optimizing the fitness function, which contains the parameters of the bus voltage deviations and the power loss on the distribution lines. Simultaneously, the state-of-charge (SoC) of the battery packs are controlled by local controllers to prevent over-charge and deep-discharge. Case studies using a Real-Time Digital Simulator (RTDS) validate that the proposed ADE-based hierarchical control can effectively reduce the distribution power loss and regulate the bus voltages within the tolerances in DC microgrids.
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Bondar, S. N., E. A. Vakhtina, S. V. Mishukov, and E. E. Konstantinova. "A Low-Noise DC Voltage Stabilizer Based on a General-Purpose Reference Voltage Source." Russian Electrical Engineering 92, no. 7 (July 2021): 384–88. http://dx.doi.org/10.3103/s1068371221070051.
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Azhar, Hamzah Maulana. "Optimasi Battery Charging pada Pendingin Minuman dengan Sumber Solar Cell untuk Beban Peltier Menggunakan Buckboost Converter." Journal of Applied Smart Electrical Network and Systems 2, no. 01 (June 30, 2021): 1–7. http://dx.doi.org/10.52158/jasens.v2i01.197.
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Currently, many electronic devices use the energy source from the solar cell which is stored in a battery. The battery is a portable, rechargeable power source. Solar energy is very suitable when converted to electrical energy because the amount of sunlight is infinite even though there is a period of time between sunrise and sunset. Converting solar energy to electrical energy requires a solar cell. One method that can be done is using the buck boost converter method with solar cell sources to create a battery charging control system. The Buck Boost Converter method was chosen because it can stabilize the output voltage from the solar cell when the weather is uncertain. If the light intensity of the sunlight is dim, the output voltage of the panel will also be low, then the converter will be in boost mode to increase the voltage level, on the other hand, if the light intensity of the panel output voltage will also be high, the converter will be in buck mode to lower the voltage level. The output voltage of this control system is maintained according to the battery charging voltage standard, which is 14 volts DC.
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Tian, Yutao, Stefan H. Heinemann, and Toshinori Hoshi. "Large-conductance Ca2+- and voltage-gated K+channels form and break interactions with membrane lipids during each gating cycle." Proceedings of the National Academy of Sciences 116, no. 17 (April 9, 2019): 8591–96. http://dx.doi.org/10.1073/pnas.1901381116.
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Membrane depolarization and intracellular Ca2+promote activation of the large-conductance Ca2+- and voltage-gated (Slo1) big potassium (BK) channel. We examined the physical interactions that stabilize the closed and open conformations of the ion conduction gate of the human Slo1 channel using electrophysiological and computational approaches. The results show that the closed conformation is stabilized by intersubunit ion–ion interactions involving negative residues (E321 and E324) and positive residues (329RKK331) at the cytoplasmic ends of the transmembrane S6 segments (“RKK ring”). When the channel gate is open, the RKK ring is broken and the positive residues instead make electrostatic interactions with nearby membrane lipid oxygen atoms. E321 and E324 are stabilized by water. When the329RKK331residues are mutated to hydrophobic amino acids, these residues form even stronger hydrophobic interactions with the lipid tails to promote the open conformation, shifting the voltage dependence of activation to the negative direction by up to 400 mV and stabilizing the selectivity filter region. Thus, the RKK segment forms electrostatic interactions with oxygen atoms from two sources, other amino acid residues (E321/E324), and membrane lipids, depending on the gate status. Each time the channel opens and closes, the aforementioned interactions are formed and broken. This lipid-dependent Slo1 gating may explain how amphipathic signaling molecules and pharmacologically active agents influence the channel activity, and a similar mechanism may be operative in other ion channels.
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Oodo, Stephen, and Felix S. Owolabi. "Application of a Genetic Algorithm for Improving Voltage Profile with Distributed Generation." European Journal of Engineering Research and Science 4, no. 1 (January 24, 2019): 64–68. http://dx.doi.org/10.24018/ejers.2019.4.1.1063.
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The purpose of a power grid is to transfer electrical energy from the production to the consumption, while maintaining an acceptable reliability and voltage quality for all customers. This research paper present the integration of generation based on Biogas power renewable energy source to the Distribution network and how it stabilizes the network by normalizing the fluctuating voltage at the distribution end of power system. A Genetic Algorithm model was performed and evaluation of the impact of the DG by stimulating the developed model in the system. A mathematical formulation and optimization algorithm was performed using the MATLAB/Simulink program. The results obtained were correction of the faulty buses voltages and stable power supply which is 25% better than the conventional one. It was concluded that the implementation of the optimisation technique has improved the energy efficiency of the distribution network.
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Oodo, Stephen, and Felix S. Owolabi. "Application of a Genetic Algorithm for Improving Voltage Profile with Distributed Generation." European Journal of Engineering and Technology Research 4, no. 1 (January 24, 2019): 64–68. http://dx.doi.org/10.24018/ejeng.2019.4.1.1063.
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The purpose of a power grid is to transfer electrical energy from the production to the consumption, while maintaining an acceptable reliability and voltage quality for all customers. This research paper present the integration of generation based on Biogas power renewable energy source to the Distribution network and how it stabilizes the network by normalizing the fluctuating voltage at the distribution end of power system. A Genetic Algorithm model was performed and evaluation of the impact of the DG by stimulating the developed model in the system. A mathematical formulation and optimization algorithm was performed using the MATLAB/Simulink program. The results obtained were correction of the faulty buses voltages and stable power supply which is 25% better than the conventional one. It was concluded that the implementation of the optimisation technique has improved the energy efficiency of the distribution network.
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Oodo, Stephen, and Felix Sanjo Owolabi. "Application of a Particle Swarm Optimization for Improving Voltage Profile with Distributed Generation: A Case Study of 33/0.415KV Abuja Airport Injection Substation." European Journal of Engineering Research and Science 4, no. 3 (March 19, 2019): 100–106. http://dx.doi.org/10.24018/ejers.2019.4.3.1116.
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The important of electric power distribution is to have centralized plants distributing electricity through Distributed generation (DG) which reduces the cost of maintenance on transmission and distribution station and also improve voltage profile. This research paper present the application of generation based on Biogas power renewable energy source to the Distribution network and how it stabilizes the network by normalizing the fluctuating voltage profile at the distribution end of power system. A Particle Swarm Optimization (PSO) model was performed and evaluation of the impact of the DG by stimulating the developed model in the system. A mathematical formulation and optimization algorithm was performed using the MATLAB/Simulink program. The results obtained were correction of the faulty buses voltages and stable power supply which is 29.4% better than the conventional one. The result shows the implementation of the optimisation technique has improved the energy efficiency of the distribution network.
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Oodo, Stephen, and Felix Sanjo Owolabi. "Application of a Particle Swarm Optimization for Improving Voltage Profile with Distributed Generation: A Case Study of 33/0.415KV Abuja Airport Injection Substation." European Journal of Engineering and Technology Research 4, no. 3 (March 19, 2019): 100–106. http://dx.doi.org/10.24018/ejeng.2019.4.3.1116.
Full textAbstract:
The important of electric power distribution is to have centralized plants distributing electricity through Distributed generation (DG) which reduces the cost of maintenance on transmission and distribution station and also improve voltage profile. This research paper present the application of generation based on Biogas power renewable energy source to the Distribution network and how it stabilizes the network by normalizing the fluctuating voltage profile at the distribution end of power system. A Particle Swarm Optimization (PSO) model was performed and evaluation of the impact of the DG by stimulating the developed model in the system. A mathematical formulation and optimization algorithm was performed using the MATLAB/Simulink program. The results obtained were correction of the faulty buses voltages and stable power supply which is 29.4% better than the conventional one. The result shows the implementation of the optimisation technique has improved the energy efficiency of the distribution network.
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Аitzhanov, N. M., B. Оngar, P. А. Bissenbaeyev, Е. S. Baitenov, and А. Zhanibekuly. "ASSESSMENT OF ENERGY EFFICIENCY AND POSSIBILITY OF USE IN THE NETWORKS OF INDUSTRIAL ENTERPRISES VOLTAGE STABILIZER WITH ENERGY SAVING FUNCTION." PHYSICO-MATHEMATICAL SERIES 6, no. 334 (December 15, 2020): 74–80. http://dx.doi.org/10.32014/2020.2518-1726.100.
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The energy-saving voltage stabilizer belongs to the field of electrical engineering and can be used to supply power to electrical equipment, drives, motors, lighting networks, power supplies for communication systems, automation and telematics in order to optimize the operation of electrical equipment and energy saving. Reducing power consumption can be achieved by eliminating the consumption of the load unnecessary for normal operation of energy, and by reducing the amount of current and energy losses in the supply network. In addition, the service life of lighting and household electrical appliances will increase, which will operate at normal and not increased voltage. When the voltage decreases and the load consumes the same power, the current in the network increases in proportion to the decrease in voltage, which will cause overheating of the network elements to the place where the stabilizer is installed, the operation of automatic devices, fuses and other protection elements, i.e. interruption in power supply to consumers. Any stabilizer is not a source of energy, and its use with a significant decrease in the voltage in the network (power shortage) does not give the desired result. ECE of such stabilizers is 95-97%, that is, up to 5% of energy is lost in the regulating device, which limits their use in order to save energy, as well as increase the weight, dimensions and cost. The proposed device is based on the use as a regulating body of a low-power transformer operating in the autotransformer mode with a transformation ratio close to 1. By switching the high-voltage winding of the transformer under load without breaking the circuit, 3 operating modes of the device are obtained. Control devices are used: to reduce electricity consumption by up to 20% in residential and public buildings, shops, outdoor lighting networks; to ensure the normal operation of numerically controlled machines, technological lines, etc. It has no analogs in terms of simplicity of the scheme, payback (about two years), and reliability of operation. It will reduce the unnecessary energy consumption allowed worldwide by at least 10% and network losses by up to 40%.
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Maloth, Naresh. "Power Flow Control in Distributed Generation System of PFC Rectifier for DC Motor Drive." Scientific Bulletin of Naval Academy XXI, no. 2 (December 15, 2018): 68–79. http://dx.doi.org/10.21279/1454-864x-18-i2-007.
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In this paper is to performance and analysis of grid connected power flow control and power quality improvement in distribution generation (DG) system a new topology of harmonic injection current, connected for a grid mode and DC motor drive. Inherently the system power factor is low and it has high harmonic content in the current. The Swiss rectifier is based on harmonic current injection methods on power flow control and implementation of Power factor correction (PFC), Rectifier, the harmonic mitigating pulse width modulation (PWM) technique have been used to reduce the harmonics for power quality improvement. The renewable sources have been used as DC source and control technique has been used with step up DC-DC converter to regulate DC-link voltage. The second close loop control has been done for voltage source inverter to stabilize its terminal voltage. The DC-AC converter provides the bidirectional power flow between point of common coupling (PCC) and local load. The step up converter regulates the DC link voltage to exchange the power with the three phase feeders, also it is conformed the harmonic current can be satisfied with the proposed method. The simulation Study is performed in MATLAB/ SIMULINK.
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Nasir, M. N. M., Awang Jusoh, and Alias Khamis. "DC Bus Instability Driving by Photovoltaic Source with Constant Power Load." Applied Mechanics and Materials 313-314 (March 2013): 853–57. http://dx.doi.org/10.4028/www.scientific.net/amm.313-314.853.
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This study presented the DC bus instability in distributed power system driving by Photovoltaic (PV) source with constant power load (CPL). The aim of this study is to investigate the effect of PV source towards the performances of DC bus voltage stability using constant power load. The system first was tested using linear DC supply as voltage source and CPL was modeled and connected to the voltage source through LC filter network. A passive damping circuit was chosen to stabilize the DC bus instability. The system was repeated using PV source. PV array was modeled based on the parameters obtained from a commercial PV data sheet. A circuitry simulation was performed under the similar design excluding the DC source in order to investigate DC bus instability. Results showed that the stability of DC bus become unstable when using linear DC voltage supply and slightly affected when using PV source. The instability phenomenon due to the negative incremental impedance of a constant power load can be overcome by using damping technique. For linear DC voltage source, DC bus voltage system tends to oscillate. However, with PV source which is actually a current source input seems not much affecting the DC bus voltage stability.
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Huang, Yunhui, Jinrui Tang, Guorong Zhu, Xianqiang Li, Haiyan Tang, and Yan Li. "Research on DC-link voltage stabiliser for voltage source converter as connected to weak grid." Journal of Engineering 2017, no. 13 (January 1, 2017): 2168–72. http://dx.doi.org/10.1049/joe.2017.0714.
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Matveev, Andris Ilmarovich, and Sergey Andreevich Andreev. "Dynamic communication of ionistors in power sources of elements of telemetric stystems." Agrarian Scientific Journal, no. 1 (January 27, 2019): 76–81. http://dx.doi.org/10.28983/asj.v0i1.569.
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The article describes the modes of dynamic switching of ionistors, which allow to eliminate both mentioned shortcomings. Thermal losses are eliminated by replacing the parametric stabilizer with an electronic device that supplies electrical energy in a pulsed mode. In this case, the average value of the voltage on the supplied technical means can be varied in a wide range. To use the energy remaining in the ionistor at a voltage lower than the consumer's supply voltage, it is proposed to change the interconnection schemes of ionistors in the group.
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Suwarno, Suwarno, and Tole Sutikno. "Implementation of Buck-Boost Converter as Low Voltage Stabilizer at 15 V." International Journal of Electrical and Computer Engineering (IJECE) 9, no. 4 (August 1, 2019): 2230. http://dx.doi.org/10.11591/ijece.v9i4.pp2230-2237.
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<p>This paper presents the implementation of the buck-boost converter design which is a power electronics applications that can stabilize voltage, even though the input voltage changes. Regulator to stabilize the voltage using PWM pulse that triger pin 2 on XL6009. In this design of buck-boost converter is implemented using the XL6009, LM7815 and TIP2955. LM7815 as output voltage regulator at 15V with 1A output current, while TIP2955 is able to overcome output current up to 5A. When the LM7815 and TIP2955 are connected in parallel, the converter can increase the output current to 6A.. Testing is done using varied voltage sources that can be set. The results obtained from this design can be applied to PV (Photovoltaic) and WP (Wind Power), with changes in input voltage between 3-21V dc can produce output voltage 15V.</p>
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Raju.K, Narasimha, G. D. V. Sai Pavan.G, S. V. Harish.S, and Vignesh R. "An Improved Hybrid PWM Technique for DC Capacitors Voltage Balance of Five Level DCMLI." International Journal of Engineering & Technology 7, no. 2 (April 20, 2018): 591. http://dx.doi.org/10.14419/ijet.v7i2.9799.
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The innate problem with five-level Diode Clamped Multi Level Inverter (DCMLI) is imbalance in supply DC capacitor voltages. This paper presents a novel Hybrid Pulse Width Modulation (PWM) technique to stabilize the capacitor voltages. The unbalance in capacitor voltages leads to decrement in inverter level, increase in switching stress and distortion in the output voltage. The existing solutions to this problem use either a back to back connection of inverter and rectifier or external dc sources for each capacitor, but there isn’t a solution which would inherently balance the capacitor voltages of five levels and above for DCMLI. To rectify this problem a novel hybrid PWM technique which is combination of Carrier based PWM (CBPWM) and Space Vector Modulation (SVM) is proposed. As per this technique conventional CBPWM is applied to meet the load demand and SVM is applied at certain selective intervals to balance the capacitors. The novelty lies in selection of appropriate switching state and the interval at which it must be applied to balance the capacitor voltages. This technique is simple to implement and gives rise to less switching losses.
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Zhao, Wei, Xiao Rong Zhu, and Jian Chao Zhang. "Reactive Power and Voltage Coordinated Control Research of Wind Farm Adopting Doubly-Fed Induction Generators." Advanced Materials Research 1003 (July 2014): 152–55. http://dx.doi.org/10.4028/www.scientific.net/amr.1003.152.
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For the wind power grid voltage control problem, this paper proposed a reactive power and voltage control strategy by coordinate the wind farm reactive power source. Considering wind internal loss and the machine voltage deviation, established a optimal control model and a objective function, using the improved particle swarm optimization (PSO) algorithm to solve the function, the control strategy can reduce the wind internal loss and stabilize the voltage of the machine on the basis of meet the requirements of PCC voltage. The example simulation proved the effectiveness and economy of the control strategy.
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Nguyen, Cuong V., Minh T. Nguyen, Toan V. Quyen, Anh M. Le, Antonino Masaracchia, Ha T. Nguyen, Huy P. Nguyen, Long D. Nguyen, Hoa T. Nguyen, and Vinh Q. Nguyen. "Hybrid Solar-RF Energy Harvesting Systems for Electric Operated Wheelchairs." Electronics 9, no. 5 (May 2, 2020): 752. http://dx.doi.org/10.3390/electronics9050752.
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Over the decades, with the advancement of science and technology, wheelchairs have undergone remarkable changes, such as controlling an electrical wheelchair by using brain signals. However, existing electrical wheelchairs still need improvements in terms of energy management. This paper proposes an hybrid Solar-Radio frequency (RF) harvesting system able to supply power for the continuous and effective operation of electrically powered wheelchairs. This system can simultaneously harvest power from RF and solar source that are both available in the surrounding environment. A maximum power point tracking (MPPT) and a boost converter are exclusively employed for the standalone solar system while the standalone RF system is equipped with a 9-stage voltage multiplier (VM). The voltage level for the charging process is obtained by adding the output voltage of each source. In addition, a current booster and a stabilizer are used to reach the required level of current and pin the charging voltage to a stable level, respectively. Simulation results show how the hybrid system is better and more stable when the boost current and stabilizer are used in the charging system. Moreover, we also provide some analytic results to prove the advantages of this system.
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Edla, Mahesh, Yee Yan Lim, Ricardo Vasquez Padilla, and Mikio Deguchi. "An Improved Rectifier Circuit for Piezoelectric Energy Harvesting from Human Motion." Applied Sciences 11, no. 5 (February 24, 2021): 2008. http://dx.doi.org/10.3390/app11052008.
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Harvesting energy from human motion for powering small scale electronic devices is attracting research interest in recent years. A piezoelectric device (PD) is capable of harvesting energy from mechanical motions, in the form of alternating current (AC) voltage. The AC voltage generated is of low frequency and is often unstable due to the nature of human motion, which renders it unsuitable for charging storage device. Thus, an electronic circuit such as a full bridge rectifier (FBR) is required for direct current (DC) conversion. However, due to forward voltage loss across the diodes, the rectified voltage and output power are low and unstable. In addition, the suitability of existing rectifier circuits in converting AC voltage generated by PD as a result of low frequency human motion induced non-sinusoidal vibration is unknown. In this paper, an improved H-Bridge rectifier circuit is proposed to increase and to stabilise the output voltage. To study the effectiveness of the proposed circuit for human motion application, a series of experimental tests were conducted. Firstly, the performance of the H-Bridge rectifier circuit was studied using a PD attached to a cantilever beam subject to low frequency excitations using a mechanical shaker. Real-life testing was then conducted with the source of excitation changed to a human performing continuous cycling and walking motions at a different speed. Results show that the H-Bridge circuit prominently increases the rectified voltage and output power, while stabilises the voltage when compared to the conventional FBR circuit. This study shows that the proposed circuit is potentially suitable for PEH from human motion.
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P, Thirumalini, R. Arulmozhiyal, and M. Murali. "A Cascade Multilevel Z-Source Inverter for Photovoltaic System." TELKOMNIKA Indonesian Journal of Electrical Engineering 16, no. 3 (December 1, 2015): 473. http://dx.doi.org/10.11591/tijee.v16i3.1637.
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This paper describes a multilevel Z-source inverter for solar photovoltaic applications. The conventional power conversion topology performs either buck or boost the input voltage for non linear load depending upon duty ratio and modulation index in a multiple stage conversion with the help of impedance source passive network (L and C), which is usually known as Z-Source, which couples the n level source with input to the power source and increase the power efficiency. The multilevel z network capabilities of inverter are operated in the shoot through state of duty cycle and it acts as a filter to reduces the level of harmonics, stabilize power factor and to increase the output AC voltage range of inverter. To overcome further harmonics, multilevel level operation z source inverter compensates the fundamental level of harmonic in renewable. Proposed work as a whole involves the simulation part to design multilevel inverter. The output of the simulation is obtained by Simulink model using MATLAB.
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N, Prakash, and Balaji V.R. "Three phase voltage source inverters with grid connected industrial application." International Journal of Engineering & Technology 7, no. 4 (April 16, 2018): 18. http://dx.doi.org/10.14419/ijet.v7i2.9.9653.
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The grid-connected issue is one of the major problems in the field of Power Electronics. In this paper, the Three Phase Voltage Source Inverter (VSI) is controlled by a Space Vector Pulse Width Modulation (SVPWM) Technique. SVPWM control technique and Park transformation, the managed inverter control system to convert input DC power into AC power, stabilize the output voltage and current, and feeds the excess power to the utility grid can be achieved by controllers. Usually, the grid source contains higher level of harmonics. To analyze the harmonics, nonlinear load is connected externally in the point of common coupling. The main aim of this paper is to modeling, simulation and experimental study of the three-phase grid connected inverter. By using the control algorithm, the grid sides Total Harmonics Distortion (THD) are controlled to the 1.54% for 800V DC as per the IEEE standard. The stimulation results such as AC output voltage and current, inverter system power flow, and grid disturbances detection signals, proves the effectiveness of the developed control algorithm. The control algorithms to makes the for this inverter outputs is pure sinusoidal.
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Thota, Someshwara, Vinay Kumar Awaar, Praveen Jugge, and S. Tara Kalyani. "Grid-Connected Rectifier Based Dynamic Voltage Restorer To Improve Power Quality By Compensating Voltage Sag And Swell." E3S Web of Conferences 309 (2021): 01108. http://dx.doi.org/10.1051/e3sconf/202130901108.
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Voltage sag and voltage swell are frequently occurred power quality problems in present power distribution system, which are cause more problems to avoid these problems and maintain constant voltage at sensitive load during sag and swell Dynamic voltage restorer gives solution .we propose self-supported DVR, to minimize the cost by preventing external dc source in DVR, it is controlled by SRF PI control along with an inner current loop to stabilize the system and outer voltage loop to increase the system robustness. The proposed model provides fast voltage restoration for a short and long duration of voltage sags and swells manage wide load current variation for short and long voltage disturbances. In this paper, we present the effectiveness of the proposed method by using MATLAB/simulation results. A laboratory prototype DVR is modelled and we are using CCS studio to interface DSPTMS320F28027F
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Wang, L. B., C. X. Mao, D. Wang, J. M. Lu, J. F. Zhang, and X. Chen. "Extended Unbalanced Operation of Induction Motor Driven System Based on a Single-Phase Electronic Power Transformer." Journal of Circuits, Systems and Computers 24, no. 04 (March 4, 2015): 1550045. http://dx.doi.org/10.1142/s0218126615500450.
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A new control strategy to extend the unbalanced operation of the induction motor driven system based on a single-phase electronic power transformer (EPT) is proposed in this paper. This new motor driven system avoids the traditional input power transformer and only single-phase power network is needed. It has a modular structure and consists of series H-bridges rectifier, output-parallel dual active bridge converters and a three-phase voltage source inverter. In the input stage, a new control strategy is proposed to balance the dc voltages among the series H-bridges and regulate the current. This new control algorithm determines the minimal reactive current to stabilize the converter when the loads are seriously unbalanced. In order to verify the new driven system, a 3 kV/462 V/180 kW EPT driving an induction motor is constructed in MATLAB/SIMULINK. The simulations results illustrate the effectiveness of the proposed unbalanced control algorithm and good dynamic behavior of the integrated control system for this new driven system.
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Usmanov, E. G., and B. M. Khusanov. "Phase relations in resonant circuits with a wide falling section on the amplitude characteristic." E3S Web of Conferences 216 (2020): 01161. http://dx.doi.org/10.1051/e3sconf/202021601161.
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This article examines the features of circuits in order to determine the possibility of their use for controlling thyristors when building new, simple and reliable circuits for controlling boost voltage stabilizers. In ferroresonant circuits connected to a voltage source with a low internal resistance, with a certain combination of parameters, oscillations are excited at the fundamental frequency, the initial phase of which has a shift with respect to the phase of the applied voltage. Moreover, the phase of the excited oscillations depends on the magnitude of the applied emf.