Gotowe bibliografie tematyczne / Variable frequency drive schemes

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Gotowa bibliografia na temat „Variable frequency drive schemes”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Variable frequency drive schemes"

Alwadie, Abdullah. "A Concise Review of Control Techniques for Reliable and Efficient Control of Induction Motor". International Journal of Power Electronics and Drive Systems (IJPEDS) 9, nr 3 (1.09.2018): 1124. http://dx.doi.org/10.11591/ijpeds.v9.i3.pp1124-1139.

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<span style="color: black; font-family: 'Times New Roman','serif'; font-size: 10pt; mso-fareast-font-family: SimSun; mso-themecolor: text1; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;">Induction motors are work-horse of the industry and major element in energy conversion. The replacement of the existing non-adjustable speed drives with the modern variable frequency drives would save considerable amount of electricity. A proper control scheme for variable frequency drives can enhance the efficiency and performance of the drive. This paper attempt to provide a rigorous review of various control schemes for the induction motor control and provides critical analysis and guidelines for the future research work. A detailed study of sensor based control schemes and sensor-less control schemes has been investigated. The operation, advantages, and limitations of the various control schemes are highlighted and different types of optimization techniques have been suggested to overcome the limitations of control techniques</span>

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Okedu, Kenneth E., i Akhtar Kalam. "Comparative Study of Grid Frequency Stability Using Flywheel-Based Variable-Speed Drive and Energy Capacitor System". Energies 16, nr 8 (18.04.2023): 3515. http://dx.doi.org/10.3390/en16083515.

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Recently, there has been a rise in the integration of renewable energy sources into power grids. As a result of this, there is a need to carry out new studies in order to understand the dynamics of power grids during disturbances that is mainly caused by the stochastic nature of wind energy. The operation of modern power grids that are tied to wind farms follows a stipulated grid requirement or grid codes, considering the allowable threshold frequency variation during grid dynamics. This paper presents a comparative study of two frequency control schemes considering grid frequency stability using two frequency control topologies. A novel dynamic flywheel scheme with a doubly fed induction generator (DFIG) variable-speed wind turbine with the coordinated control of excess kinetic energy and mechanical torque during operation was the first scheme, and a control strategy of an energy capacitor system (ECS) with a squirrel cage induction generator fixed-speed wind turbine (FSWT) was the second scheme. The salient part of this study was that the DFIG maximum point power tracking for effective smoothing of the output of the wind generator in the first scheme was designed based on the control strategy of its reference power to achieve smoothing of the wind power at the terminals of the wind generator. The model system employed in this work was a wind farm that is tied to a conventional power grid made of steam and hydro synchronous turbines. For an effective and fair comparison of results, the same natural wind speed was used in PSCAD/EMTDC for both schemes. When no control, Scheme 1, and Scheme 2 were implemented, the frequency dips were 47.20, 49.99, and 49.99 Hz with overshoots of 50.500, 50.005, and 50.001 Hz and recovery times of over 600.00, 0.01, 0.01 s, respectively, for the frequency variable.

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Vasilyev, D. A., R. I. Gavrilov i L. A. Panteleeva. "Energy-efficient variable frequency asynchronous electric drive". Journal of Physics: Conference Series 2061, nr 1 (1.10.2021): 012053. http://dx.doi.org/10.1088/1742-6596/2061/1/012053.

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Abstract Currently, there are quite a large number of various scientific papers on the creation of a controlled asynchronous engine and the optimization of its modes, and the availability of acceptable results for practical implementation, but there is still no single generally accepted approach to solving the problem. In this regard, the issue of synthesis of scalar control systems that provide the minimum value of one or another criterion of energy efficiency is relevant. In this paper, we consider the obtained mathematical model of an asynchronous engine (AE), which differs from the known ones in that the parameters of the substitution scheme are expressed in terms of the stator and rotor conductivities. The energy characteristics of the AE in the sliding function are obtained, which make it possible to determine the dependences of the active and reactive components of the AE current and the possibility of their redistribution within the nominal value of the AE phase current. The principle of optimal frequency-current control of AE is formulated, which differs from the known ones in that, as an energy efficiency indicator, the value of the maximum energy efficiency of AE is used, expressed as the ratio of the active resistance of the rotor circuit to the total conductivity of the AE phase.

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Yerbayev, Yerbol, Ivan Artyukhov, Artem Zemtsov, Denis Artyukhov, Svetlana Molot, Dinara Japarova i Viktor Zakharov. "Negative Impact Mitigation on the Power Supply System of a Fans Group with Frequency-Variable Drive". Energies 15, nr 23 (23.11.2022): 8858. http://dx.doi.org/10.3390/en15238858.

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The technological installations’ characteristics are possible to improve by equipping fans with a frequency-controlled electric drive. However, it can lead to an electromagnetic compatibility problem in the electrical supply system. This problem becomes worse if a large number of fans are included in the technological installation and the electric drives are powered from a substation connected to a limited power source. As an example, in this article we investigate the power supply system of a gas cooling unit with variable-frequency electric drives for fans. The electric drives’ operating mode dependences characterizing the non-sinusoidal voltages and currents of the power source are obtained with the help of simulation modeling in the MATLAB environment with the Simulink expansion package. The typical substation circuit usage for the power supply of a group of fans with a frequency-controlled drive does not meet the requirements of IEEE Standard 519-2014. We can solve the problem of electromagnetic compatibility by changing the substation topology and organizing DC busbars and replacing frequency converters with inverters. We proposed forming DC busbars using 12-pulse rectifiers powered by transformers with two secondary windings with different connection schemes. The simulation results confirmed that the proposed substation topology provides the voltage and current harmonics level on the substation power busbars in accordance with the IEEE Standard 519-2014 requirements over the entire frequency range of the fans’ motor control.

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Han, Qiguo, Kai Zhu, Wenming Shi, Kuayu Wu i Kai Chen. "Research on the supercapacitor support schemes for LVRT of variable-frequency drive in the thermal power plant". IOP Conference Series: Earth and Environmental Science 121 (luty 2018): 042021. http://dx.doi.org/10.1088/1755-1315/121/4/042021.

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Rekha, Mudundi, i Malligunta Kiran Kumar. "Variable frequency drive optimization using torque ripple control and self-Tuning PI controller with PSO". International Journal of Electrical and Computer Engineering (IJECE) 9, nr 2 (1.04.2019): 802. http://dx.doi.org/10.11591/ijece.v9i2.pp802-814.

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Drive’s output power must be restricted for the prevention of stresses over higher components in the input power system while utilizing a three-phase Variable Frequency Drive (VFD) which has powered from a single-phase AC source. To resolve this problem, we introduced a novel motor q-axis current (M-QAC) with torque ripple control (TRC) of an induction motor and self-tuning PI controller with particle swarm optimization (STP-PSO) for mitigating the stress over induction motor by the torque ripple elimination and controlling. Our proposed approach has an information related to the different parts stresses of the VFD which includes the terminal block and the diodes in the input side, DC bus capacitors, torque ripple, harmonics in the current and active performance for sudden changes in the speed and load. Our proposed model is simulated in MATLAB/Simulink environment. In this paper the standard dc-bus voltage ripple-based fold- back, q-axis average current fold-back and q-axis ripple current fold-back methods are utilized for the comparative analysis. Also the comparative analysis of proposed M-QAC, TRC and STP-PSO methodologies are provide with respect to steady-state values of peak-to-peak dc voltage (Vdc), peak-to-peak input current (IINPUT), input RMS current (IRMS), motor speed and the output power. Extensive simulated performance show that the STP-PSO obtained superior results over conventional standard dc-bus voltage ripple-based fold-back method, M-QAC and TRC schemes.

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Hruntovich, N. V., A. A. Kapanski, D. Baczynski, G. V. Vagapov i O. V. Fedorov. "Optimization of a variable frequency drive pump working on a water tower". E3S Web of Conferences 124 (2019): 05060. http://dx.doi.org/10.1051/e3sconf/201912405060.

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The development of the existing water supply system in towns and villages involves the use of frequency converters and specialized control algorithms that can maintain the pressure level established in the supply grid within certain limits. The implementation of the standard scheme includes the elimination of the water tower, which, on the one hand, reduces the cost of its maintenance. On the other hand, in emergency situations, the water tower can still supply water to the consumer, which increases the time of uninterrupted water supply during repairs. The article reveals a method of increasing the energy efficiency of transporting drinking water with the help of a water tower by eliminating the excessive pressure of the water rise when using frequency converters. Our research that involved more than 300 pumping stations, allowed to establish the average value of the excessive pressure of water rise, which reached 0.36 MPa. For the wells under study, optimization of the pump operation modes revealed the energy-saving potential of up to 52% due to excessive pressure reduction and up to 2.0% due to a decrease in starting power at the time of engine acceleration.

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Choi, Yoon-Geol, Hyeon-Seok Lee, Bongkoo Kang, Su-Chang Lee i Sang-Jin Yoon. "Compact Single-Stage Micro-Inverter with Advanced Control Schemes for Photovoltaic Systems". Energies 12, nr 7 (31.03.2019): 1234. http://dx.doi.org/10.3390/en12071234.

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This paper proposes a grid-connected single-stage micro-inverter with low cost, small size, and high efficiency to drive a 320 W class photovoltaic panel. This micro-inverter has a new and advanced topology that consists of an interleaved boost converter, a full-bridge converter, and a voltage doubler. Variable switching frequency and advanced burst control schemes were devised and implemented. A 320 W prototype micro-inverter was very compact and slim with 60-mm width, 310-mm length, and 30-mm height. In evaluations, the proposed micro-inverter achieved CEC weighted efficiency of 95.55%, MPPT efficiency >95% over the entire load range, and THD 2.65% at the rated power. The proposed micro-inverter is well suited for photovoltaic micro-inverter applications that require low cost, small size, high efficiency, and low noise.

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Lipinskis, Tadas, i Vytautas Bleizgys. "EXPERIMENTAL INVESTIGATION OF A SIX-PHASE VARIABLE FREQUENCY DRIVE / ŠEŠIŲ FAZIŲ DAŽNINĖS PAVAROS EKSPERIMENTINIS TYRIMAS". Mokslas – Lietuvos ateitis 8, nr 3 (29.06.2016): 339–44. http://dx.doi.org/10.3846/mla.2016.937.

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Experimental results of a variable frequency drive, consisting of a six-phase voltage source inverter and six-phase asynchronous AC motor are presented in this paper. Frequency converter uses a six-phase space vector PWM scheme created by the author. The voltage forming scheme is implemented in Matlab/Simulink, and logical signals for inverter control are transferred from PC via the National instruments PCI-6024E data acquisition card. Voltages, at which the experimental motor operates at maximum efficiency, were determined experimentally. Motor transitions, when it is operating with one, two, and three failed phase windings are presented, confirming that a six-phase motor can operate with up to three failed windings. Darbe pateikiami dažninės pavaros, sudarytos iš šešių fazių dažnio keitiklio ir šešių fazių asinchroninio elektros variklio, eksperimentinių tyrimų rezultatai. Šešių fazių įtampai formuoti taikomas autoriaus sukurtas erdvinių vektorių moduliacijos algoritmas, naudojantis vidutinio ilgio vektorius. Algoritmas realizuotas asmeniniu kompiuteriu Matlab/Simulink terpėje. Signalams inverterio raktų valdymui iš kompiuterio gauti panaudotas National Instruments PCI-6024E duomenų įvesties/ išvesties įrenginys. Atlikti inverterio įtampos, kuriai esant šešių fazių variklis dirba maksimaliu naudingumo koeficientu, tyrimai. Pateikiami šešių fazių variklio greičio ir sukimo momento pereinamųjų procesų tyrimo rezultatai, esant vienos, dviejų ir trijų variklio apvijų gedimams, patvirtinantys, kad šešių fazių variklis gali ribotai veikti sugedus iki trijų apvijų.

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Soni, Umesh Kumar, i Ramesh Kumar Tripathi. "High Load Fast Startup Sensorless Control of Wheel BLDC Motor with Line-to-Line Back EMF Extraction Using Least Pth-Norm IIR Digital Filter". Journal of Circuits, Systems and Computers 29, nr 09 (19.11.2019): 2050145. http://dx.doi.org/10.1142/s0218126620501455.

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In this paper, an effective scheme of on-load startup with reduced current has been proposed for BLDC motor and the steady as well as dynamic performance in all four quadrants was verified. Hysteresis band-limited back EMF noise provides the starting pulses, the frequency of which depends on the threshold factor in speed proportional threshold. Scheme is quite fast, comparatively to the state-of-the art schemes of startup and less complex than time-consuming initial position detection (IPD) algorithm. Second-order least [Formula: see text]th-norm infinite impulse response (IIR) digital low pass filter realized in MATLAB/Simulink has been used for extraction of line-to line back EMF from line-to-line terminal voltages measured with two voltage sensors. Proposed filter has wide flexibility of online variation of cut-off frequency, gain and phase without any circuit-based modification due to variability of filter coefficients. This enables the smooth filtering with minimized phase delay in low speed range irrespective of any duty cycle and PWM frequency. Linear compensation of phase error or phase advancement for desired current profile can easily be achieved by the varying the threshold factor. In this experiment, the threshold factor of 1/1460 has been found most suitable for smooth sensorless startup without jerk, vibration and reverse rotation, as the motor operates in advanced mode with this value. First, the performance of Hall sensor-based drive was studied using open loop variable duty cycle speed control. The controller was designed in MATLAB/Simulink platform and implemented using TMS320F28069M DSP control stick with Code composer Studio V5. Later on, a complete controller for proposed sensorless scheme was developed in MATLAB/Simulink environment and was implemented using NI-PCI6221 Controller installed in PC. The proposed sensorless drive has been found capable of operating at very low speed of 50[Formula: see text]rpm in voltage control mode and 85[Formula: see text]rpm in current chopping PWM mode. Approximately 85[Formula: see text]ms less time was taken by sensorless drive to reach the same speed when compared with Hall-based control for identical loading. Also less overshoots during startup was observed. Overlap time of 0.05[Formula: see text]ms between phase currents has been achieved during commutation period.

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Rozprawy doktorskie na temat "Variable frequency drive schemes"

Schad, Judah, Cameron Nichols i Katelyn Brinker. "Permanent Magnet Synchronous Motor Variable Frequency Drive System". International Foundation for Telemetering, 2017. http://hdl.handle.net/10150/627008.

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This paper discusses a permanent magnet synchronous motor (PMSM) variable frequency drive (VFD) system developed for an all-terrain Wifi-HaLow connected (802.11ah, 900 MHz) modular electric vehicle that competed in the Mars University Rover Challenge (URC). The quadrature axis flux linkage for each motor was estimated using on-board voltage and current measurements. A synchronous control algorithm tracked the electromagnetic operating parameters, which are highly dependent on variations in motor construction and load conditions. A feed-forward model-driven observer solution calculated flux linkage angles by direct-quadrature-zero transformation of three-phase shunt currents using DSP processors.

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Patel, Sagarkumar. "Speed Control of Three-Phase Induction Motor Using Variable Frequency Drive". Thesis, California State University, Long Beach, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10690223.

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There are various methods for speed control of induction motors. This paper specifically describes one of the methods: speed control using variable frequency. The proposed system is a MATLAB simulink model, which is a closed loop model designed to achieve desired speed control of a three-phase induction motor by varying its frequency. The simulink model has four main blocks, namely the inverter, synchronous machine, proportional integral control and current hysteresis control. For accuracy of output results and simplicity, we have used dq to abc transformation block and sin function block. The inverter is comprised of six integrated gate bipolar transistors (IGBTs), which are fired by gate pulses generated by current hysteresis control block. The inverter generates variable frequency and variable voltage output, which is given to motor terminals. The project presents the working principle of variable frequency drive (VFD), its performance, and the use of Pulse Width Modulation (PWM) in a three-phase inverter to control the frequency and thus the speed. The proposed method conformed to performance predictions and delivered the desired outputs.

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Delaney, Eamon John. "Harmonic and interharmonic current distortion in variable frequency synchronous motor drives". Thesis, Staffordshire University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282140.

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Gibson, Richard Samuel. "Reduction of variable speed drive IGBT switching loss, utilising the IGBT gate drive, without increasing radio frequency radiated emissions". Thesis, University of Newcastle upon Tyne, 2013. http://hdl.handle.net/10443/2427.

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Radio frequency radiated emission from a variable speed drive must be limited below defined limits to avoid interference with electronic equipment. It is possible to comply with the international standards however, the current state of the art methods such as large gate drive resistance and output filters significantly reduce the efficiency or increase the cost of the products. It is known that the main source of emissions emanate from the switching transients associated with the output power semiconductors, however the exact mechanisms and specific sources are unknown. This thesis examines the interaction of power devices during the switching transient identifying features which can be controlled by a sophisticated gate drive design. Analysis of the frequency content of the signals is presented together with methods to minimise power losses while maintaining compliance with radiated emission standards. A research program has been undertaken to identify the sources responsible for radiated emissions and predict a figure of merit as an indication of compliance. Measuring radio frequency content on high voltage and current signals is difficult and several techniques to accurately achieve this are presented. Simple passive gate drive solutions which can be easily implemented are examined along with a discussion on more complicated optimised solutions.

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Van, Wiltenburg Philip E. "Mitigation of EMI generated by a variable frequency drive controller for an AC induction motor". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1994. http://handle.dtic.mil/100.2/ADA286045.

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Pan, Jianyu. "Control of Four-Level Hybrid Clamped Converter for Medium-Voltage Variable-Frequency Drives". The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1562943204567575.

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Achelpohl, Scott Alan. "Analysis of an Existing Coal Fired Power Generation Facility with Recommendations for Efficiency and Production Improvement". OpenSIUC, 2010. https://opensiuc.lib.siu.edu/theses/378.

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This study examined the Lake of Egypt Power Plant operated by Southern Illinois Power Cooperative located on the Lake of Egypt south of Marion, IL. The facility has a 173 MW rated turbine operating on a pulverized coal cyclone boiler and three 33 MW rated turbines operating on an oversized circulating fluidized bed boiler with 120 MW capacity. The first area examined was reduction of auxiliary power consumption possible with the addition of variable frequency drives to the forced draft fan and booster fan motors. Included in this examination was an analysis of the economic and environmental impact of such a reduction. From the analysis an annual savings of 24.4 GWh of electricity is possible. The second area examined was the generation capacity lost due to condenser fouling and the possible reduction in facility emissions with altered condenser treatment. From the analysis an additional 3.0 MW of capacity facility wide is possible or a reduction steam production of 1.5% for each boiler.

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Halilovic, Amer. "Experimental Transient Behaviour Characterisation of Induction Motor fed by Variable Frequency Drives for Pump Applications". Thesis, KTH, Elektrisk energiomvandling, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-157319.

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The use of variable frequency drives in centrifugal pump applications has raised the question of how to select a drive. Clogging obstacles in waste water applications create unknown transient loads for the pump system. A sudden load increase occurrence can clog the pump if the drive cannot supply enough current to reach the motor’s torque demand. In order to select a suitable drive, an empirical approach has been implemented, investigating three different drives. Results have shown that selecting a drive with the highest possible overload capabilities, even if for a short time is most suitable. Operation in vector speed control gives the most reliable operation if an automatic parameter tuning is performed by the drive.
Användningen av frekvensomriktare i centrifugalpumpar har väckt fr ågan om hur en omriktare skall väljas. Igensättande objekt i avloppsvatten kan ge upphov till transienta laster i pumpsystemen. En oförutsedd lastökning kan sätta igen pumpen om frekvensomriktaren inte kan förse motorn tillräckligt med ström för att möta momentbehovet. För att välja en lämplig omriktare har ett empiriskt tillvägag ångssätt valts i en undersökning av tre olika omriktare. Resultat har visat att det är lämpligast att välja en omriktare med högst överbelastningskapacitet, även om under en kort tid. Vektor hastighetskontroll är metoden som ger stabil körning om omriktaren f ått automatiskt ställa in motorparametrarna.

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Su, Heyin. "Modeling of Proposed Changes to SIUC Central Heating, Air-Conditioning, and Power Plant Incorporating Variable Frequency Drive (VFD) and High Efficiency Turbine". OpenSIUC, 2011. https://opensiuc.lib.siu.edu/theses/708.

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Currently, the Southern Illinois University Carbondale (SIUC) power plant produces steam at high pressure to drive a high pressure (HP) turbine to make a portion of the electrical power needed by campus, then using 969 kPa (125 psig) steam to provide hot water all year, heat buildings, and to operate a low pressure (LP) turbine that powers the compressor of the central air conditioning (A/C) system. In the proposed system, the HP turbine is replaced by a much higher efficiency, multi-level turbine, the LP turbine is replaced with a motor and Variable Frequency Drive (VFD), and a cooling tower is added to condense more possible steam. This thesis has provided computer models to evaluate the economical feasibility of the proposed system, which are written by using Engineering Equation Solver (EES) software. The results of the study are presented in two cases. Case 1 examines the same amount of coal use between current and proposed systems, while Case 2 exames operating the high pressure boiler at the maximum rate. The results are a cost savings of $1,921,000 and $3,604,000 with payback periods of 4 and 2.2 years for Case 1 and Case 2, respectively. The annual primary energy saved and CO2 reduction from this modification was 200,000 GJ and 564,814 moles, respectively.

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Ruckdaschel, James David. "Harmonic Analysis of a Static VAR Compensated Mixed Load System". DigitalCommons@CalPoly, 2009. https://digitalcommons.calpoly.edu/theses/82.

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As power electronic based controllers and loads become more prevalent in power systems, there is a growing concern about how the harmonics generated by these controllers and loads affect the power quality of the system. One widely used power electronic based load is the Variable Frequency Drive (VFDs) used to vary the speed of an induction motor; whereas a common example of a power electronic based controller used in power systems is the Static VAR Compensator (SVC) for improving a system’s power factor. In this thesis, the harmonic content and overall performance of a system including both a VFD and a SVC will be studied and analyzed. Specifically, the cases of no compensation, static capacitor compensation, and power electronic based static VAR compensation are examined. A small-scale model of a system for study was constructed in lab. Several cases were then performed and tested to simulate a system which contained both fixed and power electronic based harmonic generating loads. The performance of each case was determined by total harmonic current and voltage distortions, true power factor, and RMS current levels at different points in the system.

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Książki na temat "Variable frequency drive schemes"

Variable frequency AC motor drive systems. London, U.K: P. Peregrinus on behalf of the Institution of Electrical Engineers, 1988.

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Finney, David. Variable frequency AC motor drive systems. London: Peregrinus, 1988.

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Ballantine, Arne. Fuel Cell System with Variable Frequency Drive for Support Equipment: United States Patent 9972852. Independently Published, 2020.

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Części książek na temat "Variable frequency drive schemes"

Franchi, Claiton Moro. "Variable Frequency Drive Sizing and Applications". W Electrical Machine Drives, 333–51. Boca Raton : Taylor & Francis, a CRC title, part of the Taylor & Francis imprint, a member of the Taylor & Francis Group, the academic division of T&F Informa, plc, 2018.: CRC Press, 2019. http://dx.doi.org/10.1201/b22314-10.

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Badri, Bechir, Marc Thomas i Sadok Sassi. "Variable Drive Frequency Effect on Spindle Dynamic Behavior in High Speed Machining". W Condition Monitoring of Machinery in Non-Stationary Operations, 547–54. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-28768-8_56.

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Bharani, G., S. Dineshkumar, M. Elango, U. Harshavarshini i G. Karthick. "MF-Based Load Sharing System for Paper Rolling Mill Using Variable Frequency Drive". W Studies in Autonomic, Data-driven and Industrial Computing, 201–9. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-2768-5_18.

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Nahin, Nazmul Islam, Shuvra Prokash Biswas i Md Rabiul Islam. "A Modified SVPWM Strategy to Improve the Performance of Variable Frequency Induction Motor Drive". W Lecture Notes in Electrical Engineering, 481–93. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1742-4_41.

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Ramesh, P., R. Govarthanan, K. Palanisamy i S. Paramasivam. "Analysis of Grid Parameter Variation with Renewable Energy Sources on Variable Frequency Drive DC Capacitor Reliability". W Lecture Notes on Multidisciplinary Industrial Engineering, 261–72. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-7968-0_20.

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Nirmala, M., R. Latha i G. Thenmozhi. "Design and Implementation of an Intelligent Health Monitoring System for Variable Frequency Drive in Manufacturing Industry". W Sixth International Conference on Intelligent Computing and Applications, 551–63. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-1335-7_49.

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Kadyrov, Ishembek, Nurzat Karaeva, Zheenbek Andarbekov i Kyyal Kadyrkulova. "Features of Designing a Variable-Frequency Electric Drive Control System with a Microprocessor-Based Sinusoidal Signal Generator". W Communications in Computer and Information Science, 201–17. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-66895-2_13.

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"Variable Frequency Drive Systems". W Energy Production Systems Engineering, 441–66. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119238041.ch18.

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Li, Yunhua. "Variable Frequency Drive Applications in HVAC Systems". W New Applications of Electric Drives. InTech, 2015. http://dx.doi.org/10.5772/61782.

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Streszczenia konferencji na temat "Variable frequency drive schemes"

Ramirez, Oscar, i Ting Yu. "Variable Frequency Drive Applications and Their Electrical Protection Scheme for Liquids Pipelines". W 2012 9th International Pipeline Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ipc2012-90339.

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Motor and pump units can start either directly across the line (utility) or through a VFD. If the power system is weak (high impedance and relatively low available MVA), the result will be limitations on the maximum size of motor that may be started directly across the line. Currently some available power systems are not capable of starting large motors across the line and therefore VFD systems are required. A VFD can be used for starting purposes or to operate a motor/pump unit (unit) continuously. Liquids pipelines have been using VFDs for unit starting purposes and for pressure control while either one of the units connected to the VFD or while there is a dedicated VFD per unit. One VFD can be used to operate all the units. The VFD starts the motor, ramps it up, and synchronizes it with the utility to switch the motor from VFD operation to utility operation. The VFD follows the same sequence with the next unit. The VFD also switches the motor from utility operation to VFD operation. With pumps in series, one unit can remain connected to the VFD for pressure control in liquids pipelines. Each unit can also be controlled by a dedicated VFD, allowing independent control of each unit for start-up and speed control. Both single VFD or dedicated VFD per unit offer advantages. Benefits of using a single VFD for all units are cost savings for some applications, a backup start across the line when allowed by the power system, and station pressure control. The benefits of a dedicated VFD per unit application include more flexibility in flow and pressure control, ease of expansion without interrupting existing operations for an extended period, energy efficiency, and redundancy. Motor protection schemes for the above two VFD applications are discussed and compared in this paper. In order to maintain a safe and reliable pipeline system, comprehensive motor protection functions are provided to the pump unit. Although the principles are the same, there are some differences between the two motor protection applications. For a dedicated VFD per unit application, the VFD protection/control circuitry normally provides motor protection because the motor is always connected to the VFD. RTDs over-temperature protection is not typically a standard feature of VFDs, however, it can be provided by proper PLC programming or the VFD incoming feeder protection relay.

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Najmabadi, Ali, Michael Kress, Brett Dryer i Ahmad Arshan Khan. "Effect of the Variable Switching Frequency and DPWM Switching Schemes on the Losses of Traction Drives". W WCX™ 17: SAE World Congress Experience. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2017. http://dx.doi.org/10.4271/2017-01-1227.

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Zhou, Jingli, Sheng Sheng Yu i Joseph T. Ma. "Design of Servo Code and Synchronous Clock Writing Scheme on a High Capacity Disk Drive". W ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-0582.

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Abstract A disk drive servo code and synchronous writing scheme is described in this paper. The encoding and decoding of the servo code; the writing and detecting of the synchronous clock writing can be realized in this system. In this paper, a synchronous clock writing with variable frequency method is discussed. The mathematical analysis of the variable frequency clock writing, the system design, and the writing and detecting of the servo code are presented.

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Okuno, A. "Latest developments of voltage-fed resonant high-frequency inverter with load resonant frequency tracking scheme for induction heating". W Seventh International Conference on Power Electronics and Variable Speed Drives. IEE, 1998. http://dx.doi.org/10.1049/cp:19980516.

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Su, Chun-Hsi, i Yian-Ting Chen. "A Remote-Controllable Variable Frequency Drive". W 2023 Sixth International Symposium on Computer, Consumer and Control (IS3C). IEEE, 2023. http://dx.doi.org/10.1109/is3c57901.2023.00084.

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Serhiienko, Serhii, i Oksana Khrebtova. "Starting torque of variable frequency electric drive". W 2017 International Conference on Modern Electrical and Energy Systems (MEES). IEEE, 2017. http://dx.doi.org/10.1109/mees.2017.8248862.

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Ivanova, V. R., i I. Yu Ivanov. "Efficiency of Introduction of Variable Frequency Drive". W 2020 International Multi-Conference on Industrial Engineering and Modern Technologies (FarEastCon). IEEE, 2020. http://dx.doi.org/10.1109/fareastcon50210.2020.9271325.

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Savosteenko, Nikita V., Artyom A. Gryzlov, Evgeny S. Khayatov i Sergey P. Gladyshev. "Electrical motor of modern variable-frequency drive". W 2017 IEEE Conference of Russian Young Researchers in Electrical and Electronic Engineering (EIConRus). IEEE, 2017. http://dx.doi.org/10.1109/eiconrus.2017.7910723.

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Mahmoud, Gamal, Mahmoud Masoud i Ibrahim El-Arabawy. "Inverter Faults In Variable Voltage Variable Frequency Induction Motor Drive". W 2007 Compatibility in Power Electronics. IEEE, 2007. http://dx.doi.org/10.1109/cpe.2007.4296531.

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Rao, A. Koteswara, Shoubhik Mukherjee, G. Santhosh Kumar, G. Balawanth Reddy, S. Eswara Rao, B. P. Muni, Jose Titus, Vamsikrishna M, Kamalesh Hatua i Krishna Vasudevan. "Development and testing of 1MW variable frequency drive". W 2016 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES). IEEE, 2016. http://dx.doi.org/10.1109/pedes.2016.7914322.

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Raporty organizacyjne na temat "Variable frequency drive schemes"

Laloudakis, D. J. Variable frequency drive applications guide. Office of Scientific and Technical Information (OSTI), październik 1991. http://dx.doi.org/10.2172/10105595.

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Laloudakis, D. J. Variable frequency drive applications guide. Office of Scientific and Technical Information (OSTI), październik 1991. http://dx.doi.org/10.2172/6997225.

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Romberger, J. Chapter 18: Variable Frequency Drive Evaluation Protocol. Office of Scientific and Technical Information (OSTI), listopad 2014. http://dx.doi.org/10.2172/1164875.

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Norad. PR-015-09205-E01 Assessment of Variable Frequency and Variable Speed Drives for Pipeline Pump Applications. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), sierpień 2010. http://dx.doi.org/10.55274/r0010718.

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Adjustable speed drive systems for pipeline pump applications have enabled variable speed pumping as a means of reliable capacity control. Through a number of case studies, these systems have proven to be as reliable as operating multiple pumps with a discharge control valve or recycling flow to reach the desired capacity variations. Adjustable speed drive installations offer a potential savings in energy efficiency compared to operating pumps in recycle or throttling at a constant speed, especially for installations where a large turndown is required to meet demand variations. As energy costs become more critical, more consideration may need to be given to the energy efficiency gains through variable speed pumping. This is a literature review and includes a lifecycle cost analysis spreadsheet.

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Romberger, Jeff. Chapter 18: Variable Frequency Drive Evaluation Protocol. The Uniform Methods Project: Methods for Determining Energy Efficiency Savings for Specific Measures. Office of Scientific and Technical Information (OSTI), czerwiec 2017. http://dx.doi.org/10.2172/1365710.

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