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Artykuły w czasopismach na temat "Variable frequency drive schemes"
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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, no. 3 (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., and Akhtar Kalam. "Comparative Study of Grid Frequency Stability Using Flywheel-Based Variable-Speed Drive and Energy Capacitor System." Energies 16, no. 8 (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, and L. A. Panteleeva. "Energy-efficient variable frequency asynchronous electric drive." Journal of Physics: Conference Series 2061, no. 1 (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, et al. "Negative Impact Mitigation on the Power Supply System of a Fans Group with Frequency-Variable Drive." Energies 15, no. 23 (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, and 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 (February 2018): 042021. http://dx.doi.org/10.1088/1755-1315/121/4/042021.
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Rekha, Mudundi, and 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, no. 2 (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, and 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, and Sang-Jin Yoon. "Compact Single-Stage Micro-Inverter with Advanced Control Schemes for Photovoltaic Systems." Energies 12, no. 7 (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, and Vytautas Bleizgys. "EXPERIMENTAL INVESTIGATION OF A SIX-PHASE VARIABLE FREQUENCY DRIVE / ŠEŠIŲ FAZIŲ DAŽNINĖS PAVAROS EKSPERIMENTINIS TYRIMAS." Mokslas – Lietuvos ateitis 8, no. 3 (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, and 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, no. 09 (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.