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This paper presents a shunt active power filter connected to the grid via an LCL coupling circuit with implemented closed-loop control. The proposed control system allows selective harmonic currents compensation up to the 50th harmonic with the utilization of a model-based predictive current controller. As the system is fully predictive, it provides high effectiveness of the harmonic reduction, which is proved by waveforms achieved in performed tests. On the other hand, the control system is prone to loss of stability. Therefore, the paper is focused on the stability analysis of the discussed control system with the additional outer control loop of the supply current with predictive control of this current. The conducted stability analysis encompasses the assessment of system stability as a function of the coupling circuit parameter identification accuracy, whose values are implemented in the current controller, as well as parameters such as the sampling frequency and proportional-integral (PI) controller coefficients. The obtained results show that the ranges of the LCL circuit parameter identification accuracy for which the system remains stable are relatively wide. However, the most effective compensation of the supply current distortion is achieved for the parameters identified correctly, and the greatest impact on the compensation quality has the value of L1 inductance.
Agata Bielecka; Daniel Wojciechowski. Stability Analysis of Shunt Active Power Filter with Predictive Closed-Loop Control of Supply Current. Energies 2021, 14, 2208 .
AMA StyleAgata Bielecka, Daniel Wojciechowski. Stability Analysis of Shunt Active Power Filter with Predictive Closed-Loop Control of Supply Current. Energies. 2021; 14 (8):2208.
Chicago/Turabian StyleAgata Bielecka; Daniel Wojciechowski. 2021. "Stability Analysis of Shunt Active Power Filter with Predictive Closed-Loop Control of Supply Current." Energies 14, no. 8: 2208.
The paper proposes the adaptation of the industrial plant’s power network to supply electric vehicle (EV) fast-charging converters (above 300 kW) using renewable energy sources (RESs). A 600 V DC microgrid was used to supply energy from RESs for the needs of variable speed motor drives and charging of EV batteries. It has been shown that it is possible to support the supply of drive voltage frequency converters (VFCs) and charging of EV batteries converters with renewable energy from a 600 V DC microgrid, which improves the power quality indicators in the power system. The possibility of implementing the fast EV batteries charging station to the industrial plant’s power system in such a way that the system energy demand is not increased has also been shown. The EV battery charging station using the drive converter has been presented, as well as the results of simulation and laboratory tests of the proposed solution.
Jerzy Ryszard Szymanski; Marta Zurek-Mortka; Daniel Wojciechowski; Nikolai Poliakov. Unidirectional DC/DC Converter with Voltage Inverter for Fast Charging of Electric Vehicle Batteries. Energies 2020, 13, 4791 .
AMA StyleJerzy Ryszard Szymanski, Marta Zurek-Mortka, Daniel Wojciechowski, Nikolai Poliakov. Unidirectional DC/DC Converter with Voltage Inverter for Fast Charging of Electric Vehicle Batteries. Energies. 2020; 13 (18):4791.
Chicago/Turabian StyleJerzy Ryszard Szymanski; Marta Zurek-Mortka; Daniel Wojciechowski; Nikolai Poliakov. 2020. "Unidirectional DC/DC Converter with Voltage Inverter for Fast Charging of Electric Vehicle Batteries." Energies 13, no. 18: 4791.
In the article, a new method to improve the accuracy of the insulated-gate bipolar transistor (IGBT) junction temperature computations in the piecewise linear electrical circuit simulation (PLECS) software is proposed and described in detail. This method allows computing the IGBT junction temperature using a nonlinear compact thermal model of this device in PLECS. In the method, a nonlinear compact thermal model of the IGBT is used, which considers the dependence of thermal resistance on the junction temperature. The usefulness of the method is experimentally verified, and it is confirmed that it increases the accuracy of the computations and shortens their time. The differences between the measured and computed characteristics are discussed. The application of the developed method for computations resulted in a significant reduction of their error to only a few percent. The developed method can be applied in the system-level simulations of the power electronics converters.
Pawel Gorecki; Daniel Wojciechowski. Accurate Computation of IGBT Junction Temperature in PLECS. IEEE Transactions on Electron Devices 2020, 67, 2865 -2871.
AMA StylePawel Gorecki, Daniel Wojciechowski. Accurate Computation of IGBT Junction Temperature in PLECS. IEEE Transactions on Electron Devices. 2020; 67 (7):2865-2871.
Chicago/Turabian StylePawel Gorecki; Daniel Wojciechowski. 2020. "Accurate Computation of IGBT Junction Temperature in PLECS." IEEE Transactions on Electron Devices 67, no. 7: 2865-2871.