Inverter current control strategy under three-phase voltage unbalance condition

Bin Guo; Guochu Chen

doi:10.1117/12.2690128

10 August 2023 Inverter current control strategy under three-phase voltage unbalance condition

Bin Guo, Guochu Chen

Proceedings Volume 12748, 5th International Conference on Information Science, Electrical, and Automation Engineering (ISEAE 2023); 127484R (2023) https://doi.org/10.1117/12.2690128
Event: 5th International Conference on Information Science, Electrical and Automation Engineering (ISEAE 2023), 2023, Wuhan, China

Abstract

In this paper, a grid-connected inverter control strategy based on closed-loop control of grid-side currents of grid-connected inverters when the three-phase voltages are balanced is proposed to improve the quality of grid-side current waveforms of grid-connected inverters under three-phase voltage unbalance conditions. The positive and negative sequence current separation control is also performed. The mathematical model of the L-filtered three-phase grid-connected inverter in twophase rotating coordinate system is analyzed and derived, the phase-locked loop based on the dual-synchronous DQ rotating coordinate system and the T/4 delayed phase elimination (DSC) principle are introduced, and the four-current closed-loop controller based on the positive and negative sequence separation is designed. A simulation model of the system is established based on Simulink, and the simulation results verify that the control strategy can effectively control the negative sequence current on the grid side and improve the output current waveform on the grid-connected inverter grid side.

Citation Download Citation

Bin Guo and Guochu Chen "Inverter current control strategy under three-phase voltage unbalance condition", Proc. SPIE 12748, 5th International Conference on Information Science, Electrical, and Automation Engineering (ISEAE 2023), 127484R (10 August 2023); https://doi.org/10.1117/12.2690128

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