Research on LVRT Control Strategy of Photovoltaic System Based on Hybrid Control Algorithm

doi:10.11930/j.issn.1004-9649.201911060

Abstract

Abstract: A low voltage ride-through (LVRT) control strategy of photovoltaic (PV) system based on a hybrid control algorithm is proposed to solve the problems of DC-link overvoltage and AC side overcurrent of grid-connected inverter when the power grid voltage drops. Firstly, based on model current prediction control, the inverter grid-connected current can quickly follow the reference instruction and the symmetrical current can be always obtained to solve AC side overcurrent problem in the case of symmetric and asymmetric faults. Secondly, based on the voltage sag of the point of common coupling (PCC) and the adaptive non maximum power point tracking (Non-MPPT) algorithm to adjust Boost converter's duty ratio, the output power of PV array can be reduced, so that DC-link overvoltage can be inhibited in the failure process which is caused by the power imbalance between AC and DC side of the grid-connected inverter. By introducing DC-link voltage feedback, the second harmonic component of DC-link voltage can be removed in the asymmetric fault condition. Finally, the correctness and effectiveness of algorithm proposed are verified by Matlab/Simulink simulation system.

Key words: two-stage PV power generation system, hybrid algorithm, model current prediction control, Non-MPPT algorithm, LVRT

YANG Chunbo, WANG Jingjing, KANG Peng, ZENG Linfeng, ZHENG Feng. Research on LVRT Control Strategy of Photovoltaic System Based on Hybrid Control Algorithm[J]. Electric Power, 2020, 53(3): 18-27,58.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201911060

https://www.electricpower.com.cn/EN/Y2020/V53/I3/18

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