Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Research on grid-connected harmonic current suppression of three-phase four-wire energy storage inverters

  • Hongyang Qing (Key Laboratory of Power Electronics for Energy Conservation and Motor Drive of Hebei Province, School of Electrical Engineering, Yanshan University) ;
  • Chunjiang Zhang (Key Laboratory of Power Electronics for Energy Conservation and Motor Drive of Hebei Province, School of Electrical Engineering, Yanshan University) ;
  • Xiuhui Chai (Intelligent Manufacturing College, Tianjin Sino-German University of Applied Sciences) ;
  • Hao He (Key Laboratory of Power Electronics for Energy Conservation and Motor Drive of Hebei Province, School of Electrical Engineering, Yanshan University) ;
  • Xiaohuan Wang (Key Laboratory of Power Electronics for Energy Conservation and Motor Drive of Hebei Province, School of Electrical Engineering, Yanshan University)
  • Received : 2022.06.09
  • Accepted : 2023.01.19
  • Published : 2023.06.20
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Abstract

When a three-phase four-wire grid-connected energy storage inverter is connected to unbalanced or single-phase loads, a large grid-connected harmonic current is generated due to the existence of a zero-sequence channel. A controller design approach for grid-connected harmonic current suppression is proposed based on proportion-integral-repetitive (PI-repetitive) control for a three-level neutral point clamped (3L-NPC) three-phase four-wire inverter. By designing the variable parameters n (gain coefficient of the PI controller) and Qs (gain of the repetitive controller), the effect of the PI-repetitive controller gain on current harmonic suppression is analyzed using a three-dimensional amplitude gain curve. A simplified impedance model in the d0-frame for a three-phase four-wire inverter is proposed. Based on the impedance model in the d0-frame, the system stability is analyzed under different PI-repetitive control gains by the generalized Nyquist criterion. Finally, the optimal controller design is obtained by a gain characteristic and system stability analysis. The controller obtained by this harmonic suppression analysis method can simultaneously ensure the best grid-connected current quality of the three-phase four-wire inverter and the dynamic stability of the system. Simulation and experimental results verify the effectiveness and correctness of the proposed controller design approach for grid-connected harmonic current suppression.

Keywords

Acknowledgement

This work was supported by the Hebei Provincial Graduate Innovative Funding Project in 2021 (Grant No. CXZZBS2021139) and the National Natural Science Foundation of China (Grant Nos. 51877187 and 52077191).

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