Research on grid‑connected harmonic current suppression of three‑phase four‑wire energy storage inverters

Hongyang Qing; Chunjiang Zhang; Xiuhui Chai; Hao He; Xiaohuan Wang

Research on grid‑connected harmonic current suppression of three‑phase four‑wire energy storage inverters

Vol. 23, No. 6, pp. 972-983, Jun. 2023

10.1007/s43236-023-00601-7

Three-phase four-wire inverter

Energy storage

Proportion–integral–repetitive control

Harmonic current suppression

Stability analysis

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 coeffi cient of the PI controller) and Qs (gain of the repetitive controller), the eff ect of the PI–repetitive controller gain on current harmonic suppression is analyzed using a three-dimensional amplitude gain curve. A simplifi ed impedance model in the d 0-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 diff erent 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.

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Cite this article

[IEEE Style]

H. Qing, C. Zhang, X. Chai, H. He, X. Wang, "Research on grid‑connected harmonic current suppression of three‑phase four‑wire energy storage inverters," Journal of Power Electronics, vol. 23, no. 6, pp. 972-983, 2023. DOI: 10.1007/s43236-023-00601-7.

[ACM Style]

Hongyang Qing, Chunjiang Zhang, Xiuhui Chai, Hao He, and Xiaohuan Wang. 2023. Research on grid‑connected harmonic current suppression of three‑phase four‑wire energy storage inverters. Journal of Power Electronics, 23, 6, (2023), 972-983. DOI: 10.1007/s43236-023-00601-7.