Current-Harmonic-Based Active Damping Strategy

doi:10.11930/j.issn.1004-9649.202303004

Abstract

Abstract: The voltage-harmonic-based active damping control (VHBAD) can improve the adaptability of the converter to the weak grid, but it will weaken the suppression ability of background harmonic voltage disturbance and affect the quality of grid-connected current. For this reason, the mathematical model of the grid-connected converter to the weak grid is established first, and the influence of the grid equivalent inductance on the system stability is analyzed. Then, a current-harmonic-based active damping (CHBAD) strategy is proposed. This strategy moves the action point of the active damping branch from the reference signal to the output of the regulator, which can improve the adaptability of the converter to the weak grid and ensure the quality of grid-connected current. Finally, the simulation model is built by simulation software, namely Plecs, and the time domain simulation results are consistent with the theoretical analysis, which verifies the effectiveness of the strategy.

Key words: weak grid, grid-connected converter, background harmonic voltage, active damping, stability

XU Jia, YANG Shude, ZHANG Xinwen. Current-Harmonic-Based Active Damping Strategy[J]. Electric Power, 2023, 56(8): 126-135.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202303004

https://www.electricpower.com.cn/EN/Y2023/V56/I8/126

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