基于并网电流谐波反馈的有源阻尼策略

doi:10.11930/j.issn.1004-9649.202303004

摘要/Abstract

摘要： 以并网点电压谐波为反馈量的有源阻尼控制（voltage-harmonic-based active damping，VHBAD）可提高变流器对弱电网的适应能力，但会削弱系统对背景谐波电压扰动的抑制能力，影响并网电流质量。首先，建立了弱电网下并网变流器的数学模型，分析了电网等值电感对系统稳定性的影响；进而提出一种基于并网电流谐波反馈的有源阻尼策略（current-harmonic-based active damping，CHBAD），该策略将有源阻尼支路的作用点由参考信号移至调节器输出端，可在提高变流器弱电网适应能力的同时兼顾到并网电流质量。最后，通过Plecs仿真软件搭建仿真模型，时域仿真结果与理论分析一致，验证了该策略的有效性。

关键词: 弱电网, 并网变流器, 背景谐波电压, 有源阻尼, 稳定性

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

徐佳, 杨树德, 张新闻. 基于并网电流谐波反馈的有源阻尼策略[J]. 中国电力, 2023, 56(8): 126-135.

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

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

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