并网逆变器的阻抗自适应控制方法

DU Yan

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并网逆变器的阻抗自适应控制方法

更新时间：2025-08-13

- 并网逆变器的阻抗自适应控制方法
- Automation of Electric Power Systems Vol. 42, Issue 6, Pages: 120-127(2018)
- 作者机构：
  
  合肥工业大学电气与自动化工程学院,安徽省,合肥市,230009
- 作者简介：
- 基金信息：
- DOI：
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- Published：2018
- 稿件说明：
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DU Yan. [J]. Automation of electric power systems, 2018, 42(6): 120-127.
DOI：

DU Yan. [J]. Automation of electric power systems, 2018, 42(6): 120-127. DOI：

摘要

弱电网下，含电网电压前馈控制的并网逆变器和电网之间的阻抗交互作用，可能导致并网电流谐波放大甚至系统失稳。分析了输出阻抗特性，以提高逆变器与电网之间的稳定相角裕度为目标，提出了基于并网电流微分和电网电压微分的串、并联复合阻抗校正方法；讨论了微分系数对相角提升的灵敏度，给出了一种自适应调整的微分系数设计方法。该方法使得并网系统在电网阻抗宽范围变化时均能稳定运行，同时提高了并网系统对电网电压的抗扰性能。实验结果验证了所提控制方法的有效性。

Abstract

In the condition of a weak grid

the interaction between the grid-connected inverters and the grid might directly lead to the instability of inverters especially for those inverters with grid-voltage feedforward controllers. A serial-parallel impedance reshaping controller is proposed to improve the phase margin at the intersected frequency between the inverter and the grid after analyzing the output impedance characteristics. Moreover

a self-adjusting differential coefficient design method is presented as well after discussing the sensitivity of the differential coefficient to the phase enhancement. With this proposed controller

the system stability and the robustness against grid-voltage-harmonics are improved. The experimental results verify the effectiveness of the proposed control method.

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