三相并网逆变器频率耦合机理分析及稳定性判定

ZOU Xiaoming

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三相并网逆变器频率耦合机理分析及稳定性判定

更新时间：2025-08-13

- 三相并网逆变器频率耦合机理分析及稳定性判定
- Automation of Electric Power Systems Vol. 42, Issue 18, Pages: 57-63(2018)
- 作者机构：
  
  输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆市,400044
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2018
- 稿件说明：
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ZOU Xiaoming. [J]. Automation of electric power systems, 2018, 42(18): 57-63.
DOI：

ZOU Xiaoming. [J]. Automation of electric power systems, 2018, 42(18): 57-63. DOI：

摘要

并网逆变器中控制器dq轴结构或参数的不对称会导致系统在静止坐标系下存在两个扰动频率分量相互耦合，这一耦合因素会影响系统的稳定性。文中分析了系统中这两个扰动频率的耦合机理，分别得到了两个耦合频率下的逆变器等效导纳。利用这两个导纳，采用奈奎斯特判据判定了并网逆变器系统的稳定性，相比现有采用广义奈奎斯特判据的方法，稳定性判定过程简单，便于给出系统稳定裕量，指导逆变器控制器设计。实验验证了并网逆变器系统稳定性判定结果的正确性。

Abstract

The asymmetric dq-axis structure or parameters of the controller in the grid-connected inverter will cause the coupling between two disturbed frequency components of the system in the static frame. This coupling factor will affect the stability of the power system. This paper analyzes the mechanism of frequency coupling

and derives the equivalent admittance of inverter under the two coupling frequency components. By using the two equivalent admittances

the stability of the grid-connected inverter system can be judged by the Nyquist criterion. Compared with the approaches using the generalized Nyquist criterion

the stability judgement process of the proposed method is simpler. By using this method

it is convenient to obtain the phase margin or gain margin of the system and guide the controller design. Finally

the correctness of the stability judgement results is verified through experiments.

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