弱电网下远端严重电压跌落时逆变器并网失稳机理分析

YUAN Hui

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弱电网下远端严重电压跌落时逆变器并网失稳机理分析

更新时间：2025-08-13

- 弱电网下远端严重电压跌落时逆变器并网失稳机理分析
- Automation of Electric Power Systems Vol. 42, Issue 22, Pages: 38-43(2018)
- 作者机构：
  
  浙江大学电气工程学院,浙江省,杭州市,310027
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2018
- 稿件说明：
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YUAN Hui. [J]. Automation of electric power systems, 2018, 42(22): 38-43.
DOI：

YUAN Hui. [J]. Automation of electric power systems, 2018, 42(22): 38-43. DOI：

摘要

有别于公共连接点电压跌落故障，当电压跌落故障发生在远端电网侧时，并入弱电网的逆变器在采用典型的低电压穿越控制策略时会出现稳定问题。文中以单逆变器无穷大系统为例，首先建立系统准稳态模型，并分别从电压跌落程度、线路感抗大小、低电压穿越增益系数3个因素分析逆变器失稳机理；其次，建立系统小信号模型，分析得出准稳态模型稳定情况下逆变器还可能存在小干扰稳定问题。最后，基于MATLAB/Simulink仿真验证了理论分析的合理性。

Abstract

For the inverters connected to the weak grid

the typical low voltage ride-through(LVRT)control methods may result in instability of the system during severe voltage sag on the remote grid side. The instability mechanism is different from that during the voltage sag at the point of common coupling. By taking a single inverter infinite system as an example

this paper develops a quasi-steady model of the system. The instability mechanism of the inverter is analyzed from the factors of voltage sag level

line inductance

and gain coefficient of LVRT. Then the small signal model of the system is established. The analysis shows that the inverter may also have the problem of small-signal stability when the quasi-steady-state model is stable. Finally

the rationality of theoretical analysis is verified based on the MATLAB/Simulink simulation.

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