Small-signal Modeling and Stability Analysis of Modular Multilevel Converter Based on Virtual Synchronous Generator Control

HUANG Di; GUO Li; LI Xialin

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Small-signal Modeling and Stability Analysis of Modular Multilevel Converter Based on Virtual Synchronous Generator Control

更新时间：2025-12-08

- Small-signal Modeling and Stability Analysis of Modular Multilevel Converter Based on Virtual Synchronous Generator Control
- Vol. 46, Issue 2, Pages: 698-711(2020)
- 作者机构：
  
  天津大学智能电网教育部重点实验室
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：29 February 2020，
  
  Published：2020
- 稿件说明：
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HUANG Di, GUO Li, LI Xialin. Small-signal Modeling and Stability Analysis of Modular Multilevel Converter Based on Virtual Synchronous Generator Control[J]. 2020, 46(2): 698-711.
DOI：

HUANG Di, GUO Li, LI Xialin. Small-signal Modeling and Stability Analysis of Modular Multilevel Converter Based on Virtual Synchronous Generator Control[J]. 2020, 46(2): 698-711. DOI：

摘要

针对模块化多电平换流器（modular multilevel converter

MMC）采用虚拟同步（virtual synchronous generator

VSG）控制后的稳定性

首先基于模块化建模思路

建立了基于虚拟同步控制的MMC并网系统精确小信号稳定性分析模型。将MMC的两电平简化模型与精确模型特征值对比发现

虚拟同步控制时

简化模型忽略了一种同时受虚拟同步控制和环流抑制（cinculating current suppression control

CCSC）控制参数影响的耦合模态（16 Hz左右）。然后重点分析了外部模态（2 Hz左右）、耦合模态和内部谐波模态（100 Hz左右） 3种重要模态的稳定性

由详细稳定性分析可知

若调整虚拟同步控制参数以增大外部模态阻尼和稳定性时

会导致耦合模态的阻尼和稳定裕度减小

因此在优化虚拟同步控制参数时需同时关注外部模态和耦合模态稳定性。此外

电网强度较弱时

系统可能会出现外部模态振荡失稳;而环流抑制参数设置不合理时

系统可能会出现内部谐波模态失稳。最后

通过与经典矢量控制的稳定性对比

说明经典矢量控制下不存在耦合模态;在电网强度较弱的情况下虚拟同步控制稳定性更好。

Abstract

This paper focuses on the stability of modular multilevel converter（MMC） using virtual synchronous generator（VSG） control. Firstly

based on the idea of modular modeling

an accurate small-signal stability analysis model of MMC using VSG control is established. Then

the eigenvalues of the two-level simplified model is compared with that of the accurate MMC model

revealing that the simplified model ignores a coupled mode（about 16 Hz） which is affected by both VSG control and circulating current suppression control（CCSC） parameters. Thirdly

the stability of three important modes of external mode（about 2 Hz）

coupled mode and internal harmonic mode（about 100 Hz） is analyzed. The stability analysis results show that adjusting the VSG control parameters will increase the damping and stability of external mode and reduce the damping and stability margin of the coupled mode. Therefore

it is necessary to pay attention to the stability of the external mode and coupled mode when optimizing the VSG control parameters. In addition

external mode instability may occur when the power grid is weak

and internal harmonic mode instability may occur when the CCSC parameters are unreasonable. Finally

the stability is compared to that of classical vector control

revealing that there exists no coupled mode under classical vector control

thus the stability of VSG control is better when the power grid is weak.

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