Stability Analysis and Control Parameter Optimization for Hybrid Modular Multilevel Converter Connected to Weak AC System

Xiaojun LU; Wang XIANG; Weixing LIN; Jinyu WEN

doi:10.7500/AEPS20190805006

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Stability Analysis and Control Parameter Optimization for Hybrid Modular Multilevel Converter Connected to Weak AC System

Basic Research | 更新时间：2025-06-16

- Stability Analysis and Control Parameter Optimization for Hybrid Modular Multilevel Converter Connected to Weak AC System
- Automation of Electric Power Systems Vol. 44, Issue 16, Pages: 70-78(2020)
- 作者机构：
  
  1.强电磁工程与新技术国家重点实验室(华中科技大学)，湖北省武汉市 430074
  2.电力安全与高效湖北省重点实验室(华中科技大学电气与电子工程学院)，湖北省武汉市 430074
  3.特变电工新疆新能源股份有限公司，新疆维吾尔自治区乌鲁木齐市 830011
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China;China Postdoctoral Science Foundation
- DOI：10.7500/AEPS20190805006
  CLC：
- Received：05 August 2019，
  
  Revised：2020-02-14，
  
  Published Online：29 May 2020，
  
  Published：25 August 2020
- 稿件说明：
移动端阅览
鲁晓军,向往,林卫星等.混合型MMC接入弱交流电网稳定性分析及控制参数优化[J].电力系统自动化,2020,44(16):70-78.

LU Xiaojun,XIANG Wang,LIN Weixing,et al.Stability Analysis and Control Parameter Optimization for Hybrid Modular Multilevel Converter Connected to Weak AC System[J].Automation of Electric Power Systems,2020,44(16):70-78.
鲁晓军,向往,林卫星等.混合型MMC接入弱交流电网稳定性分析及控制参数优化[J].电力系统自动化,2020,44(16):70-78. DOI： 10.7500/AEPS20190805006.

LU Xiaojun,XIANG Wang,LIN Weixing,et al.Stability Analysis and Control Parameter Optimization for Hybrid Modular Multilevel Converter Connected to Weak AC System[J].Automation of Electric Power Systems,2020,44(16):70-78. DOI： 10.7500/AEPS20190805006.

摘要

针对桥臂由半桥子模块和全桥子模块级联构成的混合型模块化多电平换流器（MMC），首先研究了混合型MMC输电系统小信号建模方法。以一个两端系统为例，基于根轨迹分析，分析了不同控制模式的混合型MMC接入弱交流电网时小干扰稳定性约束下的最大有功功率，并基于参与因子及模式分析得到了不稳定模态的典型参与变量和振荡频率，且进行电磁暂态仿真验证。基于控制参数灵敏度及动态特性影响分析，得到有利于增强小干扰稳定性和提升最大有功传输能力的控制参数优化策略。研究表明：弱电网接入下，混合型MMC逆变运行时失稳主要与

轴控制相关，需减小内环比例控制系数和降低前馈交流电流、电压滤波截止频率；整流运行时失稳主要与

轴控制相关，需增大外环比例控制系数。

Abstract

For hybrid modular multilevel converter (MMC) whose bridge arm is composed of cascaded half-bridge sub-modules and full-bridge sub-modules

this paper first studies the small-signal modeling method of the hybrid MMC transmission system. By taking a two-terminal system as an example

based on the root trajectory analysis

this paper analyzes the maximum active power with the constraints of small-signal stability when a hybrid MMC with different control modes is connected to a weak AC system. And the typical participation variables and oscillation frequencies are obtained via analyses on participation factor and mode

which are verified by electromagnetic transient simulation. The optimization strategy of control parameters for enhancing small-signal stability and maximum active power is proposed through sensitivity analysis of control parameters and the impact analysis of dynamic characteristics. The results show that

when the hybrid MMC is connected to the weak AC system

its operating instability as an inverter is related to

-axis control

and it is necessary to reduce the proportional gain of the inner control loop or the cutting-off frequency of the filter for feedforward AC current and voltage. When operating as a rectifier

its instability is related to

-axis control

and it is necessary to increase the proportional gain of outer control loop.

关键词

Keywords

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