Analysis of Power Frequency Fault Characteristics Under Integration of Modular Multilevel Matrix Converter

HE Jiawei; WEI Jie; DAI Wei; LI Bin; ZHOU Bohao; WU Tonghua

doi:10.7500/AEPS20240115003

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Analysis of Power Frequency Fault Characteristics Under Integration of Modular Multilevel Matrix Converter

Key Technologies for Offshore Wind Power System | 更新时间：2025-06-16

- Analysis of Power Frequency Fault Characteristics Under Integration of Modular Multilevel Matrix Converter
- Automation of Electric Power Systems Vol. 48, Issue 21, Pages: 49-60(2024)
- 作者机构：
  
  1.智能电网教育部重点实验室（天津大学），天津市 300072
  2.南瑞集团有限公司（国网电力科学研究院有限公司），江苏省南京市 211106
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China for Distinguished Young Scholars(52025071);National Natural Science Foundation of China(52207129)
- DOI：10.7500/AEPS20240115003
  CLC：
- Received：15 January 2024，
  
  Revised：2024-05-17，
  
  Published Online：13 September 2024，
  
  Published：10 November 2024
- 稿件说明：
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何佳伟,魏杰,戴魏等.模块化多电平矩阵换流器接入下的工频故障特性分析[J].电力系统自动化,2024,48(21):49-60.

HE Jiawei,WEI Jie,DAI Wei,et al.Analysis of Power Frequency Fault Characteristics Under Integration of Modular Multilevel Matrix Converter[J].Automation of Electric Power Systems,2024,48(21):49-60.
何佳伟,魏杰,戴魏等.模块化多电平矩阵换流器接入下的工频故障特性分析[J].电力系统自动化,2024,48(21):49-60. DOI： 10.7500/AEPS20240115003.

HE Jiawei,WEI Jie,DAI Wei,et al.Analysis of Power Frequency Fault Characteristics Under Integration of Modular Multilevel Matrix Converter[J].Automation of Electric Power Systems,2024,48(21):49-60. DOI： 10.7500/AEPS20240115003.

摘要

基于模块化多电平矩阵换流器（M3C）的柔性低频输电系统在中远海风电外送、异步电网互联等方面优势突出。然而，有别于模块化多电平换流器（MMC）等其他电力电子换流设备，M3C的控制策略将导致系统故障特性发生显著变化。现有将电力电子设备负序部分等效为开路的故障等值与响应特性计算方法无法适用。文中计及M3C正序定电容电压总平均值控制、负序电流注入控制以及环流控制分层构成的桥臂电容电压均衡策略，推导了工频侧线路故障以后，M3C输入输出功率均衡、桥臂功率均衡（电容电压均衡的必要条件）与正负序电压电流间的映射关系，由此构建了工频侧线路故障（不对称、对称）后的M3C输出电压电流响应特性的等效模型。在此基础上，提出了M3C接入下工频侧线路故障后电压电流响应特性的精确计算方法。最后，基于PSCAD/EMTDC仿真平台，搭建了海上风电柔性低频送出系统仿真模型，通过大量仿真算例充分验证了所提故障特性分析方法的正确性和精确性。

Abstract

The flexible low-frequency transmission system based on modular multilevel matrix converter (M3C) has outstanding advantages in medium- and far-offshore wind power transmission

and asynchronous grids interconnection. However

different from such power electronic converters as modular multilevel converter (MMC)

the M3C control strategy may result in significant changes in system fault characteristics. The existing fault equivalence and response characteristic calculation method is not applicable

in which the negative-sequence component of power electronic equipment is equivalent to an open circuit. In this paper

the mapping relationship between the input/output power balance

the bridge-arm power balance (necessary condition for the capacitor voltage balance)

and the positive- and negative-sequence voltage/current of M3C after system-side faults

is deduced considering the bridge-arm capacitor voltage balance strategy hierarchically composed of M3C positive-sequence capacitor voltage total average control

negative-sequence current injection control

and circulating current control. Thus

the equivalent models of M3C output voltage/current response characteristics after system-side faults (asymmetrical/symmetrical) are built. On this basis

the accurate calculation method for the voltage/current response characteristics after the system-side faults under the M3C integration is proposed. Finally

based on the PSCAD/EMTDC simulation platform

a simulation model of the offshore wind power flexible low-frequency transmission system is built

and the correctness and accuracy of the proposed fault characteristic analysis method are fully verified through a large number of simulation examples.

关键词

Keywords

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