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模块化多电平换流器的运行边界分析及提高运行稳定性的控制方法
王少伟, 刘天琪, 李保宏
四川大学 电气工程学院,四川 成都 610065
摘要:
在分析模块化多电平换流器(MMC)稳定运行应满足多种约束条件的基础上,推导了MMC的运行边界;以换流器向交流系统注入的有功功率、无功功率为指标,建立了用于描述换流器运行特性的P-Q功率域;分析了影响换流器运行边界的多种因素,并详细阐述了交流系统阻抗对换流器有功传输能力的影响;以增大换流器稳定运行范围为优化目标,提出了一种基于虚拟阻抗控制的优化方法。
关键词:  直流电网  模块化多电平换流器  P-Q功率域  控制方式
DOI:10.16081/j.epae.201909021
分类号:TM46;TM721.1
基金项目:国家重点研发计划项目(2018YFB0904600)
Analysis of operation boundary of modular multilevel converter and control method for improving operation stability
WANG Shaowei, LIU Tianqi, LI Baohong
College of Electrical Engineering, Sichuan University, Chengdu 610065, China
Abstract:
Based on the analysis that the stable operation of MMC(Modular Multilevel Converter) should satisfy various constraints, the operation boundary of MMC is deduced. Taking the active power and reactive power injected into the AC system as the index, the P-Q power domain for describing the operation characteristics of converter is established. The various factors affecting the operation boundary of the converter are analyzed, and the influence of AC system impedance on the active power transmission capability of the converter is expounded in detail. In order to increase the stable operation range of converter, an optimization method based on virtual impedance control is proposed.
Key words:  DC grid  MMC  P-Q power domain  control scheme

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