采用自阻型子模块的模块化多电平换流阀可靠度评估  

Reliability Evaluation of Modular Multilevel Converter with Self-blocking Submodule

作　　者：张泽坤 赵巧娥[1] ZHANG Ze-kun;ZHAO Qiao-e(School of Electricity and Architecture,Shanxi University,Taiyuan 030013,China)

机构地区：[1]山西大学电力与建筑学院,太原030013

出　　处：《自动化与仪表》2022年第5期80-84,共5页Automation & Instrumentation

摘　　要：模块化多电平换流阀(modular multilevel converter,MMC)是柔性直流输电技术中的主要装置,为解决半桥子模块无法进行故障自清理的问题,该文采用具有直流故障电流阻断能力的自阻型子模块,并对采用自阻型子模块结构的模块化多电平换流阀的可靠性进行研究评估。文章利用Gamma分布和k/n(G)模型分别建立换流阀在冗余被动配置和主动配置情况下的可靠性函数,采用实际算例分析不同冗余配置策略和不同冗余度情况下对可靠性的影响。结果指出,冗余子模块配置策略的选择以及冗余度的合理选取均为换流阀可靠性的关键。The modular multilevel converter(MMC)is a major device in flexible DC transmission technology.To solve the problem that the half-bridge submodule cannot perform fault self-cleaning,the article adopts a self-blocking submodule with DC fault current blocking capability,and the reliability of the modular multilevel converter with the self-blocking submodule structure is studied and evaluated.The study evaluates the reliability of modular multilevel commutation valve with self-rejecting sub-module structure.The Gamma distribution and the k/n(G)model are used to establish the reliability functions of the converter valve in redundant passive and active configurations,and the impact on the reliability of different redundant configuration strategies and different redundancy degrees are analyzed by practical examples.The results point out that the selection of redundant sub-module configuration strategy and the reasonable selection of redundancy degree are the keys to the reliability of the converter valve.

关 键 词：自阻型子模块 冗余配置策略 可靠度评估 平均无故障时间 

分 类 号：TM711[电气工程—电力系统及自动化]