模块化多电平换流器的可靠性维修周期优化  

Optimization of Reliability Maintenance Cycle of Modular Multilevel Converter

作　　者：韩晓云 郝全睿[1] 许烽 李东[1] HAN Xiaoyun;HAO Quanrui;XU Feng;LI Dong(Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education,Shandong University,Jinan 250061,China;State Grid Zhejiang Electric Power Co.,Ltd.Research Institute,Hangzhou 310014,China)

机构地区：[1]山东大学电网智能化调度与控制教育部重点实验室,济南250061 [2]国网浙江省电力有限公司电力科学研究院,杭州310014

出　　处：《高电压技术》2020年第10期3429-3439,共11页High Voltage Engineering

基　　金：国家重点研发计划(2018YFB0905800)。

摘　　要：模块化多电平换流器(modular multilevel converter,MMC)是柔性直流输电工程中的关键设备,为了提高其输电的可靠性并降低长期运行成本,对MMC的可用度与维修策略展开了研究。首先基于马尔科夫模型,将MMC作为可修系统推导了MMC可用度评估参数;其次针对定期维修问题,建立了基于年龄更换和成批更换策略的最小费用模型与最小停机时间模型;最后通过算例,得出了不同维修策略下MMC的最优维修周期,及最优维修周期关于故障率等参数的灵敏度。结果表明:随着维修周期的增长,费用成本与停机时间皆先降后升,平衡预防性维修成本与故障停机损失可取得最优维修周期,选取合适的维修周期可显著降低运行成本与故障频率。该结果可为MMC的稳定运行与定期维修问题提供参考。Modular multilevel converter(MMC)is a key device in a flexible dc transmission project.In order to improve its transmission reliability and reduce long-term operating costs,the availability and maintenance policies of MMC are studied.Firstly,based on the Markov model,MMC is used as a repairable system to derive the MMC availability evaluation parameters.Secondly,for regular maintenance,a minimum cost model and a minimum downtime model based on age replacement policy and block replacement policy are established.Finally,the optimal maintenance cycle of MMC under different maintenance policies and the sensitivity of the optimal maintenance cycle with respect to parameters such as failure rate are obtained through case study.The results show that,as the maintenance cycle increases,both the cost and downtime decrease first and then increase.The optimal maintenance cycle can be obtained by a compromise between the cost of preventive maintenance and the loss of downtime.Moreover,choosing an appropriate maintenance cycle can significantly reduce operating costs and failure frequency.Study results of reliability and maintenance policies can provide a reference for the stable operation and regular maintenance of MMC.

关 键 词：模块化多电平换流器 马尔科夫模型 可用度 维修策略 灵敏度 

分 类 号：TM721.1[电气工程—电力系统及自动化]