摘要
针对伪双极与双极MMC-HVDC结构不同,提出计及子模块状态的双极MMC-HVDC系统可靠性模型。首先,采用状态空间和分层等值算法,建立双极MMC-HVDC状态空间模型,计算系统等效停运小时数EOH(equivalent outage hours)、双极可用率BA(bipolar availability),定义MMC可靠性指标AMMC,提出EOH降低率指标αEOH;然后,建立可靠性指标对子模块冗余数、元件故障率灵敏度的解析表达;最后,算例证实双极MMCHVDC可靠性较高以及计及子模块状态的必要性。
With the consideration of differences between a pseudo bipolar MMC-HVDC and a bipolar one in terms of structure,a reliability model of bipolar MMC-HVDC considering sub-module states is proposed.First,the space state model of bipolar MMC-HVDC is established using the state space and hierarchical equivalence algorithms,and the equivalent outage hours(EOH)and bipolar availability(BA)of the system are calculated.An index of MMC reliability AMMC is defined,and an index of EOH reduction rateαEOH is also put forward.Then,the analytical expressions of the sensitivity of reliability indices with respect to sub-module redundancy and components’failure rate are established.Fi⁃nally,the results of a numerical example show that the reliability of bipolar MMC-HVDC is higher,and it is necessary to consider the states of sub-modules.
作者
李生虎
李璐璐
陶帝文
宫俊伟
LI Shenghu;LI Lulu;TAO Diwen;GONG Junwei(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,China)
出处
《电力系统及其自动化学报》
CSCD
北大核心
2023年第5期129-137,共9页
Proceedings of the CSU-EPSA
基金
国家自然科学基金资助项目(51877061)。
关键词
模块化多电平换流器
柔性直流
状态空间
分层等值
可靠性
灵敏度
modular multilevel converter(MMC)
flexible direct current
state space
hierarchical equivalence
reli⁃ability
sensitivity
