摘要
在一个多端MMC-HVDC系统中,只要有部分换流站有接地装置,其他换流站的电压就可以通过直流线路来确定。为了减少多端MMC-HVDC系统接地装置的数目,进而降低对多端MMC-HVDC系统的规划、设计、运行以及成本的要求,对其共用接地点方案进行了的研究。基于PSCAD/EMTDC仿真平台,搭建了5端MMCHVDC系统平台,通过选取4大类最具代表性的共用接地点方案,对部分换流站内可能发生的最为严重的故障进行仿真计算。仿真发现,若不装设接地装置,换流站的过电压水平会有所上升,并且上升的幅度与换流站采用的控制策略密切相关。综合考虑最大过电压和接地点数目,在采用(后备)定电压控制策略的换流站安装接地极是最佳的共用接地点方案。
In a multi-terminal MMC-HVDC （MMC-MTDC） system, if some converters are grounded, the voltages of the other converters can be specified through the DC power lines. In order to reduce the number of grounding electrodes and to lower the requirements of MMC-MTDCs in planning, design, operation and cost, we studied a common grounding strategy of the system through scanning the most severe overvoltage in some specified grounding schemes. Moreover, we established a 5-terminal MMC-HVDC system in PSCAD/EMTDC, and studied 4 types of grounding schemes. The simulation results show that the overvoltage in converter stations is influenced by the common grounding electrode scheme, and the maximum overvoltage is closely related to station control strategies. When the maximum overvoltage and the number of grounding electrodes are taken into consideration, installing grounding electrodes in the master converter stations is the best common grounding scheme.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2013年第11期2783-2790,共8页
High Voltage Engineering
基金
国家高技术研究发展计划(863计划)(2012AA050205)~~
