舟山多端柔性直流输电工程直流系统放电特性  

Discharge Characteristics of DC System in Zhoushan Multi-terminal VSC-HVDC Transmission Project

作　　者：常浩[1] 厉璇[1] 马玉龙[1] 马为民[1] 陈东[1] 

机构地区：[1]国网北京经济技术研究院,北京102209

出　　处：《高电压技术》2017年第1期9-15,共7页High Voltage Engineering

摘　　要：为研究五端运行方式下换流站闭锁并打开交流进线开关后直流系统的放电特性,首先研究了舟山工程主接线、运行方式及设备参数,然后在此基础上对直流系统放电回路和放电过程进行分析,并计算出各种工况下直流系统的放电时间。同时,在PSCAD/EMTDC中建立了简化的五端柔直系统仿真模型,并对应理论计算工况进行仿真研究,得到各种工况下直流系统放电时间的仿真值,进而与特定情况下的现场数据进行对比。最后,综合理论分析和仿真结果,确定了换流站闭锁后直流系统放电至安全电压的时间约15 min。该计算方法也可用在其他的柔直工程中。To study the discharge characteristics of DC system from blocking the converters to opening the switches in Zhoushan project, we studied the main wiring, operation modes,and equipment parameters of Zhoushan project. Thereby, we analyzed the discharge circuit and discharge process, and calculated discharge time under various working conditions. Meanwhile, we established a simplified model of a five-terminal VSC-HVDC system in PSCAD/EMTDC, and studied the corresponding calculation cases. Simulation values of the discharge time in every working conditions are obtained. Based on the theoretical analysis and simulation result, time from blocking of the converter to reaching a safety dc voltage is determined as 15 minutes. Also, the calculation method can be used in any other VSC-HVDC project.

关 键 词：柔性直流输电 多端直流输电 模块化多电平变流器 孤岛供电 放电特性 

分 类 号：TM721.1[电气工程—电力系统及自动化]