摘要
柔性直流配电网在运行过程中可能发生各类故障,故障产生的过电压又会对直流配电系统产生重大的影响。综合考虑各类可能发生的故障,如交流侧母线故障、直流阀厅内部故障、直流断路器误动作和直流配电线路故障等,统计得到系统各个关键位置的最大过电压水平。为了对过电压进行限制,选用两种避雷器布置策略实现对系统的保护,仿真表明避雷器配置能够有效降低系统过电压水平。参考仿真结果,并考虑一定的绝缘裕度,进一步确定了设备的绝缘水平。
Various faults may occur in the operation of flexible DC distribution network, and the overvoltage caused by faults, in turn, has an impact on the DC distribution system. In consideration of all possible faults such as AC side bus fault, the internal fault of DC valve hall, maloperation of DC circuit breaker, DC distribution line fault, the maximum overvoltage levels at each key position of the system are obtained. In order to limit the overvoltage, two kinds of arrester allocation strategies are selected to protect the system. Simulation results show that the arrester allocation can effectively reduce the overvoltage level of the system. Based on the simulation result and in accordance with a certain insulation margin, the insulation level of the equipment is determined.
作者
苏宜靖
董立
唐律
丁月强
李子恒
SU Yijing;DONG Li;TANG Lyu;DING Yueqiang;LI Ziheng(State Grid Zhejiang Electric Power Co., Ltd., Hangzhou 310007, China;State Grid Shanxi Electric Power Company, Xi′an 710048, China)
出处
《浙江电力》
2019年第3期20-24,共5页
Zhejiang Electric Power
基金
国网浙江省电力有限公司科技项目(5211DS15002W)
关键词
柔性直流
直流配电网
避雷器
过电压
绝缘水平
flexible DC
DC distribution network
arrester
overvoltage
insulation level
