500kV串联补偿装置过电压保护研究

Study on Overvoltage Protection for 500 kV Series Compensation Devices

串联补偿装置的过电压保护直接关系到串补站的投资和电网的安全运行,在工程设计中至关重要。本文利用电磁暂态仿真程序EMTPE,对冀北电网某500 kV串联补偿工程进行了串联补偿装置的过电压保护研究,采用带火花间隙金属氧化物限压器MOV的方案保护串联补偿电容器,建立了系统等值计算模型,计算了发生各种区外故障时MOV的最大放电电流和最大能耗,从而确定了MOV的启动电流和启动能耗;计算了区内故障时MOV和阻尼电阻的最大能耗水平,计算结果可供工程参考。

Overvoltage protection of series compensation device is related directly to the investment of series compensation station and safe operation of power grid and is utmost important in engineering design.In this paper,the over voltage protection of series compensation device of certain 550 kV series compensation project at Jibei Power Grid by the use of simulation software EMTPE is studied.The series compensation capacitor is protected by the use MOV scheme with spark gap,the equivalent calculation model of system is established.The maximum discharge current and power loss of MOV in external fault is calculated,thus the starting current and power loss of MOV is defined.The maximum power loss of MOV and damping resistance in internal fault is calculated and the calculation result can be used for engineering reference.