杨帆,张旭,乐健.500 kV限流器接入对南网系统过电压的影响分析[J].电测与仪表,2024,61(2):191-196. YANG Fan,ZHANG Xu,LE Jian.Analysis of the influence of a 500 kV current limiter on overvoltage characteristics of china southern power grid[J].Electrical Measurement & Instrumentation,2024,61(2):191-196.
500 kV限流器接入对南网系统过电压的影响分析
Analysis of the influence of a 500 kV current limiter on overvoltage characteristics of china southern power grid
串联限流电抗器能有效限制500 kV电压等级的短路电流，但其接入系统后会影响系统的过电压水平，需要进一步进行安全校验。以广南站500 kV/90 kA 限流器示范工程为背景，利用电磁暂态仿真软件EMTP 研究500 kV限流电抗器自身的过电压以及限流电抗器接入后对系统的工频过电压、操作过电压、线路断路器的暂态恢复电压，以保证系统与设备的安全运行。结果表明，无论是否采用限流电抗器，顺德-广南500 kV线路无故障甩负荷和单相故障切负荷时的工频过电压均在允许的范围内；500 kV限流电抗器接入后的顺德-广南500 kV线路合闸操作过电压未超过标准允许范围，变电站及限抗站金属氧化物避雷器MOA能耗及电流与其设计参数相比有很大的裕度。
英文摘要:
The series current limiting reactor can effectively limit the short-circuit current of 500 kV voltage level, but it will affect the overvoltage level of the system after it is connected to the system, and further safety verification is required. Taking the 500 kV/90 kA current limiter demonstration project of Guangnan station as the background, the electromagnetic transient simulation software of EMTP is used to study the overvoltage of the 500 kV current limiting reactor itself and the power frequency overvoltage and operating overvoltage of the current limiting reactor to the system, the transient recovery voltage of the circuit breaker, etc., so as to ensure the safe operation of the system and equipment. The results show that the power frequency overvoltage of Shunde-Guangnan 500 kV transmission line in the case of load rejection without fault and load switching with single phase fault is within the allowable range, no matter whether the current limiting reactor is used or not. The switching overvoltage of the 500 kV Shunde-Guangnan line after the connection of the current limiting reactor does not exceed the allowable range of the standard, and the MOA energy consumption and current of the MOA in the substation and the limiting reactance station have a large margin compared with the design parameters.
