特高压网架对华中电网短路电流水平的影响分析及限流措施

Analysis of effect of 1000kV UHV grid on the short circuit current of the Central China Grid and research on limiting measures of short circuit current

电力系统的高速发展导致了系统短路电流水平的急剧增加,原有开关设备的遮断容量将不能满足系统要求。针对2020年1000kV特高压网架形成前后的华中电网短路电流计算结果,分析讨论了提高电力系统电压等级、系统解环分区运行、采用高阻抗变压器等措施对华中电网短路水平的限制作用,并通过统计对比分析论证了1000kV特高压交流网架建立后有利于改善华中电网的短路电流水平。

High-speed development of power system will result in sharp increase of short circuit current, shutoff capacitance of intrinsic equipment cannot satisfy power system requirements. According to the short circuit current calculations of the Central China Grid before and after the founding of 1 000 kV UHV grid in 2020, several measures of limiting short circuit currents were analyzed, such as heightening voltage grade, splitting network, high-impedance transformer etc., and demonstrates the instauration of 1 000 kV UHV grid in favor of improving the short circuit current of the Central China Grid by statistical analysis.