锦屏—苏南特高压直流输电工程直流线路电磁暂态仿真

Simulation on Electromagnetic Transient Process in DC Transmission Line of ±800kV Power Transmission Project From Jinping to South Jiangsu

锦屏—苏南±800kV直流输电工程的稳态运行电压和每极双12脉动结构与向家坝—南汇±800kV直流输电工程相同,但输送容量、输送距离和导线型号与向家坝—南汇±800kV直流输电工程不同。针对锦屏—苏南±800kV直流输电工程的主回路参数,利用电磁暂态计算软件EMTP-RV,分别针对2种导线分裂间距对线路内部过电压和沿线接地短路电流进行了电磁暂态仿真计算,给出了2种导线分裂间距下直流线路的最大过电压水平,并根据大量仿真计算结果给出了直流线路沿线过电压水平包络线以及沿线各点对地短路电流包络线。该研究结果为锦屏—苏南特高压直流工程的设计和建设提供了技术依据。

The steady state operation voltage and the double 12-pulse structure per pole in ＋800kV DC power transmission project from Jinping to South Jiangsu are same as those in ±800kV DC power transmission project from Xiangjiaba to Nanhui, however the transmission capacity, transmission distance and conductor type of the former are different from the latter. Based on the parameters of main circuit of±800 kV DC power transmission project from Jinping to South Jiangsu, by use of electromagnetic transient analysis software EMTP-RV the electromagnetic transient processes of internal overvoltage and earth short circuit currents along the transmission line under two types of bundled conductor spacing, namely 45cm and 50cm, are simulated respectively, and the maximum overvoltage level of HVDC transmission line under these two spacings is obtained. According a lot of simulation results, the envelope of overvoltage level along the HVDC transmission line and the envelop of earth short circuit currents at different points along the HVDC transmission line are given. Results of this research issue offer technical basis for the design and construction for ±800kV DC power transmission project from Jinping to South Jiangsu.