±1100kV特高压直流输电换流站内深度限制过电压水平研究

Research on Overvoltage Limitation Inside ±1100 kV UHVDC Converter Station

换流站绝缘配合是±1 100 kV特高压直流输电工程的关键技术之一,对降低设备的制造难度具有重要意义。提出±1 100 kV特高压直流输电工程的仿真计算用模型;对系统稳态运行电压和操作过电压进行了仿真研究和总结;在避雷器性能老化试验的基础上,详细介绍了采用高性能避雷器降低设备绝缘水平的可行性;给出了±1 100 kV特高压直流输电工程设备冲击绝缘水平的推荐值和绝缘裕度。

Insulation coordination inside the converter station is one of the key technologies for ±1 100 kV UHVDC power transmission project and it is of significance to reduce the manufacturing difficulty of related equipments.A model for the simulation and calculation of ±1 100 kV UHVDC power transmission project is proposed;and steady-state operation voltage and switching impulse of ±1 100 kV UHVDC system are simulated and summarized.Based on the ageing test of arrester performance,the feasibility of reducing insulation level of equipments by high-performance arresters is presented in detail,and recommended values of impulse insulation levels and insulation margins of equipments for ±1 100 kV UHVDC power transmission project are given.