基于EMTP-RV的中俄直流背靠背工程交流操作过电压研究

分析了直流背靠背换流站交流出线操作过电压和一般交流线路操作过电压的区别,对规划的中俄直流背靠背工程使用电磁暂态仿真程序(EMTP-RV)进行建模仿真,研究了各种操作过电压:三相合空线、单相自动重合闸及直流操作中的背靠背直流逆变站最后一台断路器跳闸和直流闭锁产生的过电压.研究结果表明逆变侧换流母线交流出线沿线最高过电压达1.98p.u.,由在直流逆变侧最后一台断路器跳闸造成,提出可以通过线路中部加装线路避雷器和优化直流控制系统的方法来有效限制线路过电压.研究结论为直流换流站交流出线过电压的研究提供了新的研究方法.

Study of AC Switching Over-voltage of HVDC Converter Station Based on EMTP-RV

This paper studies AC switching over-voltage of back to back(BTB) HVDC converter station and the operating over-voltage.These operating over-voltage were usually produced when closing the three-phase idle line,the single-phase autoreclose breaker,DC system block and the last breaker trip were also concerned in this paper.Further more,in one planning BTB project from Russia to China,through the analysis of a BTB HVDC system by the Electro-Magnetic Transient Program(EMTP-RV),the paper points out that the maximum over-voltage are 1.98p.u for the 500kV transmission line.And also,the over-voltage could be limited effectively by the optimizing DC control method or adding lighting arrester in the middle of the line.