摘要
为了解决以往特高压直流输电工程中直流线路故障重启策略不完善导致直流功率波动甚至双极闭锁的不足,提出了把直流输电运行工况和运行功率点加入到直流线路故障重启策略中。利用RTDS对特高压直流输电线路接地故障进行仿真,建立直流输电线路接地故障等效模型。针对在故障极重启动过程中非故障极实际直流功率波动大的问题,提出采用闭锁非故障极低压电流(VDCL)功能的方法来减少非故障极实际直流功率的波动。以溪洛渡左岸-浙江金华±800k V特高压直流输电工程为试验背景,仿真试验证明:所提出的特高压直流输电线路故障重启优化策略能有效的提高系统线路故障时的稳定性,具有很好的工程实用性。
To solve the problem that UHVDC DC line fault recovery logic is not perfect resulting DC power fluctuating even bipole blocking, a new strategy considering the HVDC working conditions and running power point against DC line faults is put forward. RTDS is used to simulate the DC line fault and build the equivalent line-to-ground fault model. A strategy inhibiting VDCL function of the non-fault pole for some time is illustrated to decrease the non-fault pole power fluctuation. Based on Xiluodu-Zhejiang Jinhua ±800k V UHVDC, it is concluded that the sugguested DC line fault recovery strategy can effectively keep the whole HVDC system stable against DC line faults.
出处
《电气技术》
2016年第7期36-40,47,共6页
Electrical Engineering
