摘要
随着天中直流输送功率的提升,直流系统发生故障时对新疆电网的冲击逐步增大。结合新疆十三五电网规划目标,针对天中直流工程中的双极闭锁故障和风机机端电压变化,研究了天中直流稳控切配套火电方案的不同对暂态/稳态压升的影响。通过PSASP仿真可以得出,切机方案中多保留1台或者更多机组,对各电压等级暂态压升影响不大,但对500 k V、750 k V母线电压稳态压升有抑制作用;对于220 k V母线而言,保留火电机组较多时,其母线稳态压升较高,风电机组机端电压稳态压升也会升高。根据这一结论,将对今后进一步减少双极闭锁故障对新疆电网的冲击,提高电网安全稳定运行水平起积极作用。
With the improvement of DC transmission power from Hami to Zhengzhou, the impact on Xinjiang power grid gradu- ally increases when a fault occurs in DC system. Combined with the 13th five - year planning objectives in Xinjiang power grid, and aiming at bipolar block faults and wind generator terminal voltage changes in Tian Zhong HVDC project, the influence of cutting different thermal power on transient and steady - state voltage rise in DC stability control schemes is studied. Through PSASP simulation, it can be obtained that, retaining one or more units in the generator tripping scheme has little in- fluence on transient voltage rise with different voltage level, but it suppresses the steady - state voltage rise of 500 kV and 750 kV bus, and for 220 kV bus, when retaining more thermal power units, the steady - state voltage rise of the bus is higher, and the steady - state vohage in the terminal of wind power unit will also rise. This conclusion makes positive contribution to reduce the impact of bipolar blocking faults on Xinjiang power grid and improve the safe and stable operation level of the grid in the future.
出处
《四川电力技术》
2016年第5期1-4,共4页
Sichuan Electric Power Technology
基金
国家自然科学基金项目(51267017)
国家863计划(2013AA050604)
关键词
天中直流
双极闭锁
机端电压
暂态电压
稳态电压
Tian - Zhong HVDC project
bipolar blocking
terminal voltage
transient voltage
steady - state voltage
