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中文摘要：
利用某大型受端电网的实时数据,借助时域仿真评估协调二级电压控制对其长期电压稳定性的影响。结果表明,若分区内具有较大可调无功裕度,则协调二级电压控制有利于提高电压稳定性,否则影响甚微。针对受端电网发生大扰动后往往无功容量不足的实际情况,提出一种基于轨迹灵敏度的紧急电压控制策略,能够实时地在调控范围内选择控制发电机,并能方便地同其他控制策略结合,以达到更优的控制性能。时域仿真结果证明,这种紧急电压控制策略在大扰动后能够明显提高系统的长期电压稳定性。
英文摘要：
By using real-time data of a large-scale receiving power grid,the impact of coordinated secondary voltage control（CSVC） on long-term voltage stability is assessed through time domain simulation.The results show that CSVC will help improve system voltage stability when the sub-regions have large adjustable reactive power margin,otherwise it will have little effect.Given that severe faults often result in reactive power shortage in receiving system,an emergency voltage control strategy is proposed based on trajectory sensitivity to pick up control generators according to real time system faults within the whole control range.Moreover,it can be easily combined with other control strategies to achieve better control performance.The time-domain simulation results prove that this emergency voltage control strategy can significantly improve system long-term voltage stability after large system disturbance.
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