摘要
2015年四川电网将形成特高压交直流并联的格局,强直流弱交流的特点比较明显,暂态稳定与小扰动稳定问题都比较突出。利用仿真软件PSS/E考察了特高压直流对四川电网暂态稳定以及小扰动稳定的影响,同时分析了直流孤岛运行、动态无功补偿器、直流协调控制、直流附加控制器对四川电网的影响。仿真结果表明直流换流站附近的交流系统故障以及直流双极闭锁容易导致系统失稳,动态无功补偿器以及直流协调控制器能提高四川电网的暂态稳定性,孤岛运行对四川电网的暂态稳定性改进有限,直流附加控制器能为四川电网参与的主要振荡模式提供良好的阻尼。特高压直流的动态行为对四川电网的稳定性有着决定性的作用。
By 2015, Sichuan will have formed a Ultra-High AC-DC parallel power system with strong DC, weak AC, and serious problems in the transient and small signal stability. PSS/E was adopted to simulate UHVDC transmission impacts on the transient and small signal stability of Sichuan power grid, as well as the impacts of SVC, island operation of DC line, HVDC small signal modulation, and coordinated control of DC lines. The simulation results show that the fault in AC substation near the DC converter station, and bipolar block of any UHVDC line may lead to system in- stability; SVC and coordinated control of DC lines can greatly improve the stability of Sichuan power grid, however, island operation of DC line only produces relatively small influence ; small signal modulation can improve the damp of the oscillation participated by Sichuan power grid. The dynamic behavior of DC lines is the decisive factor for the stability of Sichuan power grid.
出处
《华东电力》
北大核心
2011年第12期2007-2011,共5页
East China Electric Power
