【摘要】 大扰动冲击后,直流逆变站的动态行为对受端电网电压稳定性将产生显著影响。研究了逆变站交流母线电压大幅波动过程中,直流逆变站各主要电气量及其与交流电网交换的动态无功的非线性轨迹;系统地分析了低压限流(voltage dependent current order limiter,VDCOL)启动点参数、直流控制方式、电压测量时间常数等对逆变站动态无功轨迹的影响;在此基础上,识别了关键影响因素,并提出优化方案。呼盟—豫西±800 kV/8 000 MW特高压直流受端电网大扰动时域仿真结果,表明了正确设置控制器仿真参数对客观反映电网受扰行为的重要意义,并验证了控制器参数优化改善受端电网电压稳定性的有效性。更多还原

【Abstract】 The post-large disturbance dynamic behavior of HVDC inverter station greatly impacts the voltage stability of power grid at receiving end. The main electric quantities of HVDC inverter station and the nonlinear trajectory of dynamic reactive power exchanged between HVDC inverter station and AC power grid during wide fluctuation of AC bus voltage in inverter station are researched; the impacts of the parameters at the starting point of voltage dependent current order limiter(VDCOL), the DC control modes, the time-constant of voltage measurement, etc. on dynamic reactive power trajectory of inverter station are systemically analyzed. On this basis, the key impacting factors are recognized and corresponding optimization scheme is put forward. Time-domain simulation results of large disturbance occurred in AC power grid at the receiving end of UHVDC ±800k V/8000 MW power transmission project from Hulunbair League to West Henan Province show the significant meaning of properly setting simulation parameters of the controller to objectively reflect the behavior of power grid during the large disturbance, and the effectiveness of improving voltage stability of power grid at receiving end by controller parameter optimization is validated.更多还原