交直流系统发电机故障电压稳定评估快速算法

Fast algorithm applied to generator outage voltage stability evaluation in AC/DC system

高压直流输电给电力系统电压稳定的研究带来了新的挑战,适合于在线电压稳定评估的快速算法的开发显得尤为重要。针对发电机故障情况下采用线性灵敏度快速算法进行交直流系统电压稳定评估。在直流系统典型控制方式下,应用内点法求取故障前崩溃点处的负荷裕度,在崩溃点处将潮流方程线性化,快速求取除平衡节点发电机以外所有可能发电机故障情况时的负荷裕度。通过对IEEE30节点系统进行仿真证明该算法的可行性。

HVDC brings new challenges in voltage stability analysis.At the same tim e,the development of fast algorithm which is suitable to be applied into online voltage stability assessment becomes more and more important.This paper proposes f ast algorithm which is based on the linear sensitivity method to assess generator outage voltage stability in AC/DC power syste m.Under typical DC control mode,the prefault maximum loading point is computed using the interior point metho d,and then the power flow equations are linearized around prefault bifurcation point.Load margin of outages of all possible generators except for the generator at the slack bus are calculated.IEEE30 bus systems are utilized to demonstrate the feasibility of the algorith m.