失稳故障支路拟裕度评估及控制的虚拟支路法

摘要

为评估失稳故障支路的严重程度及解决故障后系统失去潮流可行解的问题,提出了失稳故障支路拟裕度评估及控制的虚拟支路法.该方法将待切除的故障支路用一条含参数的虚拟支路置换,使虚拟支路开断问题转换为故障支路两端点注入功率增长的裕度问题,并用拟裕度大小评估故障支路的严重程度.算法利用最小控制代价的过程控制法,使虚拟支路完全切除后系统获得可行潮流解;故障后优化控制是在可行解上优化系统,以满足稳定裕度要求.通过IEEE算例验证了方法的可行性和有效性.%A virtual branch quasi-margin evaluation and control method is proposed to evaluate the severity of instable fault branches. The proposed method has the ability to overcome the problem that no feasible power flow solution existed after faults in the system. This method replaces the fault branch with a parameterized virtual branch, and changes the removed virtual branch issue to the problem of the injected power in fault branch. The quasi-margin is used for evaluating the severity of fault branch. Based on process control with minimum control cost objective, feasible power flow solution can be obtained. The post-fault optimal stability control is based on feasible power flow solution. The feasibility and efficiency of proposed method are validated by the simulation results of IEEE testing system.