基于PMU的电压稳定动态线性化指标优化切负荷算法

Optimization of a load shedding scheme using dynamic voltage stability linearized index based on PMU

紧急状况下,优化包含动态负荷的系统切负荷量,以保证系统电压快速恢复正常状态是系统安全的关键。利用PMU测量信息推导了电压稳定动态线性化指标的灵敏度,将其作为实施切负荷的作用因子。建立了以切负荷量最小为目标函数和电压指标偏差量为约束条件的切负荷优化模型。首次实现了分区多步切负荷的算法,在实时计算得到的动态电压稳定指标超标基础上,利用所提出的优化模型实施多步动态优化切负荷,并实时修正作用因子的灵敏度,克服了传统一步欠切或过切的缺点。用IEEE14节点测试系统和国内实际电网算例证实了该方法的可行性和有效性。

It is critical to guarantee the system＇s security as quickly as possible by optimizing the shedding load including dynamic components under contingencies. Dynamic voltage stability linearized index sensitivity for dynamic load model is derived based on PMU for the role of the implementation of load shedding factor; the optimization model of load shedding has been established with the objective function of a minimum of load shedding and the constraint of the voltage indicator deviation. The distributed multi-step load shedding algorithm is firstly achieved according to the dynamic order of the index-exceeding node, and the sensitivity of linearized index is corrected at each step, which overcomes the over-shedding or under-shedding problem in traditional methods. Examples ofIEEE 14-bus tested system and real grid system demonstrate the feasibility and effectiveness of this method.