考虑零注入约束的双线性WLAV状态估计

Power system state estimation using bilinear WLAV method with zero injection constraints

零注入节点功率失配量对电力系统安全评估有着重要影响,为减小零注入节点的功率失配量,提出了考虑零注入约束的双线性WLAV(Weighted Least Absolute Value)状态估计方法,该方法将零注入约束以等式约束的形式添加到双线性WLAV状态估计中。基于IEEE标准系统,采用零注入约束的双线性WLAV状态估计方法对国内某省网进行仿真,结果表明:该方法既能保留基于内点法的双线性WLAV状态估计原有的计算效率高的优点,又能减小零注入节点的功率失配量,且抗差性能有一定程度的提升。

Power mismatches of zero injection nodes have significant impact on the security estimation of the power system. In this paper,a novel state estimation method for the power system is proposed to reduce the power mismatches of zero injection nodes,in which zero injection constraints are added in the form of equality constraints in the bilinear WLAV（ Weighted Least Absolute Value）. Based on the IEEE standard system,a case study on a provincial system is performed using this method. The results demonstrate that this method can not only ensure the existing high computational efficiency of bilinear WLAV based on interior point method,but also reduce the power mismatches of zero injection nodes. Meanwhile,its robustness is improved to a certain degree.