计及统一潮流控制器的电力系统状态估计算法

The Algorithm of State Estimation for Power Systems with Unified Power Flow Controllers

在统一潮流控制器(UPFC)模型的基础上,提出了计及UPFC的电力系统状态估计算法。该算法根据给定的运行方式确定UPFC的控制约束条件,通过拉格朗日乘子将UPFC的控制约束条件计入状态估计目标函数,从而将含有UPFC的状态估计问题转化为带等式约束的最优化问题。该算法不仅可以完整地计及UPFC对电力系统的影响,而且可在不必改动原有状态估计模块的基础上,很容易地加入等式约束的修正模块。算例表明,提出的算法是有效可行的。

The paper presents an algorithm of state estimation for power systems with unified power flow controllers based on UPFC models. This algorithm determines the control constraint conditions of UPFC based on the given operating mode. The control constraint conditions of UPFCs are considered into objective function of state estimation through Lagrange multiplier, so that the problem of state estimation with UPFCs is changed into optimization problems with equality constraints. This algorithm can not only consider the infect of UPFCs on power system completely, but also can easily add modified modules of equality constraints to the conventional state estimation program without changing the original state estimation modules. The study case shows that the presented algorithm is effective and practical.