计及PMU的电力系统状态估计混合模型的研究

在等效电流量测变换状态估计模型的基础上引入旋转变换,实现方程的实、虚部严格解耦,并建立一种非线性估计和线性估计相结合的混合状态估计模型:首先把PMU节点的状态量测值以及PMU相关节点的状态推算值作为估计值进行非线性估计,然后再利用非线性估计结果和PMU量测进行线性估计。该模型可以充分利用PMU的量测,提高状态估计收敛速度,同时可以进一步利用PMU量测来提高估计精度,所需的存储量较小,具有较好的工程应用前景。最后采用IEEE14和IEEE30节点系统对该模型进行了验证。

A Study of the hybrid state estimaton model based on PMU

The model of conversion of equivalent current test is introduced first and then the rotational operator to the state and measurement functions result in the strict decoupling of the real and image part of normal equation.The article presents a hybrid state estimation model,which includes both nonlinear and linear state estimation : at first,the nonlinear state estimation is done on the condition of taking nodes' status values measured or calculated by PMU as estimation results,then the linear state estimation is done with both nonlinear state estimation results and PMU measurements.The model can improve the state estimation equations' convergence speed and estimation precision simultaneously by PMU measurements,requires smaller memory space and has a prospective future in engineering application.The effectiveness of the model is verified by the numerical calculation results of IEEE 14-bus and IEEE30-bus system respectively.