计及PMU的二次状态估计模型的研究

随着相量测量装置（PMU）在电网中的推广应用，其量测结果己成为电力系统重要的数据源之一。将PMU支路电流量测转换为支路潮流量测，使电流相量量测在状态估计中得到了有效的利用。二次估计模型首先把PMU节点的状态量测值作为估计值，PMU支路量测通过变换参与到非线性估计，收敛后再利用非线性估计结果和PMU量测进行线性估计。该模型在充分利用PMU量测特性，保持较高的估计精度的同时，也提高了方程数值稳定性和收敛速度。在快速分解算法的基础上，通过IEEE9和IEEE30节点系统仿真验证本文模型的有效性。

Study of the Double SE Model Based on PMU

The Phasor Measurement Unit(PMU) has been applied in the power system expansively, and the PMU measurements have become important data source. In this paper, we transform the branch current phasors into branch powers, so the PMU branch current phasor measurements can be utilized efficiently in the state estimation(SE). This paper presents a double SE model: at first, the nonlinear SE is done on the condition of taking nodes' status values measured by PMU as estimation results, and then the linear SE is done...