相量测量单元测量值对状态估计中等效电流量测变换算法的影响

针对同步相量测量单元(PMU)能够直接测量母线电压相量的特点,分析了引入PMU测量值对电力系统状态估计的影响.首先修正等效电流量测变换算法,提出了极坐标系下的全雅可比矩阵算法和简化雅可比矩阵算法,分别从增加PMU节点电压量测方程、以PMU测量值作为迭代初值、修正等效电流量测计算公式以及修正雅可比矩阵四方面分析了引入PMU测量值对算法迭代次数和滤波效果的影响.理论分析和算例结果表明,PMU测量值在这四方面对算法的迭代次数和滤波效果均有影响,有些影响还与PMU的数量有关.

INFLUENCES OF MEASURED VALUES FROM PHASOR MEASUREMENT UNITS ON EQUIVALENT CURRENT BASED MEASUREMENT TRANSFORM ALGORITHM IN STATE ESTIMATION

According to the feature that phasor measurement unit (PMU) can directly measure bus voltage phasors, the influence of introducing measured values from PMU on state estimation of power system was analyzed. At first the equivalent-current-based measurement transform (ECBMT) algorithm was modified and the full Jacobian algorithm and simplified Jacobian algorithm under polar coordinates were proposed, and in four aspects, i.e., increasing nodal voltage measurement equations of PMU, taking PMU measurement values as initial iterative value, modifying the calculation formula for equivalent-current-based measurement and modifying Jacobian matrix, the influences of introducing the values measured by PMU on iterative times and filtering effect were analyzed. The results of both theoretical analysis and case calculation show that the iterative times and filtering effect of the proposed algorithm are influenced by the values measured by PMU in these four aspects, and the influences on certain aspects are related to the amount of PMUs.