配电网状态估计中的量测变换技术

分析了不同情况下状态估计算法中量测变换技术的应用情况，导出了量测变换的具体数学表达式和量测变换后各数据量权重的确定。文章分别对基于牛顿法的状态估计算法，以节点电压电流方程式为基础的状态估计算法及基于支路电流的配电网状况估计算法进行了比较，从文中分析可以看出，量测变换技术的应用虽提高了算法的运算速度但牺牲了估计精度。因此在应用量测变换技术时，须因地制宜，在速度和精度之间寻求平衡。

A DISCUSSION ON MEASUREMENT TRANSFORMATION TECHNOLOGY IN STATE ESTIMATION FOR DISTRIBUTION NETWORK

The application of measurement transformation technology in state estimation algorithm under different situations is analyzed. The concrete mathematical expression of measurement transformation is derived and the weights for various data quantities after measurement transformation are determined. The state estimation algorithms respectively based on Newton method, nodal voltage and current equations and the state estimation algorithm for distribution network based on branch currents are compared and analyzed. From the analysis results it is shown that the computation speed of the algorithm can be increased by applying measurement transformation technology, but the estimation accuracy will be sacrificed. So, in the application of measurement transformation technology attention should be paid to the balance between the operation speed and the estimation accuracy according to the practical situation.