基于馈线树的配网状态估计实用化方法

A distribution network state estimation practical method by the feeder tree

配网状态估计是其他高层应用软件的基础,量测充足系统可观测是状态估计的根本。针对配网系统量测冗余少且大多为电流量测的问题,提出根据配网运行参量间的关系把电流量测转化成状态估计所需的有功、无功量测,增加配网状态估计伪量测。提出利用配网辐射状特性形成馈线树,采用链表存储配网设备间的供电关系,利用前推回推方式补足伪量测。推导最优估计的电流匹配的方程及其求解方法,结合某城区配网实例进行分析,表明方法可行,该方法满足当前配电网自动化系统的实时需求。

State estimation is the base of distribution network application software. Enough measurement is the base of observation. By taking into account the real-time measurements with low redundancy and most of them are current measurements, based on the relationship among the distribution network running parameters, the method getting active and reactive power measurements using electric current measurement is proposed. Using the method can add many pseudo measurements. According to radial operation feature of electric distribution network, the feeder tree is formed, and the linked list is used to keep the relationship among the elements in the distribution network. The forward-backward sweep method is adopted in adding pseudo measurements. The matching current equations in the sense of optimal estimation and its systematic solution are deduced. The result of an actual system shows that the proposed method is feasible. The method proposed can satisfy the real-time application demand of the distribution system.