含多类型分布式电源的主动配电网分布式三相状态估计

提出一种含多类型分布式电源(DG)的主动配电网分布式三相状态估计方法。首先,建立了DG并网的三相模型,将DG并网分为直接并网和经脉宽调制换流器并网两类。选取交流节点的电压、DG的运行状态为状态变量,采用加权最小二乘求解。对于未配置实时量测的DG,提出了一种添加伪量测的可行方案,以提高网络的可观测性。进一步,为提高主动配电网状态估计的计算效率与数值稳定性,提出一种扩展分区、将外网边界状态量估计值作为本区域伪量测的分布式状态估计方法。最后,实际的算例分析验证了所提方法的有效性。

Distributed Three-phase State Estimation for Active Distribution Network Integrated with Different Types of Distributed Generators

A distributed three-phase state estimation method for active distribution network integrating different types of distributed generators (DGs) is proposed. Firstly, the models of three-phase DGs connected to grids are presented, DGs connected to grids are divided into two types: directly or through pulse width modulation (PWM) converters. The states of AC bus voltage, together with the states of DGs, are selected as state variables, which are estimated using weighted least squares (WLS). A feasible way to add pseudo-measurements for unmonitored DGs is introduced so as to enhance the observability. Furthermore, aimed at increasing computational efficiency and numerical stability, a distributed method that extends sub-areas and sets the estimated values of border buses as pseudo-measurements for the area proper is implemented. Finally, test results have verified the effectiveness of the proposal. This work is supported by National Natural Science Foundation of China (No. 51107032, No. 51277052, No. 61104045, No. 51407125).