一种含分布式电源的中低压配电网状态估计方法研究

为解决含分布式电源的中低压配电网中三相不平衡的状态估计问题,提出一种含分布式电源的中低压配电网状态估计方法。在包含分布式电源的中低压配电网中引入变压器等值模型,以节点注入电流方程为基础,建立了可同时处理三相三线制和三相四线制量测量的量测方程,扩大了其实用范围并提高了对系统的估计精度。其次,将直角坐标下线性零注入约束作为等式约束条件加入中低压配网状态估计模型中,使节点注入功率严格为零,并使计算过程得到简化。最后,采用细菌群体趋药性算法(BCC)对该模型进行状态估计。IEEE13节点修正系统算例的仿真结果验证了所提方法的有效性,且表明该方法具有良好的估计精度和收敛性。

A method of state estimation for middle voltage and low voltage distribution network with distributed generations

To solve the state estimation issue of middle/low voltage distribution network with Distributed Generations (DGs), this paper proposes a state estimation method for the middle/low voltage distribution network with DGs. The equivalent model of transformers is introduced in the middle/low voltage distribution network with DGs. Based on the node current injection equations, the measurement equations are established, which can solve the three-phase three wire system and three-phase four wire system and obtain better application scope and estimation accuracy. Besides, the linear zero injection constraint under the rectangular coordinate is adopted as an equality constraint in the proposed model. It can limit the node injection power to be zero strictly and simplify the calculation process. Finally, Bacteria Colony Chemotaxis (BCC) algorithm is applied to solve the state estimation of the proposed model. The effectiveness of the proposed method has been validated by the modified IEEE 13-bus test system, which demonstrates better estimation accuracy and convergence of the proposed method. This work is supported by National Natural Science Foundation of China (No. 61374098).