一种含分布式电源的中低压配电网状态估计方法研究  

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

作　　者：怀全 候小虎 何良策 卢志刚[3] HUAI Quan;HOU Xiaohu;HE Liangce;LU Zhigang(Shenhua Huanghua Harbour Administration Corp,Cangzhou 061110,China;State Grid Shanxi Tendering Co.,Ltd.,Taiyuan 030001,China;Key Lab of Power Electronics for Energy Conservation and Motor Drive of Hebei Province(Yanshan University),Qinhuangdao 066004,China)

机构地区：[1]神华黄骅港务有限责任公司,河北沧州061110 [2]国网山西招标有限公司,山西太原030001 [3]河北省电力电子节能与传动控制重点实验室(燕山大学),河北秦皇岛066004

出　　处：《电力系统保护与控制》2018年第21期69-77,共9页Power System Protection and Control

基　　金：国家自然科学基金资助项目(61374098)~~

摘　　要：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。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.

关 键 词：分布式电源 中低压配电网 三相不平衡 状态估计 零注入 BCC算法 

分 类 号：TM732[电气工程—电力系统及自动化]