基于回路电流与负荷节点电压方程的配电网潮流计算  

Computing Power Flow of Distribution Networks Based on Loop Currents and Load Node Voltages

作　　者：初壮[1] 张建强[1] 蔡国伟[1] 

机构地区：[1]东北电力大学电气工程学院,吉林132012

出　　处：《电工技术学报》2016年第12期170-176,共7页Transactions of China Electrotechnical Society

摘　　要：将配电网负荷支路与形成环网支路选定为连支,据此将所有回路分为第1类回路及第2类回路,建立配电网的回路电流-负荷节点电压网络方程。方程中含有回路电流和负荷节点电压,网络回路阻抗与节点负荷等效阻抗分离。基于所建方程实现了配电网潮流计算的直接解法和前推回代法。进一步将模型和算法应用于三相不平衡配电网,针对单相负荷为零给直接解法带来的影响提出两种处理方法:将负荷等效为导纳或移除零负荷回路方程。提出的前推回代法直接根据节点负荷和电压计算回路电流,使前推计算得以高效进行,极大地提高了潮流计算速度。In this paper, a radial sub-network of a given distribution network is chosen as a tree, and two types of loops, i.e. 1st loops and 2nd loops, are built according to two kinds of links. Then the loop current and load node voltage equations are set up. Thus the loop currents and load node voltages are explicitly related, and the network loop impedance matrix and node load equivalent impedance matrix are clearly separated. Based on the proposed network equations, direct solution methods and a back/forward sweep method are designed and applied to several IEEE cases. Two techniques are used to deal with the single-phase zero load loops. One is that loads are equivalent as admittances, and the other is that zero-load loop equations are eliminated. As a result, the proposed back/forward sweep can calculate loop currents directly according to the node loads and node voltages, which enhances the efficiency greatly.

关 键 词：电力系统 前推回代法 直接解法 回路分析 配电网 弱环网 

分 类 号：TM732[电气工程—电力系统及自动化] TM744