基于功率注入潮流模型的双极直流配电网的电压不平衡分析及传递计算  

Voltage Unbalance Analysis and Transfer Calculation of Bipolar DC Distribution Network Based on Power Injection Power Flow Model

作　　者：周亦尧 王强钢 匡江锋 廖建权 王洪彬 Zhou Yiyao;Wang Qianggang;Kuang Jiangfeng;Liao Jianquan;Wang Hongbin(State Key Laboratory of Power Transmission Equipment Technology School of Electrical Engineering Chongqing University,Chongqing 400044 China;Chongqing University-University of Cincinnati Joint Co-op Institute,Chongqing 400044 China;College of Electric Engineering Sichuan University,Chengdu 610065 China)

机构地区：[1]输变电装备技术全国重点实验室(重庆大学电气工程学院),重庆400044 [2]重庆大学辛辛那提大学联合学院,重庆400044 [3]四川大学电气工程学院,成都610065

出　　处：《电工技术学报》2025年第8期2656-2667,共12页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金重点项目(52337007);中央高校基本科研业务费基金项目(2023CDJYXTD-004)资助。

摘　　要：建设供电容量大、灵活性高、对直流型源荷友好的双极直流配电网是构建新型配电网的有效途径之一。然而,电压不平衡问题对双极直流配电网的推广和应用提出了挑战。该文分析电压不平衡的产生机理,并基于灵敏度定义了电压不平衡传递矩阵,该矩阵用于反映电压不平衡因子在双极直流配电网中各节点的传递特性。在此基础上,推导电压不平衡传递矩阵中各元素的解析表达式,提出基于牛顿-拉夫逊法的潮流计算方法来确定电压不平衡传递矩阵,所提方法采用注入功率进行潮流建模,并考虑分布式发电的下垂控制模型和综合负荷模型。最后,采用改造的IEEE 33节点测试系统验证了所提方法的有效性,并分析了电压不平衡传递的影响因素。The bipolar DC distribution network offers high power supply reliability,extensive transmission capacity,and adaptable voltage levels.Developing a bipolar DC distribution network represents an effective strategy for constructing a new type of distribution network.Voltage unbalance constitutes a distinctive power quality issue within bipolar DC distribution networks.Power flow calculation serves as the fundamental tool for analyzing voltage imbalance.Nevertheless,conventional power flow calculation methods merely illustrate the transfer outcomes of voltage unbalance,failing to depict its transfer process within the network.Furthermore,in practical engineering,power is often the measured electrical quantity rather than current,making the existing power flow model based on injected current unsuitable for meeting the application requirements.Hence,this paper proposes a power-injection equation to analyze and quantify the transfer characteristics associated with voltage unbalance.Initially,the generation and transfer mechanism of voltage unbalance within the bipolar DC distribution network is studied.The voltage unbalance transfer matrix grounded on sensitivity is established to depict the transfer characteristics of voltage unbalance factors at individual nodes.Furthermore,the analytical formulations for each component of the voltage unbalance transfer matrix are derived,and a power flow calculation technique based on the Newton-Raphson method is proposed for determining the matrix.The suggested method employs a power-injection equation for power flow modeling and integrates droop control and comprehensive load models of distributed generation.Finally,the effectiveness of the proposed approach is validated via the modified IEEE 33-node test system.Three case studies are conducted.Numerical results reveal the following findings.(1)The proposed power flow calculation method exhibits a negligible sacrifice in accuracy,with no more than a 0.83%deviation and a calculation efficiency enhancement of 44%.Additionally,it offe

关 键 词：电压不平衡 传递 双极直流配电网 灵敏度 牛顿-拉夫逊法 

分 类 号：TM744[电气工程—电力系统及自动化]