A Coordinated Charging Strategy for Electric Vehicle Three-phase Load Balance

Q1 Engineering 电力系统自动化 Pub Date : 2015-09-30 DOI:10.7500/AEPS20150402012
Zhan Kaiqiao, Hu Zechun, Song Yong-hua, X. Zhiwei, Jia Long, Zhang,Hongcai
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引用次数: 9

Abstract

Three-phase unbalance may occur in distribution networks with large-scale charging loads of electric vehicles (EVs) plugged in, which significantly threatens the operation of power networks. Most coordinated EVs charging strategies are based on the assumption of single-phase power networks to the neglect of three-phase unbalance problems. A coordinated charging strategy for EVs considering three-phase load balance is proposed. In the outer layer of the proposed strategy, the three-phase backward/forward sweep load flow algorithm is used to iteratively update the node voltages. In the inner layer of the proposed strategy, a three-phase coordinated EV charging optimal model is created and solved based on the updated node voltages. By optimizing the charging power and charging periods of EVs, the objectives of the optimal model, power loss reduction and the three-phase load balance, are achieved. Simulation results show that the proposed strategy can eliminate the three-phase unbalance problems, reduce power losses and flatten the load curve, guaranteeing the economics and security of operation of the power network.
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电动汽车三相负载平衡协调充电策略
在大量电动汽车充电负荷的情况下,配电网会出现三相不平衡现象,严重威胁电网的运行。大多数电动汽车协调充电策略都是基于单相电网的假设,忽略了三相不平衡问题。提出了一种考虑三相负载平衡的电动汽车协调充电策略。在该策略的外层,采用三相后向/前向扫描潮流算法迭代更新节点电压。在该策略的内层,建立了电动汽车三相协调充电优化模型,并根据更新后的节点电压进行求解。通过对电动汽车充电功率和充电周期的优化,实现了优化模型的目标,即减少功率损耗和三相负载均衡。仿真结果表明,该策略能有效消除三相不平衡问题,减少电力损耗,平稳化负荷曲线,保证电网运行的经济性和安全性。
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来源期刊
电力系统自动化
电力系统自动化 Energy-Energy Engineering and Power Technology
CiteScore
8.20
自引率
0.00%
发文量
15032
期刊介绍: Founded in 1977, Power System Automation is a well-known journal in the discipline of electrical engineering in China. At present, it has been issued to all provinces, cities, autonomous regions, Hong Kong, Macao and Taiwan, and abroad to dozens of countries in North America, Europe and Asia-Pacific region, with a large number of readers at home and abroad. Power System Automation takes “based on China, facing the world, seeking truth and innovation, promoting scientific and technological progress in the field of electric power and energy” as the purpose of the journal, mainly for the professional and technical personnel, teachers and students engaged in scientific research, design, operation, testing, manufacturing, management and marketing in the electric power industry and higher education institutions as well as electric power users, and focuses on hotspots of the industry's development and the It focuses on the hot and difficult issues of the industry. It focuses on the hot and difficult issues of the industry, both academic and forward-looking, practical and oriented, and at the same time emphasizes and encourages technical exchanges of experiences, improvements and innovations from the front line of scientific research and production.
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