摘要
电动汽车优化充电对配电网的安全经济运行具有十分重要的意义.利用配电网辐射状运行结构采用迭代修正节点电压的方法能够大幅降低优化变量的维数,提高计算速度.该方法已被应用于以网损最小为目标函数、常规负荷模型为恒功率负荷、不计及节点电压、支路功率约束的三相平衡配电网中.该文提出了将其推广至一般情形的方法,目标函数为配电网供电能量最小、运行费用最小或利润最大,不再局限于网损最小,负荷模型不再局限于恒功率负荷.而且计及了配电网的三相不平衡、节点电压、支路功率约束.文中分析了负荷模型对优化计算结果的影响.研究发现,当负荷模型只包含恒功率、恒阻抗负荷时,每次迭代中优化模型仍为线性约束凸二次规划模型;当负荷模型包含恒电流负荷时,每次迭代中优化模型不再为线性约束凸二次规划模型,但仍为线性约束凸规划模型.3个算例的仿真结果表明,所提方法收敛性好、计算精度高、速度快,能够改善电压,提高配电网的经济效益.
Coordinated charging of electric vehicles is critical to provide safe and cost effective operation of distribution systems.Utilizing the radial operation structure of distribution network,the method that by correcting the nodal voltages iteratively,can be applied to improve calculation speed.This method has been proposed to minimize the power losses in the balanced distribution network in literature.However,the load model is assumed to be constant power load.The constraints on nodal voltages and thermal loadings of lines and transformers are not taken into account.In this paper,the method that extends this iterative technique to the general case is proposed.As a consequence,the objective function is no longer confined to minimization of power losses.Furthermore,load model,the imbalance of distribution network,constraints on nodal voltages and thermal loadings of lines and transformers are taken into account.Moreover,the impact of the model of conventional load on this method is investigated.It is found that,if the conventional load is composed of constant power and/or constant impedance load,the linearly constrained convex quadratic programming model can be still applicable at each iteration.Nevertheless,if the conventional load contains constant current load,the linearly constrained convex quadratic programming model cannot be applicable any more.Instead,a linearly constrained convex programming model can be applicable.The precision and high calculation efficiency of the proposed method is validated with some test cases.
作者
张剑
姚潇毅
尹柏强
何怡刚
ZHANG Jian;YAO Xiao-yi;YIN Bai-qiang;HE Yi-gang(School of Electrical Engineering and Automatic,Hefei University of Technology,Hefei Anhui 230000,China)
出处
《控制理论与应用》
EI
CAS
CSCD
北大核心
2018年第7期1009-1020,共12页
Control Theory & Applications
基金
国家自然科学基金重点项目(51637004)
国家自然科学基金项目(51577046)
国家自然科学基金青年科学基金项目(61501162)
中国博士后科学基金项目(2016M602003
2015M571926)
安徽省自然科学基金项目(1708085QE109)
国家重点研发计划"重大科学仪器设备开发"项目(2016YFF0102200)
博士点专项资助基金项目(JZ2015AGBZ0095)
无损检测技术教育部重点实验室(南昌航空大学)开放基金项目(JZ2015SJSY0018)资助~~
关键词
电动汽车
优化充电
配电网
凸规划
负荷模型
electric vehicles
smart charging
distribution system
convex programming
load model
作者简介
张剑(1982–),男,博士,讲师,主要研究方向为分布式电源、主动配电网优化、电动汽车充电策略等,E-mail:z jj1219@sina.com。;姚潇毅(1990–),男,硕士研究生,主要研究方向为电动汽车充电桩规划,E-mail:y 901006@sina.com。;尹柏强(1984–),男,博士,讲师,主要研究方向为复杂电磁环境分析与评估、RFID射频信号处理、电能质量先进检测与控制方法等,E-mail:yinbaiqiang123@163.com。;何怡刚,通信作者.E-mail:18655136887@163.com;Tel.:+86 18655136887.(1966–),男,博士,教授,主要研究方向为电力系统故障诊断、电能质量分析等。
