电动汽车充电机对电能计量的影响  

Impact of electric vehicle charger on electric energy metering

作　　者：朱学贵[1] 覃阳[1] 苏向丰[1] 郑可[2] 付志红[1] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400044 [2]重庆市电力公司电力科学试验研究院,重庆401123

出　　处：《电力自动化设备》2015年第6期52-57,共6页Electric Power Automation Equipment

基　　金：输配电装备及系统安全新技术国家重点实验室自主研究项目(2007DA10512714103)~~

摘　　要：建立考虑线路阻抗和配电变压器的电动汽车充电机模型,仿真分析了充电机直流大功率充电和脉冲充电对电能计量的影响。仿真分析结果表明:恒流充电时充电机向电网注入谐波功率,注入功率的大小随充电功率和线路阻抗的增大呈上升趋势,但总体上占基波功率比值很小,为0.012%,对电能计量造成的影响有限;充电功率变化时谐波功率的特点与恒流充电时基本相同;脉冲充电方式下,谐波电流受脉冲充电频率影响较大,高频脉冲充电时含有大量偶次谐波与间谐波,采用积分算法原理进行电能计量的误差大于0.5%。An EV（Electric Vehicle） charger model including line impedance and distribution transformer is built,and its impact on the electric energy metering is simulated and analyzed for both DC large-power charging and pulse charging modes. Results show that,during the constant-current charging,EV charger injects harmonic power into power grid,which increases along with the increase of charging power and line impedance ,but causes limited impact on the electric energy metering because the ratio of harmonic power to fundamental power is only 0.012% ;during the varying-power charging,the injected harmonic power is similar to that during the constant-current charging;during the pulse charging,the injected harmonic power is strongly affected by the frequency,when the frequency is high,the injected harmonic power contains more even-order harmonics and inter-harmonics,which causes the error of electric energy measured by the integral algorithm is larger than 0.5%.

关 键 词：电动汽车 充电机 充电 计量 谐波功率 谐波分析 非线性负荷 

分 类 号：U469.72[机械工程—车辆工程] TM933[交通运输工程—载运工具运用工程]