三相四线电能表失压退补电量的误差研究  

Error Research of Retrieving Electric Power Due to Voltage Loss in Three-phase Four-wire Watt-hour Meter

作　　者：邢晓敏[1] 孙成 陈劲游 商国敬 朱敏珊 Xing Xiaomin1, Sun Cheng1,Chen Jinyou2, Shang Guojing3, Zhu Minshan2(1. Electrical Engineering College, Northeast Electric Power University, Jilin Jilin 132012;2. Zhongshan Power Supply Bureau, Zhongshan Guangdong 528400 ;3. Datang Northeast Electric Power Test ＆ Research Institute, ChangChun Jilin 13000)

机构地区：[1]东北电力大学电气工程学院,吉林吉林132012 [2]中山供电局,广东中山528400 [3]大唐东北电力试验研究所有限公司,吉林长春130000

出　　处：《东北电力大学学报》2018年第4期1-7,共7页Journal of Northeast Electric Power University

摘　　要：为了研究"电压替代法"在三相电网不对称时退补电量的误差范围,采用"对称分量法"对"电压替代法"退补电量的更正功率误差进行了分析计算,导出三相四线电能表失压退补电量的更正功率在电网三相电压、电流不平衡状态下的误差表达式.根据误差表达式分析实际运行的功率因数及三相电压、电流不平衡度在一定范围变化时更正电量误差变化情况,并计算在电网相关约束条件下的误差、样机实测不平衡度的误差及某实际电网95%的三相电压幅值不平衡时的误差,结果显示其误差小于±3%.最后比较了C相电流取不同电流时,"电压替代法"和"更正系数法"的更正功率的计算误差,说明在三相不平衡负荷下"电压替代法"计算的退补电量误差远小于"更正系数法"的误差,得到的结果验证了该方法的可行性和实用性.In order to study the error range of the voltage substitution method in the asymmetry of the threephase power grid.Used symmetrical component method to do a series of analytical calculation for the correction power error of the voltage substitution retrieving electric power. The Three-phase Four-wire Watt-hour Meter loss voltage error formulas of the corrected power are derived when three-phase voltage and current are unbalanced in the power grid.Not only did it analyze the power factor of actual operation and the degree of unbalanced three-phase voltage and current changes in a certain range correction power error,but it also calculate the error of the relevant constraints in power grid,the prototype measurement error of the unbalanced degree and some 95% of the actual power grid when the unbalanced three-phase voltage amplitude error curve,the error is less than±3%.At last,compared the difference between the voltage substitution and the correction coefficient when c-phase current is different,shows that the first method is far less than the error of the correction coefficient method.The results verify the feasibility and practicability of this method.

关 键 词：电压替代法 对称分量法 三相四线电能表 失压退补电量 三相不平衡 

分 类 号：TP29[自动化与计算机技术—检测技术与自动化装置]