测量用电子式互感器的延时补偿设计  

Delay Compensation Design for Electronic Measuring Transformer

作　　者：朱超[1] 梅军[1] 黄灿[1] 倪玉玲[1] 郑建勇[1] 

机构地区：[1]东南大学电气工程学院,江苏省南京市210096

出　　处：《电力系统自动化》2013年第21期184-189,共6页Automation of Electric Power Systems

摘　　要：针对电子式互感器现有定值延时补偿算法的不足,提出了一种动态补偿采样值相位差并提高电子式互感器相位精度的方法。首先,分析了电子式互感器相位差的产生原因,根据延时位移的不确定性,给出了利用合并单元实时测算延时位移并动态校正的补偿方法。采用了坐标旋转数字计算机(CORDIC)算法实现平面坐标旋转与开方计算,并将CORDIC算法模块的迭代结构在现场可编程门阵列(FPGA)内优化为流水线结构,提高了算法的时速性,减少了额外延时的引入。最后,通过仿真和电子式互感器校验仪验证了改进的相位补偿方法可以提高测量用电子式互感器的相位精度。To overcome the shortcomings of existing delay compensation of the electronic transformer, a dynamic phase compensation algorithm of sampled value is proposed. First, the process of phase difference generation is explained. Then, a method of real-time calculating and dynamic correcting the phase difference within the merging unit is presented according to the uncertainty of delayed displacement. Coordinate rotation digital computer （CORDIC） based plane coordinate rotation and square root calculation are dealt with. Meanwhile the corresponding pipeline structure in field programmable gate array （FPGA） is optimized, improving the algorithm speed and reducing additional delay. Simulation and experiment results through the electronic transformer calibration system have verified the proposed method is able to improve and enhance the phase accuracy of the electronic measuring transformer.

关 键 词：电子式互感器 相位差 延时补偿 坐标旋转数字计算机(CORDIC)算法 现场可编程门阵列(FPGA) 

分 类 号：TM45[电气工程—电器]