一种用于电子式互感器相位补偿的数字移相方法  

A Digital Phase-shift Method for Phase Compensation of Electronic Instrument Transformers

作　　者：程含渺 徐晴[1] 纪峰[1] 穆小星 陈刚[1] 田正其 胡琛[2] 

机构地区：[1]国家电网公司电能计量重点实验室(国网江苏省电力公司电力科学研究院),江苏南京210019 [2]华中科技大学电气与电子工程学院,湖北武汉430074

出　　处：《电力工程技术》2017年第2期82-87,共6页Electric Power Engineering Technology

基　　金：国家自然科学基金项目(51507091);国家电网公司科技项目:智能变电站电子式互感器复杂环境下运行性能评估关键技术研究

摘　　要：电子式互感器的采集器在采样模拟信号时一般有固定的相位误差,影响了测量准确度,需要使用移相方法校正相位误差。针对数字移相方法,提出了基于最小二乘拟合的数字移相算法,推导出了数字移相递推式,并仿真分析了移相算法的性能。结果表明,该算法均具有较高的移相分辨率和移相精度,且能保证幅值准确度。将该算法应用于基于Rogowski线圈的电子式互感器,准确度比较测试验证了该算法的可行性和有效性。A fixed phase displacement exists when electronic instrument transformers sample analog signals,which affects the measurement accuray, and needs to be corrected using phase shift method. This paper proposes a digital phase-shift method based on least-square fitting algorithm. The digital phase shifting recurrence formula is deduced,and the performance of phase shifting algorithm is simulated and analyzed. The results show that the method has a relatively high resolution and precision in phase- shifting, furthermore, it can guarantee the amplitude measurement accuracy. The algorithm is applied to the Rogowski coil based electronic instrument transformers, and the feasibility and validity of the algorithm are verified by accuracy comparison test.

关 键 词：电子式互感器 相位偏差 数字移相 最小二乘拟合 

分 类 号：TM743[电气工程—电力系统及自动化]