高次谐波对测控装置测量影响解决方案设计与实现  

Solution Design and Implementation for BCU Measurement Effected by High Harmonics

作　　者：朱何荣[1] 王敏[1] 孙颂林[1] 朱英魁[1] 陈桂友[1] 

机构地区：[1]南京南瑞继保电气有限公司,南京211102

出　　处：《电气技术》2016年第12期53-58,共6页Electrical Engineering

摘　　要：为解决高次谐波引起的频谱混叠,测控装置一般会在采样前端增加低通滤波器,本文针对测控装置采用低通滤波器引起的2~15次谐波衰减问题,以及传统的固定补偿方式在频率偏差情况下的局限性,设计了频率自相关补偿算法,根据实际计算频率进行幅值和相位的实时补偿,从而保证了电压电流功率有效值以及15次及以下谐波计算的精度。同时,针对高次谐波对频率计算的影响,设计了旋转向量频率测量方法,有效解决了谐波存在导致频率计算误差较大的问题。经过测试以及现场实际应用,证明了改进方案的有效性。In order to solve the problem of spectrum aliasing caused by high harmonics, the low-pass filter（LFP） is used by the bay control unit（BCU） before sampling in general. In view of the attenuation of 2~15 times harmonics caused by the low pass filter, and the limitation of fixed compensation method, a frequency autocorrelation compensation algorithm is designed in this paper, in order to ensure the measurement precision, the real-time compensation coefficient of the amplitude and phase is calculated according to the practical frequency calculation, at the same time, in view of the high harmonics influence on frequency calculation, a rotation vector frequency measurement method is designed in this paper, increases the precision of frequency calculation effectively., the effectiveness of the improved scheme is proved through test and actual application.

关 键 词：测控装置 低通滤波器 频谱混叠 频率自相关 幅值补偿 

分 类 号：TM935[电气工程—电力电子与电力传动]