联合三相锁相环和优化三点法的供电频率高精度测量算法  

High-precision power-frequency measuring algorithm combining three-phase PLL and optimized three-point method

作　　者：王硕禾[1] 许继勇[2] 蔡清亮[1] 许惠敏[3] 

机构地区：[1]石家庄铁道大学电气与电子工程学院,河北石家庄050043 [2]上海理工大学光电信息与计算机工程学院,上海200093 [3]北京铁路局石家庄供电段,河北石家庄050000

出　　处：《电力自动化设备》2012年第1期88-92,共5页Electric Power Automation Equipment

基　　金：北京铁路局2010科技攻关重点项目(JTK-GD-04)~~

摘　　要：针对客运专线电能质量检测装置中频率测量算法精度低、计算量大和精度易受谐波成分影响等不足,提出一种以三相锁相环和三点法为核心的高精度频率算法。该方法利用三相锁相环提取频率信号,可有效克服频漂,减少所提取频率信号与理论基波信号间的偏差。详细推导了三点法求频率所带来误差的理论原因,进而得到误差抑制程度最佳时的采样点间隔,最终通过最小二乘法拟合得到频率值,进一步抑制了算法检测的误差。经多次实验证明,联合三相锁相环和优化三点法求取频率的方法,其精度和效率均优于传统频率检测算法。A high-precision measuring algorithm combining three-phase PLL（Phase Locked Loop） and optimized three-point method is proposed to improve the frequency measuring algorithm ~or trachon power supply system in precision , calculation load and immunity from harmonic components. Three-phase PLL is used to extract the frequency signal to effectively overcome frequency dritt and reduce the deviation between extracted signal and theoretical fundamental signal. The theoretical error of three-point method is derived in detail to obtain the optimal sampling interval for the best error suppression. The frequency is obtained by the least square fitting to further reduce the error. Experiments show that, the accuracy and efficiency of the proposed method is superior to the conventional frequency detection algorithm.

关 键 词：电能质量 频率测量 锁相环 三点法 优化 算法 

分 类 号：TM935[电气工程—电力电子与电力传动]