| 引用本文: | 王硕禾,许继勇,蔡清亮,许惠敏.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[J].电力自动化设备,2012,32(1): |
| WANG Shuohe,XU Jiyong,CAI Qingliang,XU Huimin.High-precision power-frequency measuring algorithm combining three-phase PLL and optimized three-point method[J].Electric Power Automation Equipment,2012,32(1): |
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| 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。 |
| 关键词: 电能质量 频率测量 锁相环 三点法 优化 算法 |
| DOI： |
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| 基金项目:北京铁路局2010科技攻关重点项目（JTK-GD-04） |
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| High-precision power-frequency measuring algorithm combining three-phase PLL and optimized three-point method |
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WANG Shuohe1, XU Jiyong2, CAI Qingliang1, XU Huimin3
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1.School of Electrical and Electric Engineering，Shijiazhuang Tiedao University，Shijiazhuang 050043，China;2.School of Optical-Electric and Computer Engineering，University of Shanghai for Science & Technology，Shanghai 200093，China;3.Shijiazhuang Power Supply Section Beijing Railway Bureaus，Shijiazhuang 050000，China
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| Abstract: |
| 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 for traction 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 drift 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. |
| Key words: power quality frequency measurement phase locked loops three-point algorithm optimization algorithm |
