中国电机工程学报2018，Vol.38Issue(3)：762-769,后插11,9.DOI:10.13334/j.0258-8013.pcsee.170666
基于移频滤波的频率测量方法
Frequency Measurement Algorithm Based on Frequency Shift and Filtering
摘要
Abstract
Since the frequency fluctuation exists the actual power system which makes the strictly synchronous sampling condition can hardly meet, the frequency and other parameters of the power system are difficult to accurately measure. To deal with this problem, a novel frequency measurement algorithm based on frequency shift and filtering is proposed by this paper. By simply shifting the frequency components of the original signal and passing the shifted signal through a filter, the frequency of the power system can be obtained accurately. Compared with typical frequency measurement methods in the time domain, the proposed algorithm has small computational complexity, real-time and simple algorithm. Besides that, compared with traditional Fourier algorithm and its improved methods, our algorithm does not require solving equations and windowed interpolation operations and can effectively overcome the drawbacks of traditional Fourier algorithm which are spectrum leakage and fence effect. The proposed method has been tested under the conditions of fundamental frequency fluctuation, different sampling frequencies, different sampling points, various word-length of the analog to digital converter and different signal-to-noise ratios, respectively. The simulation results show that the proposed algorithm can achieve the accurate measurement of the power system frequency and effectively inhibit white noise interference. The application in an experimental test platform verified the accuracy and reliability of the proposed method.关键词
电力系统/频率测量/移频/滤波/噪声Key words
power system/frequency measurement/frequency shift/filtering/noise分类
信息技术与安全科学引用本文复制引用
李建闽,滕召胜,吴言,王永..基于移频滤波的频率测量方法[J].中国电机工程学报,2018,38(3):762-769,后插11,9.基金项目
国家自然科学基金项目(51377049). Project supported by National Natural Science Foundation of China (51377049). （51377049）
