Measuring algorithm for power frequency factor based on
general harmonic wavelet
ZHANG Yuan1，2， WANG Nan3
（1. School of Electronic Information and Electric Engineering，Shanghai Jiao Tong University，
2. Engineering Department of 705 Research Institute，CSIC，Shanghai 200245，China；
3. School of Mechanical Engineering，Shanxi University of Technology，Hanzhong 723001，China）
Abstract: To solve the existing problems of traditional power factor measuring methods, general harmonic wavelet is proposed to measure the power factors based on the features of the general harmonic wavelet, i.e., zero phase-shift, the sampling frequency and points of data series that remain unchanged at different decomposition scales, as well as the definition of power factors. The operating procedure of the algorithm is as follows: First, the discretized voltage and current signals are extracted in power frequency; Second, the results obtained are reconstructed; third, it is measured with the definition of power factors. Besides, a mathematical model is established for simulation analysis. Then, the algorithm is verified through hydraulic system tests and the power frequency factor is obtained. The analyzing results have shown that the algorithm is fast and precise less than 3.5% in terms of measuring errors compared with other algorithms (especially orthogonal wavelet), it can be applied in some engineering fields.
Keywords: general harmonic wavelet； power factor； FFT； Mallat algorithm