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    基于广义谐波小波的工频功率因数测量算法

    2016-03-03 中国测试张 媛1,2, 王 楠3
    摘  要:针对传统功率因数测量方法存在的问题,基于广义谐波小波的优良特性,结合功率因数定义,提出测量工频功率因数的广义谐波小波算法。该算法通过对采样离散化后的电压与电流信号进行工频提取,然后对其进行重构,最终结合功率因数定义来实现。建立算法的数学模型,对其进行仿真分析,最后通过液压系统实验对算法进行验证,提取出完全基于工频的功率因数。分析结果表明:与其他算法特别是与正交小波相比,基于广义谐波小波的工频功率因数测量算法速度快、精度高,测量误差<3.5%,具有较好的工程实用价值。
    关键词:广义谐波小波;功率因数;快速傅里叶变换;Mallat算法
    文献标志码:A       文章编号:1674-5124(2016)01-0016-05
    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,
    Shanghai 200240,China;
    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
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