Abstract：In order to measure the harmonic power, this paper firstly proposes a new algorithm based on discrete Fourier series. The following error analysis presents that under asynchronous sampling, this algorithm cause large harmonic power error, which is proportional to the frequency fluctuation of the electricity grid system. Then this algorithm is optimized by modifying the set of triangular basis functions and adopting the quasi-synchronous iteration method, along with the simplification of the computation. The simulation results reveal that the proposed algorithm can adapt to the±0.5Hz fluctuation of the grid frequency and reach the accuracy of 10-6 under the steady-state condition. In addition, the harmonic energy measurement maintains higher accuracy than that of the contrast algorithm under the quasi-steady-state condition, validating the effectiveness of the proposed algorithm.
肖勇, 赵伟, 黄松岭. 基于离散傅里叶级数的非同步采样波功率测量算法[J]. 电工技术学报, 2018, 33(7): 1570-1578.
Xiao Yong, Zhao Wei, Huang Songling. Harmonic Power Measurement Algorithm Based on Discrete Fourier Series in Asynchronous Sampling. Transactions of China Electrotechnical Society, 2018, 33(7): 1570-1578.
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