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In this paper, the problem of the low pass filter is difficult to achieve the response speed and the accuracy balance of the test based on the ip – iq traditional harmonic current detection algorithm based on the instantaneous reactive power theory, and the method of improving the method of the low pass filter based on Sa-function characteristics is proposed. Then, according to the model, the filter is optimized by combining the ratio integral. Finally, the simulation is carried out. The simulation results show that the low pass filter based on the Sa-function characteristics can improve the real-time and accuracy of the harmonic detection.

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