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System Harmonic Impedance Calculation Method Based on Complex Linear Regression and Data Filtering

Because of the fluctuation of the system background harmonic, it is difficult to obtain the system harmonic impedance accurately. According to characteristics of the dominant fluctuation, linearity and continuity of the system harmonic impedance, a novel system harmonic impedance calculation method has been developed, combined with a fluctuation filtering technique, linear correlation test and outlier elimination technique. Field test results show that the proposed method is practical and accurate so that it can be used to determine the system impedance.