Interval Estimation of Multiple Harmonic Source Responsibility Based on Tolerance Approach

Traditional harmonic responsibility determination methods require synchronous measurement data of harmonic voltage and current, which limits their engineering applications. In view of the characteristics of existing harmonic monitoring devices, this paper proposes a method to determine the interval of multiple harmonic source responsibility based on the statistical harmonic monitoring data. First, considering the fluctuation characteristics of harmonic sources, and an interval responsibility quantization equation is established. Secondly, the Skew-Normal Mixture of Experts clustering algorithm is used to divide the harmonic operation scenario, ensuring that the fluctuation of harmonic impedance and background harmonic voltage remain within a small range for each scenario. Meanwhile, the parameters of interval responsibility quantization equation are identified utilizing the tolerance approach, and then the interval of harmonic responsibility is quantitatively evaluated. Finally, the feasibility and effectiveness of the proposed method are verified through simulation examples.