The harmonic probability distribution of power grid with multi-harmonic sources

Abstract

In this paper, each harmonic value of harmonic sources is obtained in the process of the measured data obtained from power quality monitoring system first. And then, probability distribution of harmonic amplitude are achieved based on maximum entropy method. Considering that the phase distribution is associated with amplitude, a method of dividing amplitude into three parts by expectation and standard deviation is proposed and the phase probability distribution of the corresponding part can be obtained. For non-measured point, a probability distribution method using the aforementioned calculated probability distribution and the mutual impedance between non-measured point and harmonic source is proposed. Finally, fitting error parameters are used to evaluate the fitting effect of probability distribution which prove the feasibility of the method.