Harmonic Responsibility Division Method for Microgrid

Abstract

Heavy-permeability power electronics make the harmonic sources more complex in microgrid. In order to accurately evaluate the issue of harmonic responsibility generated by distributed generations and individual customers, this paper proposes a method of harmonic responsibility division based on ideal load current. There are two indices named ideal load current and the non-ideal load current are defined according to the ideal load characteristics. Depending on the harmonic voltage propagation characteristics of distributed generation and non-linear load, the ideal load parameters of microgrid are calculated by analyzing multiple harmonic source equivalent networks of microgrid from the perspective of individual customers, and the harmonic current generated by background harmonic voltage is decoupled from the ideal load current under the condition of deterioration of the voltage waveform, and the load harmonic current is decoupled from the non-ideal load current to realize the harmonic responsibility division of the microgrid. The proposed method does not need to calculate the network structure and system impedance information. Several cases of simulation analysis prove the validity and rationality of this method.