Discussing Multiple Topologies for Mitigating THD of Load Voltage Profile

Abstract

In traditional power systems, power quality is defined as the quality of voltages as supplies are voltage sources rather than current sources. In the renewable energy based power systems, inverters and loads/grid are two major sources of harmonics. This paper provides the comprehensive mechanism and performance comparison of three different strategies, applied for reducing the THD_v (voltage total harmonic distortion) of load voltage profile. The strategies, which are BHCC (Bypassing harmonic current components), HDC (harmonic droop control), integral controller and resonant impedance are thoroughly discussed and applied to the robust droop control model of single phase inverters. The FFT (fast fourier transform) analysis is carried out for aforementioned strategies to evaluate the THD reduction in the load voltage profile. Matlab/Simulink plateform is used to simulate the models, equipped with different strategies.