GRID VOLTAGE SYNCHRONIZATION FOR DISTRIBUTED GENERATION SYSTEMS UNDER GRID FAULT CONDITIONS USING FUZZY LOGIC CONTROLLER

Abstract

In this paper, synchronization of grid voltage of the distributed generation systems was proposed by using fuzzy logic controller. In order to achieve satisfactory results with such systems, it is necessary to count on accurate and fast grid voltage synchronization algorithms, which are able to work under unbalanced and distorted conditions. This paper analyzes the synchronization capability of three advanced synchronization systems: the decoupled double synchronous reference frame phase-locked loop (PLL), the dual second order generalized integrator PLL, and the three-phase enhanced PLL, designed to work under such conditions. Although other systems based on frequency-locked loops have also been developed, PLLs have been chosen due to their link with dq 0 controllers. The simulation was done by using MATLAB/Simulink software.