Master Slave Topology for Parallel Operation of Renewable Energy based Distributed Generator

Abstract

This paper presents an effective control methodology to integrate multiple photovoltaic (PV) based distributed generator (DG) in microgrid. In general, the multiple PV based DG will operate in parallel and the rating of each PV unit is defined by the rating of the corresponding DC-DC converter. Each PV units operates independently with respective to the controller of the dc-dc converter and feeds power to the common bus. In this paper, a master slave control methodology is proposed to integrate multiple PV units with a single maximum power point tracking (MPPT) controller. In the proposed master slave approach, one PV unit is considered as master unit which is controlled through MPPT algorithm and voltage control method. Other PV units are considered as slave units and operate with current control without MPPT control. Compared with the traditional methods available in the literature, the proposed methodology reduces the complexity and controller cost of the parallel operation of multiple PV based DG system. Simulation and experimental results verify its feasibility.