Control Method for Parallel DC- DC Converters used in Standalone Photovoltaic Power System

Abstract

The increasing trend in integrating renewable energy sources into microgrids presents challenges from the viewpoints of reliable operation and control. Paper gives outline of droop based current sharing issues of parallel DC-DC converters in standalone photovoltaic system. This paper also presents simulation of incremental conductance maximum power point tracking (MPPT) used in solar array power systems. The main drawbacks of parallel converters are poor current sharing and voltage drop. The paper describes about instantaneous droop calculation using droop index to improve the power sharing performance. The control technique is simulated using MATLAB/SIMULINK in PV system with MPPT and case study has been done with different condition. Keywords-Microgrid; droop method; incremental conductance (Income); maximum power point tracking (MPPT); photovoltaic (PV) system)