Grid Synchronisation of IVS based MPPT PV Array Using Damped SOGI Control Algorithm

Abstract

This project consists of two parts in first part detail about modified perturb & observe & input voltage sensor (IVS) algorithms,second part is about two stage grid integration of PV panel using damped second order generalised integrator (SOGI) algorithm.Conventional perturb & observe MPPT algorithm use PV panel voltage and current to vary duty ratio dc-dc converter such that maximum power is extracted from PV panel.IVS based algorithm PV panel voltage alone to track maximum power point of PV panel.These two algorithms are simulated using MATLAB/Simulink for rating of PV panel in laboratory. SEPIC converter is used for interfacing PV panel and dc load.Experimental setup of two algorithms are implemented & experimental results are compared with simulated results. A detailed comparison is made between two algorithms. In grid integration of PV module using damped SOGI algorithms, maximum power is extracted from PV module by varying duty ratio of dc-dc chopper by using IVS based algorithm. A three phase Voltage source converter is used for synchronisation. Along with supplying power to grid this control algorithm also improve power quality by injecting current to grid at unity power factor. Triggering pulses for VSC are given by comparing estimated grid current with actual grid current using hysteresis control.PV array grid integration by damped SOGI algorithm is simulated using MATLAB/Simulink.