MODELLING AND SIMULATION OF A GRID-CONNECTED PHOTOVOLTAIC SYSTEM USING P&O MPPT AND SVPWM-CONTROLLED VOLTAGE SOURCE INVERTER

This paper presents detailed model of PV cell connected to the three phase utility grid connected voltage source inverter. Here perturb and observe (P&O) algorithm is implemented to track the maximum power point, even in cases of rapidly changing atmospheric conditions like varying temperature and solar irradiation. Space vector pulse width modulation technique is used to generate the switching sequence of the inverter. It is easy to implement, smooth inverter operation and provides low harmonics at the inverter output. The theoretical analysis of the system has been verified by the MATLAB computer simulation in terms of the inverter voltage, grid voltage, grid current, dc link voltage, active power delivered to load and total harmonic distortion of load current waveforms.