Mathematical Modelling of PV Module With multilevel 3-Ø inverter using SPWM technique for Grid application

Abstract

This paper presents a simple step-by-step procedure for the simulation of photovoltaic modules with Matlab/ Simulink as well as Grid connected system for considering Three phase multistring inverter with sinusoidal pulse width modulation control scheme. The single -diode equivalent circuit is employed in order to Investigate I-V and P-V characteristics of a solar module. This paper focuses on a Matlab/SIMULINK model of a photovoltaic cell and Grid connected system, considering three phase multistring inverter with SPWM control scheme to reduce harmonics in primary side and same was applied to grid with prediction of PV cell behaviour under different physical and environmental parameters. The PV model is based on mathematical equations and is described through an equivalent circuit including a photocurrent source, a diode, a series resistor and a shunt resistor. The developed model can also be used to extract the physical parameters for a given solar PV cell as a function of temperature and solar radiation. Three PV strings are cascaded together in parallel configuration and connected to a five-level inverter to produce output voltage in five levels of Vdc. That was equivalent to the amplitude of the triangular carrier signal were used to generate PWM signals for the switches. The inverter offers much less total harmonic distortion and can operate at near-unity power factor.