Comparison of Bang Bang and PMW switching techniques for DC/AC photovoltaic converter

Abstract

The general objective of this paper is to demonstrate that simple control strategy can be implemented in photovoltaic (PV) systems. A complete PV installation is embedded under MATLAB/Simulink environment to simulate and compare two control methods. The first one is based on bang bang control (Hysteresis) and the second one is the pulse width modulation method. We are focussing in applying these simple control strategies in the case of PV system operating in a standalone mode supplying an AC load. The integration with the load is made by a “H bridge”. Specific goals are mastering and realising the complete model of the PV installation and its control algorithm (PV array, AC-DC converter, maximum power point tracking ...). Control strategies have been developed and simulated to visualise the functionality and convenience of the different control schemes of the PV system. Simulation results allow the comparison of the different control techniques with a particular attention for two criteria: the total efficiency as well as the harmonic distortion rate. Results shows that simple bang bang algorithm gives better results in terms of efficiency and harmonic distortion rate.