Mathematical Modelling and Comparative Analysis of PWM Techniques for Photovoltaic Fed HERIC Inverter

Abstract

Grid connected photovoltaic inverters play an important role to achieve an effective and efficient system with reduced total cost of the system. The photovoltaic inverters convert the dc source and delivered into the ac system. The main aim of this paper is to analyse the performance of HERIC inverter for photovoltaic applications for different Pulse-Width Modulation (PWM) techniques. The two different reference signals such as sinusoidal reference signal and trapezoidal reference signal are used. A triangular carrier signal is compared with those reference signals and generates PWM pulses. The mathematical model of HERIC inverter is developed using MATLAB/Simulink. The performance indexes used in this comparison are THD, fundamental output voltage and RMS value of output voltage.