Design and real-time implementation of SPWM based inverter

Abstract

This paper presents the design and implementation of 1kW SPWM based inverter to convert the applied DC voltage from photovoltaic array in to pure sinusoidal AC voltage according to the voltage and frequency of standard grid output i-e 220V and 50Hz. The crux of this research work is the use of an economical and advanced 16-bit PIC microcontroller to generate the popular SPWM with very high carrier frequency (in order of kHz) to control the inverter circuit. The high frequency pulses of SPWM results in smoothed filtration of inverter output into pure sine wave by using small sized capacitors and inductors as a filter. In this paper, the simulations of inverter are presented by first developing code of SPWM in MPLAB and then simulating it on Proteus software. Finally, it is real-time implemented and tested for resistive load and the output voltage and current are displayed on LCD.