Different Converter Integration and Performance Assessment of a Multi-Stage Transformer Less Grid Tie Inverter Using Thin Film PV Array

Abstract

This article introduces a grid-tied, single-phase, high-frequency-link photovoltaic inverter (GTI). The signal for the sinusoidal pulse width modulation (SPWM) control of a typical GTI must be produced by a highly advanced digital signal processor. In this paper, various boost converter's duties include and analyze to boost the dc voltage and preserving the maximum power point tracking (MPPT) algorithm. The main functions of the inverter are to synchronize the grid and to invert the increased dc voltage at a high switching frequency. The inverter power density is increased by both circuits' high frequency (HF) operation. No bulky interstage transformer is needed for the proposed inverter. As a result, the size and dependability of the system are increased while the magnetizing and copper losses are decreased. Through calculations and prototype trials with a photovoltaic (PV) array, various operational scenarios were examined to confirm the proposed system's performance.