A modified H-bridge multilevel inverter for photovoltaic system

Abstract

This paper presents a modified H-bridge seven-level single-phase grid-connected inverter for photovoltaic system with a novel pulse-width-modulated (PWM) control scheme. The inverter is capable of producing seven output-voltage levels (V_dc, 2V_dc/3, V_dc/3, 0, -V_dc, -2V_dc/3, -V_dc/3) from the dc supply voltage. Perturb and Observe (P&O) algorithm is used to extract maximum power from the PV module. MPPT and current control algorithm were implemented in an eZdsp board, TMS320F2812. The proposed system was implemented in a prototype.