Multi-mode MPPT control for improved efficiency

Abstract

A multi-mode maximum power point tracking (MPPT) control for wide photovoltaic (PV) voltage range and improved efficiency is proposed in this paper. This MPPT control is fitted for the two-stage PV power system which is composed of a step-up converter and a step-down inverter. In the low PV voltage, the step-up converter performs the MPPT. On the other hand, in the high PV voltage, the inverter performs the MPPT control. The proposed MPPT control makes the dc link voltage low as soon as possible and improves the power efficiency under the wide PV voltage range.