Three-Phase Photovoltaic System With Three-Level Boosting MPPT Control

Abstract

This paper proposes a three-phase photovoltaic (PV) system with three-level boosting maximum power point tracking (MPPT) control. A simple MPPT control using a power hysteresis tracks the maximum power point (MPP), giving direct duty control for the three-level boost converter. The three-level boost converter reduces the reverse recovery losses of the diodes. Also, a weighted-error proportional and integral (PI) controller is suggested to control the dc link voltage faster. All algorithms and controllers were implemented on a single-chip microprocessor. Experimental results obtained on a 10-kW prototype show high performance,such as an MPPT efficiency (MPPT effectiveness) or 99.6%, a near-unity power factor, and a power conversion efficiency of 96.2%.