A new power stage architecture and control scheme to optimize maximum power point tracking for photovoltaic systems

This paper proposes a new approach to efficiently track the desired maximum power point for photovoltaic systems under partial shading conditions. The power stage architecture achieves fast input current change rate by combining a current-adjustable converter with a few converters operating at a constant input current. By taking advantage of fast current change, the control scheme effectively combines perturb-and-observe (P&O) tracking and periodic global maximum power point (MPP) searching, and fulfills fast tracking as well as maintaining ease of implementation.