A global MPPT algorithm for existing PV system mitigating suboptimal operating conditions

摘要: Abstract Under the partial-shading condition, voltage-current characteristics of a series-connected solar panel strings are different from that single panel. Instead having maximum power point (MPP), they exhibit multiple MPPs. It is thus crucial to operate string at global MPP (GMPP). A large body literature has been devoted techniques for locating GMPP. However, those typically require knowing characteristics, adding extra sensing components and circuits, and/or causing output interruption. In order deal with these issues, two-step algorithm tracking GMPP proposed. The first step determines voltage which appears. based on extracting power-voltage through varying input impedance processing unit determine approximate location second exact formulating two quadratic functions, namely static fictitious then calculating intersection functions implemented 3 kW grid-connected inverter. As proposed method does not modifying hardware it can be immediately integrated into existing photovoltaic systems.