Topological Structure of Large-scale Photovoltaic Array and its MPPT Controlling Method

The “hot spot” problem, which is usually caused by the partial shading environmental conditions, threatens the safety operation of a photovoltaic system seriously. In this paper, a novel topological structure and its maximum power point tracking (MPPT) model and algorithm are researched to solve the “hot spot” problem in a large-scale photovoltaic system. Numerical result shows that with the application of the proposed structure and MPPT method, the large-scale photovoltaic system can achieve the minimum control unit (MCU) level MPPT, conquer the “hot spot” problem, and improve output power under complex environmental conditions significantly.