Research On Household-type Grid-connected Photovoltaic Control System

Due to the increasing depletion of fossil energy and characteristics of solar, such as wide distribution and abundant reservation, solar becomes an internationally recognized new energy. Household-type grid-connected photovoltaic system receives more and more people's attention. It is the future direction of development of photovoltaic industry. Therefore, the paper is about the research on household-type grid-connected photovoltaic control system.First of all, the paper presents the overall structure of grid-connected photovoltaic control system. System control program, that is pairs of closed-loop instantaneous current triangular wave comparison method, is proposed with a maximum power point tracking. Then the principles of solar cell's working and maximum power point tracking are analyzed. An improved method combining Open-Circuit Voltage and the PO with variable perturbation steps is adopted to achieve the system's MPPT control. Besides, we make a detailed analysis of inverter circuit topology and software phase-locked loop. In the end, TMS320LF2407 is used as a system control chip, and the system's function modules are analyzed in detail, and its implementation processes are presented.