Research On Control Strategy Of Two-stage Grid-connected Photovoltaic System

With the energy of tension and worsening environmental pollution, development and utilization of solar energy has been more and more attention. Photovoltaic power generation is an important form of solar energy utilization. With the development of photovoltaic power generation, photovoltaic power generation has been the world’s attention.Based on the analysis of the electrical characteristics photovoltaic cells, the most deeply discuss the power tracing control strategy, and puts forward the method of constant voltage and electrical incremental technique combining control method. Through to the hysteresis current control algorithm and the principle of switching frequency wave analysis of the causes, and put forward based on the integral method of the fixed frequency hysteresis current control algorithm. Three-phase photovoltaic (PV) grid system often three-phase half bridge topology of the grid inverter realize grid, because the three-phase switch control mutual interference, so this paper research the three phase decoupling control, and put forward based on the line current of decoupling algorithm. The two three-phase grid generation system of grid control strategy, to achieve the maximum power tracking and MPPT control and fixed frequency hysteresis control of the combined.Through the MATLAB simulation proves this the most power tracing control method and the grid the feasibility and effectiveness of the control strategy, for photovoltaic (PV) grid power provides a highly efficient and advanced control strategy for developing efficient and advanced photovoltaic (PV) grid generation controller provides good theory method.