Study On Grid-connected Photovoltaic Inverter Based On DSP

With the global rapid development and more attention to the earth environment, the demand for renewable energy has been growing. This promote the development of PV industry and PV technology.Grid-connected PV power generation is a widely promising method of solar energy utilization.Focusing on the set-up of single-phase grid-connected P V system, this paper gives theoretical analysis and applied research on the components of grid-connected PV system, the control of the booster and the inverter of the system, SPWM electric current control technique and islanding detection. It proposes a design of the grid-connected PV with low power and small volume based on DSP.The booster uses high-frequency transformer and push-pull mode is used as topology. The analysis of the work status of the push-pull circut and the voltage change of its MOSFET, as well as the circuit parameter design of MOSFET and the high-frequency transformer, are given in detail. The working principle is analyzed and applied.This paper gives an introduction to the control strategy of inverter, and a comparison of the control methods, and uses unipolar SPWM as a closed-loop PI control. It deduce the transfer function of the control modle which is belong to the designed system. Then the PI parameters can be setting. It uses full-bridge spacer ciruit to invert, make a prototype to test and verify. Islanding effect is introduced and compared at the end.