The Design Of Grid-connected Photovoltaic Inverter Based On The Isolated Of Line Frequency

As one of the optimal new energy sources, the solar energy has been applied more and ore widely by the human, and the grid-connected photovoltaic inverter is one of the necessary equipment of the grid-connected photovoltaic system.The grid-connected photovoltaic inverter is a equipment which changes the DC from the solar cell to AC according with the public grid and transports to the public grid, according to different standard, the structure of the grid-connected photovoltaic inverter is divided to many kinds, This article introduces a kind of line frequency isolated inverter.In this article, the hardware design of the main circuit and control circuit,the component selection and parameter selection are introduced in detail. It has introduced each control mode of the grid-connected inverter and has a comparison among them. The digital signal processor 56F8036 of FREESCALE company is the most control chip of the system. It introduces the function and characteristic of the chip, analysis the system software design, including the emergency of SVPWM wave, MPPT (Maximum Power Point Tracking) and the anti-islanding detection technology. Finally, experiments the system, the experimental results show that the system satisfied the designed needs.