The Design Of PV Grid-connected Generation System Based On TMS320LF2401 DSP

PV grid-connected power generation is the tends of the application and development of solar PV power generation .The strategic point of PV Power generation is improving the conversion efficiency and prime cost reduction. This paper is the study of the grid-connected power generation system which is based on the TMS320LF2401 DSP chip. It deals with the design of main inverter circuit and control circuit, and the selection of control methods, etc.PV grid-connected inverter is one of the components of PV grid-connected power generation system. Which adopts H-bridge inverter circuit. It can change the output direct-current voltaic of solar cell into sine voltaic with the frequency of 50Hz, and then goes through the inductance filter and the power frequency transformer to be changed into the standard sine waveform voltage of 220V/50Hz, and at last into the net. The core of control circuit is the digital singal controler TMS320LF2401 DSP chip made by the Texas Instruments Incorporated. Which adopts SPWM control methods. Operation, control and protection of grid-connected inverter system are realized according to DSP with richer external circuit and stronger function . The system has these functions of simple circuit form, low cost, high efficiency, strong credibility, good stability and controls the higher harmonic parts of sinusoida voltaic waveform efficiently. In addition, there are maximum power point tracking and anti-islet effect function , etc.With the testing of sample machine, this PV grid-connected power generation system can output stable sine alternating voltage of 220V/50Hz.Moreover, the function of tracking electric network voltage smoothly , lower amounts of harmonic wave, and quick dynamic response are all come true.