Research On The Control Of Three-level Photovoltaic Grid-connected Inverter Based On DSP And FPGA

With the rapid development of science and technology in today’s society, it is necessary for human to have the use of solar energy, especially for the use of solar power generation has always been paid great attention in many countries, and its key technology is also one of the hot pot of competition in the developed countries. Solar photovoltaic power generation is to use the photovoltaic effect of solar cells components to generate electricity, and as a kind of high efficiency, pollution-free new energy technology, it is developing very quickly.A kind of research and design on the control of three-level photovoltaic grid-connected inverter, based on DSP and FPGA dual CPU in this paper, using a32-bit floating point arithmetic TMS320F28335chip and Cyclone II series EP2C8Q208C8chip to realize the dual CPU architecture control of PV grid inverter, and the core part of the complex control algorithm is completed by the DSP28335chip, but the FPGA chip is to assist the core part to complete various extensions interface design and process all the logic design in logic system, the dual CPU architecture controller has the advantage of high operation performance and high stability.A type of NPC three-level PV grid inverter control, which is studied in this paper, adopts two level conversion circuit, and the front-end circuit realizes the pump of output voltage and MPPT control about solar cells by the means of controling the Boost circuit, moreover, the back-end circuit realizes the grid function through DC/AC transformation, which is NPC three-level photovoltaic inverter. Through building the three-level pv inverter system simulation model in the Matlab software platform, the accuracy of the control algorithm is proved. In additon, the DSP+FPGA prototype is setted up to grid experiment, and it is concluded that experimental waveforms verify the feasibility and reliability of the system.