Designed Of The Three-phase Photovoltaic Grid Control System Based On FPGA+DSP

With the development of industrial technology, the consumption of fossil fuels is increasing rapidly. The supply of coal, oil, natural gas and other fossil fuels cannot satisfy the demand of the development of human society in a long term, the emergence of the oil crisis, the coal industry fading, the human consciousness must seek new sources of energy supply as soon as possible. The solar energy has been studied and developed by human beings, especially the solar power generation technology, which has been paid great attention to. Solar energy, as a kind of renewable energy, has a great deal of energy crisis, which is inevitable to overcome the global energy crisis.In this paper, the design of a control system based on FPGA+DSP three-phase photovoltaic grid connected, the main circuit of the system including three level NPC inverter circuit, DC/DC converter circuit, a control circuit, control circuit part mainly consists of a FPGA and DSP processing cores and the corresponding signal acquisition and driving circuit. The main task of this project is to design a drive control circuit of the double processor architecture based on FPGA+DSP co using digital signal processor of the powerful data operation ability and field programmable gate array of modular structure design, fast response speed, will drive control circuit, integrated, reduces the number of peripheral circuits and components, reducing the size of the control panel, at the same time, the system performance and processing speed greatly enhance. DSP+FPGA dual CPU architecture makes full use of the advantages and characteristics of FPGA and DSP, through the two collaborative processing to improve the performance of the system. DSP has the pipelining design method, hardware multiplier, PWM module and rich design resources, very suitable for to the IGBT control algorithm design, FPGA can through the hardware implementation of logic and timing of efficient and accurate control, in AD sampling module, three-phase phase-locked loop (PLL) and the MPPT mode block design for and realize the complementary function of FPGA and DSP perfectly.System design using two stage converter structure, of the boost DC/DC converter circuit, used to improve the output voltage of the solar battery, for maximum power point tracking control. After the three-level NPC inverter circuit, realize the output voltage of the DC/AC inverter and grid connected. Use the MATLAB to simulate the three-phase photovoltaic grid system model, practicability of the system control strategy. At the same time, the MPPT module and PWM module based on FPGA platform using Modelsim waveform simulation and analysis.