Design And Implementation Of Photovoltaic (PV) Grid System Based On The FPGA+Linux

In the background of the national vigorously advocating for clean energy, the solar energy with the characteristics of renewable, non-polluting and cleaning, which lets the other countries in the world begin to develop solar energy photovoltaic industry. With the continuous development of photovoltaic technology, how to design the photovoltaic grid system, which is stabile, with high integration and intelligent, has a very important and practical significance.In this paper, we used the single-phase photovoltaic grid system as the research object, aiming at the problem of the current photovoltaic grid system single-function, module complexity and low scalability, we proposed a method of the PV grid system based on FPGA and Linux, with which we researched and designed the FPGA controller embedded dual-CPU. In FPGA, using CPU0 running Linux system to achieve PV system monitoring function, using CPU1 to achieve photovoltaic grid control heterogeneous multiprocessor mechanism, made a low-power, high performance and intelligent photovoltaic grid system.In this paper, the PV inverter was firstly analyzed, and the overall design of photovoltaic grid system was given. By building a simulation model of the system in MATLAB/SIMULINK, the correctness of the simulation model was effective verified. The system used two-stage architecture, the Boost transform circuit was used to enhance the output voltage of the photovoltaic cell, and the MPPT control was completed in the former stage architecture, the photovoltaic inverter was achieved by the use of the dual-stage closed loop control in the later stage architecture. Secondly, this paper designed the hardware and software of the system respectively, we customized the IP core for SPWM and CAP modules in the design of FPGA CPU1 software, and in CPU0, the functional modules such as the Linux system, network servers and databases were migrated. Finally, the experimental platform for photovoltaic grid system based on FPGA and Linux was set up in this paper, the system achieved the expected requirements basically by the experimental verification, as a result, this design has a degree of reference value and practical significance.