Independent Photovoltaic Power Generation System Control Strtegy Based On FPGA

New energy research has become a hot topic.Because even if the energy is facing a crisis, but the economy is still to be developed. Solar power because of its rich reserves clean energy etc has been widespread concern. Early in the study of solar power also faces many problems, such as the high cost of photovoltaic cells, low power generation efficiency,these problems have seriously restricted the development of solar power. Improve the efficiency of solar power and reduce costs is the main way to solve these problems in the present circumstances.This system is a stand-alone PV power generation system, in which each part of the control can be relatively independent, Therefore FPFA as the controller. Each part as a module to control,in parallel to improve system speed. Pspice in the conduct peripheral hardware circuit simulation; written in quartus ⅱ Verilog HDL language for hardware control system programming and waveform simulation, and DE2development board to use SignalTap_Ⅱ logic analyzer for online authentication.In this paper, the main content:(1) Select the operating mode of the stand-alone PV power generation system by needs analysis.(2) Sunlight tracking system designed to improve the conversion efficiency of photovoltaic cells. Simulation analysis to select the single-axis tracking system to verify the feasibility of photovoltaic cells as light intensity sensor. By a stepping motor as the implementation of the components, only to detect a signal of the light intensity can be achieved ray tracing control.(3) Through the detection of PV cells output power, the switch duty cycle adjust the amount of perturbation and observation method based on fuzzy control, the BOOST circuit to achieve maximum power tracking, and improve the output power of PV modules.(4) The main goal, to stabilize the DC bus voltage to selected bi-directional DC/DC converter to control the charging and discharging of the battery through the line, battery components, photovoltaic electricity between the battery components and load management. Among them, the duty cycle value terms control the charging and discharging process conversion to achieve a smooth transition.(5) Push-pull circuit to achieve the boost of the DC bus by adjusting the duty cycle to achieve closed-loop control, the output voltage stable. Among them, the two symmetric modulation wave with the same triangular carrier control the output of two control signals, and omitted the dead time settings.(6) Unipolar SPWM inverter full-bridge circuit, and by adjusting the scheduling value voltage closed-loop control, the stability of the output voltage.