Research And Design Of Single Phase Photovoltaic Grid Connected Inverter

With the world energy and environmental problems becoming more severe, solar energyhas become the focus of energy development in the world.. To better and more comprehensiveutilization of solar energy, solar photovoltaic grid connected system is the best choice for along time now and even in the future. And the PV grid connected inverter is one of theimportant factors for the PV grid connected power generation system, so the research ofphotovoltaic grid connected inverter is of great practical significance.In depth study and research the DC to DC voltage, DC to AC full bridge invertertechnology, MATLAB and circuit simulation technology, digital signal processing technology,signal sampling technology, photovoltaic maximum power point tracking technology,DSP2812application technology and related technology is designed and made a power is1kW improved photovoltaic grid connected inverter.In this thesis, the photovoltaic grid connected inverter is mainly divided into the maincontrol unit, the boost and the inverter unit, the driving unit, the sampling unit, etc.. Amongthem, the core control chip for the TMS320F2812chip. This design uses the two levels of thepre-step boost and the back-level inverter, and combines the auxiliary power supply, driver,sampling and other circuits, and then auxiliary to protect the hardware design of the wholesystem. In addition, the maximum power tracking algorithm is studied and analyzed, and thedisturbance observation method is improved and perfected, and the system is more efficientand more stable.. The paper also analyzes the operation flow of each module in the system,and completes the program of the system.. Finally, the stability and reliability of the prototype are tested and analyzed. The results show that the system can run normally and meet thedesign requirements.