Single-Phase Non-Isolated Photovoltaic Inverter

Solar energy,as a renewable,harmless,safe and reliable new energy,its great advantage has reached a consensus in the international community.Therefore,in the field of new energy development,photovoltaic grid-connected power generation system has become a hotspot in this field.Single-phase photovoltaic grid-connected power generation system technical points include the maximum power point tracking control technology,phase-locked loop technology,island detection technology,DC component suppression and grid-connected inverter control strategy.The main work of this paper includes:1.This paper analyzes several common methods of maximum power point tracking control,analyzes the principle of constant voltage method,perturbation method and conductivity method,and uses MATLAB software to simulate the disturbance method and conductivity method.The DC component of the full bridge circuit is briefly described And the detection methods of active islanding and passive detection are analyzed.The technology of phase-locked loop is analyzed.3.The fourth chapter for the hardware circuit design:the full bridge circuit and hardware sampling circuit for the system design,including hardware circuit,including Boost circuit,sampling protection circuit and drive circuit.2.Hardware circuit design:the full-bridge circuit and hardware sampling circuit for the system design,including hardware circuit,including Boost circuit,sampling protection circuit and drive circuit.3.The advantages and disadvantages of PI and PR control strategies are analyzed,and PI control(voltage feedforward)technology is proposed,and the simulation model is established to simulate and analyze.