Research On Key Technologies Of Photovoltaic Grid-Connected Converter

With the increasing depletion of fossil fuels and the growing problem of environmental pollution,people pay more and more attention on the use of new energy sources.Solar,with its many advantages,come out ahead in the development and utilization of new energy.There are several ways to apply the solar energy.Solar power has become a major application.In this paper,a dual-stage grid-connected PV system has been introduced.The system used the Boost circuit and the PWM rectifiers to incorporate into the network with unity power factor.Article focuses on the key technologies of the system, including the design and control of Boost circuit,design and control of PWM rectifier, maximum power point tracking technology,as well as the anti-island.PWM rectifier used SVPWM control algorithm to achieve the sinusoidal current control of the network side.Maximum power point tracking method introduced the constant voltage method, climbing method,incremental method,such as admittance.Island is divided into passive detection technology and active detection technology.The main is active.These control algorithms are based on TMS320F2812 DSP,using C language programming to realize.Finally,the feasibility of the design has been proved though experiment.