Research And Design On One-Phase Photovoltaic Inverter

As human development, energy shortages and imminent ecological crisis andother issues in urgent need of people to solve, humans are constantly looking for newalternative energy sources. Among them, solar energy is applied by a large number ofmajor conventional alternative energy, and photovoltaic power generation technologyis the major trends in the use of solar energy, will be developed rapidly. Therefore,this article on the grid-connected PV system has been described in detail, and thesystem control algorithm, system simulation, hardware and software design and otheraspects of the in-depth study.This paper details the photovoltaic power generation system structure andworking principle, the system performance requirements, determine the appropriategrid-system topology.Second, the PV inverter system control strategy in-depth study. PV invertersystem based on control objectives, analysis of the inverter control method used andthe DDS principle, on this basis to determine the SPWM control mode as the system’scontrol.This also works on the photovoltaic cells are described, to get the equivalentcircuit of photovoltaic cells and output characteristics. Through the common controlof the maximum power point tracking (MPPT) algorithm analysis and comparison,the paper introduces the constant voltage method with variable step size of theincremental conductance method to achieve the photovoltaic power generation system,the maximum power point tracking. In this paper, DDS technology to achievegrid-connected PV system frequency, phase tracking and the maximum power pointtracking.Finally, this paper TMS320F2812high-speed digital signal processor as the coreprocessor, the photovoltaic inverter hardware and software design of a study on thephotovoltaic inverter topology, the digital control circuit, the AC filter parametersgives a detailed design features and methods of calculation. In this paper,grid-connected PV systems for simulation, the simulation results and gives a detaileddescription. The hardware platform on an experiment to test the correctness of systemsimulation. Finally, this paper summarizes the work, pointing out the shortcomings ofthe system, for future research were discussed.