Research On Grid Connected Control Of Micro-inverter Based On FPGA And Neural Network Inverse Control

A large number of toxic pollutants produced by the production and consumption of fossil energy are seriously increasing the air pollution.As a kind of renewable energy,clean and non-polluting solar energy has attracted wide attention from all over the world.Photovoltaic power generation is one of the most common forms to utilize solar power.As one of important parts of the photovoltaic power generation system,the design and control of t he micro inverter directly affect the efficiency of the photovoltaic power generation system and the quality of the grid connected.In this paper,the advanced neural network inverse control method is applied to the control of micro inverter.The simulatio n results show that the neural network inverse control can improve the quality of the grid connected of micro inverter.And the application of neural network inverse control to the actual micro inverter is tested.Firstly,this paper describes the classification of micro-inverters.According to the advantages and disadvantages of DC/DC converter and DC/AC circuits and the important factors in the design of micro inverters,high-frequency current-chain micro-inverter topology is applied.Some common method a bout micro inverter control is described,and neural network inverse control is proposed for research on micro-grid-connected inverters.Secondly,according to micro-inverter topology,it shows that micro inverter system is reversible system by modeling.On this basis,simulation model of micro inverter is established by Matlab.A neural network inverse model is established,and simulation about micro inverter system under the control of this model is carried out on various conditions,the result shows that it can improve the quality of grid connected of micro inverter.Finally,an experiment platform for micro inverter based on FPGA and neural network inverse control is designed.Design of hardware circuit and software about experiment platform and communication protocol between micro control and FPGA are described in detail.Based on experiment platform,experiments about grid connection are carried out and the experimental results are recorded.