Design Of Three-phase Photovoltaic Grid-connected Control System Based On DSP

With the continuous development of society,fossil energy has exposed more and more problems in its use,and human demand for green and clean energy is more urgent.Solar energy is a kind of green clean energy,which has inexhaustible characteristics.Photovoltaic power generation uses the photovoltaic effect of photovoltaic cells to convert light energy into electrical energy,and then realizes electric energy conversion and distribution through electrical and electronic equipment.Door technology.The development of modern power electronics technology has laid an important foundation for the application of solar photovoltaic power generation.It is of great practical significance to design a photovoltaic grid-connected system with high integration and stability by using high-performance microprocessor.This paper starts from the application background and current situation of solar photovoltaic power generation,analyzes the development trend of solar photovoltaic power generation,clarifies the research significance of the subject,and then studies the related technologies of photovoltaic grid-connected control system,including the characteristics of photovoltaic cells,Maximum power point tracking,topology of the grid-connected control system,inverter control principle,etc.In the research of grid-connected control,the maximum power point tracking method is determined by comparative analysis,and the phase-locked loop scheme of grid voltage is determined by mathematical model analysis.The maximum power point tracking algorithm and inverter are also simulated by the Simulink tool.The next article is designed from two aspects of hardware and software.The hardware design includes the overall structural design and hardware circuit design of the system.The hardware circuit design mainly includes DSP minimum system,ADC sampling circuit,zero-crossing detection circuit,driving circuit and filtering circuit.The software design includes the main program design and various functional subprograms,including capture interrupt program,MPPT module,ADC sampling program,SVPWM wave modulation program,dead zone time setting and so on.After the hardware system and software system were built,the experimental test and result analysis were carried out in the paper,and the control effect of the system was evaluated.At the end of the thesis,the research and prospects of this topic are summarized and given a reference for future research directions.The three-level photovoltaic grid-connected control system designed in this paper makes full use of the powerful computing power of the digital signal processor to realize the fast processing of the control signal and improve the working efficiency of the control circuit.