Control Photovoltaic Battery Charge And Discharge Control Circuitry

This article is mainly to study the battery charge and discharge control technology,and then extend the life of the battery,and the battery charge and discharge technology is generally combined with photovoltaic power generation and integrated control of the grid,the current use of grid connection technology is the maximum power tracking control,the current combination the battery charging and discharging technology of the maximum power tracking control is widely used.But the maximum power tracking control method of grid connection will reduce the inertia of the system and reduce the ability of the system to resist risks.The virtual synchronous generator grid-connected mode mainly simulates the characteristics of synchronous motor and converts it into relevant control strategies.This grid-connected mode can effectively improve the stability of the system.Therefore,in this paper,the virtual synchronous generator grid-connected mode and battery charge-discharge control technology are combined to study the battery charge-discharge technology,and the stability of the system can be improved on the basis of improving the service life of the battery.The specific research content is:(1)Select the battery and establish the corresponding model.Firstly,the specific structure of the traditional photovoltaic power generation system is introduced,and the role of the battery in the photovoltaic power generation system is analyzed.Based on this,the battery is selected,and finally a corresponding model is established according to the selected battery,(2)The basic principle of virtual synchronous generator is studied.Firstly,the basic structure of the virtual synchronous generator is analyzed,and on this basis,the characteristics of the synchronous generator are transformed into relevant control algorithms.Then,based on the characteristics of the synchronous motor,the virtual power frequency controller and excitation voltage controller of the virtual synchronous generator are designed to optimize the process of system grid-connection.(3)Combined with the virtual synchronous generator grid-connected control algorithm,the charging and discharging control method of the battery is designed.Firstly,the SOC in the battery is divided into regions,and different control functions of variable sag coefficient are determined for different regions,and the sag coefficient is used for grid-connected control,so as to restrain the deep discharge and excessive charging of the battery.Finally,corresponding simulation is built to verify the algorithm designed in this paper.(4)Hardware and software design for the battery charge and discharge technology designed in this paper.Finally,the effectiveness of the control algorithm designed in this paper is verified by the experimental results.