Research And Design Of Intelligent Charging Control System For Electric Vehicle Based On Wind And Solar

At present,the research on wind-solar hybrid power generation technology is becoming increasingly extensive,and its application scope is more and more widely.The electric car industry is also developing rapidly.An increasing number of electric vehicle brands are put into the market for the users to drive.The idea of this topic is to combine the two emerging areas,using wind-solar hybrid power generation technology to charge electric vehicles.This approach has opened up a new path for the recycling of new energy resources,which is in line with the current era to promote energy conservation and environmental protection,and it reduce the enormous pressure on the distribution of electricity supply as well.The circuit structure of the charging part of the electric vehicle is designed,and the fast intelligent charging method and the current sharing strategy are mainly studied.For the control of the maximum power point tracking of wind and solar power supply,an improved variable step incremental conductance method is used.The topology of the charging circuit of the electric vehicle is chosen as a bidirectional interleaved DC-DC converter,which is used to realize the fast charging of positive and negative pulse in the high power situation.In view of the fact that the traditional method cannot give the time and the length of the negative pulse,a positive and negative pulse charging method based on fuzzy control is proposed,and the negative pulse is determined by a fuzzy controller.In order to realize 30kW power level,the circuit structure of 4 small charging modules in parallel is adopted to ensure the reliability of the system.The first stage wind and solar complementary output Buck circuit and the post bidirectional interleaving parallel DC-DC circuit forming a charging module.In order to solve the problem of uneven output current caused by the inconsistent parameters of parallel modules,a new current sharing control method based on duty cycle automatic allocation is proposed.This method can redistribute duty cycle of switches automatically to achieve current sharing according to the difference of each module's output current and average current,in the premise of not changing the total current output.It reduces the number of PI links,which facilitates debugging of parameters.Finally,simulation verification experiment of each control link has been done in the MATLAB/Simulink software.It shows that the charging efficiency is higher than the traditional charging method,and the proposed current sharing method can work both in the forward charging and reverse discharge,which meets the national standard.And it provides a new idea for the charging control of the wind-solar hybrid electric vehicle.