Research On V2G Bidirectional Full-Bridge CLLC Resonant DC/DC Converter

With the development and progress of the society,energy and environmental problems need to be solved urgently.As private cars are becoming more and more the tools for people to travel,and fuel cars have serious environmental pollution and energy consumption,the rise of new energy electric vehicles has attracted global attention.With the rapid development of electric vehicles and the sharp increase in the number of electric vehicles,V2 G technology is proposed.The integration of electric vehicles into the power grid will not have negative effects on the traditional power grid.In this way,electric vehicles can be used as distributed energy storage equipment to participate in the regulation of the power grid.In V2 G,the process of vehicle network energy interaction is the core of its research.The focus of this paper is the DC/DC converter in vehicle network interaction,and the bidirectional full bridge CLLC isolated DC/DC converter is the main content of this paper.Through to the isolated type and the bi-directional DC/DC converter after the study of the basic topology to understand its basic working principle of the traditional dual active bridge(dual active bridge,DAB)study of the coma after joining RDC now even though the DAB reactive circulation is eliminated,but the output voltage and current harmonics,such as instability,at the same time,through to the LLC two-way resonant converter with CLLC compares the advantages and disadvantages of resonant converter and proves the CLLC two-way resonant converter due to its the adjusting range is extensive applied to high power equipment,On this basis,a new bidirectional full bridge CLLC resonant DC/DC converter is designed to improve it.The principle of CLLC resonant converter is analyzed by fundamental wave analysis method.The advantages and disadvantages of inverter control,phase shift control and hybrid control converter are compared.Finally,the hybrid control method of CLLC is determined.Aiming at the control design of CLLC bidirectional full-bridge resonant DC/DC converter,the PID double closed-loop control of CLLC bidirectional resonant converter is studied,and the disadvantages of the traditional PID controller such as the inflexibility of parameter setting,poor accuracy and the sudden change of the output voltage and current of the PID control when it is disturbed by the outside world are also discussed.A HSPID(Harmony Search PID Algorithm)controller is designed.Through the output voltage and current waveform in the simulation circuit,it can be found that HSPID can automatically set PID parameters,and has strong anti-interference ability,which overcomes the shortcomings of the traditional PID.