The Research On V2G Charging Station Using The High Frequency Link Matrix Converter

V2G technology using electric vehicle as a kind of energy storage unit can provide some services for the grid and be used as a buffer unit for renewable energy,meanwhile benifit the users.The realization of V2G mostly relay on car-park for the establishment of V2G charging station.The integration,space occupancy rate and reliability of V2G charging station will affect its construction costs and utilization.It's necessary to do the research on high-performance control strategy.Firstly,the paper introduces the background and significance of the topic while elaborating the concept of V2G technology and the related research.Describe the topoplogy of V2G charging station and put foward the control strategy of upper power allocation and lower power control.Secondly,a new design scheme of V2G charging station with High-Frequency Link Matrix Converter is proposed in this paper.Analysis of the working principle and establishment of its mathematical model both provide support for the follow-up work.Because the modulation difficult of High-Frequency Link Matrix Converter,a variety of modulation strategies have been studied with the resault of choosing the B-C-SVM.Thirdly,put foward the lower power control strategy of V2G charging station using the High-Frequency Link Matrix Converter.PI control and predicteve current control make up the double closed-loop power conrtol.The lower power control strategy can make the charging unit keep power stability which originating from the upper power allocation and the current follow the command.Due to the High-Frequency Link Matrix Converter is a current topology,the network side filter is easy to resonate.So,the control method has a improvement based on improved active damping,which can reduce the resonance peak at the same time bring no influence on the high frequency filtering ability and improve the stability of the system.Finally,take a research on the upper power allocation strategy for the High-Frequency Link Matrix Converter V2G charging station which can provide the service like peak clipping and valley filling,and ensure the user's income.Based on the known load and the real-time monitoring of electric vehicle,adopt particle optimization algorithm to allocate the power of each charging unit and then transport to the lower power control srtategy.The user's travel plan and personalized settings have been taken into account,such as the battery off time and minimum capacity when leave the station.In order to solve the problem of unbalanced power of each charging unit,a new method to improve the objective function is proposed,which can effectively avoid the waste of energy and the extra loss of battery.The Matlab/Simulink simulation platform has been established to verify the feasibility and rationality of the proposed theory.