Study On Voltage Regulating Method Of Single Phase Micro Grid Based On V2G

With the rapid development of micro grid,electric vehicle taken as a mobile distributed energy storage unit participates in the micro grid energy adjustment,implementation interaction with micro grid is inevitable development trend in the future,the voltage regulating method of single phase micro grid based on vehicle to grid(V2G)is studied in the paper.In order to adjust the fluctuation of micro grid voltage,the single-phase micro grid voltage fluctuation regulation system based on V2G is put forward in this paper.This system has charging energy storage mode and V2G mode.Super capacitor and lead-acid battery are selected to form the hybrid storage system as electric vehicle energy storage system,charging energy storage mode mainly completes the charging process for the vehicle,In V2G mode the super capacitor group is mainly used to stabilize power-type fluctuation and lead-acid is utilized to reduce the energy-type fluctuation.Working principle and control stategy of two modes are analyzed deeply.The system implementation block diagram is designed.The parameters inlcuding power switches and DC-bus capacitor of AC/DC converter and the power switches,energy storage inductor and filter capacitor of the bi-directional DC/DC converter and lead-acid battery and super capacitor part are also designed.And the sampling circuit,signal processing circuit,protection circuit and drive circuit are presented.The software flow chart of system control algorithm is given.Modulation strategy of a single-phase voltage type PWM rectifier circuit is analyzed in detail when the AC/DC converter works in rectifier mode.Based on the comparative analysis of the circuit working principle and advantages and disadvantages of unipolar modulation and bipolar modulation,a hybrid modulation method of unipolar modulation and bipolar modulation combined is proposed.Simulation and experimental results prove that,using the hybrid modulation methed,can solve zero-crossing distortion problem for the unipolar modulation,improve the sinusoidal current,and may solve the large switching loss problem of bipolar modulation.Simulation model of the system is built in the MATLAB/Simulink simulation software.Control strategy of the charge storage mode and the V2G mode are verified.An experimental platform based on the Infineon XE164FN MCU is installed,the control algorithm is compiled.The charging energy storage mode and V2G mode control algorithms are studied by experiment.The correctness and feasibility of the proposed voltage regulating method of single phase micro grid are verified by simulation and experimental results.