Research On The Topology And Control Strategy Of An Integrated Dual Output Three-phase PWM Rectifier

With the increasing application of electric vehicles,electric vehicle charging technology has become an important research direction.In this paper,the traditional AC-DC rectifier and DC-DC converter are studied,and a novel integrated three-phase PWM rectifier is proposed.By adding only one switch to the traditional three-phase PWM rectifier,it can realize the integration of three-phase PWM rectifier and the bidirectional DC-DC converter.Compared with the cascade of traditional DC-DC converters and AC-DC rectifiers,the novel rectifier reduces a switch,which can further reduce the size and cost of the electric vehicles charging systems.It provides certain theoretical and practical value for the design and research of electric vehicles charging systems.The topology and control method of traditional DC-DC converter and AC-DC converter in vehicle charger are studied in this paper systematically.On this basis,a novel integrated three-phase PWM rectifier suiting for vehicle charging is proposed.The corresponding integrated control strategy is also studied systematically.The specific research content is as follows.Firstly,the dual-output DC-DC converter using two buck/boost DC-DC converters connected in parallel has such problems as complex topology,large volume and high cost.In order to solve the problems above,a dual-output three-switch cascade DC-DC converter is researched.It can realize the cascade of buck/boost DC-DC converter with reducing one switch.The integrated control strategy is also studied systematically.The theoretical feasibility of this topology is analyzed through simulation.Secondly,the single-phase PWM rectifier and the three-phase PWM rectifier are studied respectively for single-phase and three-phase charging applications.The single-phase PWM rectifier using triangle wave comparing current is studied,and simulation and experiment are also used to verify its feasibility.The three-phase PWM rectifier basing on SVPWM modulation method and voltage and current double closed-loop control mode is also researched.A calculation method based on coordinate transformation is proposed,which realizes the fast tracking of the phase of the A-phase fundamental wave voltage,and the simplification of the phase lock algorithm.The vector synthesis method of space vector pulse width modulation(SVPWM)is also analyzed.The simulation and experiment are also used to verify its feasibility.Thirdly,basing on the research on three-switch cascade DC-DC converter and three-phase PWM rectifier,a novel integrated three-phase PWM rectifier is proposed,and the operating principle and control method are studied systematically.By analyzing the relationship between the input and output voltage of the integrated topology,the voltage parameters of the input and output of the integrated topology are designed.The control strategy of the integrated three-phase PWM rectifier is designed,combining the control of the three-switch cascade DC-DC converter and three-phase PWM rectifier.The integrated topology is analyzed in principle feasibility by simulation.An experimental platform based on TMS320F28335 controller and integrated three-phase PWM rectifier is built.Using this integrated rectifier,the charging experiment of lead-acid batteries for electric vehicles was completed,for both single-phase and three-phase applications.The practicality of the integrated rectifier as a vehicle charger was verified at last.