Research On Driving Charging Integrated Control Strategy Based On Motor Inductance Equivalent Technology

According to statistics,the use of fuel vehicles is one of the main factors that pollute the environment and energy consumption.With the worsening of the environment and the shortage of energy,the exhaust emission is zero pollution,and the electric vehicles can be driven only by electric energy.In recent years,the government's support for the electric vehicle industry has made the electric vehicle industry and related technology develop rapidly.In the early stage of electric vehicle development,electric vehicles need to charge and drive two independent devices,and two sets of devices contain large capacitors and large inductors.The electric vehicle manufactured by this way has high cost.The controller occupies large space inside the vehicle,heavy body,loss of reactive power and short mileage.To solve the above problems,this paper designs an integrated topology of driving and charging,which integrates electric vehicle driving system and charging system into a set of systems.The topology not only realizes a common device for driving and charging,but also the large inductance of rectifier / inverter module is replaced by motor windings.The electric vehicle manufactured by this way solves the problems of the above electric vehicles,and plays a positive role in the popularization of electric vehicles.In this paper,the current driving charge integration method is introduced.Secondly,the integrated topology of this paper is introduced,and the integrated topology is analyzed.At last,the equivalent topology structure of the two modes of driving and charging,each module and the working principle are analyzed.The three-phase converter module(PFC transform module)with power factor correction ability in the equivalent charging topology is analyzed.First,the influence of leakage inductance,excitation inductance and zero sequence inductor on the charging process is analyzed by mathematical modeling of PFC converter module.Secondly,through the analysis of the current common mode and differential mode component expression in the motor winding,the PFC converter is analyzed.The anisotropy of the motor has no effect on the dynamic characteristics of the charging system.Then the article introduces the principle of phase current balancing and the corresponding strategy to keep the permanent magnet synchronous motor in charge of the rotor when it is charged.Finally,the working modes of the charging system are detailed in detail.Analysis?Firstly,the integrated topology drive mode vector control strategy and charging mode voltage outer loop current inner loop double closed loop control mode are analyzed.Secondly,the driving mode vector control strategy and the charging mode voltage outer loop current inner loop double closed loop control mode are simulated by Simulink.Through modeling and Simulation of the driving mode,the electromagnetic torque,speed and stator current waveform of the integrated device working in the driving mode are obtained.By modeling and Simulation of the charging mode,the input voltage and current waveform and the bus voltage and current waveform in the charging system are obtained.Finally,the waveform is compared and analyzed,and the integrated topology and the corresponding control are obtained.The strategy is reasonable.At the end of the paper,the platform of the integrated system is built,and the working mode and charging mode of the integrated device are verified experimentally.The waveform of the motor speed,torque and the input current under the working state of the motor and the output voltage of the DC bus are compared with the simulation results.The waveform is basically consistent,thus verifying that the waveform is consistent.The rationality of the integrated topology and control strategy is also discussed.