Research On Modeling And Control Methods Of Cup Rotor Permanent Magnet Doubly Fed Machine

The cup rotor permanent magnet doubly fed machine is composed of a rotating permanent magnet stator,a wound stator and a cup rotor.This new machine eliminates brushes and slip rings,enhancing system maintainability and reliability.The cup rotor permanent magnet doubly fed machine can be used in hybrid electric vehicles.The rotating permanent magnet stator connects to the output shaft of the internal combustion engine,and the wound stator connects to the inverter.When the cup rotor speed is constant,this machine can optimize the working point of the internal combustion engine by adjusting the power supply frequency of the winding stator,and realize the function of speed coupler.This machine has a broad application prospect in the field of AC speed regulation.In this thesis,the modeling,static load capacity,open-loop stability and control methods of the cup rotor permanent magnet doubly fed machine are studied.The contents are as follows.Firstly,the operation principle of the cup rotor permanent magnet doubly fed machine is analyzed,and the mathematical model of this machine in the rotor reference frame is deduced.The state space model of this machine in the unified synchronous reference frame is established by negative conjugate transformation of some variables of the power machine.Considering that the control machine of this machine usually has a current loop with fast response in practice,a state space model with the stator current of the control machine as the input variable is established by redefining the rotor flux of the control machine.Secondly,according to the above model,the static model of the cup rotor permanent magnet doubly fed machine is obtained,the upper and lower bounds of the static load torque of this machine are solved,and the influences of the machine parameters,flux and speed on the static load capacity of this machine are analyzed.On the basis of the static solutions,a small signal model is established to solve the stable operation interval of the cup rotor permanent magnet doubly fed machine under the open loop control of constant voltage frequency ratio,and the influences of the rotational inertia and voltage frequency ratio on the open loop stable operation interval are analyzed.In addition,the correctness of the above theoretical solutions is verified by simulation.Finally,based on the input-output feedback linearization theory,the feedback linearization control method of the cup rotor permanent magnet doubly fed machine is designed,and its slip realization scheme is given.The premise of the feedback linearization realization is explained,and the zero dynamic of the system after the feedback linearization is analyzed.The maximum torque per ampere control method of this machine is further deduced.The control system is designed with the speed and maximum torque per ampere control as the outer loop and the feedback linearization control as the inner loop.Through simulation and comparative analysis,the decoupling performance and dynamic performance of feedback linearization control,the effectiveness of maximum torque per ampere control,and the robustness of the two control methods to parameter deviation are verified.