Research On The Vector Control System Of An Open-end Winding Synchronous Reluctance Motor

The rotor structure of synchronous reluctance machine(SynRM)is made of special shapes of silicon steel sheet laminated,and the stator structure is the same as the conventional asynchronous motor.It has the advantages of high efficiency,good security with high power density and small hysteresis and eddy current loss.At the same,there is no problem of high-temperature loss because of its internal non-permanent magnet material compared with the non-permanent magnet synchronous motor.Moreover,the torque ripple and noise during motor operation are small,because the rotor surface is smooth and the magnetoresistance changes more continuous.So the SynRM has great potential for development with many advantages.The neutral point of the stator winding of the SynRM is opened to form an open winding structure,and both ends are connected to two inverters,then the open-end winding SynRM drive system based on the dual inverter power supply is constituted.The dual inverter power supply has a multi-level characteristics,and there is no shortcomings of the traditional three-level inverter.Furthermore,the device has the characteristics of natural hardware redundancy,and its fault tolerance is strong,and the modulation strategy is flexible and diverse.Therefore,this paper takes the open-end winding SynRM as the research object.Firstly,the structural characteristics and operating principle of SynRM are analyzed,and the mathematical model of the open winding SynRM in the three-phase still ABC coordinate system and the dq-axis rotating coordinate system is overturned.At the same time,the maximum torque control(MTC)and the maximum power factor control(MPFC)are analyzed in detail.According to the contradictory relationship between power factor and efficiency,the maximum power energies index control strategy is put forward.With this method,the motor's input apparent power achieve the minimum under the condition of the same output power,and the capacity of the inverter and the motor is maximized.Secondly,based on the principle of traditional two-level single-inverter SVPWM and its concrete realization method,the distribution and combination of space vector of dual inverter are analyzed,and the principle and realization of the new technology of dual inverter SVPWM modulation are introduced in detail.In the range of maximum hexagonal modulation,the dual inverter operates at low frequencies within 1800° of each modulation wave period.The operating frequency of the inverter power device is halved,and the loss of the switching device is divided equally,so the life of the dual inverter is effectively improved.At the same time,the simulation is carried out in MATLAB/Simulink simulation environment.The ontology model of open-end winding SynRM is established,and the simulation model of the open winding SynRM vector control frequency conversion system is constructed.The simulation results verify that the new dual inverter SVPWM modulation technology is feasible.Then the maximum torque control,the maximum power factor control and the maximum power energies index control strategy are simulated and analyzed respectively.The simulation results verify the superior performance of the maximum power energies index control strategy.Finally,Through the TMS320F2812 as the core controller,the experimental platform is built,with CCS3.3 platform for software design.The control strategy of the open-end winding SynRM is analyzed to verify the feasibility of the dual inverter SVPWM modulation method.