Research On Cascaded Cage Rotor Winding Flywheel Pulse Induction Generator

The flywheel energy storage system can absorb energy from the power grid for a long time and low power,and supply power to the load in a short time and high power.Therefore,it can be used as a power supply device for equipment that require pulse power such as an aircraft electromagnetic ejection system,pulse generator is the core component of this type of flywheel energy storage system.In this paper,a new type of cascaded rotor winding flywheel pulse induction generator(FPIG)is proposed.In this motor,two stators distribute along the axial direction which are control stator and power stator.In the generation state,the reactive power of the motor can be adjusted by controlling the winding,and the voltage of the power winding can be kept stable when the motor speed reduced.In this paper,the mathematical model of the structure motor is established,and its operation characteristics are analyzed.At the same time,the design method of the structure motor is proposed,and the prototype is made and experimentally studied.Firstly,the basic structure of cascaded cage rotor winding FPIG is proposed.The internal physical process of FPIG operation is analyzed.The operating principle of adjusting reactive power winding by adjusting the winding to make the output voltage steady is revealed.The self-inductance leakage inductance of the windings and the mutual inductance leakage inductance between the windings are analyzed.The dynamic mathematical model of the system in the stationary coordinate system and the synchronous rotating coordinate system is established,which establishes a foundation for the analysis and design of the FPIG control system.Secondly,the operating characteristics of cascaded cage rotor winding FPIG are studied.The excitation control strategy is proposed to provide the motor with reactive power required by the control winding and the excitation capacitor.The principle of capacitor construction voltage during motor operation is analyzed,and the factors affecting the output voltage of the system during the excitation of the capacitor are discussed.The influence of excitation capacitance,speed and load on the voltage of the system terminal is discussed.Then,the motor power balance relationship is analyzed by equivalent circuit diagram method.The variation law of reactive power with the speed of each part of the system is analyzed,which lays a foundation for the electromagnetic design of the motor and the design of the excitation control loop.Then,the design characteristics of the cascaded cage rotor FPIG are analyzed,and the principles that should be followed in the design are explored.The design flow and design method of the structure motor are proposed and the electromagnetic design is carried out,including the determination of the basic dimensions.,stator slot design,control winding and power winding design,rotor and flywheel design.Finally,the FPIG excitation control loop of cascade cage rotor winding is given.The optimization method of reducing the control winding capacity by reasonable selection of excitation capacitor value is proposed.The excitation of the system when the control winding capacity is minimum within a certain speed operation range is determined.Capacitance value.The excitation current adjustment unit is designed,that is,the power electronic switching device is used to change the value of the excitation capacitance in real time when the running speed of the motor changes.In addition,finite element simulation and experimental research were carried out to verify the correctness of the working principle and characteristic analysis of the cascaded cage rotor winding FPIG.