Study on Effect of AC Excitation Pulse Voltage Duty Cycle on Discharge Characteristics of Rotor Windings of Doubly-fed Variable Speed Pumped Storage Motor
Doubly-fed variable-speed pumped storage motor is a very important part of the new power sys-tem,which is powered by AC excitation and low-frequency PWM pulse voltage,in which the duty cycle,as an important parameter of the PWM technology,has a certain impact on the insulation of the motor,and the study of the square-wave duty cycle impact on the discharge characteristics of the rotor winding of the varia-ble-speed pumped storage motor is conducive to the evaluation of the insulation of the variable-speed pumped storage unit.Taking a variable-speed pumped storage unit as the research object,a finite element model of the rotor winding was established,and the electric field potential characteristics of the rotor winding insula-tion weak area under different square wave duty cycles were simulated and analyzed based on the COMSOL finite element simulation platform,and a 3 kV rotor winding partial discharge test platform was set up to ana-lyze the partial discharge characteristics of the rotor winding under the action of square wave voltages with different duty cycles.
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