Three-level motor power converter achieving quick demagnetization

Abstract

The invention discloses a three-level motor power converter achieving quick demagnetization, and the converter comprises an upper DC power supply, a lower DC power supply, a three-phase winding, an upper three-phase power device, a low three-phase power device, a filtering capacitor, an energy storage capacitor, and six freewheel diodes. Compared with the topological structure of a conventional three-phase switching magnetic resistance motor power converter, the converter is additionally provided with the upper DC power supply, adjusts the voltage of the upper DC power supply to be greater than the exciting voltage of the lower DC power supply thorough a voltage adjuster, enables the decrease speed of a phase current at a follow current stage to be increased, increases the discharge speed of a phase winding, prolongs the time when the current of the phase winding maintains the maximum effective value while eliminating a braking torque, increases the output power of a system, and reduces the torque ripple.

Description

technical field [0001] The invention relates to the technical field of drive control of a switched reluctance motor and the design of a power converter, in particular to a three-level power converter powered by a dual power supply. Background technique [0002] The switched reluctance motor speed control system is a mechatronics product based on modern power electronics and microcomputer control technology. features. Due to the excellent control performance of the switched reluctance motor speed control system, by changing the working mode of the switched reluctance motor and controlling various parameters, it is easy to achieve many different performance characteristics required by the site and meet some special working performance indicators. With its unique advantages, the speed control system of switched reluctance motor gradually occupies a place in the field of electric transmission, and its good development prospects make it one of the hottest topics in the field of ...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the traditional switched reluctance motor power converter cannot be adjusted separately due to the same voltage values ​​in the excitation and freewheeling phases in the asymmetrical half-bridge power converter, which prolongs the effect of the braking torque time, which greatly affects the effect of the system output torque, and cannot reach the rated power of the motor

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