Switched reluctance motor four-level power circuit

Abstract

The present invention discloses a switched reluctance motor four-level power circuit. A multi-phase independent boosted circuit portion is added on the basis of a traditional asymmetric power conversion circuit, the switched reluctance motor four-level power circuit comprises a public boost capacitor C2, switch tubes VTA1, VTB2 and VTC1, and diodes VDA1, VDB2 and VDC1. Through control of the switching of switch tubes in the power topology, each phase winding of a switch reluctance motor can be independently switched and operated in the four states of high speed excitation (+2), high speed demagnetization (-2), normal excitation (+1) and zero-pressure follow current (0) and can be not mutually disturbed. The independent switch of the four levels of each phase of switched reluctance motors is realized to make the overlapping operation (a conduction angle is larger than 120 degrees) of four-level power circuit work in each phase possible. A common capacitor replaces an independent capacitor of each-phase boosted circuit to effectively reduce the size of the power circuit, and the switched reluctance motor four-level power circuit has a high-robustness, high-reliability and compact structure, and has a large application prospect.

Description

technical field [0001] The invention relates to a power conversion circuit of a motor, in particular to a four-level power circuit of a switched reluctance motor. Background technique [0002] The switched reluctance motor has the advantages of high reliability, large starting torque, and low manufacturing cost. Its power circuit has always been a hot spot of research by experts from various countries. A suitable power circuit can reduce the cost of the switched reluctance motor and improve the performance of the switched reluctance motor. Dynamic characteristics broaden the application occasions of switched reluctance motors. Based on the most commonly used asymmetrical half-bridge power conversion circuit, the four-level circuit proposed in the document "Instantaneous Torque Control of Switched Reluctance Motor Based on Four-level Power Conversion Circuit" cannot independently provide different power for each phase of the motor. Level, the boost circuit common to each pha...

AI Technical Summary

Problems solved by technology

[0003] The problem to be solved by the present invention is to improve the deficiencies in the existing four-level power circuit, and propose a new four-level power circuit of switched reluctance motor with independence in each phase, by controlling the conduction and Turn off, so that the level of each phase of the switched reluctance motor can be switched independently at any time, and solve the problem that the four-level power circuit cannot work effectively when the motor is in overlapping operation

Images