Three-phase switched reluctance motor system based on quasi-Z-source modular converter

Abstract

The invention relates to a three-phase switched reluctance motor system based on a quasi-Z-source modular converter. A quasi-Z-source modular converter of the system is composed of a front-end quasi-Z-source circuit and four groups of power conversion units connected in parallel, and a phase stator winding of a three-phase switched reluctance motor is connected among the four groups of power conversion units; the converter can realize four operation modes, namely a direct-through mode, a non-direct-through excitation mode, a non-direct-through zero-voltage follow current mode and a non-direct-through demagnetization mode. The bus voltage can be adjusted by changing the direct-through duty ratio of the quasi-Z-source modular converter, the change range of the DC bus voltage is greatly expanded, and thus the wide-range speed regulation of the motor can be realized. And meanwhile, the bus voltage is increased, so that the excitation and demagnetization processes can be accelerated, and the torque pulsation is reduced. The three-phase switched reluctance motor system is high in integration level, high in power density, high in reliability and adjustable in DC bus voltage.

Description

technical field [0001] The invention belongs to the technical field of motors, and in particular relates to a three-phase switched reluctance motor system based on a quasi-Z source modular converter. Background technique [0002] As the source of power in the global industrial automation field, the increasing market size of the motor drive system supply and demand, as well as the increasingly complex application environment and operating conditions, will impose stricter requirements on the cost, environmental adaptability and operational reliability of the motor drive system. Technical standards and higher technical requirements. Under the background of global acceleration of industrial automation and advocacy of green and intelligent manufacturing, rare-earth-free switched reluctance motors have become domestic and foreign due to their outstanding advantages such as low motor cost, strong adaptability to harsh environments, good fault tolerance, and strong sustainability of...

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Problems solved by technology

[0005] The purpose of the present invention is to inherit and strengthen the inherent advantages of the switched reluctance motor such as wide speed regulation and good adaptability to harsh environments, and solve the problem of insufficient excitation voltage, low immunity and low reliability in the existing research on the modular drive system of the switched reluctance motor To make up for and improve the poor matching between Z-source / quasi-Z-source network and switched reluctance motor and low system integration, a three-phase switched reluctance motor system based on quasi-Z-source modular converter is proposed

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