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

A technology of three-phase switch and reluctance motor, which is applied in control system, AC motor control, AC power input conversion to DC power output, etc. It can solve the problems of low immunity and reliability, bad environment adaptability, and insufficient excitation voltage. To achieve the effect of speeding up the excitation and demagnetization process, increasing the voltage variation range, and increasing the bus voltage

Active Publication Date: 2021-09-21
HEBEI UNIV OF TECH
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  • Abstract
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  • Application Information

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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

Method used

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

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Embodiment 1

[0079] A 1kW three-phase 12 / 8-pole switched reluctance motor is used as an example for simulation verification. The motor parameters are as follows:

[0080] Table Ⅰ Motor parameters

[0081]

[0082] Among them, the inductance is selected according to formula (6) 2mH inductance, L 1 =L 2 = 2mH. The capacitor is selected according to formula (7) 470uF capacitor, C 1 =C 2 =470uF. Under the load condition of rated speed 3000r / min and rated torque 3N m, the simulation waveform of input power current is as follows: Figure 4 As shown, the input current is about 15A, the current ripple is about 2.3A, and the input power current ripple is about 15.3%, which is less than 20%.

[0083] In the switched reluctance motor drive system of the modular power converter, within a phase current cycle, each phase stator winding has three current operating modes: 1) excitation mode; 2) zero-voltage freewheeling mode; 3) demagnetization model.

[0084] Due to the cascade connection of ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P25/092H02M7/537H02M7/5387
CPCH02P25/092H02M7/537H02M7/53871Y02B70/10
Inventor 孙庆国陈李枚
Owner HEBEI UNIV OF TECH
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