System and method for fault-tolerant control under five-phase permanent magnet synchronous motor open-circuit faults

A technology for permanent magnet synchronous motors and open circuit faults, applied in control systems, motor control, vector control systems, etc., can solve problems such as less research on model predictive control

Pending Publication Date: 2018-01-09
SOUTHEAST UNIV
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  • Abstract
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Problems solved by technology

The model predictive control method disclosed in the above patents can improve the performance of the five-phase permanent magnet synchronous motor drive system during normal operation, but there are few studies on the model predictive control of the five-phase permanent magnet synchronous motor drive system under fault conditions

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  • System and method for fault-tolerant control under five-phase permanent magnet synchronous motor open-circuit faults
  • System and method for fault-tolerant control under five-phase permanent magnet synchronous motor open-circuit faults
  • System and method for fault-tolerant control under five-phase permanent magnet synchronous motor open-circuit faults

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Embodiment Construction

[0045] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0046] Such as figure 1 As shown, a fault-tolerant control system for five-phase permanent magnet synchronous motor under open-circuit fault, including speed PI controller 1, current reconstruction module 2, value function optimization module 3, duty cycle control module 4, inverter 5, Current sensor 6, five-phase permanent magnet synchronous motor 7 with single-phase open-circuit fault, encoder 8, basic voltage vector action time calculation module 9 and current prediction module 10;

[0047] The speed reference value is compared with the actual speed fed back by the encoder 8, and the speed difference is input to the speed PI controller 1; the speed PI controller 1 outputs the fundamental space quadrature axis current reference value, and inputs it to the current reconstruction module 2. The reconstructed phase current is expanded to obtain ...

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Abstract

The present invention discloses a system and method for fault-tolerant control under five-phase permanent magnet synchronous motor open-circuit faults. The method comprises: employing a rotation speedcontroller to obtain a fundamental wave space quadrature-axis current reference value; based on a magneto-motive force invariant principle, performing reconfiguration of phase current after generation of faults, and obtaining a fundamental wave space two-phase static current reference value through the developed Clark conversion; employing the collected phase current and a rotor position angle tocalculate a no-voltage voltage vector effect time; employing the two-phase static current reference value and a preset value to establish a value function; and finally, obtaining an optimal voltage vector and an effect time thereof through optimization of the value function, employing duty ratio control to design a duty ratio and convey to duty ratio to an inverter, and outputting an optimal voltage through the inverter to a permanent magnet synchronous motor operated with faults. The system and method for fault-tolerant control under five-phase permanent magnet synchronous motor open-circuitfaults simplify a voltage vector set after five-phase permanent magnet synchronous motor open-circuit faults are generated and reduce calculation amount; a method through combination of a no-zero vector and a zero vector is utilized to improve model prediction and control stable state performances.

Description

technical field [0001] The invention relates to a fault-tolerant control system and method for a five-phase permanent magnet synchronous motor under a single-phase open-circuit fault, belonging to the field of motor drive and control. Background technique [0002] Compared with the traditional three-phase AC speed control system, the multi-phase AC speed control system has the following advantages: 1) The frequency of the electromagnetic torque ripple is increased, and the amplitude of the torque ripple is reduced; 2) The phase number of the stator winding is increased, and the The capacity of power devices is improved, and problems such as voltage equalization and current equalization caused by series and parallel connections of power devices are avoided; 3) The fault-tolerant operation capability of the system is improved, and non-disturbance fault-tolerant operation can be realized under fault conditions. In addition, compared with asynchronous motors, permanent magnet sy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14H02P21/22H02P25/026H02P27/06H02P29/028
CPCH02P27/06H02P21/14H02P21/22H02P25/03H02P29/032
Inventor 花为黄文涛陈富扬殷芳博丁石川
Owner SOUTHEAST UNIV
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