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Fault-tolerant control system and method for two-unit same-phase permanent magnet synchronous motor

A permanent magnet synchronous motor, fault-tolerant control technology, applied in control systems, motor control, vector control systems, etc.

Active Publication Date: 2020-10-02
东南大学深圳研究院
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is only suitable for single-phase open circuit, and it is powerless for the situation of two-phase open circuit

Method used

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  • Fault-tolerant control system and method for two-unit same-phase permanent magnet synchronous motor
  • Fault-tolerant control system and method for two-unit same-phase permanent magnet synchronous motor
  • Fault-tolerant control system and method for two-unit same-phase permanent magnet synchronous motor

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Embodiment Construction

[0053] The "two units in the same phase" mentioned in this article means that there is no phase difference between the two unit motors;

[0054] The "different phases" in the "two-phase (located in different phases) open-circuit fault" described in this article refers to that the phases where the two unit motors fail are different;

[0055] A fault-tolerant control system and method for a two-unit same-phase permanent magnet synchronous motor proposed by the present invention, except for the A phase of the unit motor 1 and the A phase of the unit motor 2, the B phase of the unit motor 1 and the B phase of the unit motor 2; Two-phase open circuit faults other than the three two-phase fault cases of motor 1 phase C and unit motor 2 phase C are applicable.

[0056] refer to figure 1 , a two-unit same-phase permanent magnet synchronous motor fault-tolerant control system proposed by the present invention, including: current sensor, encoder, speed PI controller, quadrature axis cu...

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Abstract

The invention provides a fault-tolerant control method for a two-unit same-phase permanent magnet synchronous motor, and the method comprises the steps of obtaining a quadrature-axis current referencevalue through combining with the rotating speed of a motor, and distributing the quadrature-axis current reference value and a preset direct-axis current reference value to two unit motors; combiningthe quadrature-axis reference current, the direct-axis reference current, the quadrature-axis actual current and the direct-axis actual current of each unit motor to obtain the quadrature-axis voltage and direct-axis voltage of each unit motor, and performing coordinate transformation to obtain the two-phase static voltage of each unit motor; obtaining a voltage vector combination of each sectorof each unit motor and calculating the corresponding action time; and screening an optimal voltage vector combination according to a preset screening function. According to the method, the independentdecoupling control over the two units can be achieved after the two-unit same-phase permanent magnet synchronous motor driving system has a two-phase open-circuit fault, the switching frequency in each sampling period is kept constant, it is guaranteed that better operation performance is still achieved after the open-circuit fault occurs, and the fault operation capacity of the system is improved.

Description

technical field [0001] The invention relates to the technical field of fault-tolerant control of permanent magnet synchronous motors, in particular to a fault-tolerant control system and method for a two-unit same-phase permanent magnet synchronous motor. 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 number of phases of the stator winding increases, which reduces the transmission power of each phase, thereby reducing the capacity of power devices, and avoiding the power device string, Problems such as voltage equalization and current equalization caused by parallel connection; 2) The fault-tolerant operation capability of the system is improved, and fault-tolerant operation under fault conditions can be realized. However, the increase in the number of phases will lead to complex control algorithms, while the same-phase and multi-unit motors have the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P29/028H02P29/024H02P25/022H02P21/00
CPCH02P29/028H02P29/0243H02P25/022H02P21/0003H02P2207/05
Inventor 花为李昊洋章恒亮程明
Owner 东南大学深圳研究院
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