LOE (loss of excitation) fault tolerance prediction control method and device for permanent magnet synchronous motor

A permanent magnet synchronous motor, predictive control technology, applied in the direction of motor control, motor generator control, AC motor control, etc., can solve the problems affecting the performance of the control system, inconsistency, and large environmental differences

Active Publication Date: 2017-12-15
湖南中聚福能源科技有限公司
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Problems solved by technology

However, in engineering practice, the operating conditions of permanent magnet synchronous motors are complex, and the environment varies greatly. With the increase of service life, the permanent magnets of the rotor are subject to electromagnetic, thermal, mechanical and other stresses, which will cause demagnetization failures.
The loss of exc

Method used

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  • LOE (loss of excitation) fault tolerance prediction control method and device for permanent magnet synchronous motor
  • LOE (loss of excitation) fault tolerance prediction control method and device for permanent magnet synchronous motor
  • LOE (loss of excitation) fault tolerance prediction control method and device for permanent magnet synchronous motor

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Embodiment Construction

[0088] Such as figure 1 and figure 2 As shown, the implementation steps of this embodiment for the loss-of-excitation fault fault-tolerant predictive control method for permanent magnet synchronous motors include:

[0089] 1) Obtain the speed ω and d-axis voltage u of the permanent magnet synchronous motor d , q-axis voltage u q , d-axis current i d and the q-axis current i q ;

[0090] 2) Design a sliding mode observer for the demagnetization torque detection, the q-axis current i q Input the demagnetization torque detection sliding mode observer with the rotational speed ω to get the demagnetization disturbance estimation value and speed observations

[0091] 3) According to the reference speed ω ref , The estimated value of the loss of field disturbance is obtained in the sliding mode observer of the loss of field torque detection and speed observations Perform fault-tolerant predictive speed control to calculate q-axis command current

[0092] 4) Design ...

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Abstract

The invention discloses an LOE (loss of excitation) fault tolerance prediction control method and device for a permanent magnet synchronous motor, and the method comprises the steps: obtaining the rotating speed, voltage and current of the permanent magnet synchronous motor, designing an LOE torque detection sliding-mode observer, obtaining an LOE disturbance estimation value and the observation value of the rotating speed, carrying out the fault tolerance prediction and rotating speed control to calculate a q-axis instruction current, designing an LOE flux linkage detection sliding-mode observer, obtaining a current observation value and a state current observation value after the LOE of a permanent magnet, carrying out the fault tolerance prediction and rotating speed control to calculate an instruction voltage, carrying out the inverse Park transformation and modulation through an SVPWM module, and generating a PWM pulse signal. The device comprises program units corresponding to the steps. The method achieves the quick and no-static-error tracking of the rotating speed and current of the permanent magnet synchronous motor under the LOE condition of the permanent magnet, optimizes the control performances of a rotating speed ring and a current ring, and facilitates the application of the permanent magnet synchronous motor in a severe environment and occasions with higher requirements for reliability.

Description

technical field [0001] The invention relates to the control technology of a permanent magnet synchronous motor, in particular to a method and device for a fault-tolerant prediction control method and device for a loss-of-excitation fault of a permanent magnet synchronous motor. Background technique [0002] In recent years, direct-drive wind power generation systems with brushless permanent magnet synchronous motors have been more and more widely used. People have also put forward higher requirements on the control performance of permanent magnet synchronous motors. Vector control is the most commonly used method for high-performance control of AC motors, and the control of the speed loop and current loop is the key. The traditional speed loop and current loop controllers are PI controllers, which are widely used in permanent magnet AC motor drives due to their simplicity and robustness. However, the permanent magnet synchronous motor is a multivariable, strongly coupled n...

Claims

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Application Information

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IPC IPC(8): H02P21/13H02P21/22H02P21/06H02P25/026H02P27/08
CPCH02P21/0007H02P21/06H02P21/13H02P21/22H02P25/03H02P27/08H02P2205/01H02P2209/11
Inventor 黄守道吴公平高剑罗德荣李慧敏
Owner 湖南中聚福能源科技有限公司
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