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Disturbance suppression method for permanent magnet synchronous motor in flux weakening control mode

A permanent magnet synchronous motor, field weakening control technology, applied in motor control, motor generator control, AC motor control and other directions, can solve system disturbance, voltage disturbance, predictive control output deviation from the reference value and other problems

Active Publication Date: 2021-02-26
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0004] In order to solve the problem of system disturbance caused by parameter mismatch in the existing permanent magnet synchronous motor under the field-weakening control mode, and especially for the change of inductance, resistance and flux linkage to generate voltage disturbance, the predictive control output deviates from the reference value and affects the smooth operation of the motor. Problem, the present invention provides a disturbance suppression method in the field weakening control mode of a permanent magnet synchronous motor, which specifically includes the following steps:

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  • Disturbance suppression method for permanent magnet synchronous motor in flux weakening control mode
  • Disturbance suppression method for permanent magnet synchronous motor in flux weakening control mode
  • Disturbance suppression method for permanent magnet synchronous motor in flux weakening control mode

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Embodiment Construction

[0053] The method provided by the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0054] like figure 1 As shown, the overall flow of the method of the present invention includes four aspects: model establishment, deadbeat current prediction control, field weakening control and sliding mode control algorithm online disturbance observation. The above four aspects are described in detail below:

[0055] 1. Model establishment

[0056] When the motor is running, the motor controller can collect the running status information of the motor in real time, and the running status information includes current, speed, and rotor position. The controller can obtain the corresponding switching sequence of the inverter according to the collected motor running state information combined with the corresponding control strategy, so as to drive the motor to run.

[0057] The voltage equation of the permanent magnet synchronous motor ...

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Abstract

The invention discloses a disturbance suppression method for a permanent magnet synchronous motor in a flux weakening control mode. In the flux weakening control mode of a permanent magnet synchronousmotor driving system, when parameters such as inductance, resistance and flux linkage are disturbed, quadrature-axis and direct-axis currents deviate from reference values, the torque following effect is reduced, and as a result, the motor response noise is increased, and the stable operation of a motor is influenced. The invention just aims to solve the above problem. With a stator current observation principle based on sliding mode exponential reaching law control, system disturbance caused by parameter mismatch can be accurately observed, so that the problem of motor operation instabilitycaused by disturbance is inhibited, and the motor response condition is improved. Compared with traditional flux weakening control research, the method of the invention introduces a solution in a parameter mismatch environment and has the advantages of being simple in design, good in dynamic and static following performance and the like.

Description

technical field [0001] The invention relates to the field of disturbance suppression under the flux-weakening control mode of a permanent magnet synchronous motor, in particular to the observation and compensation of voltage disturbance under the mismatch of inductance, resistance and flux linkage in the flux-weakening mode of a permanent magnet synchronous motor. Background technique [0002] Due to the constant excitation strength of the permanent magnet of the permanent magnet synchronous motor, when the speed is greater than the base speed and the constant power operation area, the voltage saturation of the output voltage of the inverter will make the speed unable to increase further, thus limiting the application range. In order to overcome this problem, the field usually uses the control method of reducing the excitation current of the separately excited DC motor to increase the speed and combining the field weakening control technology to realize the large-scale perman...

Claims

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Application Information

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IPC IPC(8): H02P21/00H02P21/13H02P21/14H02P25/022
CPCH02P21/0089H02P21/0003H02P21/0007H02P21/13H02P21/14H02P25/022H02P2207/05
Inventor 张硕王书琳张承宁赵明威
Owner BEIJING INSTITUTE OF TECHNOLOGYGY