Permanent magnet synchronous motor predicted current control method and system based on FOSMC

A technology of permanent magnet synchronous motor and control method, applied in control system, vector control system, motor generator control and other directions, can solve problems such as low robustness and slow dynamic response speed

Inactive Publication Date: 2019-07-16
XIAN UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a FOSMC-based permanent magnet synchronous motor predictive curr

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  • Permanent magnet synchronous motor predicted current control method and system based on FOSMC
  • Permanent magnet synchronous motor predicted current control method and system based on FOSMC
  • Permanent magnet synchronous motor predicted current control method and system based on FOSMC

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Embodiment Construction

[0087] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0088] The FOSMC-based permanent magnet synchronous motor predictive current control method of the present invention, such as figure 1 As shown, the specific operation process includes the following steps:

[0089] Step 1, in the three-phase static coordinate system, establish the voltage equation of the permanent magnet synchronous motor, and obtain the voltage equation, the stator flux linkage equation and the electromagnetic torque equation in the dq coordinate system through coordinate transformation;

[0090] The voltage equation of the permanent magnet synchronous motor in the three-phase stationary coordinate system in step 1 is shown in formula (1):

[0091]

[0092] where u A is the stator voltage of phase A, u B is the B-phase stator voltage, u C is the phase C stator voltage, R s is the winding resistance per phase, i A is...

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Abstract

The invention discloses a permanent magnet synchronous motor predicted current control method and system based on FOSMC; the method comprises the following steps of carrying out comparing on the rotorangular speed and a given rotating speed to obtain a rotating speed difference, and inputting the rotating speed difference into a fractional order sliding mode controller; next, enabling an equivalent current of a dq axis at the current moment to pass through a sliding mode disturbance observer to obtain a voltage compensation quantity and a current estimation value under the parameter change, and enabling the current estimation value and the reference current at the next moment to be input into a non-differential-beat current prediction controller; and finally, carrying out compensating onthe obtained voltage vector and the voltage compensation amount of the dq axis at the current moment, carrying out coordinate transformation, space vector modulation and inversion, and obtaining a three-phase voltage to the permanent magnet synchronous motor, so that the stable operation of the motor is ensured. According to the method and the system disclosed by the invention, fractional order calculus and sliding mode variable structure control are combined, the fractional order calculus has more freedom degree, and the shaking of the system in the sliding mode process can be weakened, so that the control precision of the rotating speed is improved.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet synchronous motors, in particular to a FOSMC-based permanent magnet synchronous motor predictive current control method, and also to a FOSMC-based permanent magnet synchronous motor predictive current control system. Background technique [0002] In the AC speed control system, the permanent magnet synchronous motor (Permanent Magnet Synchronous Motor, PMSM) as the controlled object has the advantages of simple structure, wide speed range, high efficiency, reliable operation, small size, and good dynamic and static characteristics. The permanent magnet synchronous motor control system is a strongly coupled and changeable nonlinear system. At present, most of the PMSM speed control systems use the PI control algorithm, which has the advantages of simple algorithm, high reliability and convenient speed control, and can meet the requirements within a certain range. The advantages of control ...

Claims

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Application Information

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IPC IPC(8): H02P21/22H02P21/00
CPCH02P21/0007H02P21/22
Inventor 尹有为文叶叶杨志强李磊赵金伟许烨文
Owner XIAN UNIV OF TECH
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