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Dynamic matrix control method for permanent magnet synchronous motor

A dynamic matrix control, permanent magnet synchronous motor technology, applied in motor control, motor generator control, electronic commutation motor control, etc., can solve the problems of PMSM application impact, cost increase, PMSM weight and volume increase, etc. unaffected effects

Inactive Publication Date: 2019-03-01
TIANSHUI ELECTRIC DRIVE RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to realize the DMC control of the oil drilling rig system PMSM, it is necessary to use a coaxial mechanical position sensor to measure the rotor position and speed information. However, this has caused some disadvantages: 1. The weight and volume of the PMSM increase, resulting in an increase in cost; 2. Coaxial installation The precision requirement is high, if it is not met, it will seriously affect the normal operation of PMSM, and the anti-disturbance performance of PMSM will be reduced due to the increase of components; Large impact, making the application of PMSM in oil drilling rig system affected

Method used

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  • Dynamic matrix control method for permanent magnet synchronous motor
  • Dynamic matrix control method for permanent magnet synchronous motor
  • Dynamic matrix control method for permanent magnet synchronous motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] A dynamic matrix control method for a permanent magnet synchronous motor, the steps are as follows:

[0085] 1. Establish the dq-axis mathematical model of PMSM, use the extended Kalman filter EKF as a random observer, and correct the predicted variables through the observed variables of the extended Kalman filter algorithm, so as to obtain the optimal predicted value;

[0086] 2. Use the extended Kalman filter EKF to construct vector control, set the rotor flux linkage, speed and rotor position angle as the state variables, and the stator voltage as the input variable. If the sampling frequency of the closed-loop control of the speed is compared with the mechanical time constant of the motor or If the moment of inertia is large enough, the speed is constant in the sampling period, so that the speed estimation error is attributed to the system noise, and the accuracy of the motor model is not affected;

[0087] 3. Realize PMSM with DMC algorithm. DMC algorithm uses the ...

Embodiment 2

[0090] As a preference for Example 1, the PMSM is a surface-mounted PMSM. When PMSM is used as the driving equipment of the oil drilling rig system, the surface-mounted PMSM is used as the research object because the permanent magnet pole of the surface-mounted PMSM is convenient for the realization of the optimal design and is conducive to improving the control performance of the motor.

[0091] The dq-axis mathematical model of PMSM is established as follows:

[0092] Voltage Equation (1)

[0093]

[0094] Electromagnetic torque equation (2)

[0095]

[0096] Mechanical Equations of Motion (3)

[0097]

[0098] In the formula, i d , i q and u d , u q are the dq components of stator current and voltage respectively; L d , L q and ψ d , ψ q are the dq components of the stator inductance and flux linkage; R S is the stator resistance; ω is the rotor mechanical angular velocity; n p is the polar logarithm; ψ f is the permanent magnet flux linkage; T e ,T ...

Embodiment 3

[0104] As a preference to embodiment 2, the steps of the extended Kalman filter algorithm include:

[0105]

[0106]

[0107] Among them, M and N are the covariance matrix of V and W respectively, K(k+1) is the gain matrix, the superscript ~ is the predicted value, and the superscript ∧ is the check value.

[0108] In the second step, using the extended Kalman filter EKF to construct vector control refers to: the dq axis is the αβ axis model, the EKF observer is designed under the αβ axis, the EKF is used to construct the vector control, and the rotor flux linkage ψ α 、ψ β , the rotational speed ω and the rotor position angle θ are the state variables, and the motor state equation and measurement equation take the stator voltage as the input variable. If the sampling frequency of the closed-loop control of the rotational speed is sufficiently large compared to the mechanical time constant or moment of inertia of the motor, the rotational speed is in The sampling period ...

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Abstract

The invention discloses a dynamic matrix control method for a permanent magnet synchronous motor. The dynamic matrix control method comprises the following steps: firstly, establishing a dq-axis mathematical model of PMSM, taking an extended Kalman filter EKF as a random observer, and carrying out correction on predictive variables through observation variables of an extended Kalman filter algorithm so as to obtain an optimal predicted value; secondly, using the extended Kalman filter EKF to construct vector control; thirdly, using a DMC algorithm to realize PMSM, and using the step response of objects through the DMC algorithm, wherein the implementation steps comprise model prediction, rolling optimization and feedback correction; and fourthly, forming a DMC vector control structure of the permanent magnet motor based on the EKF. According to the dynamic matrix control method, the model after variable substitution can be considerably controllable, the rotating speed output through EKF prediction replaces the rotating speed measured by a sensor in original dynamic matrix control for the permanent magnet synchronous motor, so that the whole control process is completed through a computer, the controllability of the system is improved, and the dynamic matrix control method is convenient to use in more occasions.

Description

technical field [0001] The invention relates to a dynamic matrix control method of a permanent magnet synchronous motor, belonging to the technical field of permanent magnet synchronous motor applications. Background technique [0002] In the exploration and production of oil drilling rig system, due to the complex environmental conditions and geological structure, it has the characteristics of nonlinearity and uncertainty in actual work, and the drilling rig requires a good dynamic response in terms of drive motors, and the load changes In order to maintain the stable speed at the same time, the application of DMC (Dynamic Matrix) in predictive control to the PMSM (Permanent Magnet Synchronous Motor) drilling rig system will have a better control effect for these problems. [0003] PMSM is famous for its advantages such as high dynamic performance, high efficiency and light weight. By combining microelectronic control technology and power electronic technology, it can desig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/24H02P21/14H02P21/20H02P21/18
CPCH02P21/0003H02P21/141H02P2207/05H02P21/18H02P21/20H02P21/24
Inventor 朱奇先刘小宝董海鹰丁军怀王睿敏张振中
Owner TIANSHUI ELECTRIC DRIVE RES INST
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