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Parameter identification method of permanent magnet synchronous motor based on inverter nonlinear compensation

A permanent magnet synchronous motor and non-linear compensation technology, which is applied in the control of generators, motor control, motor generator control, etc., can solve the problems of insufficient rank of identification equations, non-unique solutions of identification parameters, etc., and achieve the effect of improving accuracy

Inactive Publication Date: 2018-06-19
WUHAN UNIV OF TECH
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: in view of the influence of the nonlinearity of the inverter on the parameter identification accuracy, the identification equations generated by the multi-parameter identification of the motor using a single method are out of rank, and the problem of non-unique solutions of the identification parameters occurs

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  • Parameter identification method of permanent magnet synchronous motor based on inverter nonlinear compensation
  • Parameter identification method of permanent magnet synchronous motor based on inverter nonlinear compensation
  • Parameter identification method of permanent magnet synchronous motor based on inverter nonlinear compensation

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with the accompanying drawings.

[0031] see figure 1 , the present invention comprises the following steps:

[0032] Step 1: On the basis of the vector control of the permanent magnet synchronous motor, study the nonlinearity of the inverter, consider the influence of the nonlinearity factor of the inverter on the parameter identification, and conduct an online dead zone for the error voltage caused by the nonlinearity compensate;

[0033] Step 2: On the basis of dead zone compensation, conduct offline identification of the parameters of the motor closed-loop control to improve the identification accuracy;

[0034] Step 3: Combine the least squares method and model reference adaptive method to realize simultaneous online identification of multiple parameters. Using the model reference adaptive method, the online identification of the inductance and permanent magnet flux linkage is carried out by us...

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Abstract

The invention discloses a parameter identification method of a permanent magnet synchronous motor based on an inverter nonlinear compensation. Firstly, based on the vector control of the permanent magnet synchronous motor, the nonlinearity of an inverter is studied, the influence of inverter nonlinear factors on parameter identification is considered, and the online dead zone compensation is carried out for error voltage brought by nonlinearity. Then, the offline identification of parameters of motor closed-loop control is carried out based on dead zone compensation, and the identification accuracy is improved. Finally, the multi-parameter simultaneous online identification is achieved with the combination of a least squares method and a model reference adaptive method. A motor inductance,a permanent magnet flux linkage and a resistance value can be identified at the same time for a short time at a low-speed condition, and the method has great popularization and application values.

Description

technical field [0001] The invention belongs to the technical field of parameter identification of permanent magnet synchronous motors, and in particular relates to a parameter identification method of permanent magnet synchronous motors based on inverter nonlinear compensation. Background technique [0002] Permanent magnet synchronous motor (PMSM) has become a research hotspot and has been widely used due to its simple structure, stable speed, fast dynamic response, strong overload capacity, high reliability, diverse structure, and wide application range. [0003] The commonly used control strategies for permanent magnet synchronous motors are vector control and direct torque control. The methods of vector control mainly include: i d =0 control, field weakening control, cosφ=1 control and maximum torque current ratio control. Vector control mainly adopts double closed-loop control, and the design of current loop and speed loop is based on PI control based on linear syste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/16H02P21/14H02P21/04H02P21/00
CPCH02P21/0017H02P21/04H02P21/141H02P21/16H02P2207/05
Inventor 胡红明刘雪骄方贺肖寒
Owner WUHAN UNIV OF TECH
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