Motor parameter online identification method only knowing single parameter
A technology of motor parameters and identification methods, which is applied in the control of generators, motor generators, electronic commutation motor control, etc. The effect of high efficiency and speeding up identification efficiency
Active Publication Date: 2022-02-01
BEIJING INFORMATION SCI & TECH UNIV +1
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Problems solved by technology
[0002] Since my country does not have a unified national standard for the calibration of motor factory parameters, many motor parameters have errors and errors after leaving the factory, and the parameters of the motor will also change with temperature changes during operation, which seriously affects The system stability of the motor
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[0071] The technical solution of the present invention is: an online motor parameter identification method that only knows a single parameter, which is characterized in that, in actual operation, only any one parameter is obtained, and the motor can be identified online, taking a three-phase motor as an example. As follows, other phase motors are also handled similarly:
[0072] 1) Collect the current of each phase in real time through the current sensor, and transform the collected current through coordinate transformation to obtain the direct axis current i under the rotating coordinatesd and quadrature current i q , then for the direct axis current i d and quadrature current i q Composite current controller that performs PID control + lead / lag correction to obtain the required direct-axis control voltage u d and quadrature axis control voltage u q .
[0073]
[0074] Then, build the physical model of the motor in the rotating coordinate system:
[0075]
[0076] ...
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Disclosed is a motor parameter online identification method only knowing a single parameter. According to the method, each phase of current is obtained from a current sensor, a motor physical model is equivalent to a direct current motor model through vector control coordinate transformation, then a forgetting factor least square recurrence method is utilized, and online parameter identification can be carried out on the motor only by acquiring an arbitrary motor parameter; motor input variables are discretized, a relation between the input variables and the output variables is determined, a plurality of to-be-identified matrixes are obtained through calculation, and an arbitrary known motor parameter can avoid coupling among to-be-identified parameters in the matrixes; and a plurality of parameters such as quadrature-direct axis inductance, stator resistance, flux linkage and the like of the motor are identified by analyzing the plurality of matrixes to be identified. According to the motor parameter online identification method, on the condition that the minimum motor information is obtained, the multiple parameters needed by control can be efficiently and rapidly identified on line, the control performance and efficiency of the motor system are improved, the method can also be used for sensorless control of the motor, and the robustness and safety of the motor system are improved.
Description
technical field [0001] The invention belongs to the field of motor control, and in particular relates to an online identification method of motor parameters. Background technique [0002] Since my country does not have a unified national standard for the calibration of motor factory parameters, many motor parameters have errors and errors after leaving the factory, and the parameters of the motor will also change with temperature changes during operation, which seriously affects the stability of the motor system. However, in many special applications, when the parameters of the motor cannot be measured offline, it is particularly important to perform online parameter identification. In the present invention, the online parameter identification of the motor will be obtained from any known motor parameters, combined with the forgetting factor least squares method. Realize the identification of multiple parameters such as AC-D axis inductance, stator resistance and flux linkag...
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IPC IPC(8): H02P21/14
CPCH02P21/14H02P21/141
Inventor 司宾强杨庆达朱纪洪
Owner BEIJING INFORMATION SCI & TECH UNIV