A fast identification method for permanent magnet synchronous motor inductance with double pulse high frequency square wave voltage injection
A technology of permanent magnet synchronous motor and square wave voltage, which is applied in the direction of motor generator control, electronically commutated motor control, control generator, etc., can solve problems such as slow convergence speed, weak applicability, and poor algorithm robustness, and achieve The effect of small calculation and fast recognition speed
Active Publication Date: 2022-04-05
ZHEJIANG UNIV OF TECH
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Problems solved by technology
Existing inductance identification methods, such as finite element analysis, least squares algorithm, model reference adaptive method, high-frequency sinusoidal voltage injection method, and other intelligent identification algorithms, have weak applicability, slow convergence speed, and poor algorithm robustness. , to achieve complex issues such as
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[0075] The present invention will be further described below in conjunction with the accompanying drawings.
[0076] refer to Figure 1 ~ Figure 4 , a double-pulse high-frequency square wave voltage injection permanent magnet synchronous motor inductance fast identification method, the identification method includes the following steps:
[0077] Step 1, establish the mathematical model of the permanent magnet synchronous motor on the inductance anisotropic coordinate system, the process is as follows:
[0078] 1.1, considering the cross-saturation effect of the magnetic field, in the dq two-phase synchronous rotating coordinate system, the stator voltage state equation of the permanent magnet synchronous motor is expressed in the form of a matrix as follows:
[0079]
[0080] In the formula, are the voltage and current on the d and q axes in the rotor reference frame, respectively; R s is the stator resistance, L d , L q is the absolute inductance of the d and q axes,...
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A method for quickly identifying the inductance of a permanent magnet synchronous motor with double-pulse high-frequency square wave voltage injection, comprising the following steps: Step 1, establishing a mathematical model of the permanent magnet synchronous motor on the inductance anisotropic coordinate system; Step 2, estimating the synchronous rotation Implement double-pulse high-frequency square wave voltage injection on the coordinate system Step 3, calculate and estimate the high-frequency response current increment on the synchronous rotating coordinate system; Step 4, calculate the cross saturation angle; Step 5, identify d, q axis self-inductance and dq axis between the cross-saturation inductance. The inductance identification method provided by the present invention has a small calculation amount and a fast identification speed. It only needs four PWM cycles to execute an identification algorithm, and can identify cross saturated inductance, and is suitable for on-line or off-line inductance identification.
Description
technical field [0001] The invention relates to the technical field of permanent magnet synchronous motor drive control, in particular to a method for quickly identifying the inductance of a permanent magnet synchronous motor injected with a double-pulse high-frequency square wave voltage. Background technique [0002] Vector control is the main control technology of permanent magnet synchronous motor at present. However, this control technology requires accurate electrical parameters, such as permanent magnet flux linkage, stator resistance, dq axis inductance, etc. Among them, the accuracy of the inductance parameters directly affects the control performance of the motor system, such as position observer based on fundamental wave model, maximum torque current ratio control, model predictive control, etc. However, due to the asymmetry of the d-axis and q-axis magnetic circuit structure of the permanent magnet synchronous motor and the magnetic field saturation characteristi...
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IPC IPC(8): H02P21/14H02P21/18H02P21/06H02P21/22H02P25/026H02P27/08H02P6/18H02P6/16H02P6/34
CPCH02P21/14H02P21/18H02P21/06H02P21/22H02P25/026H02P27/08H02P6/183H02P6/16H02P6/34H02P2203/11H02P2207/05
Inventor 吴春陈科南余荣
Owner ZHEJIANG UNIV OF TECH