Method for high-precision online observation of rotor resistance and flux linkage of induction motor
A technology of rotor resistance and induction motor, applied in the control of generator, motor control, motor generator control and other directions, can solve the problems of inconsistent models, affecting the observation accuracy of rotor flux linkage, etc., to achieve the effect of improving accuracy and performance
Active Publication Date: 2020-05-26
WUXI TONGWEI TECH
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Problems solved by technology
The linear model of the induction motor completely ignores the saturation characteristics of the motor, causing the model to be inconsistent with the actual controlled object, which will further affect the observation accuracy of the rotor flux linkage
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[0033] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0034] Such as Figure 1-8 As shown, the present invention provides a method for high-precision online observation of induction motor rotor resistance and flux linkage. The specific steps are as follows:
[0035] 1), measure the necessary induction motor parameters:
[0036] Measuring the Stator Resistance R of an Induction Motor Offline s , Stator leakage inductance L sl and rotor leakage inductance L rl .
[0037] Also, the magnetization curve of the induction motor is measured off-line. The measured magnetization curves are as image 3 , and then transform the magnetization curve into Figure 4 the form shown.
[0038] image 3 and Figure 4 in, i m is the magnetizing current; L m is the mutual inductance between the stator...
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The invention provides a method for high-precision online observation of rotor resistance and flux linkage of an induction motor, relates to the field of induction motor parameter identification, andaims to improve the observation precision of induction motor parameters and the robustness of a system. The inductance of the induction motor is influenced by saturation and varies with the operatingconditions of the motor in value; and the resistance is influenced by the temperature, a skin effect and an approaching effect, and the value change is more complex. Most of the prior art only considers the influence of temperature on resistance, the used induction motor model does not take saturation into consideration, and the inconsistency of the model and an actual controlled object influencesthe observation precision of the rotor flux linkage of the induction motor. According to the method provided by the invention, the system state observer is combined with a PI controller, and meanwhile, the rotor resistance under the influence of various factors can be accurately observed in real time based on the saturation model of the induction motor, so that the observation precision of the rotor resistance and flux linkage of the induction motor and the robustness of the system are improved.
Description
technical field [0001] The invention relates to the technical field of induction motor parameter identification, in particular to a high-precision online observation method for induction motor rotor resistance and flux linkage. Background technique [0002] In industrial applications, vector control is widely used for induction motors. In order to obtain high-performance induction motor vector control effect, the d-axis of the dq axis in vector control needs to be accurately aligned with the flux linkage of the induction motor. The flux linkage of an induction motor cannot be directly measured by a sensor, therefore, it needs to be estimated with high precision. When an induction motor is installed with a speed sensor, the d-axis of the dq-axis is generally oriented to the rotor flux linkage. [0003] The estimation accuracy of rotor flux linkage is affected by the accuracy of rotor resistance and rotor inductance. If the rotor resistance value, or the rotor inductance va...
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IPC IPC(8): H02P21/13H02P21/14
CPCH02P21/13H02P21/14H02P2207/01
Inventor 陆飞迪特·格林髙克辛康
Owner WUXI TONGWEI TECH