An Optimal Design Method for pi Parameters of Speed Loop of Asynchronous Motor
An asynchronous motor, optimized design technology, applied in the direction of control generator, motor generator control, electronic commutation motor control, etc., can solve the problems of asynchronous motor speed loop speed fluctuation, overcurrent, etc., to achieve the effect of improving dynamic and static performance
Active Publication Date: 2021-03-19
WISDRI WUHAN AUTOMATION
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[0004] In order to solve the problem of speed fluctuation and serious overcurrent of the asynchronous motor speed loop under vector control, the present invention proposes an optimal design method for PI parameters of the asynchronous motor speed loop
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[0047]The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0048] Combine below Figure 1 to Figure 6 Introduce the embodiment of the present invention, concrete steps are:
[0049] Step 1: Construct the relationship model of the asynchronous motor voltage and current, and construct the current loop open-loop transfer model according to the relationship model of the asynchronous motor voltage and current, and further obtain the current loop PI parameters according to the engineering setting method;
[00...
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The invention provides an asynchronous motor speed loop PI parameter optimization design method. The method comprises the following steps: constructing a relation model of voltage and current of the asynchronous motor, constructing a current loop open-loop transfer model according to the relation model of the voltage and the current of the asynchronous motor, and further obtaining a current loop PI parameter according to an engineering setting method; simplifying a current loop open-loop transfer function, constructing a speed loop open-loop transfer model, and obtaining a speed loop PI parameter according to the speed loop open-loop transfer model and the engineering setting method; running the PI parameters which are not optimally designed in an actual system; calculating a delay parameter of the actual system to obtain an actual delay time of the speed loop on the engineering; obtaining an actual delay time coefficient of the speed loop on the engineering through the actual delay time of the speed loop on the engineering; optimally designing PI parameter values and bringing the PI parameter values into the actual system to enable the PI parameter values to run stably; and the asynchronous motor speed loop PI parameter optimization design method realizes the optimal control of the speed loop and improves the dynamic and static performance of the system.
Description
technical field [0001] The invention relates to an asynchronous motor control technology, in particular to a PI parameter optimization design method of a speed loop of an asynchronous motor. Background technique [0002] At present, most of the self-tuning technologies used in industry are self-tuning methods based on parameter models. The guiding idea is to first analyze and identify the mathematical model of the control object, and then use the tuning algorithm to tune the controller parameters on this basis. Among them, the PI self-tuning algorithm is widely used in the field of industrial control because of its simple structure, good stability, reliable operation and convenient adjustment. However, in metallurgy, steel and other automatic frequency converters, the speed loop delay of asynchronous motors is difficult to estimate due to the variety of delay links and the complexity of the system, which leads to the inability of the parameters of the model to correspond to ...
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IPC IPC(8): H02P21/00
CPCH02P21/0003
Inventor 许小龙王胜勇卢家斌王傲能
Owner WISDRI WUHAN AUTOMATION