An Active Control Method for Low-Frequency Vibration of Electric Drive System

Abstract

The invention discloses an active control method for low-frequency vibration of an electric drive system. The active control method is characterized by comprising the following steps: determining a control scheme, measuring the rotating speed or acceleration of a motor according to the low-frequency vibration characteristic of the electric drive system, and designing an active control strategy; selecting a control algorithm, comparing the characteristics and current application statuses of various intelligent control algorithms, and determining a sliding mode variable structure control algorithm; defining a variable structure switching function, designing a variable structure control rate, exploring a key problem in the application of the sliding mode variable structure algorithm, namely, the root cause of vibration, and reasonably designing a switching function and a control rate; optimizing a switching function parameter according to a genetic algorithm, and applying a genetic algorithm thought to the optimization of the switching function parameter of a sliding mode variable structure in order to further eliminate vibration caused by sliding mode switching; determining a braking torque, and tracking a vibration signal through a controller to provide a brake torque for realizing active control on the low-frequency vibration of the electric drive system. The active control method has the advantages of good control effect, high adaptability and the like.

Description

technical field [0001] The patent of the present invention relates to the field of low-frequency vibration control of electric transmission system. The invention applies an active control method for low-frequency vibration of electric transmission system to realize the control of low-frequency vibration of electric transmission system. This method can be used to reduce low-frequency vibration and vibration of electric transmission system. Noise, improve system stability. Background technique [0002] Vibration is a common phenomenon in the operation of all electrical equipment. In the electrical transmission system, the motor, like other equipment, will vibrate to varying degrees during operation. The harm of vibration to the electrical transmission system is mainly manifested in the following aspects Aspects: increase energy consumption, reduce the efficiency of the power system; directly damage the motor bearings, accelerate the wear of the motor bearings, and greatly shor...

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Problems solved by technology

[0005] Variable structure control method, as a commonly used nonlinear control method, has good robustness for complex strongly coupled systems, but its main defect is that the sliding plane is designed with pole configuration or quadratic index optimization , the boundary layer thickness is given based on experience to eliminate trembling, so it is difficult to obtain a set of optimal sliding plane parameters and boundary layer thickness

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