PI parameter setting method for asynchronous motor speed-sensorless speed adjustment system

Abstract

The invention discloses a PI parameter setting method. The PI parameter setting method is suitable for a full-order flux observer-based asynchronous motor speed-sensorless speed adjustment system. Themethod includes the following steps that: step 1, motor parameters, full-order flux observer parameters and speed loop adjustment parameters are given; step 2, time Tsf of the conversion of a speed actual speed value into a speed estimated value is determined; step 3, the total delay time of a speed loop is determined, wherein the total delay time is represented by an equation that Tomega=Tsf+pic; step 4, the proportional coefficient ksp and integral coefficient ksi of a speed loop PI controller are calculated; and step 5, the feasibility of the parameter ksp and parameter ksi are verified, if the parameter ksp and parameter ksi do not satisfy a speed loop control requirement, the proportional coefficient kp and integral coefficient ki of a rotational speed adaptive law, and a speed loopbandwidth coefficient h are adjusted, the step 2 3, and 4 are repeated again until the parameter ksp and parameter ksi meet the requirement. According to the method of the invention, the transfer function of the speed actual speed value and the speed estimated value is established; and the delay time Tsf between the actual speed value and the estimated value is obtained through a numerical value calculation method; and the PI parameters of the system speed loop are calculated on the basis of an engineering setting method.

Description

technical field [0001] The invention belongs to the technical field of variable frequency speed regulation of asynchronous motors, and in particular relates to a method for setting PI parameters of a speed loop of an asynchronous motor speed sensorless control system. Background technique [0002] The asynchronous motor speed sensorless speed control system can reduce the cost of the speed control system, expand the scope of application, reduce the workload of system maintenance, and improve the reliability and adaptability of the system, which is highly valued by academic and engineering circles at home and abroad. The sensorless speed regulation technology of asynchronous motors has developed rapidly, and related products are widely used. When the sensorless speed control system of asynchronous motor adopts the full-order flux observer as the speed estimation method, it has relatively good performance in terms of steady-state error, dynamic performance, low-speed performan...

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Problems solved by technology

[0005] When tuning the parameters of the PI controller, it is necessary to determine the speed feedback delay time T ω , for the asynchronous motor speed sensorless speed control system based on the full-order flux observer, T ω Mainly depends on the conversion time of the speed actual value to the speed estimate T sf ,but, T sf It is related to the motor parameters of the asynchronous motor, the feedback matrix G and the PI parameters of the speed estimation system, and it is difficult to obtain

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