Full-order flux observer feedback matrix acquisition method and non-speed sensor

Abstract

A full-order flux observer feedback matrix acquisition method and a non-speed sensor belong to the technical field of motors. The method obtains a feedback matrix G under the condition of state stability requirement of full-order flux linkage observer and stability constraint of speed estimation of asynchronous motor. The obtained feedback matrix is applied to non-speed sensor control of asynchronous motors to improve the instability region of asynchronous motors in the low-speed power generation region. By selecting the designed feedback gain matrix, the invention can improve the instabilityproblem when the asynchronous motor is in the low-speed power generation region. By selecting the parameters of the configuration feedback gain matrix, the critical frequency can be reduced and the unstable region can be reduced.

Description

technical field The invention relates to the technical field of motors, in particular to a method for obtaining a feedback matrix of a full-order flux observer and a speed sensorless sensor. Background technique The traditional V / F (Variable Voltage Variable Frequency) control method of asynchronous motors is widely used in general-purpose inverters because of its simple principle, easy implementation and good parameter robustness. The design of asynchronous motor flux observer is the key to the high-performance control of asynchronous motors. At present, the common observer types include voltage model flux observer, current model flux observer, full-order flux observer and nonlinear observer, including Sliding mode observer, Kalman filter. The voltage model flux observer uses the voltage and current signals to estimate the back EMF of the motor, and then obtains the corresponding flux linkage through integration. It does not depend on the motor speed and is completely rob...

AI Technical Summary

Problems solved by technology

In view of the above analysis, the present invention aims to provide a full-order flux observer feedback matrix parameter acquisition method and a speed sensor, by adjusting the feedback matrix parameters, solve the low-speed power generation instability problem of the asynchronous motor in the speed sensorless control

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