Method for controlling salient pole permanent magnet synchronous machine in speed sensorless mode

Abstract

The invention discloses a method for controlling a salient pole permanent magnet synchronous machine in a speed sensorless mode, and belongs to the field of motor speed regulation. The method is characterized by including the steps of estimating effective counter electromotive force through an established full-order state sliding-mode observer according to the stator voltage and stator current measured in real time, and then obtaining the position and the rotating speed of a rotor through a locking phase ring. By means of the method, the problem of controlling the salient pole permanent magnet synchronous machine in the speed sensorless mode is solved, influences of motor parameters on speed sensorless control are smaller, robustness of deviation between position estimation and rotating speed estimation of the rotor is improved, sliding-mode noise is prevented from being amplified, and stability of the system is ensured.

Description

technical field [0001] The invention relates to a method for speed sensorless control of a motor, in particular to a method for realizing speed sensorless control of a salient-pole permanent magnet synchronous motor for wind power generation. Background technique [0002] In response to the energy crisis, new energy technologies have been vigorously developed. Wind energy is an inexhaustible renewable energy source, and wind power generation technology has become the top priority of new energy technology. Salient-pole permanent magnet synchronous motors are widely used in wind power generation systems due to their high power density and high reliability. To improve system reliability, wind power systems often require speed sensorless control. There are many commonly used speed sensorless control methods, such as high-frequency signal injection method, model reference adaptive method and sliding mode observer method. [0003] The invention patent applications "A Built-in P...

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Problems solved by technology

[0003] Invention patent applications "a built-in permanent magnet synchronous motor position sensorless vector control device" (CN102361430A) and "position sensorless motor control system and control method" (CN102624322A) both proposed a permanent magnet synchronous motor based on high-frequency signal injection The speed sensorless control method, but the high frequency signal injection method is only suitable for low speed areas, not suitable for high power wind power generation systems

Invention patent application "A Position Sensorless Control Method for Permanent Magnet Synchronous Motor" (CN103051271A) designed a speed sensorless control method for permanent magnet synchronous motors based on the model reference self-adaptive principle, but it is seriously affected by motor parameters

The invention patent application "Sensorless Control System of Permanent Magnet Synchronous Motor" (CN101964624A) proposed a speed sensorless control algorithm of permanent magnet synchronous motor based on the second-order sliding mode observer. However, because the estimated back EMF contains high frequency sliding mode noise , filtering must be performed, but filtering brings a phase delay, and phase compensation must also be performed, which leads to complex system implementation, and the angle estimation is seriously affected by the estimated value of the rotational speed

[0004] The conference document "Rotor Position Estimation with Full-Order Sliding-Mode Observer for Sensorlesss IPMSM" published by Wang Gaolin of Harbin Institute of Technology in 2012 proposed a speed sensorless control method for salient pole permanent magnet synchronous motors based on extended back electromotive force, which solved the two problems. However, the salient pole permanent magnet synchronous motor model based on extended back electromotive force is affected by three parameters: motor stator resistance, d-axis inductance and q-axis inductance

In the paper "A Family of Sensorless Observers with Speed ​​Estimate for Rotor Position Estimation of IM and PMSM Drives" published by Mihai Comanescu and other scholars in 2012, a full-order sliding mode observer for surface-mounted permanent magnet synchronous motors was designed, and the rotor The robustness of position estimation to speed estimation error, but in order to improve its robustness, it is necessary to increase the sliding mode gain, but increasing the sliding mode gain will amplify the sliding mode noise, which will lead to system instability in severe cases, and this method cannot Directly applied to salient pole permanent magnet synchronous motor

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