PMSM無位置傳感器混合控制策略研究
[Abstract]:Permanent magnet synchronous motor (PMSM) is widely used in modern industrial society, especially in the field of electrical transmission. Vector control strategy is usually used for high performance PMSM drive. Real-time rotor position information is indispensable. The traditional position sensor will bring many problems. Using the position sensor control technology instead of the position sensor can reduce the cost of the control system, reduce the volume and weight, increase the power density, be more reliable and easy to install. Therefore, sensorless control technology has high research value. In this paper, the position sensorless control algorithm of PMSM is taken as the main research content, and the accurate observation of rotor position and speed can be realized in the whole speed range. A hybrid control strategy without position sensor is proposed. The control technology can be used in washing machines, air-conditioners and other household appliances, or in electric vehicle driving systems and other occasions. In the position sensorless hybrid control strategy proposed in this paper, the improved high frequency voltage injection method is used in the zero and low speed operation section, and the improved sliding mode observer method is used in the middle and high speed section. The complete implementation of the control strategy is given. In this paper, the improvement of the traditional high frequency voltage injection method mainly includes two aspects. One is to introduce the characteristic harmonic elimination method to replace the low-pass filter in the current feedback loop. It avoids the problems of phase lag and incomplete filtering brought by filter. Secondly, using phasor method to deduce the high frequency current carefully, considering the influence of armature winding resistance neglected in the traditional scheme, putting forward the corresponding compensation strategy, thus making the estimation of rotor position and speed more accurate. Thus, better dynamic and static control performance is obtained. In this paper, an improved sliding mode observer method is proposed in the middle and high speed region. The sliding mode observer is constructed for two kinds of PMSM, namely, the surface mount observer and the embedded one. The buffeting strategy of the traditional sliding mode observer method is designed for the buffeting problem of the traditional sliding mode observer method. The accuracy of position and speed estimation is improved. In order to widen the speed range of PMSM, the MTPA control is used under the rated speed and the weak magnetic field control is used above the rated speed. The MTPA and the weak magnetic algorithm designed in this paper take into account the change of inductance parameters. For the proposed position sensorless hybrid control strategy, the switching method of high frequency voltage injection and sliding mode observer and the switching method between MTPA and weak magnetic field control are also designed. In order to verify the proposed control strategy, this paper simulates the proposed control strategy in Matlab/Simulink, and carries out experimental verification on a set of industrial PMSM driver hardware platform. The experiments such as starting, speed step setting, torque mutation and efficiency measurement are carried out. The simulation and experimental results show that the proposed control strategy has a high accuracy for the estimation of rotor position and speed, and the closed-loop control has good steady and dynamic performance and can be started. The smooth switching between the two sensorless strategies and the high speed weak magnetic field operation prove the effectiveness and advantage of the proposed hybrid control strategy. The control strategy can be extended to household appliances, electric vehicles and other occasions.
【學位授予單位】:浙江大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TM341
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