Permanent magnet synchronous motor direct torque control method based on model predictive control

Abstract

The invention discloses a permanent magnet synchronous motor direct torque control method based on model predictive control, and belongs to the technical field of control. The invention aims to provide the manent magnet synchronous motor direct torque control method based on model predictive control, wherein by means of an electric vehicle wheel hub motor drive control method based on extended Kalman estimation and model predictive control, the defects in the prior art can be well overcome. According to the permanent magnet synchronous motor direct torque control method based on model predictive control, firstly, an extended Kalman principle is used for completing motor drive system estimator designing, secondly, torque and flux linkage values obtained by the estimator are used as feedbackvalues which are transferred to a motor control system controller along with reference set values, and finally, by solving an optimum control problem corresponding to a target function, fast accuratetracking control of motor torque and flux linkage is completed by the system. By means of the permanent magnet synchronous motor direct torque control method based on model predictive control, the problems of complex coordinate change and current magnitude coupling in a motor model are effectively solved, the system complexity is reduced, and dynamic response speed of the system and the intuitionism and the reliability of a system control effect are improved.

Description

technical field [0001] The invention belongs to the technical field of control. Background technique [0002] With the continuous pursuit of people's quality of life and the rapid development of the automobile industry, the number of automobiles in my country has continued to grow steadily in recent years, and the dependence on foreign oil has continued to increase, which has seriously threatened my country's energy security. The use of a large number of fuel vehicles has further aggravated the deterioration of the environment. Due to the advantages of high energy efficiency, zero emissions, and low pollution, electric vehicles have become the development trend of future vehicles. Since 2001, my country has started to implement major scientific research projects aimed at key core technologies such as batteries, motors, and electronic controls for electric vehicles. [0003] The electric vehicle driven by the in-wheel motor is a research hotspot in recent years. The biggest...

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Problems solved by technology

[0004] 1. The mathematical model of the permanent magnet synchronous hub motor is complex, and there is a current coupling problem, which depends heavily on the motor parameters. Especially in the method of controlling the current by means of the current, the transformation of the current in different coordinate systems increases the calculation of the control system. , resulting in the defect of slow dynamic response, which affects the real-time control of the in-wheel motor drive system on electric vehicles, especially in the case of sudden environmental changes, the drive system cannot respond in time and may easily cause traffic accidents

[0005] 2. There is a problem of inaccurate estimation in the feedback link. When the control system needs to directly track and control the torque and flux linkage, the actual torque and flux linkage values ​​at the current moment cannot be obtained directly through measurement, and can only be obtained through estimation. , the estimated deviation of torque and flux linkage will directly affect the control effect of the motor drive system, and the torque tracking error of the drive system will cause hidden dangers in the operation and control of electric vehicles

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