基于自抗扰滑模控制的开关磁阻电机转矩分配控制策略

doi:10.19595/j.cnki.1000-6753.tces.231277

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Abstract

The research of new energy electric vehicles is currently a hot topic, and switched reluctance motor (SRM) is applied in the field of electric vehicles due to its simple structure, strong fault tolerance, and ease of control. Among them, motor torque ripple and system response speed are important indicators to measure the performance of motor drive systems. Sliding mode control is a nonlinear algorithm with the advantages of fast response speed and strong robustness. Sliding mode control includes sliding mode approach law and sliding mode surface. Due to the sign function used in traditional exponential approach law, which can cause system oscillation and cause large chattering in the control system, smooth function is used instead of the sign function, and system state variable is introduced to improve control flexibility. At the same time, in order to improve the convergence of traditional integral sliding surface, an improved integral sliding surface is proposed. Considering the nonlinearity of the parameters of switched reluctance motor, when the system operates under variable speed and load conditions, the load torque and inherent parameters of the motor have a significant impact on the operating effect of the motor. Therefore, the active disturbance rejection extended state observer (ADRESO) is used as a feedforward compensation for the sliding mode speed controller to adjust the uncertain parameters and load torque of the motor. The design of the ADRESO does not require an accurate mathematical model of the motor, and it can ensure the stability of the system under complex operating conditions and has strong robustness.
From the experimental results of an actual switched reluctance motor, it can be seen that under steady state operating conditions, when the motor load is 0.5N·m and the set speeds are 500r/min and 1000r/min, the proposed active disturbance rejection sliding mode control (ADRSMC) results in smaller motor pulsation. Under variable speed conditions, when the load torque is 0.2N·m, the starting time of the system under PI control and traditional sliding mode control is 0.7s and 0.25s, and the variable speed response time is 0.65s and 0.28s. The starting time of the system under the proposed ADRSMC is 0.07s, and the variable speed response time is 0.1s; when the load torque is 0.5N·m, the starting time of the system under PI control and traditional sliding mode control is 0.95s and 0.3s, and the variable speed response time is 0.73s and 0.5s. The starting time of the system under the proposed ADRSMC is 0.12s and the variable speed response time is 0.13s. And this method reduces the fluctuation of motor speed under stable operation. Under variable load conditions, when the set speed is 500r/min, the time taken for the system to return to the original state under PI control and traditional sliding mode control is 0.38s and 0.12s. The response time of the system under the proposed ADRSMC is 0.03s. When the set speed is 1000r/min, the time taken for the system to return to the original state under PI control and traditional sliding mode control is 0.43s and 0.33s. The response time of the system under the proposed ADRSMC is 0.08s. It indicates that the proposed ADRSMC can approach the original speed in a relatively short period of time.
Based on the results, it can be concluded that the proposed control strategy can effectively reduce the torque ripple of the motor and improve the response time of the system, while also improving the stability of the speed.

Key words： Switched reluctance motor torque sharing function control new type of sliding mode reaching law active disturbance rejection extended state observer

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TM352

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	Li Zonglin
	Chen Hao
	Qi Yong
	Wang Guanjun
	Ge Kai

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Li Zonglin,Chen Hao,Qi Yong等. Torque Sharing Function Control Strategy for Switched Reluctance Motor Based on Active Disturbance Rejection Sliding Mode Control[J]. Transactions of China Electrotechnical Society, 0, (): 1277-1277.

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