Switched reluctance motor fractional order sliding mode controller design method and control system

Abstract

The invention particularly discloses a switched reluctance motor fractional order sliding mode controller design method. The method is characterized by comprising the following steps: based on an electromechanical contact equation of the switched reluctance motor, a switched reluctance motor model is built; based on the switched reluctance motor model, switching manifold surface design is carriedout; a Lyapunov function is used to verify the stability of the fractional order sliding mode control, and a fractional order sliding mode control law meeting an approximation condition is thus designed; parameters in the fractional order sliding mode control law are tuned; and a fuzzy inference algorithm is used to tune a fractional order sliding mode control switch gain epsilons. By using the characteristic of slowly transmitting energy with the fractional order of one more order r degree of freedom, the chattering problem of the traditional sliding mode control on the switching manifold surface can be weakened, the system has strong robustness towards parameter changes and outer disturbance, and when the motor operates at a low speed, torque pulsation can be effectively lessened, and the noise of the switched reluctance motor is weakened.

Description

technical field [0001] The invention relates to the technical field of oilfield equipment application, in particular to a design method and a control system of a fractional-order sliding mode controller for a switched reluctance motor. Background technique [0002] As the old oil wells gradually enter the oil-lean period, the new oil wells need to carry out oil test and test production before they are officially put into production, so as to prove the regional industrial oil and gas reserves. The working cycle of oil testing and production testing is generally not long, and the vehicle-mounted oil testing and production testing lifting equipment can meet the rapid movement between different oil wells, and can adapt to the special terrain and location characteristics of different oil wells. [0003] The current technology adopts a frequency conversion speed regulation system composed of a frequency converter and an asynchronous motor, which is applied to the vehicle-mounted o...

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Problems solved by technology

[0004] 1. The traditional sliding mode control is to design the switching surface and the control quantity of the system, and switch the control quantity back and forth uninterruptedly, so that the system is constrained on the switching surface, and the state variables of the system will automatically slide to the relatively stable origin of the system. There is chattering problem at the switching flow surface

[0005] 2. The motor drive of the vehicle-mounted oil testing and production lifting equipment needs frequent starting, braking and forward and reverse rotation, resulting in a large winding current of the frequency conversion speed regulation system, causing serious heating of the asynchronous motor, and causing the motor to be easily damaged;

[0006] 3. The main power conversion circuit of frequency conversion speed regulation has the threat of bridge arm through short circuit;

[0007] 4. The switching frequency of variable frequency speed regulation is high, and the power consumption is high, which increases the thermal impulse aging of IGBT, increases the high-frequency loss current of electrolytic capacitor, and reduces the service life of IGBT

[0008] 5. The rotor of the asynchronous motor in the frequency conversion speed regulation system is composed of squirrel cage bars, which has low mechanical strength and low reliability;

[0009] 6. In the frequency conversion speed regulation system, when a certain phase of the motor or controller fails, the motor cannot work

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