A cascaded robust fault-tolerant predictive control method for permanent magnet synchronous motors

Abstract

The invention discloses a cascade robust fault-tolerant predictive control method of a permanent magnet synchronous motor. The implementation steps of the method include obtaining the rotational speed, voltage and current of the permanent magnet synchronous motor, and designing a fault detection integral terminal sliding mode observer to obtain observation of fault items. value; design a robust fault-tolerant predictive speed controller, calculate the q-axis command current according to the given speed, response speed, and fault item observations; design a robust fault-tolerant predictive current controller, according to the given current, response current, and fault item observations Value to calculate the command voltage, through inverse Park transformation, SVPWM module modulation to generate PWM pulse signal, so as to drive the permanent magnet synchronous motor to work. The invention realizes fast, robust and no static error tracking of the rotational speed and current of the permanent magnet synchronous motor, and improves the control accuracy and operation reliability of the permanent magnet synchronous motor. The invention is beneficial to expand the application of the permanent magnet synchronous motor in occasions with harsh environments and high reliability requirements.

Description

technical field [0001] The invention relates to the control technology of a permanent magnet synchronous motor, in particular to a cascade robust fault-tolerant predictive control method of a permanent magnet synchronous motor. Background technique [0002] Permanent magnet synchronous motors have been widely used due to their advantages of simple structure, high efficiency and low failure rate. People have also put forward higher requirements on the control performance of permanent magnet synchronous motors. Vector control is the most commonly used method for high-performance control of permanent magnet synchronous motors, and the control of speed loop and current loop is the key. The traditional speed loop and current loop controllers are PI controllers, which are widely used in permanent magnet AC motor drives due to their simplicity and robustness. However, the PI controller has the following disadvantages. First, the parameter setting of the PI controller only corresp...

AI Technical Summary

Problems solved by technology

However, the PI controller has the following disadvantages. First, the parameter setting of the PI controller only corresponds to a certain working range

Therefore, when the working state of the motor changes, the control effect of the PI controller cannot be optimal

Second, the permanent magnet synchronous motor system is a nonlinear system with parameter changes, and there is a risk of permanent magnet demagnetization

Although predictive control has many advantages, predictive control is easily affected by changes in motor system parameters

The perturbation of the parameters and the demagnetization of the permanent magnet synchronous motor during the operation of the permanent magnet synchronous motor will reduce the control accuracy of the permanent magnet synchronous motor and affect the reliability of its operation

Images