Sliding mode current compensation control system and method for switched reluctance motor

Abstract

The invention discloses a switched reluctance motor sliding mode current compensation control system and method. The system comprises a PID speed controller, a feedforward calculation module, a sliding mode current compensation module, a current distribution module, a current hysteresis module, an asymmetric half-bridge drive circuit, a switched reluctance motor, an encoder, a torque calculation module and a rotating speed calculation module. According to the invention, differential calculation processing is carried out on the rotating speed error signal through the PID speed controller and compensation is carried out on the input current of the switched reluctance motor through the sliding mode current compensation module, so that the commutation torque ripple of the switched reluctance motor can be effectively suppressed in the process of improving the load of the switched reluctance motor. The switched reluctance motor sliding mode current compensation control system and method can be widely applied to the technical field of switched reluctance motor speed regulation control.

Description

technical field [0001] The invention relates to the technical field of speed regulation control of switched reluctance motors, in particular to a sliding mode current compensation control system and method for switched reluctance motors. Background technique [0002] The structural feature of the switched reluctance motor (SRM) is that the rotor has neither windings nor permanent magnets, the stator poles are wound with concentrated windings, and the two radially opposite windings are connected to form one phase, with simple structure and reliable driving circuit. high starting torque, especially suitable for applications with frequent start and stop, and is expected to become the first choice for the power source of the next-generation new energy vehicles, but the double salient structure of the switched reluctance motor causes serious nonlinear characteristics of its phase inductance. This makes the torque ripple more serious during operation, which limits its application ...

AI Technical Summary

Problems solved by technology

[0002] The structural feature of the switched reluctance motor (SRM) is that the rotor has neither windings nor permanent magnets, the stator poles are wound with concentrated windings, and the two radially opposite windings are connected to form a phase, which has the advantages of simple structure and reliable driving circuit. High, large starting torque, especially suitable for frequent start-stop applications, and is expected to become the first choice for the power source of the next generation of new energy vehicles, but the double salient pole structure of the switched reluctance motor causes serious nonlinear characteristics of its phase inductance, It makes the torque ripple more serious when it is working, which limits its application in high-performance occasions. Among the control methods for reducing torque ripple, it can be divided into direct torque control and current control methods according to whether the torque is directly controlled. The direct torque control method refers to the decoupling control method of the asynchronous motor, but it cannot fundamentally solve the large torque ripple during the commutation process. For the traditional torque distribution method, a double closed-loop control structure is used, and the outer loop is the speed loop, the inner loop is the current loop, but the control performance of the double closed-loop control method is very limited in suppressing torque ripple

Images