Model predictive flux linkage control-based direct torque control method for switched reluctance motor

A switched reluctance motor, direct torque control technology, applied in the control of generators, control of electromechanical brakes, control of electromechanical transmissions, etc., can solve the problems of change lag, error, large torque ripple, etc., to reduce torque The effect of pulsation, elimination of first-order delay, and reduction of computational effort
CN109347389AActive Publication Date: 2019-02-15DALIAN MARITIME UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DALIAN MARITIME UNIVERSITY
Publication Date
2019-02-15

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Abstract

The invention provides a model predictive flux linkage control-based direct torque control method for a switched reluctance motor. The direct torque control method at least comprises the following steps of measuring a current of a stator, a rotating speed of a rotor, a position of the rotor and a voltage of a direct-current link through sensors; calculating flux linkage of the stator and a torqueof a motor at a K moment; through a hysteresis ring controlled by the torque, comparing a torque value at the current K moment with a torque value set by a PI ring, and selecting out three to-be-selected voltage vectors; substituting the to-be-selected voltage vectors into a second-order Runge-Kutta method formula to predict the current of the stator at the K+1 moment; predicting a flux linkage value of the stator at the K+1 moment through the current of the stator at the K+1 moment; comparing a predicted flux linkage value psi k+1 of the stator at the K+1 moment with a given flux linkage value psi ref; selecting a Uk+1 voltage vector for minimizing an evaluation function through the evaluation function; sending a switch signal corresponding to the selected optimal voltage vector to a three-phase asymmetric bridge converter; and performing control on the switched reluctance motor.
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Description

technical field

[0001] The invention relates to the technical field of torque control of switched reluctance motors, in particular to a direct torque control method of switched reluctance motors based on model predictive flux linkage control. Background technique

[0002] The switched reluctance motor (Switched Reluctance Motor, SRM or SR motor) was first proposed in the 1940s. Due to the technical conditions at that time, it was not well developed. However, after the 1960s, with the development of power electronic devices, SRM motors have also begun to be valued by the academic community. SRM has attracted widespread attention from academia and industry due to its advantages such as simple structure, low cost, high efficiency, and good speed regulation performance, and the number of papers and patents related to it has grown rapidly. Our country began to study SRM from about 1985. The products cover textiles, electric vehicles, home appliances, mining machinery, petroleu...

Claims

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