A fault-tolerant predictive direct torque control method for dual motors in series

Abstract

The invention relates to a dual-motor series connection open-phase fault-tolerant predictive direct torque control method which is composed of an inverter, a T6 transformation module, a rotating coordinate transformation module, two motor flux linkage calculation modules, a prediction model module and an evaluation function module. According to information such as the current, the rotor position angle, and the rotating speed of the kth topology, predicting the power switch combination of the inverter of the (k+1)th topology from the loss function minimum angle in virtue a stator flux and electromagnetic torque prediction model. The dual-motor series connection open-phase fault-tolerant predictive direct torque control method realizes the mutual operation of decoupling of two open-phase motors, improves a series connection drive system open-phase fault-tolerant capability, realizes precise control of the electromagnetic torque and the stator flux linkage of the two motors, and greatly reduces the steady state pulsations of the electromagnetic torque and the stator flux of the two motors so that the two motors are more stable in steady operation.

Description

technical field [0001] The invention relates to a direct torque control method of double-motor series series phase loss tolerance fault tolerance prediction type. Background technique [0002] In a six-phase series-connected three-phase double permanent magnet synchronous motor drive system powered by a single six-phase inverter, the two motors are decoupled from each other, and the decoupling characteristics are obtained by relying on the connection between the windings of the two motors. That is, after the two-phase winding tails of the six-phase motor are electrically space-symmetrical in parallel, they are connected in series with the one-phase winding of the three-phase motor, so that the current of the three-phase winding is equally divided into the two-phase windings of the parallel six-phase motor. The current component that generates a symmetrical spatial rotating magnetic field in a six-phase motor does not flow through the three-phase windings; while the current o...

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Problems solved by technology

Obviously, the three-phase winding current has an adverse effect on the rotating magnetic field of the six-phase motor, how to maintain the torque decoupling control between the two motors is a difficult problem to be solved

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