Direct Torque Control in a Traction Electric Drive Equipped with a Permanent Magnet Motor on the Basis of Spatial-Vector Modulation
Abstract
The article presents a solution for implementing direct torque control of a traction electric motor excited from permanent magnets, which is based on using spatial-vector modulation. The modified direct torque control arrangement is adopted as the strategy for control of a three-phase bridge inverter. The circuit contains a bidirectional DC voltage converter, which makes it possible to control the on-board network voltage and match the storage battery charging mode during recuperative braking. The distinctive feature of the presented modified circuit arrangement is that the relay-based regulators, which are commonly used for producing the spatial-vector modulation signals, are replaced by digital PI controllers of torque and voltage. The results from simulating the modified circuit are presented and analyzed, and the effectiveness of the proposed system for use in a traction electric drive is shown. The dynamic modes simulation results confirm that the proposed electric drive structure can be successfully used as a traction drive of electric transport vehicles and has acceptable indicators of transient and steady-state operation modes. The simulation results have demonstrated that the proposed traction electric drive can meet the requirements of the electric transport vehicle municipal driving cycle.
References
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