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This text aims to solve such problems as the large pulsation of battery electric locomotive traction motor torque at low speed, the unpredictable frequency spectrum of the torque, and the large frequency and wastage of high-speed inverter switching. Starting from space voltage vector, this text adopts the method of multiple vector synthesis and mutual switch control of motor air-gap flux according...
A new space vector modulation (SVM) technique having a full and independent control of the multiple voltage space vectors of a six-phase voltage source inverter is presented in this paper. The proposed space vector approach is based on three-phase decomposition, leading to the modulation of two three-phase VSIs. The six-phase load consists in a dual three-phase induction motor, with insulated neutral...
This paper presents the implementation of a previously proposed model predictive direct torque control (MPDTC) algorithm for the control of three-phase induction motor drives comprising a three-level DC-link inverter. The MPDTC scheme is designed to keep the motor torque and stator flux and the inverter neutral point potential within given hysteresis bounds while reducing the switching frequency of...
The paper highlights the increased instability of the induction motor due to the nonlinearity introduced by the voltage inverter, nonlinearity produced by the dead time required for switching devices on the same phase. Voltage errors on phase and between phases against the load null are presented, as well as the fact that phase voltage error against load null is in phase with the current. This permits...
A novel sensorless control for switched reluctance motor (SRM) driven by the three-phase full-bridge inverter is proposed. The most commonly used drive for SRM is the asymmetric half-bridge inverter but its main disadvantage is the cost due to the number of switches and diodes required to realized the drive, in comparison with the much cheaper and more widely available three-phase full-bridge inverter...
This paper presents a novel DC link voltage feedforward control to improve the electric drive system tolerance capability to the dc link voltage sag. A uniform mathematic model, comprising the battery packs, voltage source inverter (VSI), permanent magnet synchronous motor (PMSM) is built up in the d-q rotating coordinates rather in three-phase stationary coordinates. In order to study the influence...
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