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In this paper, a novel remedial direct torque control (DTC) scheme is proposed for T type NPC (T- NPC) three-level asymmetric six-phase PMSM drives under open-phase faults. A simplified space vector modulation (SVM) is designed and applied for the DTC controlled asymmetric six-phase drive, in such a way that both good current harmonic performance and small DC link voltage fluctuation are available...
Open-end winding (OEW) three-phase drives with dual inverter configuration present high voltage gain, which is very valuable for electric vehicle (EV) applications. However, they can lead to zero-sequence currents and common mode voltages (CMV). A solution for the aforementioned problems is to control the inverters with only odd or even space vectors (SVs). Nonetheless, during dead-times the actual...
This paper presents a new space vector modulation (SVM) method for a three-phase five-leg indirect matrix converter (IMC) to drive a three-phase open-end winding load. The inverter stage of the new IMC topology is composed of five legs instead of the conventional six legs for the three-phase open-end winding load applications. The SVM method to drive the five-leg IMC is developed to operate the inverter...
The paper studies pulse width modulation (PWM) techniques for a five-phase multilevel open-end winding drive with two inverters supplied with unequal dc-link voltages, which are in the ratio 2:1. It is shown in the paper that application of in-phase disposition modulation (PD-PWM), often used in multiphase multilevel converters, results in overcharging of the capacitor in the dc-link of the converter...
Two-phase induction motor (TPIM) can be controlled using a 4-leg voltage source inverter (VSI) topology. A space vector based space vector pulse width modulation (SVM) is proposed in this paper for the 4-leg VSI by decomposing it into a dual single phase full-bridge VSIs. The switching algorithm is envisaged by exploiting the principles of SVM of three-phase VSIs. The implementation of the proposed...
This article consists of a collection of slides from the author's conference presentation. Some of the specific areas/topics discussed include: Motivation; Single-sided vs. dual inverter supply; and Multiphase multilevel supply topologies.
To improve the performance of an open winding interior permanent magnet synchronous motor (IPMSM) drive system, a space vector modulation based direct torque control (SVM DTC) strategy combined with Maximum Torque per Ampere (MTPA) concept is proposed in this paper. The MTPA trajectories are analyzed in rotor voltage frame, and then combined with SVM DTC in torque flux linkage frame. An imaginary...
This paper presents an isolated three-phase induction generator (IG) with fixed frequency and controllable output voltage using a three-phase four-switch Static Synchronous Compensator (STATCOM) with space vector modulation (SVM) switch technique. A squirrel-cage three-phase induction machine is used with two separate windings on the stator by a star connection. One of the machine three-phase windings...
Open-end winding variable speed drives with dual-inverter supply have been extensively investigated for various applications in the past, based on a three-phase machine configuration. This topology is relatively simple for practical realisation. It offers a higher number of switching states without the need for capacitor voltage balancing algorithms, when compared to the equivalent standard multi-level...
Open-end winding variable speed drives with dual-inverter supply have been extensively investigated for various applications, including series hybrid power-trains and propulsion motors. The topology is simple to realise while offering a higher number of switching states without the need for capacitor balancing algorithms, when compared to standard multi-level converters. The overwhelming majority...
Open-end winding variable speed drives with dual-inverter supply have been extensively investigated for various applications, including series hybrid powertrains and propulsion motors. The topology is simple to realise while offering a higher number of switching states without the need for capacitor balancing algorithms, when compared to standard multilevel converters. The existing body of work is...
A novel multi-phase multi-level ac motor drive is analyzed in this paper. The proposed scheme is based on four conventional 2-level three-phase voltage source inverters (VSIs) supplying the open-end windings of a dual three-phase motor (asymmetric six-phase machine), quadrupling the power capability of a single VSI with given voltage and current ratings. The proposed control algorithm is able to generate...
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