Proceedings ArticleDOI
Five-level GTO inverters for large induction motor drives
R.W. Menzies,P. Steimer,J.K. Steinke +2 more
- Vol. 30, Iss: 4, pp 938-944
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TLDR
It is shown that a combination of several PWM techniques offers the best solution for the drives application and that large induction motors with ratings up to 22 MVA, 7.46 kV may be supplied by the five-level inverter using presently available 4.5 kV, 3.0 kA GTO thyristors.Abstract:
The development of large induction motor drives with low torque ripple and fast dynamic response for new or retrofit applications has been limited by the device ratings and problems of series connections. This paper investigates the use of a five-level GTO voltage-sourced inverter for large induction motor drives. The advantages of such a drive are that single GTO thyristors may be used at each level, thereby avoiding the need for series connection of the thyristors. The thyristors are well protected from overvoltages by the clamping action of the DC supply capacitors. The disadvantages are that each DC level requires a separate supply, four in the case of the five-level inverter, and that the devices are not equally loaded. This paper reviews the basic operation of the five-level inverter and possible PWM voltage/frequency control techniques for the specific application of induction motor drives. The simulation results clearly show the unequal loading of the devices and the need for independent voltage supplies for the five levels. It is shown that a combination of several PWM techniques offers the best solution for the drives application. The conclusions indicate that large induction motors with ratings up to 22 MVA, 7.46 kV may be supplied by the five-level inverter using available 4.5 kV, 3.0 kA GTO thyristors. The recommended supply for such an inverter with full regenerative operation over the complete speed range is four, four-quadrant converters in a quasi-24-pulse configuration. >read more
Citations
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Proceedings ArticleDOI
Multilevel PWM methods at low modulation indices
TL;DR: Some novel multilevel PWM strategies to take advantage of the multiple levels in both a diode-clamped inverter and a cascaded H-bridge inverter by utilizing all of the levels in the inverter even at low modulation indices are proposed.
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A Universal Selective Harmonic Elimination Method for High-Power Inverters
TL;DR: In this article, the authors further developed harmonics injection and equal area criteria-based four-equation method to realize OPWM for two-level inverters and multilevel inverters with unbalanced dc sources.
Book ChapterDOI
Multilevel Power Converters
Leon M. Tolbert,Xiaojie Shi +1 more
TL;DR: In this paper, the fundamental multilevel converter structures and modulation paradigms are discussed, including cascaded H-bridges, diode clamp, flying capacitors, and modular MMCs.
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DC bus voltage balancing and control in multilevel inverters
Thomas A. Lipo,Gautam Sinha +1 more
TL;DR: In this article, a multilevel inverter system with four or more levels of output voltage on each inverter output line is described, where the switching of the switching devices is controlled to provide a selected output voltage waveform utilizing redundant switching states, when such states are available on each voltage transition.
Journal ArticleDOI
A four level rectifier inverter system for drive applications
G. Sinha,Thomas A. Lipo +1 more
TL;DR: Control issues involved in a four-level inverter based AC drive application are addressed and the DC capacitor voltages are balanced for both motoring and regenerating modes of the inverter-motor system.
References
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TL;DR: In this article, a generalization of the Pulse Width Modulation (PWM) subharmonic method for controlling single-phase or three-phase multilevel voltage source inverters (VSIs) is considered.
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Proceedings Article
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TL;DR: In this article, a pulsewidth modulation (PWM) method for the control of a three-level inverter is described, which works with a constant carrier frequency not synchronized with fundamental stator frequency.
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Switching frequency optimal PWM control of a three-level inverter
TL;DR: In this article, a switching frequency optimal PWM method (SFO-PWM) was proposed for the control of a three-level inverter with a DC-link neutral point not stabilized from the power input converter.
Proceedings ArticleDOI
Control strategy for a three phase AC traction drive with three-level GTO PWM inverter
TL;DR: A control strategy developed for two-level inverters is applied to the three-level gate-turn-off PWM inverter, resulting in results from computer simulation for a traction motor with 1400 kW nominal power.