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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Journal ArticleDOI
A multilevel inverter system for an induction motor with open-end windings
TL;DR: The proposed inverter drive scheme is capable of producing a multilevel pulsewidth-modulation (PWM) waveform for the phase voltage ranging from a two- level waveform to a six-level waveform depending on the modulation range.
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Multilevel inverters for electric vehicle applications
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A 6.6-kV transformerless STATCOM based on a five-level diode-clamped PWM converter: system design and experimentation of a 200-V, 10-kVA laboratory model
TL;DR: In this paper, the potential of a transformerless STATic synchronous COMpensator (STATCOM) intended for installation on the 6.6-kV industrial and utility distribution systems is discussed.
Proceedings ArticleDOI
IGCT-a new emerging technology for high power, low cost inverters
TL;DR: In this article, the integrated gate-commutated thyristor (IGCT) was proposed for high-frequency applications with high-power diodes in the range of 0.5 MVA to 6 MVA and the inherent feasibility of series and parallel connection of the IGCT devices expands the power range up to several 100 MVA.
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A cascade multilevel inverter using a single DC source
TL;DR: In this paper, a cascade multilevel inverter can be implemented using only a single DC power source and capacitors, without requiring transformers, and it is shown that one can simultaneously maintain the voltage level of the capacitors and choose a fundamental frequency switching pattern to produce a nearly sinusoidal output.
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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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.