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
Parallel-connected five-level PWM inverters
TL;DR: In this paper, two modulation strategies have been devised and designed in order to improve the harmonic characteristics of the parallel-connected five-level PWM inverter, and it is found that the DC current flow through the DC power supplies can be controlled by means of phase shifting of the injected third order harmonics.
Journal ArticleDOI
Switching Angles and DC Link Voltages Optimization for Multilevel Cascade Inverters
Qin Jiang,Thomas A. Lipo +1 more
TL;DR: In this paper, the optimization of both DC link voltages and switching angles of fundamental switching strategy for the output waveform of a multilevel cascade inverter is investigated, where the switching angle at each voltage level is optimized so that the resulting staircase output voltage has the minimum harmonic content.
Proceedings ArticleDOI
A five-level inverter voltage space phasor generation for an open-end winding induction motor drive
TL;DR: In this paper, a topology for voltage space phasor generation equivalent to a 5-level inverter for an open-end winding induction motor is presented, which is fed from both ends by two 3 level inverters.
Proceedings ArticleDOI
A control strategy for a five-level double converter with adjustable DC link voltage
TL;DR: This paper proposes a control strategy of a three-phase five-level double converter for induction motor drives that will redress the imbalance of the generated losses at switching devices in the five- level inverter and reduce thegenerated losses.
Proceedings ArticleDOI
Switching angles and DC link voltages optimization for multilevel cascade inverters
Qin Jiang,Thomas A. Lipo +1 more
TL;DR: In this paper, the optimization of both DC link voltages and switching angles of the output waveform from a multilevel cascade inverter is investigated and substantial improvement can be obtained.
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.