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
Sine-triangle versus space-vector modulation for three-level PWM voltage-source inverters
TL;DR: In this paper, the inherent relations between sine-triangle and space-vector pulsewidth modulation schemes for three-level voltage-source inverters were studied and it was shown that the two schemes can function equivalently through proper selection of common-mode injections in the case of sine triangle modulation, or dwell times in equivalent redundant switching states in a space vector modulation scheme.
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Analysis and Control of DC-Capacitor-Voltage-Drift Phenomenon of a Passive Front-End Five-Level Converter
TL;DR: In this paper, the authors proposed a space vector modulation (SVM) based switching strategy to counteract the voltage-drift phenomenon of a front-end five-level DCC, which operates based on a sinusoidal pulsewidth modulation (SPWM) switching strategy.
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Yen-Shin Lai,Fu-San Shyu +1 more
TL;DR: In this article, a new topology for a hybrid multilevel inverter is presented, which significantly increases the level number of the output waveform and thereby dramatically reduces the low-order harmonics and total harmonic distortion.
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Voltage balancing control of diode-clamped multilevel rectifier/inverter systems
TL;DR: A new voltage balancing control for the diode-clamped multilevel rectifier/inverter system that regulates the DC bus voltage, balances the capacitors, and decreases the harmonic components of the voltage and current is presented.
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A magnetic-less DC-DC converter for dual voltage automotive systems
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References
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Journal ArticleDOI
A new multilevel PWM method: a theoretical analysis
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.
Journal ArticleDOI
Generalized Structure of a Multilevel PWM Inverter
TL;DR: In this article, a generalized structure of a multilevel voltage source thyristor inverter is proposed to decrease the harmonic distortion in the output waveform without decreasing the inverter power output.
Proceedings Article
Switching frequency optimal PWM control of a three-level inverter
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.
Journal ArticleDOI
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.