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
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
Three-phased multilevel inverter with identical step voltage levels for embedded systems
TL;DR: In this paper, a three-phase inverter with three identical step voltage levels and three identical voltage angles is proposed to reduce the total harmonic distortion in the output voltage and the power loss in the inverter.
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A fractal based space vector PWM scheme for general n- level inverters
G. Shiny,M. R. Baiju +1 more
TL;DR: A generalized pulse width modulation scheme to generate switching vectors for multilevel inverters based on fractal theory, using a modified normalization factor for the DC link so that PWM signals for any n -level inverter, including even levels, can be generated.
Proceedings ArticleDOI
Investigations into the performance of multilevel PWM methods at low modulation indices
Yen-Shin Lai,Fu-San Shyu +1 more
TL;DR: This paper investigates the performance of several multilevel PWM techniques for inverters, which include step modulation technique, selective harmonic elimination PWM (SHEPWM) method, and the presented virtual stage PWM technique, which is superior to other techniques for eliminating more low order harmonics and or having lower total harmonic distortion (THD).
Proceedings Article
PWM & PAM control strategy for five-level double converter
TL;DR: The PWM & PAM control strategy for the three-phase five-level double converter can reduce the generated losses at switching devices in the inverter circuit and the harmonic distortion of the inverters' output current waveform.
Proceedings Article
Voltage control and THD optimization for diode-clamped multilevel converter/inverter
TL;DR: This work presents a new voltage balancing theory for the diode-clamped multilevel converter/inverter system based on fundamental frequency switching control and extended to PWM control, which can extremely lower the harmonic components of the voltage.
References
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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
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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.
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.