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
Novel technique for maintaining balanced internal DC link voltages in diode clamped five-level inverters
C. Newton,Mark Sumner +1 more
TL;DR: In this paper, the authors considered the problem of providing four regulated DC sources for use in a diode clamped five-level inverter and proposed a new technique whereby the voltage across each of these capacitors is maintained constant using a switching circuit.
Journal ArticleDOI
A New DC-Voltage-Balancing Circuit Including a Single Coupled Inductor for a Five-Level Diode-Clamped PWM Inverter
Kazunori Hasegawa,Hirofumi Akagi +1 more
TL;DR: In this article, a dc-voltage balancing circuit for a five-level diode-clamped inverter intended for a mediumvoltage motor drive with a three-phase diode rectifier used as the front end is proposed.
Proceedings ArticleDOI
Elimination of harmonics in a multilevel converter using the theory of symmetric polynomials and resultants
TL;DR: In this paper, the switching angles in a multilevel converter were computed to produce the required fundamental voltage while at the same time not generating higher order harmonics, and it was shown that the theory of symmetric polynomials can be exploited to reduce the degree of the polynomial equations that must be solved.
Journal ArticleDOI
Reviews on multilevel converter and modulation techniques
TL;DR: In this article, the basic concept of four different types of multilevel converter: the neutral-point clamped, flying capacitor, cascaded H-bridge and modular is presented.
Journal ArticleDOI
Adjustable Proportional Hybrid SVPWM Strategy for Neutral-Point-Clamped Three-Level Inverters
TL;DR: This paper combines NTV2 with NTV, and the two methods are used alternately in a fundamental cycle and the proportional parameter can be selected to achieve a high-performance NP balance control and low switching frequency.
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.