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Three-phase

About: Three-phase is a research topic. Over the lifetime, 16801 publications have been published within this topic receiving 159477 citations.


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Patent
04 Aug 2010
TL;DR: In this paper, a method for charging and starting a three-phase modular multilevel inverter in a self-excitation way under the condition of no need of an auxiliary DC power supply was proposed.
Abstract: The invention discloses a method for charging and starting a three-phase modular multilevel inverter in a self-excitation way under the condition of no need of an auxiliary DC power supply In the method, by adopting interphase currents generated by line voltages of an AC system among converter bridge arms, the process of charging capacitors of all the submodules on the bridge arms is completed by controlling switching on and switching off an upper electronic power switch and a lower electronic power switch in the submodules of all the bridge arms when current directions of the bridge arms and capacitor voltages of all the submodules are detected; and all the bridge arms can be simultaneously charged, so that the three-phase modular multilevel inverter can be quickly and normally started in the self-excitation way

45 citations

Proceedings ArticleDOI
17 Jun 2001
TL;DR: In this paper, a theoretical and experimental analysis of the voltage stress on the power semiconductors employed in a bridge leg of a unidirectional three-phase three-level PWM (VIENNA) rectifier is given.
Abstract: In this paper a theoretical and experimental analysis of the voltage stress on the power semiconductors employed in a bridge leg of a unidirectional three-phase three-level PWM (VIENNA) rectifier is given. Furthermore, a new turn-on snubber is proposed which does improve the rectifier efficiency by 0.3% as verified by an experimental analysis and a detailed loss breakdown.

45 citations

Patent
04 Jun 1975
TL;DR: In this article, the phase sequence of the phase currents supplied by a three-phase AC power supply to a phase-sensitive load (such as a threephase AC motor) is monitored by developing three phase-displaced, rectangular shaped logic signals, respectively representing the three phase currents, and applying these logic signals to respective ones of the J, C and K inputs of a J-K flip-flop.
Abstract: The phase sequence of the phase currents supplied by a three-phase AC power supply to a phase-sensitive load (such as a three-phase AC motor) is monitored by developing three phase-displaced, rectangular shaped logic signals, respectively representing the three phase currents, and applying these logic signals to respective ones of the J, C and K inputs of a J-K flip-flop. When the load is correctly connected to the power supply, the phase relationship of the three logic signals will be appropriate to trigger the flip-flop to its set operating state. Any other sequence actuates the flip-flop to its reset state which, in turn, disconnects the load from the power supply.

45 citations

Patent
01 Oct 1993
TL;DR: In this article, a power conversion system for driving a three phase synchronous or induction motor receives power from AC power lines and rectifies the power to provide DC current on DC link lines through a link inductor.
Abstract: A power conversion system for driving a three phase synchronous or induction motor receives power from AC power lines and rectifies the power to provide DC current on DC link lines through a link inductor. An inverter connected to the DC link lines is composed of three sets of two thyristors connected in series across the DC link lines. Three output lines extend from connections between each of the three sets of thyristors to the motor. Capacitors are connected across each of the three phase output lines. A controller controls the switching of the thyristors in two modes. In a first mode, used from start-up to low speed operation, a high frequency switching cycle is produced in three steps during which pairs of thyristors in different ones of the three sets are triggered. The relative length of time spent in each one of the three periods during the switching cycle is varied to obtain a desired change in the average output voltage on the three phase output lines at a fundamental frequency. The first mode provides power to drive the motor between standstill and an intermediate speed, with the phase voltages being controlled so that commutation of the thyristors is obtained during each switching cycle. While operating at any speed in the first mode, the system can transfer to a second mode having a four step switching cycle to generate a fundamental voltage component on the three phase output lines by changing the switching cycle in a six step sequence. The motor can be driven in the second mode to a desired speed, while control of the torque is obtained.

44 citations

Proceedings ArticleDOI
15 Oct 2007
TL;DR: A three-port three-phase bidirectional DC-DC converter suitable for high-power applications that combines a slow primary source and a fast storage to power a common load (e.g., an inverter) and is based on conventionally and coaxially wound structures.
Abstract: This paper proposes a three-port three-phase bidirectional DC-DC converter suitable for high-power applications. The converter combines a slow primary source and a fast storage to power a common load (e.g., an inverter). Since this type of system is gaining popularity in sustainable energy generation systems and electrical vehicles, the proposed topology is of practical interest The proposed converter consists of three high-frequency inverter stages operating in a six-step mode, and a high-frequency three-port three-phase symmetrical transformer. The converter provides galvanic isolation and supports bidirectional power flow for all the three ports. An arbitrary power flow profile in the system can be achieved by phase shifting the three inverter stages. Thanks to the three-phase structure, the current handling capability of the circuit is larger and the ripple currents at the dc sides are much lower owing to the interleaving effect of the three- phase, and thus the VA rating of the filter capacitors is much lower. The operating principle and, in particular, the transformer design which is based on conventionally and coaxially wound structures are presented. Circuit simulation results are included to verify the proposed converter topology and the dual-PI-loop control strategy.

44 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023111
2022291
2021475
2020826
20191,037
20181,103