EPE Association: EPE 2011 - LS6e: Topic 05: Failure Tolerant Systems or Converters

EPE 2011 - LS6e: Topic 05: Failure Tolerant Systems or Converters
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2011 ECCE Europe - Conference > EPE 2011 - Topic 05: Hard Switching Inverters and Control > EPE 2011 - LS6e: Topic 05: Failure Tolerant Systems or Converters

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   DESIGN OF A 12-PULSE CYCLOCONVERTER WITH FAULT-TOLERANCE CAPABILITY
By Victor GUERRERO, Jorge PONTT [View]
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Abstract: In modern high power industrial processes, multipulse cycloconverters are fundamental to feed synchronous motors. Given the importance of these critical processes, especially for mining industry, the reliability of the high power drive is critical. Having a fault-tolerant cycloconverter is quite valuable and it will reduce the economic losses caused by long repair times of the converter. Currently it is difficult and in some cases almost impossible to determine which of the 72 SCRs experiences an over-current or those which do not trigger properly causing a malfunction. In this paper, we present a new fault detection method applied to a 12 pulse cycloconverter in way to develop a converter with the remarkable fault-tolerance capability.

   Failure Tolerant Operation and Trimming Principle of the CLIC Main Linac
By Daniel SIEMASZKO, Serge PITTET [View]
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Abstract: A powering strategy for a high number of magnets disposed in a radiated and confined area is presentedfor a particle accelerator application. One power converter supplies the main current in series connectedmagnets. Then, for adjusting each current individually, small active trimmers are implemented togetherwhich each magnet. The trimmers are only dissipative, implemented as MOSFETs operated in theirlinear region and controlled by analog PI controllers. The reliability of the whole powering system isensured with failure tolerance that complies with beam physics. The steady state operation and dynamicresponse in case of failures are experimentally studied in a reduced scale prototype.

   Fault tolerant operation of power converters with cascaded cells
By Frans DIJKHUIZEN, Staffan NORRGA [View]
[Download]

Abstract: Multilevel converters based on cascaded cells are well suited for high power applications, due to good control performance, extensive modularity and excellent harmonic distortion. A vital requirement in high power converters is being fault-tolerant, so that a single fault in a cell does not lead to the trip of the entire converter. This paper presents a strategy for fault-tolerance on cell level with Integrated Gate Commutated Thyristors (IGCT). The concept is based on initiating a surge in a phase leg in a failing cell, limited by a di/dt reactor leading to a short circuit failure mode of the IGCT thereby excluding the cell from the chain.

EPE 2011 - LS6e: Topic 05: Failure Tolerant Systems or Converters
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2011 ECCE Europe - Conference > EPE 2011 - Topic 05: Hard Switching Inverters and Control > EPE 2011 - LS6e: Topic 05: Failure Tolerant Systems or Converters
	[return to parent folder]

	DESIGN OF A 12-PULSE CYCLOCONVERTER WITH FAULT-TOLERANCE CAPABILITY By Victor GUERRERO, Jorge PONTT	[View] [Download]
Abstract: In modern high power industrial processes, multipulse cycloconverters are fundamental to feed synchronous motors. Given the importance of these critical processes, especially for mining industry, the reliability of the high power drive is critical. Having a fault-tolerant cycloconverter is quite valuable and it will reduce the economic losses caused by long repair times of the converter. Currently it is difficult and in some cases almost impossible to determine which of the 72 SCRs experiences an over-current or those which do not trigger properly causing a malfunction. In this paper, we present a new fault detection method applied to a 12 pulse cycloconverter in way to develop a converter with the remarkable fault-tolerance capability.

	Failure Tolerant Operation and Trimming Principle of the CLIC Main Linac By Daniel SIEMASZKO, Serge PITTET	[View] [Download]
Abstract: A powering strategy for a high number of magnets disposed in a radiated and confined area is presentedfor a particle accelerator application. One power converter supplies the main current in series connectedmagnets. Then, for adjusting each current individually, small active trimmers are implemented togetherwhich each magnet. The trimmers are only dissipative, implemented as MOSFETs operated in theirlinear region and controlled by analog PI controllers. The reliability of the whole powering system isensured with failure tolerance that complies with beam physics. The steady state operation and dynamicresponse in case of failures are experimentally studied in a reduced scale prototype.

	Fault tolerant operation of power converters with cascaded cells By Frans DIJKHUIZEN, Staffan NORRGA	[View] [Download]
Abstract: Multilevel converters based on cascaded cells are well suited for high power applications, due to good control performance, extensive modularity and excellent harmonic distortion. A vital requirement in high power converters is being fault-tolerant, so that a single fault in a cell does not lead to the trip of the entire converter. This paper presents a strategy for fault-tolerance on cell level with Integrated Gate Commutated Thyristors (IGCT). The concept is based on initiating a surge in a phase leg in a failing cell, limited by a di/dt reactor leading to a short circuit failure mode of the IGCT thereby excluding the cell from the chain.