EPE Association: EPE 1997 – 74: Dialogue Session DS8b: HVDC

EPE 1997 – 74: Dialogue Session DS8b: HVDC
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   THYRISTOR-CONVERTERS FOR CONNECTING 16 2/3 Hz AND 50 Hz SYSTEMS
By N. Christl; H. Huang [View]
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Abstract: Thyristor-converter conventionally used for HVDC transmission is an interesting alternative to the GTO-converters for linking 16 2/3 Hz rails system with 50 Hz power system. The basic design concept for the thyristor converter is discussed and described in this paper.

   INTERACTIONS BETWEEN AC AND DC TRANSMISSION SYSTEMS: MODELLING FOR USE IN POWER SYSTEM STUDIES
By B. Delfino; G. B. Denegri; M. Invemizzi; A. Morini [View]
[Download]

Abstract: Multiterminal HVDC transmission systems require accurate modelling procedures within power flow and transient stability programs. AC and DC systems, as well as converter equipments are here represented to correctly simulate flow exchanges and perturbation effects. A step by step integration technique is also introduced to meet the different dynamic terms of the interconnected networks.

   EMERGENCY REPLACEMENT OF A 500 kV HVDC CONVERTER AT SYLMAR EAST
By W. Braun; W. Fähnrich; W. Fischer; K. Sadek [View]
[Download]

Abstract: The Pacific Intertie Expansion project was commissioned during 1988 with the objective of increasing the transmission capacity of a 136 km HVDC line that runs along the west coast of the United States between the Sylmar sub-station to the north of Los Angeles and the line's north em terminal at the Celilo Converter Station in the state of Oregon. The transmission capacity was up-graded from 2GW to 3.1GW by increasing the line current from 2000A to 3100A. This was achieved by connecting in parallel two 500kV, 12-pulse thyristor valve groups located at the Sylmar East converter station operated by the Los Angeles Department of Water & Power. Unfortunately, one of the new groups of thyristor valves was destroyed in a conflagration that occurred within a valve room in the converter building during October 1993. This left the utility with reduced capacity to serve one of the largest cities in the United States and as a result emergency plans had to be put in place to make up for the shortfall in the minimum time. The plan envisaged more than just replacing those components destroyed by the fire: the latest generation of thyristor valves were to be used and all tile associated assemblies and sub-systems be made more resistant to fire and more resilient to the effects of earth tremors. Moreover, many of the associated assemblies. and sub-systems of the other thyristor valve group were replaced to bring the whole converter station up to the same level of availability. This paper outlines the salient features that made the Sylmar East Converter Station safer and more reliable in just 13 months and so allowed the Los Angeles Department of Water & Power to regain the ability to fully exploit the Pacific Intertie for maximum economic benefit and supply more energy to one of the most power-hungry cities in the world.

EPE 1997 – 74: Dialogue Session DS8b: HVDC
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 74: Dialogue Session DS8b: HVDC
	[return to parent folder]

	THYRISTOR-CONVERTERS FOR CONNECTING 16 2/3 Hz AND 50 Hz SYSTEMS By N. Christl; H. Huang	[View] [Download]
Abstract: Thyristor-converter conventionally used for HVDC transmission is an interesting alternative to the GTO-converters for linking 16 2/3 Hz rails system with 50 Hz power system. The basic design concept for the thyristor converter is discussed and described in this paper.

	INTERACTIONS BETWEEN AC AND DC TRANSMISSION SYSTEMS: MODELLING FOR USE IN POWER SYSTEM STUDIES By B. Delfino; G. B. Denegri; M. Invemizzi; A. Morini	[View] [Download]
Abstract: Multiterminal HVDC transmission systems require accurate modelling procedures within power flow and transient stability programs. AC and DC systems, as well as converter equipments are here represented to correctly simulate flow exchanges and perturbation effects. A step by step integration technique is also introduced to meet the different dynamic terms of the interconnected networks.

	EMERGENCY REPLACEMENT OF A 500 kV HVDC CONVERTER AT SYLMAR EAST By W. Braun; W. Fähnrich; W. Fischer; K. Sadek	[View] [Download]
Abstract: The Pacific Intertie Expansion project was commissioned during 1988 with the objective of increasing the transmission capacity of a 136 km HVDC line that runs along the west coast of the United States between the Sylmar sub-station to the north of Los Angeles and the line's north em terminal at the Celilo Converter Station in the state of Oregon. The transmission capacity was up-graded from 2GW to 3.1GW by increasing the line current from 2000A to 3100A. This was achieved by connecting in parallel two 500kV, 12-pulse thyristor valve groups located at the Sylmar East converter station operated by the Los Angeles Department of Water & Power. Unfortunately, one of the new groups of thyristor valves was destroyed in a conflagration that occurred within a valve room in the converter building during October 1993. This left the utility with reduced capacity to serve one of the largest cities in the United States and as a result emergency plans had to be put in place to make up for the shortfall in the minimum time. The plan envisaged more than just replacing those components destroyed by the fire: the latest generation of thyristor valves were to be used and all tile associated assemblies and sub-systems be made more resistant to fire and more resilient to the effects of earth tremors. Moreover, many of the associated assemblies. and sub-systems of the other thyristor valve group were replaced to bring the whole converter station up to the same level of availability. This paper outlines the salient features that made the Sylmar East Converter Station safer and more reliable in just 13 months and so allowed the Los Angeles Department of Water & Power to regain the ability to fully exploit the Pacific Intertie for maximum economic benefit and supply more energy to one of the most power-hungry cities in the world.