Overview
ABSTRACT
This document describes the component and the theory of High Voltage Direct Current Line Commutated Convertors (HVDC-LCC) links. By using thyristors, these convertors can achieve a high power transfer at very high voltage but requires a minimum short-circuit level, absorb reactive power and generates harmonics. The first part of the article describes the main components of a HVDC LCC link and the second part is dedicated to the functionalities, characteristics, advantages and disadvantages of HVDC-LCC technology.
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Read the articleAUTHORS
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Yannick VERNAY : Expert power electronics and simulation engineer EMT Centre national expertise réseau - RTE - Campus Transfo, Jonage, France
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Sébastien DENNETIERE : Expert power electronics and simulation engineer EMT Centre national expertise réseau - RTE - Campus Transfo, Jonage, France
INTRODUCTION
A DC link consists of a DC line connecting at least two AC networks via converter stations. Two types of AC/DC converters are currently used in converter stations.
The first of these, which appeared in the 1970s to replace converters using mercury vapor valves, are thyristor converters. They are the subject of this article. These converters are available with high power and DC voltage (up to 12,000 MW and 1,100 kV in China with the Zhundong–Wannan link); their cost has stabilized and they have a good track record. They consume reactive power, generate harmonics, require good short-circuit power and are sensitive to AC voltage dips.
The second category, which emerged in 1997 from the variable-speed motor converter industry, are stand-alone converters known as "voltage sources".
The first part of this article describes the components making up thyristor converters. In the second part, it describes the functionalities, characteristics, advantages and disadvantages of this type of converter.
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KEYWORDS
high voltage | reactive power | power system | HVDC
Design and Operation of Thyristor-Based Converter Stations
Design of thyristor converter stations
Bibliography
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