Design Optimization of Converter Valve Thyristor for New Generation of ±800 kV/8 GW UHVDC Project

doi:10.12204/j.issn.1000-7229.2020.06.015

Abstract

Abstract: The new generation of standardized ±800 kV/8 GW UHVDC transmission projects puts forward the higher requirement on performance and reliability of thyristors used in converter valves. The performance requirements of converter valve equipment are analyzed. Then the optimization objectives of performance parameter of thyristor products are determined. On the basis of the research and development of thyristors in past projects， the optimization design and process improvement methods are studied in order to further improve current performance， reduce on-state voltage drop， improve dynamic parameter consistency and safety margin. For the new generation of standardized ±800 kV/8 GW UHVDC transmission project， two kinds of domestic 8.5 kV/5 500 A thyristors were designed and their performance characteristics were compared by special tests. The research and test results show that after the optimization design， lower on-state voltage drop and better current performance of the two thyristor products are realized， and the dynamic parameter consistency and safety margin is further improved. The two thyristor products can meet the requirements of the new generation of standardized UHVDC project.

Key words: UHVDC, converter valve, thyristor, optimization design, performance improvement, special test

CLC Number:

TM 402

YANG Yong， SHE Zhenqiu， SONG Shengli， LI Ming，WANG Jialong，FAN Jichao. Design Optimization of Converter Valve Thyristor for New Generation of ±800 kV/8 GW UHVDC Project[J]. Electric Power Construction, 2020, 41(6): 114-122.

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