Online Monitoring Technology of Thyristor Level of HVDC Converter Valve

doi:10.3969/j.issn.1000－7229.2016.10.009

Abstract

Abstract: Currently there are up to 29 HVDC transmission projects in operation or under construction in China, which are playing an important role in power grid. The converter valve is the core unit of HVDC transmission, whose performance largely influences the reliability of HVDC transmission project. This paper firstly analyzes the principles and shortages of existing monitoring technologies of HVDC converter valve. Then, this paper proposes a real-time online monitoring method for the parameters of thyristor-level damping circuit and DC grading circuit, and improves the self-check of thyristor trigger and monitoring unit (TTM). Finally, this paper verifies the effectiveness of the proposed monitoring method through simulation and experiment. As a result the annual preventive maintenance of converter valve is replaced by condition based maintenance, which can realize the maintenance free of converter valve in operation and improve the equipment's availability and reliability.

Key words: converter valve, thyristor trigger and monitoring unit (TTM), valve base electronics(VBE), on-line monitoring, condition based maintenance, reliability

CLC Number:

TM 407

WANG Huafeng, WEI Xiaoguang,ZHENG Lin,HAO Changcheng,ZHANG Haifeng,LIN Zhiguang. Online Monitoring Technology of Thyristor Level of HVDC Converter Valve[J]. Electric Power Construction, 2016, 37(10): 61-.

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