Research Progress on Failure of Key Materials and Mitigation Measures for Cooling System of Flexible DC Converter Valve

doi:10.11902/1005.4537.2025.223

Journal of Chinese Society for Corrosion and protection

2026, Vol. 46

Issue (3): 653-662 DOI: 10.11902/1005.4537.2025.223

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Research Progress on Failure of Key Materials and Mitigation Measures for Cooling System of Flexible DC Converter Valve

WANG Yanfeng¹, WANG Liuhuo², SUN Shida¹, LIU Qi³, LI Yamei³, WANG Xianzong³(

)

^1.Grid Planning Research Center of Guangdong Power Grid Co. Ltd., Guangzhou 510600, China
^2.Infrastructure Department of Guangdong Power Grid Co. Ltd., Guangzhou 510600, China
^3.Xi'an XD Power Systems Co. Ltd., Xi'an 710065, China

Cite this article:

WANG Yanfeng, WANG Liuhuo, SUN Shida, LIU Qi, LI Yamei, WANG Xianzong. Research Progress on Failure of Key Materials and Mitigation Measures for Cooling System of Flexible DC Converter Valve. Journal of Chinese Society for Corrosion and protection, 2026, 46(3): 653-662.

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Abstract

The key material failure induced by leakage current in the water-cooling system of converter valves troubles the stable and secure operation of voltage source converter-high voltage direct current (VSC-HVDC) systems. From an interdisciplinary perspective integrating electrical engineering and materials science, this study systematically investigates typical failure phenomena encountered in actual operations, including corrosion of metal components, scaling on grading electrodes, and aging of sealing materials. It reveals the corrosion behavior of Al-radiators and stainless-steel pipelines under low-conductivity and high electric field conditions, and clarifies the migration-deposition mechanism of corrosion products leading to scaling. These findings may provide valuable reference for material design and corrosion protection in advanced power equipment.

Key words: VSC-HVDC transmission electrochemical corrosion erosion-corrosion aluminum radiator stainless steel grading electrode

Received: 14 July 2025 32134.14.1005.4537.2025.223

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(52471094)

Corresponding Authors: WANG Xianzong, E-mail: xianzong.wang@nwpu.edu.cn

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	WANG Yanfeng
	WANG Liuhuo
	SUN Shida
	LIU Qi
	LI Yamei
	WANG Xianzong

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https://www.jcscp.org/EN/10.11902/1005.4537.2025.223 OR https://www.jcscp.org/EN/Y2026/V46/I3/653

Fig.1 Generation mechanism of leakage current in VSC-HVDC converter valve cooling systems (a-c), current and scale deposition distribution around Pt electrode (d, e)^[13,22]

Fig.2 Distribution of current on interior surfaces of radiators (a), corrosion mechanisms of radiators induced by stray currents (b), current evolution on Al surfaces (c) and electrochemical corrosion typology of radiators under cathodic/anodic polarization (d)^[19-22]

Fig.3 Scaling phenomenon (a, b), and its scaling mechanism synergistically driven by electrodeposition-neutralization-adsorption (c)^[29~31]

Fig.4 Corrosion protection strategies for stainless steel pipelines: water quality regulation, optimization of electrode distribution, control of galvanic corrosion, and improvement of flow field structure

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