Sediment deposition model of grading electrode in water cooling circuit of HVDC converter valve

Song, Xiping; Cheng, Yijie; Gao, Bing; Yang, Fan; He, Tingting; Jia, Ru

doi:10.1049/joe.2018.8922

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…In addition, any electrical potential imbalance between metal components of the cooling circuit, such as the heat sink body and pipe fittings, leads to chemical reactions on the metals. Therefore, in order to reduce the electrolytic currents flowing in the cooling medium, techniques such as limitation of the coolant's electrical conductivity via a chemical filter placed in a bypass parallel to the main circuit [13], minimization of the hydraulic diameter of the piping system [14] and placement of grading electrodes at predefined locations [15], should be employed. In addition, due to deionized water's aggressiveness irrespectively of whether current is flowing through it, the system should be pressurized so as the free oxygen content is limited.…”

Section: Current Technologies For Thermal Managementmentioning

confidence: 99%

Thermal Management System for Press-Pack IGBT Based on Liquid Metal Coolant

Yerasimou

Pickert

Dai

et al. 2020

IEEE Trans. Compon., Packag. Manufact. Technol.

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The press-pack packaging technology has been adopted in recent years for insulated-gate bipolar transistors (IGBTs) to be utilized in high voltage -high current applications, such as high-voltage direct current (HVDC) electric power transmission. Traditionally, the heat management of such systems is based on water coolant, however, there are numerous challenges associated with that method, such as the requirement to deionize the water to prevent electrical potentials and inherent problems of corrosion and leakage in the cooling piping structure. This paper presents the design and development of a liquid metal heat sink for press-pack IGBTs. The use of a thermal management system based on liquid metal increases the heat dissipation capability without corroding the cooling structure. Analytical work is performed on the design of the heat sink. Moreover, the thermal performance of the heat sink is experimentally validated against a commercial water-based cooling system. The presented results show that the cooling performance of the liquid metal system is increased, whereas the shortcomings of the water-based system are eliminated. Index Terms-Press-pack insulated-gate bipolar transistor (IGBT) power module cooling, junction temperature, liquid metal cooling, magnetohydrodynamic (MHD) pump, high-voltage direct current (HVDC) cooling.

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Section: Current Technologies For Thermal Managementmentioning

confidence: 99%

Thermal Management System for Press-Pack IGBT Based on Liquid Metal Coolant

Yerasimou

Pickert

Dai

et al. 2020

IEEE Trans. Compon., Packag. Manufact. Technol.

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“…Wang et al [4] investigated the mechanism of sediment deposition on grading electrodes in cooling water dielectric of high voltage (HV) converter valve and the method of suppression. Song et al [5] proposed an electrochemical diffusion coupling model to study the sediment deposition behaviour on the electrode surface. The results indicated that the maximum sediment thickness and…”

Section: Introductionmentioning

confidence: 99%

Hybrid Entropy in the Time-Frequency Domain for Grading Electrode Sediment Identification

et al. 2022

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The traditional manual periodic screening method of grading electrode sediments is prone to cause the equipment failure of high voltage direct current converter valves. Therefore, we propose to use ultrasonic time-domain reflection method to detect the sediments. However, the ultrasonic echo signals are characterized by nonlinearity and nonsmoothness, which makes it very difficult to extract effective features for sediment detection. To address this issue, we propose an intelligent detection method based on multiscale hybrid entropy characteristics in the time-frequency domain. First, a multiscale decomposition of the signal is performed. Second, the weighted form factor index is proposed to select the noise modes. Moreover, we propose to calculate the hybrid entropy in the time-frequency domain of each mode as the characteristic input bidirectional long and short-term memory network model, and verified that feature enhancement can be achieved by noise modes noise reduction. Finally, the experimental validation shows that the proposed method can achieve nondestructive testing and intelligent identification of graded electrode sediment with a correct identification rate of 94.25%.

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Research on the Mechanism of Sediment Formation of Al Compounds on Platinum Electrodes in Inner Water Cooling Systems for HVDC Converter Valves

Yang¹

2021

International Journal of Electrochemical Science

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Sediment deposition model of grading electrode in water cooling circuit of HVDC converter valve

Cited by 4 publications

References 5 publications

Thermal Management System for Press-Pack IGBT Based on Liquid Metal Coolant

Thermal Management System for Press-Pack IGBT Based on Liquid Metal Coolant

Hybrid Entropy in the Time-Frequency Domain for Grading Electrode Sediment Identification

Research on the Mechanism of Sediment Formation of Al Compounds on Platinum Electrodes in Inner Water Cooling Systems for HVDC Converter Valves

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