A method for predicting the thickness of a uniform piezoelectric electrode scale layer of a converter valve based on an electrode reaction

Abstract

The invention discloses a method for predicting the thickness of a uniform piezoelectric electrode scale layer of a converter valve based on an electrode reaction. In order to solve the electrochemical corrosion and overheating problems caused by the fouling of homogeneous piezoelectric electrodes in the current water cooling system of converter valves, the technical scheme adopted by the invention is as follows: according to the internal cooling system structure of the valve section of the converter valve which is cooled by the parallel water circuit adopted by the converter station, the physical model structure of the water channel electrode reaction of the valve section is determined, and according to the operation condition, the calculation model of the water channel electrode reactionof the valve section is further established; the initial values and boundary conditions of electrode potential and deionized water potential are set by using the geometrical parameters of water channel, water quality parameters of deionized water and the working voltage value of converter valve when it is running. The electrode reaction model is constructed. The electrode fouling thickness is calculated. The present invention is advantageous to further acquiring the fouling data of the homogeneous piezoelectric electrode in the operation process of the converter valve, grasping the electrodefouling rule, timely replacing the homogeneous piezoelectric electrode of the converter valve, and providing powerful theoretical and technical support for guaranteeing the safe and stable operation of the converter station.

Description

technical field [0001] The invention relates to a cooling system of equipment in a high-voltage direct current transmission system, in particular to a method for predicting the scale layer thickness of a pressure-equalizing electrode in a valve cooling system based on a nonlinear electrode reaction. Background technique [0002] The converter valve is the key equipment of the HVDC transmission system, and the valve cooling system is the weak point of the converter valve. More than 25% of the converter valve failures are caused by the valve cooling system. The diverter valve will generate a lot of heat during the working process, and the valve cooling system will take away the heat through the circulating cooling water, so that the diverter valve can work normally. Due to the different potentials of the metal components in the converter valve, the direct contact between the cooling water and the metal components will generate leakage current between the metal components, resu...

AI Technical Summary

Problems solved by technology

Severe fouling of the electrode will cause the scaling layer to fall off, further causing the blockage of the cooling water pipe and the outage of the converter station

[0003] At present, the domestic method to solve the fouling of the voltage equalizing electrode is regular maintenance and cleaning, but the scale layer will still fall off when using this method, resulting in the blockage of the cooling water pipe and the shutdown of the converter station, and this method requires the shutdown of the converter station. Cause certain economic losses, but also need to invest a lot of manpower and material resources

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