Air quantity determining method of meeting cooling requirements of extra-high voltage direct-current thawing device

Abstract

The invention discloses an air quantity determining method of meeting cooling requirements of an extra-high voltage direct-current thawing device. The method comprises the following steps: preliminarily selecting the number of power devices which are connected with each rectifier bridge arm in series in a rated operation; calculating ideal no-load direct current voltage; calculating input side voltage; calculating voltage storage coefficients of the power devices; adjusting the number of the power devices according to the voltage storage coefficients; carrying out voltage-sharing designs of the power devices; calculating conduction losses of the power devices; calculating damping loop losses of the power devices; calculating total losses of each rectifier bridge arm in rated current; and calculating the total losses of the extra-high voltage direct-current thawing device to obtain a calorific value of the device. The method disclosed by the invention is specific and high in practicability; the number of the power devices is optimally selected under the premise of ensuring the pressure-resistant safety by calculating the voltage storage coefficients of the power devices; the cost increase and the calorific value increase caused by excessive selection are avoided; the calorific value of the device is obtained by quantitatively calculating the total losses of the devices; a design of a heat-removal system is guided; the air quantity determining method is comprehensive to consider and accurate to calculate; and an over design is avoided.

Description

technical field [0001] The present invention specifically relates to a method for determining the air volume that meets the cooling requirements of an UHV DC ice-melting device. Background technique [0002] At present, the icing and icing process of transmission lines has always been a research hotspot in icing, icing, and deicing of power networks. At present, the deicing methods of transmission lines generally include current deicing, short circuit deicing, direct current deicing and so on. [0003] UHV DC deicing has become an ideal means of deicing transmission lines due to its high deicing efficiency and low deicing power. The UHV DC ice-melting device provides an effective ice-melting means for the UHV transmission line to deal with ice disasters. However, due to the high output voltage and large current of the UHV DC ice-melting device, multiple power devices need to be connected in series to solve the withstand voltage problem. The ice current is large, and with t...

AI Technical Summary

Problems solved by technology

Existing design methods are extremely dependent on the experience of designers, there is no method to follow, the design process is simple and rough, without theoretical demonstration, often leading to design errors or design difficulties

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