Determination method of air volume to meet cooling requirements of UHV DC ice-melting device

Abstract

The invention discloses a method for determining the air volume that satisfies the cooling requirements of an UHV DC ice-melting device, which includes preliminary selection of the number of power devices connected in series with each rectifier bridge arm during rated operation; calculation of the ideal no-load DC voltage; and calculation of the input side voltage; Calculate the voltage reserve coefficient of the power device; adjust the number of power devices according to the voltage reserve coefficient; carry out the voltage equalization design of the power device; calculate the conduction loss of the power device; calculate the damping circuit loss of the power device; calculate the rated current of each rectifier bridge arm The total loss; calculate the total loss of the UHV DC ice-melting device to obtain the calorific value of the device. The method of the present invention is clear and practical. By calculating the voltage reserve coefficient of the power device, the number of power devices is optimally selected under the premise of ensuring the safety of the withstand voltage, so as to avoid the increase in cost and the increase in calorific value caused by excessive selection; through quantitative calculation of the device The total loss can be used to obtain the calorific value of the device, guide the design of the cooling system, consider comprehensively, calculate accurately, and avoid over-design.

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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