【作者】 蔡静；

【导师】 曹惠玲；

【作者基本信息】 河北工业大学 ， 热能工程， 2002， 硕士

【摘要】 本文对可控硅整流电路采用蒸发冷却方式进行了理论分析和实验研究。可控硅整流电路中的主要部件是大功率硅整流器，大功率硅整流器是一种以晶闸管为主的电力电子器件，晶闸管是可控硅整流电路中最主要的发热元件，因此，文章主要针对晶闸管的散热问题展开研究。晶闸管作为一种电力电子器件，在强电领域有着极为广泛的应用，迄今为止，在直流输电、无功补偿等方面仍占据举足轻重的地位。晶闸管属于大功率的半导体器件，决定其允许通过电流大小的标准之一是温度的高低。因此，研究晶闸管的散热问题有着重要的意义。 文章首先介绍了蒸发冷却技术的广泛应用，列举了近几十年蒸发冷却技术在电气设备降温方面取得的成就，从而可以看出这种新型的电气设备冷却方式的良好发展前景。然后详细阐述了制冷剂的选用原则，通过对以往电气设备常用的制冷剂及新合成的制冷剂进行分析比较，根据不同制冷剂的特点，针对晶闸管在可控硅整流电路中的工作特点，暂选氟里昂R113为本文实验用冷却介质。 文章在对晶闸管传统冷却方式深入透彻理解的基础上，从理论上分析了可控硅整流电路采用蒸发冷却技术的可行性以及引入调压系统的可行性和必要性，进而又进行了实验研究。从晶闸管相对于环境的表面温升和晶闸管与环境间的热阻两方面入手，证明了可控硅整流电路采用蒸发冷却方式是可行的，通过与其它散热方式相应参数的比较，验证了这种冷却方式的优越性，再一次证明了蒸发冷却是大功率电气设备降温的最好途径。更多还原

【Abstract】 The paper studied the evaporative cooling system of SCR commute circuit in theory and experiments. The main component in the commute circuit is controlled silicon rectifier. The controlled silicon rectifier is a kind of electric and electron component and the mostly component of it is thyristor. During the working, thyristor will produce a great quantity of heat. So, the central problem of this article is cooling. As an electric and electron component, the application field of thyristor is very wide. To these days, in the fields of direct current transfer, reactive power compensator, etc, thyristor still play an important role. Thyristor is a high-power semiconductor device, and the standard of its rated current is temperature. So, the study of cooling is a matter of great significance.Firstly, the article stated the wide application of evaporative cooling technology. Enumerated some achievement on the application of large electrical equipment in resent years. From these, we’ll found the excellent future of evaporative cooling technology. Secondly, discussed the selection of coolants. By comparing the different character of coolants, which used on the electrical equipments and newly developed ones, and analyzing the cooling condition in commute circuit, Rl 13 was chosen for the research.Thirdly, the article analyzed the impossibility of the evaporative cooling system of commute circuit and the importance of presser regulation system. After that, the evaporative cooling commute circuit system was build-up. The temperature of thyristor and the thermal resistant between thyristor and air was calculated. The corresponding parameter was compared in different cooling system. At last, we’ll find the cooling effect of evaporative cooling system is excellent. Evaporative cooling is the best cooling style for large electncal equipment.更多还原