【作者】 叶水环；

【导师】 王宣银；

【作者基本信息】 浙江大学 ， 机械电子工程， 2006， 硕士

【摘要】 集肤效应电伴热系统具有适用性强、安全可靠、安装维护简单、加热效率高、易于控制等特点，成为伴热系统的发展方向。目前的集肤效应电伴热系统大多采用的是工频电源，伴热系统恒功率输出，不因外界环境温度的变化而改变，负载温度的控制是通过开关控制来实现的。系统的可控性差，效率低。本文利用IGBT全桥逆变实现集肤效应电伴热控制，从理论和实验上研究其原理、设计方法、控制策略以及在长距离流体输送管道伴热应用中出现的问题，获得了较好的结果。 论文的主要内容如下： 第一章 介绍了电伴热的发展历史、应用领域及其分类，综述了国内外集肤效应电伴热的研究现状与意义，最后提出了本文的研究内容。 第二章 研究了集肤效应电伴热系统的原理和组成结构，分析了电磁场的集肤效应和邻近效应现象，并分别进行了有限元仿真计算。给出了集肤效应电伴热系统中的工程计算规则，提出一些应该注意的问题。最后设计了实验装置。 第三章 对系统的控制策略进行研究，创新性的把模糊控制技术应用于该系统中。对传统PID控制和模糊控制进行了仿真比较，针对仿真效果，提出对普通型模糊控制器进行改进，探索出模糊PID控制方法，通过仿真与实验，改善了此前基于传统控制方法的集肤效应电伴热系统的控制效果，获得了对该伴热系统更好的控制性能。 第四章 针对目前集肤效应电伴热系统依据单个传感器对整个伴热管线做决策所带来的弊端，创新性的提出采用多传感器进行联合决策的方法。针对原油在管道中输送的流变特性，总结出一套基于多传感器技术的长距离伴热管道温度控制策略。 第五章 介绍了实验部分的工作与结果。包括实验硬件，下位机(PLC)和上位机程序，实验数据以及结果分析。 第六章 对全文进行了总结，并对后续工作进行了展望。更多还原

【Abstract】 Skin effect tracing system is characterized by adjustability, safety and reliability, easy installation and maintenance, high efficiency of heating, easy control. It becomes the developmental direction of tracing system. The skin effect tracing system which is commonly used nowadays is on the basis of main frequency power. The output power of this kind of system is invariant no matter the external environment temperature changes. Besides, the control method of this kind of system is off-on control, the efficiency is low and the control effect is far from ideal. In this paper, the control of skin effect tracing system is realized by IGBT bridge inversion circuit. The theory, design method and control method is researched. On the side, this paper also brings forward a joint decision-making method based on multi-sensor technology. The research obtains a satisfactory result.The main research could be divided into several chapters, such as following:In chapter 1, the developing history and application area of electric tracing system is summarized. Then the advantage of Skin Effect Tracing System is analyzed. At last, the main contents and requirements for this research are proposed.In chapter 2, the structure and component of Skin Effect Tracing System are investigated. The phenomenon of Skin Effect and Proximity Effect is analyzed. Then the finite element analysis is carried out. At last, the design scheme of our experimental facility of Skin Effect Tracing System is introduced in detail.In chapter 3, the application of fuzzy logic control method in Skin Effect Tracing System is researched. The detailed process of the design method is given in this chapter. Then the classic PID control method and fuzzy logic control method are compared by emulation.In chapter 4, the problem which is caused by using only one temperature sensor in the long distance Skin Effect Tracing System is pointed out. Then a joint decision-making method based on multi-sensor technology in Skin Effect Tracing System is brought forwards.In chapter 5, the experiment of the research is summarized.In chapter 6, the research work is summarized and perspectives on the future are presented.更多还原