【作者】 吕兴兵；

【导师】 胡念苏；

【作者基本信息】 武汉大学 ， 热能工程， 2005， 硕士

【摘要】 随着大型火电厂安全生产和自动化水平要求的不断提高,厂用应急柴油发电机组自启动成功率低、启动速度慢等问题越来越受到关注。 可编程控制器(PLC)是近年来工业控制中应用广泛的主要控制技术之一,其具有软硬件设计方便、体积小、可靠性高、耗电量低、持续工作时间长等诸多优点,十分适合电厂恶劣工作环境和要求。 本文主要研究了以可编程控制器(PLC)为核心的控制技术来实现应急柴油发电机组的监控自动化。主要是通过提高监控系统的准确性、灵活性来提高应急机组的可靠性,包括降低设备的故障率、提高应急机组自启动成功率和启动速度等。 文章重点介绍了研究开发的具有双机联合监控和自动并机功能的新型远程监控系统。该系统突破了传统的“一机一套”模式,在两台应急柴油发电机组间增加连接硬件和调节装置,通过PLC控制模块发出指令实现紧急情况下顺序启动功能和双机并车功能,从根本上提高了机组的应急能力。 本文首先介绍了课题研究背景及主要任务。 第二章详细介绍了火电厂应急保安电源发展现状。 第三章介绍了本文研究的火电厂应急保安电源控制系统优化策略选择。 第四章详细地介绍了系统的设计与实现,主要包括控制思想的确定、硬件设备选型、控制软件选择及控制模块的编制等。 第五章是全文总结和相关技术的展望,介绍了新型系统实际运用情况和进一步需要完善的地方。更多还原

【Abstract】 With the developing demand for automation in large-scale coal power plant, the problems with self-starting and starting speed in security Diesel-motor Unit are studied more and more.Programmable Logic Controller technology is one of the most widely practical control techniques in recent years. It has many advantages, such as convenient selections of hardware’s, small solidity, high reliability and long consecutive working time. And these fit the difficult working circumstance and high demand perfect in coal power plant.Our research concentrates on the control automation in security Diesel-motor Unit that makes use of Programmable Logic Controller technology. We succeeded in promoting accuracy and flexibility to enhance the reliability of control system.This paper emphasizes on introducing our new remote monitoring system, which has the function of united-monitoring and automatic joint-operation between two Diesel-motor Unit.This paper firstly introduces the research background and tasks.In the second chapter, we introduce the nowadays development of security Diesel-motor Unit in coal power plant.In the third chapter, we introduce the control strategies in our new monitoring system.In the forth chapter, we introduce the structure and flowchart of PLC and introduce Particularly the Siemens S7-200 PLC and characteristics of new control system.The last chapter, we summarize the article and prospect technology correlatively.更多还原