【作者】 陈国华；

【导师】 邵克勇；

【作者基本信息】 大庆石油学院 ， 控制工程， 2008， 硕士

【摘要】 当今世界,生产力的不断发展使各行各业以及人们的日常生活对电能的需求量越来越大,促使电力企业不断腾飞和发展。越来越多的高参数、大容量火力发电机组逐步投入运行,对相应的控制系统的性能提出了愈来愈高的要求。在这种大环境下,以计算机技术为核心,具有快速响应调节特性的的数字电液调节系统受到重视,并且逐渐从大机组向中小型机组推广。本文以某热电厂#2汽轮机调节系统为例,对机械液压调节(MHG)系统和数字电液调节(DEH)系统在硬件构成、工作原理、控制功能等方面的优缺点进行了分析,并从火力发电厂热工专业的角度出发,在系统调节性能和保安控制性能两个方面,将DEH系统与传统的MHG系统进行了对比。通过对比分析,可以看出,DEH系统控制逻辑灵活而丰富,控制功能更为强大,调节和保安控制性能都较MHG系统有了极大的改善。本文针对DEH系统中存在的调速汽门失控、LVDT故障、OPC保护误动作、转速检测信号受干扰等问题进行了研究,并设计出改进措施,解决了上述问题,可供应用同类型DEH系统的电厂参考。更多还原

【Abstract】 Nowadays,with the continuing growth of the forces of social production, the requirement to electric energy in all trades and in daily life is larger and larger, which urges the electric power enterprises to develop rapidly and continuously. More and more thermoelectric generating sets which have high parameter and big capability run into operation gradually,which demands the higher characteristic of corresponding control systems. Under this big environment,the digital electro-hydraulic control system (DEH), which has fast response adjust characteristic and is composed of nuclear computer technology, is being paid great attention, and is promoted gradually from big sets to medium and small sets.Take the case of the control system of the second turbine in one thermal power station, the thesis analyses the advantages and disadvantages of the hardware composing, basic principle and control performance in the conventional mechanical-hydraulic governor(MHG)and the digital electro-hydraulic control system(DEH)in particular. At the same time, the thesis analyses the DEH system contrasted with the MHG system from the Instrument and Control angle of the thermal power plant, with two aspects including the and the security control characteristic. Through the analysis, we know that the control logic of the DEH system is agility and abundance, the control function is more powerful, the adjustment and security control capability is improved extremely contrast with the MHG system.The thesis study the disadvantages of losing control of the intercept steam valve, LVDT faults, the OPC protection’s misplay, rotate speed signal jamming in the DEH system. At the same time, the author devises the improving project resolving the disadvantages to power plants with the same DEH system for reference.更多还原