【作者】 杨帆；

【导师】 杜文莉； 刘洪新；

【作者基本信息】 华东理工大学 ， 控制工程， 2011， 硕士

【摘要】 随着电力系统的快速发展,电力系统运行的动态品质、安全稳定和经济性的改善已经成为电力系统运行的重要问题,发电机励磁系统是改善上述问题的最有效而又经济的手段之一。发电机励磁系统作为发电机重要组成部分,是提供发电机磁场电流的装置,在提高发电机静态稳定能力、提高发电机动态稳定能力、平息振荡、控制并联机组无功分配、维持发电机电压水平等方面起着非常重要的作用。过去,为了实现这些控制必须靠大量相应的硬件,这使得调节电路非常复杂,实现困难且可靠性低。近年来,微处理机技术发展迅猛,应用微处理机的自动励磁调节器更好地满足了励磁系统的复杂要求。本文以某公司3#汽轮发电机组的改造为背景,针对老机组中老式励磁系统无功摆动频繁,整流子环火、磨损严重,励磁调节及灭磁响应速度太慢,运行中故障较多等缺点,研究设计了汽轮发电机基于自并励励磁系统的改造方案。完成了自并励励磁系统励磁主回路、可控硅整流回路、灭磁回路的设计,讨论了励磁调节器控制方式,成功地对一台60MW汽轮发电机组进行了自并励励磁系统改造。通过比较论证了自并励励磁系统具有运行高可靠性,运行高稳定性,运行高经济性等优点。更多还原

【Abstract】 With the rapid development of electric power system, power system dynamic performance of the operation, security and stability and the improvement of the economy has become the important problem of power system operation, generator excitation system is one of to improve the most effective and economic means. Generator excitation system as an important component of the generator which is to provide generator of current device, magnetic field static stability ability, improve generator improve dynamic stability ability, calm generator oscillation, control of reactive power distribution condensing units, maintain generator voltage level, play a very important role In the past, control systems rely on a large number of relevant hardware, which is very complicated, difficult to realize and unreliable. Recently, the microprocessor technology have made a great progress and is embeded in the excitation regulators, which can meet the complex requirements better of the excitation system.This paper aimed at 3# turbo generator unit in power factory of Jilin petrochemical company, in which the old excitation system showed too many defects such as swinging frequently without work, badly worn of commentator, slow response of the adjustment, and many faults in its operation, etc. This paper focused on the reform design of turbo generator based on shunt self excitation system. It included the design of major loop, field flashing process and field suppression process of the shunt self excitation system. The control methods of the excitation regulator was also discussed. Industrial applications in 60 MW turbo generator demonstrated the above design is successful. After comparison, the shunt self excitation system have the advantages of higher reliability, stability improvement of Shaft generator, and economical efficiency.更多还原