摘要
控制系统中的电源系统是电厂控制系统中的一个非常重要的系统,是电厂分散控制系统能够长期稳定运行的基础。对于运行中的机组来说,分散控制系统的控制器如果发生失电故障往往会引起比较严重的后果。为了保证电厂的安全稳定运行,对电厂的分散控制系统制定应急预案,针对分散控制系统的失电情况采取相应的应对措施非常重要。本文针对某电厂三期工程DCS在调试和运行过程中出现的种种问题,结合OVATION控制系统的特点,介绍了某电厂三期DCS控制器失电事故预想,目的之一是掌握执行机构失去控制信号后的动作特性,二是检查软件设置和联锁保护设计是否有优化的空间,三是为异常处理和恢复提供参考。
Power system is a very important system in the control system, which is the basis of the smoothly running of control system. The result is very serious if the power system of the control system is poweroff. The article describes the pre-caution of DCS controller on the loss of power supply of power plant according to the problems arising from the commissioning and running of the project. The purpose of this article can be summarized as below： 1 learning the character of the actuator when its control signal is losed;2 checking out if it is available for the optimizing of the software setting and protecting design;3 providing the reference for the dealing and restoring of trouble.
