220MW机组DEH系统VP卡故障分析及应对措施

Analysis and countermeasures of VP card fault in DEH system of 220MW unit

DCS控制系统为西屋公司的OVATION分散控制系统,OVATION分散控制系统通过VP卡控制大机调节门。设备运行中突然出现#1机组连通管调节阀CV1、CV2连通杆阀门突然失控,从开度100%至0%来回快速摆动,中调门失控,低压缸进气突变,影响机组稳定运行。针对这一情况,从原理上进行分析,探讨技术方案,为类似问题的解决提供技术参考和借鉴。

The control system is the Ovation Distributing Control System of Western Road. Suddenly # 1 units of the unit are suddenly occurring in the equipment operation, the CV2 connecting rod valve suddenly out of control, rapid swing from the opening degree of 100% to 0%, the medium-regulated door is out of control, the low pressure cylinder intake, affecting the stable operation of the unit. In this case, the technical solution is discussed in principle, discusing technical programs, providing technical reference and reference for similar problems.