SFC在分子筛纯化系统切换控制中的应用

针对分子筛纯化系统切换控制的特点,结合横河CETUM CS3000控制系统中的顺序控制功能,介绍了SFC在分子筛纯化系统切换控制中的应用,以及一些组态经验和维护措施。     

Power system stabilization by switching-over control of transmission lines

New technologies such as synchronized switching and power electronics will make it possible to change the configuration of a transmission network in future electric power systems. It is called VIPS (Variable Impedance Power System) by the authors who have been studying the effects of those technologies on power system stabilities. This paper considers the improvement of transient stability by means of switching-over control of transmission lines. It is clear that in some power systems, the simultaneous energization of the line de-energized in the normal state with the fault clearing better improves first-swing stability than the pre- and post-fault energization of the line. The energy function-based index to select such a transmission line is derived. In addition, this paper shows that multiple switching of a transmission line improves damping of post-fault conditions, where minimization of time derivative of energy functions is used. The switching-over control is applied to multimachine power systems and its effectiveness is demonstrated.     

分子筛纯化系统切换阀门的故障判断及处理

空分设备分子筛纯化系统中的切换阀门出现故障会造成整套空分设备停运,实际操作中,保持分子筛纯化系统切换阀门的可靠、稳定运行很重要。简介40000 m3/h空分设备分子筛纯化系统切换阀门的技术参数,分析运行过程中阀门无法动作和动作卡阻故障的原因。阐述切换阀门故障时的应急处理措施、国产化替代阀门的工艺参数和进口阀门的修复过程。