单位时间内信号值变化幅度超限算法设计与应用

在工程实际应用中,经常需要设计单位时间内信号值变化幅度超限报警保护功能,而实际工程应用软件中没有可以直接调用的一种算法块实现该功能,技术人员需要调用工程应用软件中的延时算法块、高低比较算法块、脉冲计时块、加法块等算法块进行组合搭建组态逻辑,且设计出来的组态逻辑各不相同,影响组态效率和质量。该文给出了两种算法,实现单位时间内信号值变化幅度超限报警保护功能,并提供了火力发电厂DCS中实现汽轮机10分钟突降50℃报警保护的工程应用,尤其新算法设计方案2构思巧妙,在工程应用中组态简单,算法块较少,既能实现报警保护功能,又达到了节约控制器内存的效果。

Design and application of signal value variation amplitude extra-limit algorithm in unit time

In engineering practice,it is often necessary to realize the alarm protection function of signal value change range exceeding the limit in unit time.But since there is no edited algorithm block that can be directly invoked to realize this function in the actual engineering application software.To do this,technicians need to call the combination of fast delay algorithm,high and low comparison algorithm block,pulse timing block and addition block in engineering application software to build configuration logic.And the combination of configuration logic is not the same.Affects configuration efficiency and quality.The article provides two algorithms,which can realize the alarm protection function of signal value exceeding the limit in unit time.It also provides the engineering application of 50℃alarm protection for turbine sudden drop in 10 minutes in DCS of thermal power plant.In particular,the new algorithm design scheme 2 is ingenious.In engineering application,the configuration is simple and the algorithm block is less.It can not only realize alarm protection function,but also achieve the effect of saving controller memory.