模拟量输入信号变化速率保护的方法分析  

Analysis of Methods for Rate of Change Protection of Analog Input Signals

作　　者：刘斌 张明惠 Liu Bin;Zhang Minghui(Guodian Nanjing Automation Co.,Ltd.,Nanjing,jiangsu,China,210032;Nanjing SAC Valmet Automation Co.,Ltd.,Nanjing,jiangsu,China,210032)

机构地区：[1]国电南京自动化股份有限公司,江苏南京210032 [2]南京国电南自维美德自动化有限公司,江苏南京210032

出　　处：《仪器仪表用户》2024年第11期40-42,共3页Instrumentation

摘　　要：在分散控制系统(DCS)中,模拟量输入信号的突变可能引发误操作,因此对关键模拟量输入信号变化速率的监控至关重要。由于模拟量卡件的采集周期通常大于控制器逻辑计算周期,导致计算出的模拟量输入信号变化速率存在较大偏差。本文提出了两种方法解决此问题:一是在控制处理单元(CPU)中使用优化算法计算输入变化速率;二是在模拟量输入卡件中进行输入变化速率的计算和数据采集,然后将结果上传至CPU。这两种方法有效提高了速率保护逻辑的准确性,克服了采集周期与计算周期不一致的问题,从而显著增强了模拟量输入信号变化速率保护的可靠性。In Distributed Control Systems(DCS),abrupt changes in analog input signals can potentially trigger misoperations,highlighting the crucial importance of monitoring the rate of change(ROC)for critical analog input signals.However,the acquisition cycle of analog input modules often exceeds the logical calculation cycle of controllers,leading to significant deviations in the calculated ROC of analog input signals.This article proposes two methods to address this issue:firstly,employing an optimization algorithm within the Control Processing Unit(CPU)to calculate the ROC of inputs;secondly,performing ROC calculation and data acquisition within the analog input module,subsequently uploading the results to the CPU.Both approaches effectively enhance the accuracy of rate protection logic,overcoming the inconsistency between the acquisition cycle and calculation cycle,thereby significantly improving the reliability of ROC protection for analog input signals.

关 键 词：模拟量输入信号 变化速率保护 信号采集 逻辑计算周期 优化算法 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]