一种新型基础控制器在过热汽温串级控制系统中的运用

Application of a New Foundation Controller in Superheated Steam Temperature Cascade Control System

在火电机组中,过热汽温既影响安全性,又影响经济性,因此过热汽温控制系统需要对过热汽温具有良好的控制能力。然而,过热汽温控制对象具有长惯性、长迟延特性,再加上减温器喷水后汽温测点位置选择不合适、减温水调节门性能差等原因,造成某些机组对过热汽温的控制能力较差。本文介绍了一种新型基础控制器(New Foundation Controller,NFC),分析了以NFC为基础的汽温串级控制系统的原理结构,并通过建立控制对象的工程模型来整定NFC参数。投运结果表明,这种新型基础控制器满足汽温自调系统长期投入的条件,达到了汽温串级控制系统改造的预期目的。

In thermal power units,the superheated steam temperature affects both safety and economy,therefore,the superheated steam temperature control system needs to have a good control ability on the superheated steam temperature.However,the superheated steam temperature control object has the characteristics of long inertia and long delay,coupled with the improper selection of the position of the steam temperature measurement point after the desuperheater sprays water,and the poor performance of the desuperheating water regulating valve,which causes some units to control the superheated steam temperature Poor ability.This paper introduced a new foundation controller(NFC),analyzed the principle structure of the NFC-based steam temperature cascade control system,and tuned the NFC parameters by establishing an engineering model of the control object.The commissioning results show that the NFC meets the long-term investment conditions of the steam temperature self-adjusting system,and achieves the expected purpose of the steam temperature cascade control system transformation.