预测及限制型协调控制系统优化设计  

Optimization design of predictive and restricted coordinated control system

作　　者：李珂 刘永红 LI Ke;LIU Yonghong(Datang Northwest Electric Power Test&Research Institute,Xi’an 710065,China)

机构地区：[1]大唐西北电力试验研究院,陕西西安710065

出　　处：《热力发电》2020年第11期159-163,共5页Thermal Power Generation

摘　　要：为了解决深度调峰工况下,火电机组由于变负荷频次和变负荷幅度增加以及频繁启停磨煤机组造成的主蒸汽压力波动剧烈的问题,本文提出一种预测型锅炉主控前馈及三级限制型总风量前馈构成的协调控制优化逻辑,采用基于启磨煤机预判的预加煤前馈控制、总风量设定值逻辑优化、三级限制下总风量前馈逻辑优化等策略,提高机组变负荷响应能力,达到总风量与高频变化燃料量的最优匹配。在某600 MW机组上采用该优化策略,并通过现场变负荷扰动试验分析机组在高频率及大幅度负荷变动、启停磨煤机组、燃料量波动等复杂工况下主蒸汽压力变化特性,试验表明该优化方法能够综合调控机组主蒸汽压力,保障机组在经济工况下稳定运行。Due to the increase of frequency and amplitude of variable load and the frequent start and stop of coal mills,the main steam pressure of thermal power units fluctuates violently.To solve this problem,a coordinated control optimization logic,consisting of predictive boiler master feed forward and three-stage restricted total air flow,is proposed.This logic adopts several strategies such as the pre-addition coal feed forward control logic based on coal mill start-up prediction,the logic optimization of the total air volume setting value,and the logic optimization of the total air volume feed forward under three-level limit,thus to better respond to the load changes and well match the total volume of air with the amount of fuel changing at high frequencies.Moreover,this optimization strategy is applied in a 600 MW unit,and the variation characteristics of the unit main steam pressure under complex conditions are analyzed through on-site variable load disturbance test,the conditions include high frequency and large-amplitude load variation,start and stop coal mills,and fuel quantity fluctuation.The test shows that this optimization method can comprehensively regulate the unit main steam pressure and ensure the stable operation of the unit under economic conditions.

关 键 词：预测型 锅炉主控前馈 三级限制 总风量前馈 协调控制系统 主蒸汽压力 

分 类 号：TK323[动力工程及工程热物理—热能工程]