火电机组凝结水节流系统优化控制及一次调频性能分析  

Optimization control of condensate throttling system in thermal power units and analysis of primary frequency regulation performance

作　　者：杨成帅 房方[1] 何成兵[2] YANG Chengshuai;FANG Fang;HE Chengbing(School of Control and Computer Engineering,North China Electric Power University,Beijing 102206,China;School of Energy,Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学控制与计算机工程学院,北京102206 [2]华北电力大学能源动力与机械工程学院,北京102206

出　　处：《热力发电》2025年第3期108-120,共13页Thermal Power Generation

基　　金：国家重点研发计划项目(2022YFB4100400)。

摘　　要：常规蒸汽调节阀主要承担功率调节任务,同时兼顾小范围的一次调频,凝结水节流可在一定程度上改变机组的能量分布,是一种有潜力、可供选择的辅助调频手段。为深入探究凝结水节流的调频能力,剖析了其工作原理及优势,建立了凝结水节流系统的静、动态模型,分析了调频特性,并给出了调频边界条件。为综合提高凝结水节流一次调频性能,将系统动态模型进行线性化,进而设计了一种基于模型切换的模糊预测控制策略:在预测控制算法中引入模糊逻辑,实时修正控制加权系数,根据工况变化,动态切换预测模型以提升控制品质。基于某600 MW机组的实际数据开展算例分析,结果表明:凝结水节流静、动态调频能力随着机组负荷升高而提升,具有一次调频工程应用价值;与传统PID和模糊参数自整定PID控制器相比,在不同工况下,所提出的控制策略的调节时间和性能指标均较优异,对于工况变化具有较好的适应性。The conventional steam valve predominantly manages power regulation tasks while also addresses limited-scale primary frequency regulation.Condensate throttling can change energy distribution of the unit to a certain extent,and serve as a potential and selectable auxiliary frequency regulation method.To delve deeper into the frequency regulation capability of condensate throttling,the working principle and advantages are dissected,and static and dynamic models of the condensate throttling system are established,the frequency regulation characteristics are analyzed and the frequency modulation boundary conditions are outlined.To comprehensively enhance the dynamic performance of the condensate throttling primary frequency regulation,the system dynamic model is linearized,and then a model-switching fuzzy predictive control strategy is proposed.In this control strategy,fuzzy logic is introduced into the predictive controller algorithm to dynamically adjust control weighting coefficients in real-time,and predictive models are dynamically switched according to operational changes to enhance control quality.Case studies based on actual data from a certain 600 MW unit are conducted,indicating the static and dynamic frequency modulation capabilities of condensate throttling increase with the unit load,which has engineering application value in primary frequency regulation.Compared with the conventional PID and self-tuning fuzzy parameter PID controllers,the proposed control strategy exhibits superior adjustment time and performance metrics under various operating conditions,demonstrating better adaptability to changes in operating conditions.

关 键 词：火电机组 一次调频 凝结水节流 模型切换 模糊预测控制 

分 类 号：TM6[电气工程—电力系统及自动化]