基于多种相关分析的汽包水位波动因素及控制优化  

Factors and control optimization of drum water level fluctuation based on multiple correlation analysis

作　　者：陈刚 范常浩 易秉恒 倪向红 胡勇[3] CHEN Gang;FAN Changhao;YI BingHeng;WENG Wenlin;NI Xianghong;HU Yong(China Energy Nanjing Electric Power Test&Research Limited,Nanjing 210023,China;CHN ENERGY(Quanzhou)Thermal Power CO.,LTD,Quanzhou 362804,China;School of Control and Computer Engineering North China Electric Power University,Beijing 100085)

机构地区：[1]国能南京电力试验研究有限公司,江苏南京210023 [2]国能(泉州)热电有限公司,福建泉州362804 [3]华北电力大学控制与计算机工程学院,北京100085

出　　处：《电力科技与环保》2023年第4期353-360,共8页Electric Power Technology and Environmental Protection

基　　金：国家自然科学基金重点项目“工业炉窑燃烧场重构及能效优化控制”(61833011)。

摘　　要：锅炉汽包水位的调整直接关系到整个机组的运行安全,由于其具有多变性、非线性以及强耦合等特性,使得汽包水位的优化调整成为众多学者和研究人员不断关注的重点。针对某300 MW热电联产机组汽包水位波动大的问题,通过分析汽包水位控制系统工艺流程,明确影响汽包水位调节的各个因素,包括机组功率、汽轮机调门开度、给水流量、供热抽汽流量、一、二级过热器减温水流量、再热器减温水流量,采用机理分析法得出过热蒸汽流量qhs与汽机侧主蒸汽流量qms之间的关系方程,初步判断影响汽包水位波动的关键因素为过热器减温水流量qsh;其次提出基于惯性滤波器分解的多尺度相关分析方法,将汽包水位按相对频率大小分解为低频、中频、高频三个尺度,再计算不同尺度信号的相关系数,最终判断出汽包水位与过热器减温水流量具有强相关性。通过机理分析法和多尺度相关分析法得到的结果相互印证,进而得出过热器减温水流量qsh是汽包水位波动主要影响因素。最后,以该热电联产机组为应用平台,根据分析出的关键影响因素设计并优化原有控制逻辑,优化后汽包水位波动量小于±15 mm,相较于优化前波动幅度减小70%,极大改善了汽包水位控制系统的调节品质,优化效果证明采用的方法对现场信号的波动分析和控制优化具有实际意义,也为同类型机组汽包水位的优化调整提供借鉴。The adjustment of boiler drum water level is directly related to the operational safety of the entire unit.Due to its characteristics of variability,nonlinearity,and strong coupling,the optimization and adjustment of drum water level has become a focus of continuous attention for many scholars and researchers.In response to the problem of large fluctuations in the water level of the steam drum of a 300MW cogeneration unit,the process flow of the steam drum water level control system is analyzed to clarify the various factors that affect the adjustment of the steam drum water level,including unit power,turbine control valve opening,feedwater flow,heating and extraction flow,desuperheating water flow of primary and secondary superheaters,and desuperheating water flow of reheaters.The mechanism analysis method is used to obtain the relationship between the superheated steam flow rate and the main steam flow rate on the turbine side.It is preliminarily determined that the key factor affecting the fluctuation of the steam drum water level is the superheater desuperheating water flow rate;Secondly,a multi-scale correlation analysis method based on inertial filter decomposition is proposed,which decomposes the steam drum water level into three scales based on relative frequency:low frequency,medium frequency,and high frequency.Then,the correlation coefficients of signals at different scales are calculated,and it is finally determined that the steam drum water level has a strong correlation with the superheater desuperheating water flow rate.The results obtained through mechanism analysis and multi-scale correlation analysis mutually confirm that the flow rate of superheater desuperheating water qsh is the main influencing factor of drum water level fluctuation.Finally,using the cogeneration unit as the application platform,the original control logic was designed and optimized based on the key influencing factors analyzed.After optimization,the fluctuation of the steam drum water level was less than±15mm,which decreased

关 键 词：汽包水位 多尺度分解 相关分析 控制优化 

分 类 号：TK229.6[动力工程及工程热物理—动力机械及工程] TM621.2[电气工程—电力系统及自动化]