超临界机组燃料—汽压建模与控制研究
|
摘要
主蒸汽压力是表征超临界机组机炉能量供求关系的重要参数,其主要影响因素为燃料量。目前大部分火电厂燃料煤种杂、热值波动大,造成主蒸汽压力波动频繁,严重影响机组运行安全。在燃料量的控制系统中设计了燃料—汽压闭环自抗扰反馈控制回路,主要是借助扩张状态观测器估计出燃煤热值自发扰动,并在动态过程中将其实时补偿,提高入炉煤量的准确性,防止因燃煤热值波动造成主蒸汽压力的频繁波动。利用某660 MW超临界机组设计数据进行建模、计算与仿真,结果表明:与传统PID控制相比,自抗扰控制的抗干扰能力更强,对主蒸汽压力有更好的控制品质。
The main steam pressure is an important parameter which characterizes the energy supply and demand of supercritical boiler and steam turbine, which is affected largely by the mount of fuel. At present, most fuel coal of thermal power plant is complex, calorific value fluctuates, resulting in the frequent fluctuation of the main steam pressure, seriously affecting the safe operation of the unit. A fuel — main steam pressure ADRC closed loop feedback control loop was designed in the fuel control system, the spontaneous disturbance of coal-fired thermal value was estimated by ESO, which was then real time compensated in the dynamic process, the accuracy of the amount of coal into the furnace was improved, which kept the main steam pressure from fluctuating affected by coal-fired calorific value fluctuations. The design data of a 660 MW ultra—supercritical unit was used to model, compute and simulate, and the results of simulation show that, compared with traditional PID control, ADRC has stronger anti—interference ability and better control quality for main steam pressure.
The main steam pressure is an important parameter which characterizes the energy supply and demand of supercritical boiler and steam turbine, which is affected largely by the mount of fuel. At present, most fuel coal of thermal power plant is complex, calorific value fluctuates, resulting in the frequent fluctuation of the main steam pressure, seriously affecting the safe operation of the unit. A fuel — main steam pressure ADRC closed loop feedback control loop was designed in the fuel control system, the spontaneous disturbance of coal-fired thermal value was estimated by ESO, which was then real time compensated in the dynamic process, the accuracy of the amount of coal into the furnace was improved, which kept the main steam pressure from fluctuating affected by coal-fired calorific value fluctuations. The design data of a 660 MW ultra—supercritical unit was used to model, compute and simulate, and the results of simulation show that, compared with traditional PID control, ADRC has stronger anti—interference ability and better control quality for main steam pressure.
引文
[1]田亮,刘芳,刘鑫屏,等.高速率变负荷模式下火电机组协调控制系统参数优化[J].系统仿真学报,2015,27(7):1532-1540.(Tian Liang,Liu Fang,Liu Xinping,et al.Parameter Optimization on Coordinated Control System of Thermal Power Units in High Rate Variable Load Operation Mode[J].Journal of System Simulation(S1004-731X),2015,27(7):1532-1540.)
[2]刘友宽,潘巾杰,田沛,等.煤质自适应校正方案建模仿真[J].热力发电,2014,43(1):99-105.(Liu Youkuan,Pan Jinjie,Tian Pei,et al.Simulation of Coal Quality Correction Program[J].Thermal Power Generation,2014,43(1):99-105.)
[3]崔志强,刘吉臻.燃料-汽压系统锅炉蒸汽压力动态面控制[J].中国电机工程学报,2012,32(26):103-108.(Cui Zhiqiang,Liu Jizhen.Dynamic Surface Control for Boiler Steam Pressure of Fuel-steam Pressure System[J].Proceedings of the CSEE,2012,32(26):103-108.)
[4]杨景祺,戈黎红,凌荣生.超临界参数机组控制系统的特点及其控制策略[J].动力工程,2005,25(2):221-225.(Yang Jingqi,Ge Lihong,Ling Rongsheng.Features and Strategies for Control Systems of Supercritical Pressure Sets[J].Chinese Journal of Power Engineering,2005,25(2):221-225.)
[5]罗志浩,陈小强,陈波.超(超超)临界机组主重要参数控制策略优化[J].浙江电力,2011,30(6):32-35.(Luo Zhihao,Chen Xiaoqiang,Chen Bo.Optimization of Control Strategy of Main Parameters for Supercritical(Ultra Supercritical)Units[J].Zhejiang Electric Power,2011,30(6):32-35.)
[6]蒋欣军,王煜伟,周晓韡.新型串级热值校正技术在直流锅炉配煤掺烧中的应用[J].锅炉技术,2013,44(6):65-69.(Jiang Xinjun,Wang Yuwei,Zhou Xiaowei.Application of New Type BTU Control Technology for Blended Coal Combustion in Once-through Boiler[J].Boiler Technology,2013,44(6):65-69.)
[7]刘吉臻,刘焕章,常太华,等.部分烟气信息下的锅炉煤质分析模型[J].中国电机工程学报,2007,27(14):1-5.(Liu Jizhen,Liu Huanzhang,Chang Taihua,et al.Analysis Model of Coal Grade into Boilers Based on Incomplete Flue Gas Information[J].Proceedings of the CSEE,2007,27(14):1-5.)
[8]韩京清.自抗扰控制技术——估计补偿不确定因素的控制技术[M].北京:国防工业出版社,2008.(Han Jingqing.Active Disturbance Rejection Control-a Technique for Estimating the Uncertainty of Compensation[M].Beijing,China:National Defence Industry Press,2008.)
[9]Toshio Inoue,Haruhito Taniguchi,Yasuyuki Ikeguchi.A Model of Fossil Fueled Plant with Once-Through Boiler for Power System Frequency Simulation Studies[J].IEEE Transactions on Power Systems(S0885-8950),2000,15(4):1322-1328.
[2]刘友宽,潘巾杰,田沛,等.煤质自适应校正方案建模仿真[J].热力发电,2014,43(1):99-105.(Liu Youkuan,Pan Jinjie,Tian Pei,et al.Simulation of Coal Quality Correction Program[J].Thermal Power Generation,2014,43(1):99-105.)
[3]崔志强,刘吉臻.燃料-汽压系统锅炉蒸汽压力动态面控制[J].中国电机工程学报,2012,32(26):103-108.(Cui Zhiqiang,Liu Jizhen.Dynamic Surface Control for Boiler Steam Pressure of Fuel-steam Pressure System[J].Proceedings of the CSEE,2012,32(26):103-108.)
[4]杨景祺,戈黎红,凌荣生.超临界参数机组控制系统的特点及其控制策略[J].动力工程,2005,25(2):221-225.(Yang Jingqi,Ge Lihong,Ling Rongsheng.Features and Strategies for Control Systems of Supercritical Pressure Sets[J].Chinese Journal of Power Engineering,2005,25(2):221-225.)
[5]罗志浩,陈小强,陈波.超(超超)临界机组主重要参数控制策略优化[J].浙江电力,2011,30(6):32-35.(Luo Zhihao,Chen Xiaoqiang,Chen Bo.Optimization of Control Strategy of Main Parameters for Supercritical(Ultra Supercritical)Units[J].Zhejiang Electric Power,2011,30(6):32-35.)
[6]蒋欣军,王煜伟,周晓韡.新型串级热值校正技术在直流锅炉配煤掺烧中的应用[J].锅炉技术,2013,44(6):65-69.(Jiang Xinjun,Wang Yuwei,Zhou Xiaowei.Application of New Type BTU Control Technology for Blended Coal Combustion in Once-through Boiler[J].Boiler Technology,2013,44(6):65-69.)
[7]刘吉臻,刘焕章,常太华,等.部分烟气信息下的锅炉煤质分析模型[J].中国电机工程学报,2007,27(14):1-5.(Liu Jizhen,Liu Huanzhang,Chang Taihua,et al.Analysis Model of Coal Grade into Boilers Based on Incomplete Flue Gas Information[J].Proceedings of the CSEE,2007,27(14):1-5.)
[8]韩京清.自抗扰控制技术——估计补偿不确定因素的控制技术[M].北京:国防工业出版社,2008.(Han Jingqing.Active Disturbance Rejection Control-a Technique for Estimating the Uncertainty of Compensation[M].Beijing,China:National Defence Industry Press,2008.)
[9]Toshio Inoue,Haruhito Taniguchi,Yasuyuki Ikeguchi.A Model of Fossil Fueled Plant with Once-Through Boiler for Power System Frequency Simulation Studies[J].IEEE Transactions on Power Systems(S0885-8950),2000,15(4):1322-1328.