1000MW机组多变量协同优化一次调频
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摘要
为经济有效地提升深度调峰下火电机组一次调频响应能力,提出了一种多变量协同优化一次调频方案,该方案包括主蒸汽调节阀节流、凝结水变负荷、旁路给水调节以及调节附加抽汽等技术,通过变负荷特性试验对各项技术一次调频特性进行了详细分析,充分发挥了各项技术的优势及耦合增益,并成功应用于某超超临界1 000 MW机组。优化后该机组在一次调频响应能力不降低的基础上,主蒸汽调节阀的运行开度平均提高了5.3%,高压缸运行效率平均提高3.1%,折合供电煤耗降低约1.5 g/(kW·h),节能效果显著。该技术可应用于火电机组一次调频和自动发电控制(AGC)优化,以及提高机组灵活性等技术改造项目。
Aiming to effectively improve the responsiveness of primary frequency modulation of thermal power unit under deep peaking, the scheme of primary frequency modulation technology of multivariable co-optimization is carried out in this study. This scheme includes throttling of main steam regulating valve, condensed water throttling, bypassing feedwater regulation, additional extraction steam adjustment and other technologies. The characteristics of primary frequency modulation have been analyzed in detail through various variable load characteristics tests, which give full play to the advantages and coupling gains of various technologies and have been successfully applied in a 1 000 MW USC unit. On the base of maintaining the responsiveness of primary frequency modulation, the operation opening of main steam regulating valve and the operation efficiency of high pressure cylinder increase by 5.3% and 3.1% on average, equal coal consumption reduces about 1.5 g/(kW·h), which has considerable economic benefit. The multivariable co-optimization technology in this study can be applied to the optimization of primary frequency modulation and AGC of thermal power units and the technological transformation projects of improving the flexibility of thermal power unit.
Aiming to effectively improve the responsiveness of primary frequency modulation of thermal power unit under deep peaking, the scheme of primary frequency modulation technology of multivariable co-optimization is carried out in this study. This scheme includes throttling of main steam regulating valve, condensed water throttling, bypassing feedwater regulation, additional extraction steam adjustment and other technologies. The characteristics of primary frequency modulation have been analyzed in detail through various variable load characteristics tests, which give full play to the advantages and coupling gains of various technologies and have been successfully applied in a 1 000 MW USC unit. On the base of maintaining the responsiveness of primary frequency modulation, the operation opening of main steam regulating valve and the operation efficiency of high pressure cylinder increase by 5.3% and 3.1% on average, equal coal consumption reduces about 1.5 g/(kW·h), which has considerable economic benefit. The multivariable co-optimization technology in this study can be applied to the optimization of primary frequency modulation and AGC of thermal power units and the technological transformation projects of improving the flexibility of thermal power unit.
引文
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[19]樊印龙,张宝,顾正皓,等.节流配汽汽轮机组一次调频经济代价分析[J].中国电力,2016,49(7):86-89.FAN Yinlong,ZHANG Bao,GU Zhenghao,et al.Analysis on economic cost of primary frequency regulation of throttling steam turbine units[J].Electric Power,2016,49(7):86-89.
[20]马汀山,许朋江,程东涛,等.华能威海发电有限责任公司5号机组汽轮机及冷端系统运行优化试验报告[R].西安:西安热工研究院有限公司,2011:14-30.MA Tingshan,XU Pengjiang,CHENG Dongtao,et al.No.5 steam turbine and cold-end system operation optimization test report of Huaneng Weihai Power Station[R].Xi’an:Xi’an Thermal Power Research Institute Co.,Ltd.,2011:14-30.
[2]高强,张小聪,施正钗,等.±800 k V宾金直流双极闭锁故障对浙江电网的影响[J].电网与清洁能源,2014,30(11):47-51.GAO Qiang,ZHANG Xiaocong,SHI Zhengchai,et al.Impact of±800 kV Yibin-Jinhua DC bipolar block fault on Zhejiang power grid[J].Power System and Clean Energy,2014,30(11):47-51.
[3]陶骞,贺颖,潘杨,等.电力系统频率分布特征及改进一次调频控制策略研究[J].电力系统保护与控制,2016,44(17):133-138.TAO Qian,HE Ying,PAN Yang,et al.Characteristics of power system frequency abnormal distribution and improved primary frequency modulation control strategy[J].Power System Protection and Control,2016,44(17):133-138.
[4]费惟庆.1 000 MW超超临界汽轮机配汽方式优化试验[J].热力透平,2015,44(2):90-93.FEI Weiqing.Optimization test for steam distribution mode of 1000 MW USC steam turbines[J].Thermal Turbine,2015,44(2):90-93.
[5]包劲松,孙永平.1 000 MW汽轮机滑压优化试验研究及应用[J].中国电力,2012,45(12):12-15.BAO Jinsong,SUN Yongping.Experimental research&application of sliding pressure optimization for 1 000 MWsteam turbines[J].Electric Power,2012,45(12):12-15.
[6]陈小强,罗志浩,尹峰.补汽阀投用对1 000 MW机组夏季运行工况的影[J].中国电力,2011,44(4):63-66.CHEN Xiaoqiang,LUO Zhihao,YIN Feng.Influence of overload valve on 1 000 MW unit operation condition in summer[J].Electric Power,2011,44(4):63-66.
[7]刘鑫屏,田亮,曾德良,等.凝结水节流参与机组符合调节过程建模与分析[J].华北电力大学学报,2009,36(2):80-84.LIU Xinping,TIAN Liang,ZENG Deliang,et al.Modeling and analysis for the units load regulation by condensate throttling[J].Journal of North China Electric Power University,2009,36(2):80-84.
[8]许龙虎.凝结水调频技术在泰州电厂的应用[J].电力勘测设计,2016(4):45-48.XU Longhu.Application of condensation water frequency modulation technology in Taizhou power plant[J].Electric Power Survey and Design,2016(4):45-48.
[9]刘兴晖,任江波,马力,等.600 MW机组凝结水系统节能优化运行分析[J].河北电力技术,2013,32(增刊1):9-11.LIU Xinghui,REN Jiangbo,MA Li,et al.Analysis on condensate water system energy saving of 600 MWunits[J].Hebei Electric Power,2013,32(Suppl.1):9-11.
[10]王国凯,张峰,展宗波,等.凝结水节流技术在电厂的应用探讨[J].内蒙古电力技术,2011,29(2):45-47.WANG Guokai,ZHANG Feng,ZHAN Zongbo,et al.Discussion on application of condensate flow-saving technique in power plant[J].Inner Mongolia Electric Power,2011,29(2):45-47.
[11]范庆伟,常东锋,柴琦,等.凝结水变负荷技术对低温省煤器系统影响特性试验与模拟研究[J].热力发电,2017,46(11):39-43.FAN Qingwei,CHANG Dongfeng,CHAI Qi,et al.Effect of condensate load adjustment technology on low temperature economizer system:experimental and numerical study[J].Thermal Power Generation,2017,46(11):39-43.
[12]宋文希,屈杰,杨荣祖,等.华能临河电厂灵活性改造项目可行性研究[R].西安:西安热工研究院有限公司,2016:11-21.SONG Wenxi,QU Jie,YANG Rongzu,et al.Feasibility studies of Huaneng Linhe Power Station flexibility transformation projects[R].Xi’an:Xi’an Thermal Power Research Institute Co.,Ltd.,2016:11-21.
[13]WICHTMANN A,WECHSUNG M,ROSENKRANZ J,et al.Flexible load operation and frequency support for steam turbine power plants[J].VGB Powertech,2007,87:49-55.
[14]LAUSTERER G K.Improved maneuverability of power plants for better grid stability[J].Control Engineering Practice,1998,6(12):1549-1557.
[15]常东锋,雒青,范庆伟,等.二次再热机组高压低温省煤器参与负荷调节的动态特性模拟研究[J].热力发电,2017,46(8):77-81.CHANG Dongfeng,LUO Qing,FAN Qingwei,et al.Dynamic characteristics of high pressure low temperature economizer system when participating in load adjustment for double-reheat units[J].Thermal Power Generation,2017,46(8):77-81.
[16]杜洋洋,冯伟忠.基于弹性回热技术的调频性能研究[J].华东电力,2014,42(9):1944-1949.DU Yangyang,FENG Weizhong.Research of properties of frequency regulation based on the flexible extraction technology[J].East China Electric Power,2014,42(9):1944-1949.
[17]WANG W,LIU J,ZENG D,et al.Variable-speed technology used in power plants for better plant economics and grid stability[J].Energy,2012,45(1):588-594.
[18]LIU J,HU Y,ZENG D,et al.Optimization of an aircooling system and its application for grid stability[J].Applied Thermal Engineering,2013,61(2):206-212.
[19]樊印龙,张宝,顾正皓,等.节流配汽汽轮机组一次调频经济代价分析[J].中国电力,2016,49(7):86-89.FAN Yinlong,ZHANG Bao,GU Zhenghao,et al.Analysis on economic cost of primary frequency regulation of throttling steam turbine units[J].Electric Power,2016,49(7):86-89.
[20]马汀山,许朋江,程东涛,等.华能威海发电有限责任公司5号机组汽轮机及冷端系统运行优化试验报告[R].西安:西安热工研究院有限公司,2011:14-30.MA Tingshan,XU Pengjiang,CHENG Dongtao,et al.No.5 steam turbine and cold-end system operation optimization test report of Huaneng Weihai Power Station[R].Xi’an:Xi’an Thermal Power Research Institute Co.,Ltd.,2011:14-30.