共查询到20条相似文献,搜索用时 718 毫秒
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基于自适应逆控制的汽轮机调速系统研究 总被引:2,自引:1,他引:1
针对汽轮机调速系统具有时滞、非线性、动态特性随工况显著变化和难以精确建模等特点,采用自适应逆控制理论并结合神经网络技术,提出了汽轮机调速系统自适应逆控制方案.该方案利用RBF神经网络在线辨识获得对象模型、逆模型和扰动消除控制器,对给定转速信号和外部扰动分别进行控制,使两者同时达到最佳控制效果.对200MW机组汽轮机调速系统进行了仿真实验,结果表明:与PID汽轮机调速控制方案相比,该方案能很好地适应汽轮机调速对象特性的变化,有效克服对象的惯性和非线性,并有效抑制外部扰动,明显改善汽轮机调速系统的控制品质. 相似文献
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基于MMS仿真环境,以360MW发电机组汽轮机系统为对象,建立了汽轮机实时动态模型,并对该模型进行了仿真试验以及动态特性分析。仿真试验结果表明,模型能达到实时的要求,动态响应符合对象的机理。 相似文献
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基于果蝇优化算法的汽轮机调节系统参数辨识 总被引:1,自引:0,他引:1
《动力工程学报》2015,(7):556-561
为了建立用于电力系统稳定计算的汽轮机调节系统的准确模型,通过现场试验的方法得到某电厂试验数据并进行了相关预处理,采用果蝇优化算法对该电厂汽轮机调节系统各环节的参数进行辨识,最后对辨识结果进行仿真校核,给出仿真曲线与实测曲线的对比结果,并计算出各误差指标.结果表明:所采用的果蝇优化算法适用于汽轮机调节系统参数辨识,经过仿真校核得到的模型与机组实际特性趋于一致,验证了该方法的实用有效性. 相似文献
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余热锅炉动态特性的数值计算 总被引:2,自引:0,他引:2
本文对单压余热锅炉的动态特性进行了数值计算。分析了当燃气轮机排烟温度和流量发生扰动时,余热锅炉出口参数随时间的变化规律。研究结果为联合循环余热锅炉控制系统的设计提供了理论依据。 相似文献
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Solid oxide fuel cell (SOFC) is a promising technology for electricity generation. Sulfur-free syngas from a gas-cleaning unit serves as fuel for SOFC in integrated gasification fuel cell (IGFC) power plants. It converts the chemical energy of fuel gas directly into electric energy, thus high efficiencies can be achieved. The outputs from SOFC can be utilized by heat recovery steam generator (HRSG), which drives the steam turbine for electricity production. The SOFC stack model was developed using the process flow sheet simulator Aspen Plus, which is of the equilibrium type. Various ranges of syngas properties gathered from different literature were used for the simulation. The results indicate a trade-off efficiency and power with respect to a variety of SOFC inputs. The HRSG located after SOFC was included in the current simulation study with various operating parameters. This paper describes IGFC power plants, particularly the optimization of HRSG to improve the efficiency of the heat recovery from the SOFC exhaust gas and to maximize the power production in the steam cycle in the IGFC system. HRSG output from different pressure levels varies depending on the SOFC output. The steam turbine efficiency was calculated for measuring the total power plant output. The aim of this paper is to provide a simulation model for the optimal selection of the operative parameters of HRSG and SOFC for the IGFC system by comparing it with other models. The simulation model should be flexible enough for use in future development and capable of predicting system performance under various operating conditions. 相似文献
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Souman Rudra Jinwook Lee L. Rosendahl H. T. Kim 《Frontiers of Energy and Power Engineering in China》2010,4(3):402-413
Solid oxide fuel cell (SOFC) is a promising technology for electricity generation. Sulfur-free syngas from a gas-cleaning
unit serves as fuel for SOFC in integrated gasification fuel cell (IGFC) power plants. It converts the chemical energy of
fuel gas directly into electric energy, thus high efficiencies can be achieved. The outputs from SOFC can be utilized by heat
recovery steam generator (HRSG), which drives the steam turbine for electricity production. The SOFC stack model was developed
using the process flow sheet simulator Aspen Plus, which is of the equilibrium type. Various ranges of syngas properties gathered
from different literature were used for the simulation. The results indicate a trade-off efficiency and power with respect
to a variety of SOFC inputs. The HRSG located after SOFC was included in the current simulation study with various operating
parameters. This paper describes IGFC power plants, particularly the optimization of HRSG to improve the efficiency of the
heat recovery from the SOFC exhaust gas and to maximize the power production in the steam cycle in the IGFC system. HRSG output
from different pressure levels varies depending on the SOFC output. The steam turbine efficiency was calculated for measuring
the total power plant output. The aim of this paper is to provide a simulation model for the optimal selection of the operative
parameters of HRSG and SOFC for the IGFC system by comparing it with other models. The simulation model should be flexible
enough for use in future development and capable of predicting system performance under various operating conditions. 相似文献
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为了提高汽轮机能耗预警水平,将多变量状态估计技术(MSET)作为汽轮机能效监测的数据挖掘方法,在完成不同工况机组能耗水平分类的基础上,利用改进的熵权法计算能效偏离度。将偏离度和警报阈值结合来判断汽轮机运行工况水平,及时获取能耗时间点,并定位引起能耗异常的特征参数,该方法克服了单一热耗率指标评价能效变化的局限性。以某电站600 MW机组的汽轮机历史运行数据为研究对象,借助聚类算法完成汽轮机热耗分类,以最佳热耗率所在类簇的部分运行数据作为训练样本建立MSET能耗模型,并完成模型正确性验证。利用剩余类簇在能耗模型下实际观测值和模型估计值的偏差,并结合信息熵权法分配与热耗相关的特征参数属性权重,计算获得偏离度指数,完成汽轮机能耗异常预警。结果表明:该方法可以为汽轮机能效异常变化提供及时的预警信息并定位导致能耗异常的参数。 相似文献
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Oguz Borat 《Energy Conversion and Management》1982,22(1):13-18
An open cycle gas turbine with a heat exchanger and its modifications have been studied. These modifications include the combinations of the gas turbine with a steam injection system and the gas turbine with a closed cycle steam turbine. The steam is generated by a waste heat boiler. It was found that in both cases the efficiency and the net output of the gas turbine increased considerably, of the order of 20–40%. In order to define the superiority regions of the systems studied on various ranges of power output, an economic analysis per unit power has been done. For short duration, intermittent type of operation the steam injection was found superior. Above this mode of operation, the operational modes of electric base and continuous were covered by the gas turbine combined with the steam turbine. 相似文献