Power plants are nonlinear and uncertain complex systems. Reliable control of superheated steam temperature is necessary to ensure high efficiency and high load-following capability in the operation of modem power pla...Power plants are nonlinear and uncertain complex systems. Reliable control of superheated steam temperature is necessary to ensure high efficiency and high load-following capability in the operation of modem power plant. A nonlinear generalized predictive controller based on neuro-fuzzy network （NFGPC） is proposed in this paper. The proposed nonlinear controller is applied to control the superheated steam temperature of a 200MW power plant. From the experiments on the plant and the simulation of the plant, much better performance than the traditional controller is obtained,展开更多
The design and implementation of a Generalized Predictive Control(GPC)strategy for the superheated steam temperature regulation in a supercritical(SC)coal-fired power plant is presented.A Controlled Auto-Regressive Mo...The design and implementation of a Generalized Predictive Control(GPC)strategy for the superheated steam temperature regulation in a supercritical(SC)coal-fired power plant is presented.A Controlled Auto-Regressive MovingAverage(CARMA)model of the plant is derived from using the experimental data to approximately predict the plant’s future behavior.This model is required by the GPC algorithm to calculate the future control inputs.A new GPC controller is designed and its performance is tested through extensive simulation studies.Compared with the performance of the plant using a conventional PID controller,the steam temperature controlled by the GPC controller is found to be more stable.The stable steam temperature leads to more efficient plant operation and energy saving,as demonstrated by the simulation results.Plant performance improvement is also tested while the plant experiences the load demand changes and disturbances resulting from the malfunctioning of coal mills.展开更多
Electrolyte regulation plays its critical role in addressing the reversibility issue of metallic Zn anode towards high-performance aqueous zinc ion batteries.In view of the flourish electrolyte additive approach,the r...Electrolyte regulation plays its critical role in addressing the reversibility issue of metallic Zn anode towards high-performance aqueous zinc ion batteries.In view of the flourish electrolyte additive approach,the review is organized to discuss the influence of electrolyte additive on the electrolyte-Zn chemistry for the representative zinc electrolytes.Accordingly,the effects of electrolyte additives on the fundamental physicochemical properties of electrolytes,Zn surface,and Zn deposition are discussed and summarized.Based on the revealed roles of additives in interface reaction across current literature,we further provide outlook and perspective on current issues of the additive approach and potential directions.展开更多
Organic persistent room-temperature phosphorescent(RTP)materials are promising for applications requiring the secure recording and anti-counterfeiting features owing to their appealing optical properties.Several criti...Organic persistent room-temperature phosphorescent(RTP)materials are promising for applications requiring the secure recording and anti-counterfeiting features owing to their appealing optical properties.Several critical challenges,such as the difficulty to obtain high-quality patterns over large areas and low security levels,need to be addressed to meet the requirements for commercial purpose.Here,we prepared a series of quaternary phosphonium salts with different alkyl chains,which showed interesting organic persistent RTP.The ionic characteristics and the alkyl chains of these molecules impart abundant weak intermolecular interactions.This confers the molecules a high crystallinity,which helps to preserve the persistent RTP properties and cover large areas.Moreover,the RTP lifetime of these organic salts varies over a wide range(1.27 to 884.71 ms)and can be tuned by simply changing the alkyl chain length and counterions,which opens new possibilities in multi-level information encryption applications.It is believed that the engineering of organic salts with tunable persistent RTP lifetimes and large-area printing can promote early-stage demonstrations of security applications into mature commercialization.展开更多
This paper presents an LMI based robust H-infinity control scheme for constrained systems with norm- bounded uncertainties. The uncertainties are incorporated in the evaluation of the H-infinity norm and the time-doma...This paper presents an LMI based robust H-infinity control scheme for constrained systems with norm- bounded uncertainties. The uncertainties are incorporated in the evaluation of the H-infinity norm and the time-domain constraints. The robust closed-loop properties inclusive of stability, H-infinity performance and the satisfaction of the time- domain constraints are discussed. Analysis and simulation results for a 2 DOF quarter-car model show possible improve- ments on ride comfort, while robustly respecting safety related constraints such as good road holding, limited suspension strokes and actuator saturation.展开更多
基金supported by National Natural Science Foundation of China(61533013,61273144)Scientific Technology Research and Development Plan Project of Tangshan(13130298B)Scientific Technology Research and Development Plan Project of Hebei(z2014070)
基金This work was supported by the Natural Science Foundation of Beijing (No. 4062030)National Natural Science Foundation of China (No. 50576022,69804003)Scientific Research Common Program of Beijing Municipal Commission of Education (KM200611232007).
文摘Power plants are nonlinear and uncertain complex systems. Reliable control of superheated steam temperature is necessary to ensure high efficiency and high load-following capability in the operation of modem power plant. A nonlinear generalized predictive controller based on neuro-fuzzy network （NFGPC） is proposed in this paper. The proposed nonlinear controller is applied to control the superheated steam temperature of a 200MW power plant. From the experiments on the plant and the simulation of the plant, much better performance than the traditional controller is obtained,
基金supported by the EPSRC Grant(EP/G062889/2),Advantage West Midlands and the European Regional Development Agency(Birmingham Science City Energy Efficiency&Demand Reduction project).
文摘The design and implementation of a Generalized Predictive Control(GPC)strategy for the superheated steam temperature regulation in a supercritical(SC)coal-fired power plant is presented.A Controlled Auto-Regressive MovingAverage(CARMA)model of the plant is derived from using the experimental data to approximately predict the plant’s future behavior.This model is required by the GPC algorithm to calculate the future control inputs.A new GPC controller is designed and its performance is tested through extensive simulation studies.Compared with the performance of the plant using a conventional PID controller,the steam temperature controlled by the GPC controller is found to be more stable.The stable steam temperature leads to more efficient plant operation and energy saving,as demonstrated by the simulation results.Plant performance improvement is also tested while the plant experiences the load demand changes and disturbances resulting from the malfunctioning of coal mills.
基金D.Y.would like to acknowledge the funding support from the 100 Talented Team of Hunan Province(No.XiangZu[2016]91)the Natural Science Foundation of Hunan Province(No.2022JJ30613).
文摘Electrolyte regulation plays its critical role in addressing the reversibility issue of metallic Zn anode towards high-performance aqueous zinc ion batteries.In view of the flourish electrolyte additive approach,the review is organized to discuss the influence of electrolyte additive on the electrolyte-Zn chemistry for the representative zinc electrolytes.Accordingly,the effects of electrolyte additives on the fundamental physicochemical properties of electrolytes,Zn surface,and Zn deposition are discussed and summarized.Based on the revealed roles of additives in interface reaction across current literature,we further provide outlook and perspective on current issues of the additive approach and potential directions.
基金financial support from the National Funds for Distinguished Young Scientists (61825503)the National Natural Science Foundation of China (62075101, 21701087 and 61775101)+1 种基金the National Program for Support of Top-Notch Young Professionalsthe Postgraduate Research & Practice Innovation Program of Jiangsu Province (46030CX18010)
文摘Organic persistent room-temperature phosphorescent(RTP)materials are promising for applications requiring the secure recording and anti-counterfeiting features owing to their appealing optical properties.Several critical challenges,such as the difficulty to obtain high-quality patterns over large areas and low security levels,need to be addressed to meet the requirements for commercial purpose.Here,we prepared a series of quaternary phosphonium salts with different alkyl chains,which showed interesting organic persistent RTP.The ionic characteristics and the alkyl chains of these molecules impart abundant weak intermolecular interactions.This confers the molecules a high crystallinity,which helps to preserve the persistent RTP properties and cover large areas.Moreover,the RTP lifetime of these organic salts varies over a wide range(1.27 to 884.71 ms)and can be tuned by simply changing the alkyl chain length and counterions,which opens new possibilities in multi-level information encryption applications.It is believed that the engineering of organic salts with tunable persistent RTP lifetimes and large-area printing can promote early-stage demonstrations of security applications into mature commercialization.
基金financially supported by the Fundamental Research Funds for the Central Universities(No.12MS49)the Program for Excellent Talents of Beijing(No.2011A009005000001)the Overseas Training Project for Young Key Teachers(No.[2011]3022)
文摘This paper presents an LMI based robust H-infinity control scheme for constrained systems with norm- bounded uncertainties. The uncertainties are incorporated in the evaluation of the H-infinity norm and the time-domain constraints. The robust closed-loop properties inclusive of stability, H-infinity performance and the satisfaction of the time- domain constraints are discussed. Analysis and simulation results for a 2 DOF quarter-car model show possible improve- ments on ride comfort, while robustly respecting safety related constraints such as good road holding, limited suspension strokes and actuator saturation.
