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Improved Optimal Operation Planning Method Based on Tabu Search for Residential PEFC-CGS Considering ramping Rate

Journal of Power and Energy Engineering 2015年第4期3卷 274-281页

作者： Satoshi Nomoto Teruhisa Kumano Department of Electrical Engineering Meiji University Kawasaki Japan

This paper proposes an improved optimal operation planning method for residential PEFC-CGS (Polymer Electrolyte Fuel CellCo-Generation System). Residential PEFC-CGS has recently been gathering attention as one of the distributed power sources with high efficiency and low environmental impacts. Previous research pointed out that the output variations of PEFC adversely affect the durability. It can be surmised that smaller output variations will be desired to extend durability years. However, in this field, ramping rate have not been sufficiently considered. For local search and tabu search, ramping rate constraint makes our operation planning difficult because it restricts the search for feasible neighborhood solutions. Therefore, the authors proposed a method to deal with typical and harsher ramping rate constraints in comparison with conventional methods. There are two key points for the improvement. One is the reinforcement of the search along the output power axis;the other is to make use of the strategy of tabu search which avoids the local optimal solutions. The simulation results show the effectiveness of the proposed method in the daily operation planning. Furthermore, in the case using typical ramping rate parameter, it is confirmed that tabu search doesn’t contribute the reduction of daily operational cost due to the above stated restriction of the search area.

关键词： Distributed Generation PEFC-CGS Local Search Tabu Search Operation Planning ramping Rate

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用于增强器ramping的任意波形发生器

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核技术 2003年第2期26卷 95-98页

作者：沈国保冷用斌郑丽芳陆承蒙刘松强中国科学技术大学近代物理系中国科学院上海原子核研究所上海201800 中国科学院上海原子核研究所

在EPICS环境下,利用商业硬件模块以及vxWorks实时操作系统,采用软件方式实现用于增强器ramping的任意波形发生器,详细分析了其结构,并给出了原理性测试结果。该任意波形发生器不仅可以用在增强器磁铁电源的控制中,而且可以用于加速器的... 详细信息

在EPICS环境下,利用商业硬件模块以及vxWorks实时操作系统,采用软件方式实现用于增强器ramping的任意波形发生器,详细分析了其结构,并给出了原理性测试结果。该任意波形发生器不仅可以用在增强器磁铁电源的控制中,而且可以用于加速器的高频系统腔压的动态控制。

关键词： EPICS ramping 任意波形发生器

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A Novel Polarization Maintaining Fiber

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光学学报 2003年第S1期23卷 7-8页

作者： Benjamin XueJiangsu Fasten Photonics Company 1 Wenhua East Road, Jiangyin, Jiangsu, P. R. China, 214434 Jiangsu Fasten Photonics Company 1 Wenhua East Road Jiangyin Jiangsu P. R. China 214434

It introduces a novel elliptical jacket polarization maintaining fiber, whose SAP is like numeral "1". One preform can be drawn over 8km. Fiber's performances show that it is fit for fiber gyroscope and other sensors.

关键词： elliptical jacket 1-style PM fiber extinction ratio SAP ramping

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Shifts in hydropower operation to balance wind and solar will modify effects on aquatic biota

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Water Biology and Security 2022年第3期1卷 88-98页

作者： Henriette I.Jager Thushara De Silva Rocio Uria-Martinez Brenda M.Pracheil Jordan Macknick Oak Ridge National Laboratory Oak RidgeTN37831-6038USA National Renewable Energy Laboratory GoldenCOUSA

To avoid negative consequences to freshwater biota from climate change,society must complete the transition from fossil to renewable electricity ***,temporal patterns in hydropower generation(and flow releases that affect aquatic biota)may change with increased wind and solar *** used power cost modeling to characterize current and future within-day and seasonal patterns in hydropower generation across the Eastern Interconnection in a wet and a dry *** to the baseline,future hydropower generation across the grid decreased during the day and increased before dawn and after *** a project level,such a pattern would suggest‘double peaking’operation(up-and down-ramping before dawn and after dusk,with lower releases midday).Variation in generation was higher in wet years than dry years,foreshadowing possible flow constraints on hydropower *** the grid scale,projected ramping rates were higher in all seasons.A review of the ecological literature suggests that these changes would shift the timing of invertebrate drift and elevate the risk of nest scouring during up-ramping and the risk of stranding or dewatering during down *** conditions may be moderated by increased *** for adapting to future shifts in the renewable portfolio range from re-regulation in reservoir cascades to providing flow refuge(structures and vegetation)below individual *** basin-scale operation can distribute peaking operation to maintain grid support while restricting local ramping at critical ecological *** addition,research to design hybrid renewable systems that add battery storage is needed to understand how we can mitigate future risks to aquatic communities while promoting the use of renewable *** study,which is among the first to examine ecological side-effects of the shift to renewable energy in freshwater ecosystems,lays out a path toward understanding and navigating changes to flow regime

关键词： Wind Solar Hydropower Hydropeaking Temporal niche Double peaking ramping Stranding Dewatering PLEXOS

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A Novel PSO Algorithm for Optimal Production Cost of the Power Producers with Transient Stability Constraints

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Journal of Electromagnetic Analysis and Applications 2009年第4期1卷 265-274页

作者： M. ANITHA S. SUBRAMANIAN R. GNANADASS 不详

The application of a novel Particle Swarm Optimization (PSO) method called Fitness Distance Ratio PSO (FDR PSO) algorithm is described in this paper to determine the optimal power dispatch of the Independent Power Producers (IPP) with linear ramp model and transient stability constraints of the power producers. Generally the power producers must respond quickly to the changes in load and wheeling transactions. Moreover, it becomes necessary for the power producers to reschedule their power generation beyond their power limits to meet vulnerable situations like credible contingency and increase in load conditions. During this process, the ramping cost is incurred if they violate their permissible elastic limits. In this paper, optimal production costs of the power producers are computed with stepwise and piecewise linear ramp rate limits. Transient stability limits of the power producers are also considered as addi-tional rotor angle inequality constraints while solving the Optimal Power Flow (OPF) problem. The proposed algo-rithm is demonstrated on practical 10 bus and 26 bus systems and the results are compared with other optimization methods.

关键词： Optimal Power Flow Production Cost ramping Cost Fitness Distance Ratio Particle Swarm Optimization Transient Stability Limit Piecewise Linear Ramp Rate Limit

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