含燃气蒸汽联合循环机组(combined-cycle gas turbine,CCGT)的电–气耦合系统,是综合能源系统一种主要的配置形式。CCGT运行灵活,可以追踪负荷和新能源出力的波动,为综合能源系统提供备用,因此非常有必要对CCGT的备用配置开展研究。建...含燃气蒸汽联合循环机组(combined-cycle gas turbine,CCGT)的电–气耦合系统,是综合能源系统一种主要的配置形式。CCGT运行灵活,可以追踪负荷和新能源出力的波动,为综合能源系统提供备用,因此非常有必要对CCGT的备用配置开展研究。建立考虑CCGT运行模式的综合能源系统备用配置模型,实现备用市场条件下备用的精确有效配置,解决传统模型无法考虑CCGT运行模式导致备用配置过于乐观的问题。提出基于天然气最小切负荷的综合能源系统备用校核模型,通过校核保证CCGT备用在实际运行需要变为出力时,天然气系统留有足够裕度满足容量备用的出力要求。算例结果表明,提出的模型考虑CCGT的运行模式,克服了传统线性模型高估CCGT的爬坡能力导致系统实际备用不足的问题,保证系统的运行安全;含CCGT的综合能源系统备用校核确保实际运行时CCGT容量备用的充足供气,保证CCGT备用的可用性。展开更多
Abstract An f-coloring of a graph G is an edge-coloring of G such that each color appears at each vertex v ∈ V（G） at most f（v） times. The f-core of G is the subgraph of G induced by the vertices v of degree d（v...Abstract An f-coloring of a graph G is an edge-coloring of G such that each color appears at each vertex v ∈ V（G） at most f（v） times. The f-core of G is the subgraph of G induced by the vertices v of degree d（v） = f（v）maxv∈y（G）{ [d（v）/f（v）l}. In this paper, we find some necessary conditions for a simple graph, whose f-core has maximum degree two, to be of class 2 for f-colorings.展开更多
This letter proposes a novel hybrid component and configuration model for combined-cycle gas turbines(CCGTs) participating in independent system operator(ISO) markets. The proposed model overcomes the inaccuracy issue...This letter proposes a novel hybrid component and configuration model for combined-cycle gas turbines(CCGTs) participating in independent system operator(ISO) markets. The proposed model overcomes the inaccuracy issues in the current configuration-based model while retaining its simple and flexible bidding framework of configuration-based models. The physical limitations—such as minimum online/offline time and ramping rates—are modeled for each component separately, and the cost is calculated with the bidding curves from the configuration modes. This hybrid mode can represent the current dominant bidding model in the unit commitment problem of ISOs while treating the individual components in CCGTs accurately. The commitment status of the individual components is mapped to the unique configuration mode of the CCGTs. The transitions from one configuration mode to another are also modeled. No additional binary variables are added, and numerical case studies demonstrate the effectiveness of this model for CCGT units in the unit commitment problem.展开更多
文摘含燃气蒸汽联合循环机组(combined-cycle gas turbine,CCGT)的电–气耦合系统,是综合能源系统一种主要的配置形式。CCGT运行灵活,可以追踪负荷和新能源出力的波动,为综合能源系统提供备用,因此非常有必要对CCGT的备用配置开展研究。建立考虑CCGT运行模式的综合能源系统备用配置模型,实现备用市场条件下备用的精确有效配置,解决传统模型无法考虑CCGT运行模式导致备用配置过于乐观的问题。提出基于天然气最小切负荷的综合能源系统备用校核模型,通过校核保证CCGT备用在实际运行需要变为出力时,天然气系统留有足够裕度满足容量备用的出力要求。算例结果表明,提出的模型考虑CCGT的运行模式,克服了传统线性模型高估CCGT的爬坡能力导致系统实际备用不足的问题,保证系统的运行安全;含CCGT的综合能源系统备用校核确保实际运行时CCGT容量备用的充足供气,保证CCGT备用的可用性。
基金Supported by National Natural Science Foundation of China(Grant Nos.10901097,11001055)Tianyuan Youth Foundation of Mathematics(Grant No.10926099)+1 种基金Natural Science Foundation of Shandong(Grant No.ZR2010AQ003)Shandong Province Higher Educational Science and Technology Program(Grant No.G13LI04)of China
文摘Abstract An f-coloring of a graph G is an edge-coloring of G such that each color appears at each vertex v ∈ V（G） at most f（v） times. The f-core of G is the subgraph of G induced by the vertices v of degree d（v） = f（v）maxv∈y（G）{ [d（v）/f（v）l}. In this paper, we find some necessary conditions for a simple graph, whose f-core has maximum degree two, to be of class 2 for f-colorings.
基金supported by the U.S.Department of Energy under Contract No.DE-AC36-08GO28308 with Alliance for Sustainable Energy,LLC,the Manager and Operator of the National Renewable Energy LaboratoryU.S.Department of Energy Office of Energy Efficiency and Renewable Energy Wind Energy Technologies Office
文摘This letter proposes a novel hybrid component and configuration model for combined-cycle gas turbines(CCGTs) participating in independent system operator(ISO) markets. The proposed model overcomes the inaccuracy issues in the current configuration-based model while retaining its simple and flexible bidding framework of configuration-based models. The physical limitations—such as minimum online/offline time and ramping rates—are modeled for each component separately, and the cost is calculated with the bidding curves from the configuration modes. This hybrid mode can represent the current dominant bidding model in the unit commitment problem of ISOs while treating the individual components in CCGTs accurately. The commitment status of the individual components is mapped to the unique configuration mode of the CCGTs. The transitions from one configuration mode to another are also modeled. No additional binary variables are added, and numerical case studies demonstrate the effectiveness of this model for CCGT units in the unit commitment problem.
