Themassive integration of high-proportioned distributed photovoltaics into distribution networks poses significant challenges to the flexible regulation capabilities of distribution stations.To accurately assess the f...Themassive integration of high-proportioned distributed photovoltaics into distribution networks poses significant challenges to the flexible regulation capabilities of distribution stations.To accurately assess the flexible regulation capabilities of distribution stations,amulti-temporal and spatial scale regulation capability assessment technique is proposed for distribution station areas with distributed photovoltaics,considering different geographical locations,coverage areas,and response capabilities.Firstly,the multi-temporal scale regulation characteristics and response capabilities of different regulation resources in distribution station areas are analyzed,and a resource regulation capability model is established to quantify the adjustable range of different regulation resources.On this basis,considering the limitations of line transmission capacity,a regulation capability assessment index for distribution stations is proposed to evaluate their regulation capabilities.Secondly,considering different geographical locations and coverage areas,a comprehensive performance index based on electrical distance modularity and active power balance is established,and a cluster division method based on genetic algorithms is proposed to fully leverage the coordination and complementarity among nodes and improve the active power matching degree within clusters.Simultaneously,an economic optimization model with the objective of minimizing the economic cost of the distribution station is established,comprehensively considering the safety constraints of the distribution network and the regulation constraints of resources.This model can provide scientific guidance for the economic dispatch of the distribution station area.Finally,case studies demonstrate that the proposed assessment and optimization methods effectively evaluate the regulation capabilities of distribution stations,facilitate the consumption of distributed photovoltaics,and enhance the economic efficiency of the distribution station area.展开更多
In recent years, the world economic situation and container shipping industry has been fluctuated drastically, which has complicated the liner shipping companies＇ operation. The conventional issue of overcapacity due...In recent years, the world economic situation and container shipping industry has been fluctuated drastically, which has complicated the liner shipping companies＇ operation. The conventional issue of overcapacity due to the ＂equipment battle＂, and the destructive competition have further stimulated the operating intricacy within the container sector. That would be interesting to explore the chartering strategies of CMA CGM （Compagnie Maritime d＇Affretement Compagnie Generale Maritime） in such a volatile market as any capacity adjustment dictates a line＇s profit line. Nevertheless, the usefulness of ship chartering is not only confined to the operational level but also the strategic level. Throughout the analysis of CMA CGM＇s fleet trend, fleet deployment as well as chartering activities, it can illustrate the above concepts and observe a little bit further about the strategic movement of CMA CGM.展开更多
基金funded by the“Research and Application Project of Collaborative Optimization Control Technology for Distribution Station Area for High Proportion Distributed PV Consumption(4000-202318079A-1-1-ZN)”of the Headquarters of the State Grid Corporation.
文摘Themassive integration of high-proportioned distributed photovoltaics into distribution networks poses significant challenges to the flexible regulation capabilities of distribution stations.To accurately assess the flexible regulation capabilities of distribution stations,amulti-temporal and spatial scale regulation capability assessment technique is proposed for distribution station areas with distributed photovoltaics,considering different geographical locations,coverage areas,and response capabilities.Firstly,the multi-temporal scale regulation characteristics and response capabilities of different regulation resources in distribution station areas are analyzed,and a resource regulation capability model is established to quantify the adjustable range of different regulation resources.On this basis,considering the limitations of line transmission capacity,a regulation capability assessment index for distribution stations is proposed to evaluate their regulation capabilities.Secondly,considering different geographical locations and coverage areas,a comprehensive performance index based on electrical distance modularity and active power balance is established,and a cluster division method based on genetic algorithms is proposed to fully leverage the coordination and complementarity among nodes and improve the active power matching degree within clusters.Simultaneously,an economic optimization model with the objective of minimizing the economic cost of the distribution station is established,comprehensively considering the safety constraints of the distribution network and the regulation constraints of resources.This model can provide scientific guidance for the economic dispatch of the distribution station area.Finally,case studies demonstrate that the proposed assessment and optimization methods effectively evaluate the regulation capabilities of distribution stations,facilitate the consumption of distributed photovoltaics,and enhance the economic efficiency of the distribution station area.
文摘In recent years, the world economic situation and container shipping industry has been fluctuated drastically, which has complicated the liner shipping companies＇ operation. The conventional issue of overcapacity due to the ＂equipment battle＂, and the destructive competition have further stimulated the operating intricacy within the container sector. That would be interesting to explore the chartering strategies of CMA CGM （Compagnie Maritime d＇Affretement Compagnie Generale Maritime） in such a volatile market as any capacity adjustment dictates a line＇s profit line. Nevertheless, the usefulness of ship chartering is not only confined to the operational level but also the strategic level. Throughout the analysis of CMA CGM＇s fleet trend, fleet deployment as well as chartering activities, it can illustrate the above concepts and observe a little bit further about the strategic movement of CMA CGM.
