Since renewable energy resource is universally accepted as a promising method to solve the global energy problem, optimal planning and utilization of various distributed generators (DG) and energy storage (ES) devices deserve special concern. ES devices possess various characteristics in power density, energy density, response speed (switching speed) and lifetime. Besides, as different load types have various requirements on power supply reliability according to their importance, coordinated planning with consideration of reasonable matching between power source and load can efficiently improve power supply reliability and economic efficiency via a customized power supply and compensation strategy. This paper focuses on optimization of power source capacity in microgrid and a coordinated planning strategy is proposed with integrated consideration of characteristics of DG, ES and load. An index named additional compensation ratio (ACR) for balancing economic efficiency and reliability is proposed and considered in the strategy. The objective function which aims to minimize life cycle cost (LCC) is established considering economic efficiency, reliability and environmental conservation. The proposed planning strategy and optimizing model is calculated and verified through case study of an autonomy microgrid.

Original Research ArticleIn the rapidly changing market environment, how could scenic spots innovate their services more effectively? In order to solve this problem, this paper constructs a theoretical framework of "internal and external environment→cultural tourism integration path→service innovation model" and takes Chime-Long Paradise as research object. The results indicate that: (1) Driven by internal and external environmental factors, the service innovation model of scenic spots presents the evolutionary track of "tangible product value-added model→market expansion model →value promotion model". (2) Integration paths of culture and tourism influent the evolution of the model of service innovation in scenic spots differently: resource integration and technology integration provide the essential foundation for the service innovation; market integration and function integration jointly promote the evolution of service innovation. However, market integration and function integration cannot be separated from resource integration and technology integration to work.

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