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As the development of economic and society, the reliability of distribution system is more important than ever. Traditional distribution automation has developed a lot in order to cope with the evolution of smart distribution system and to meet the reliability and other requirements such as security, economical, efficiency and clean. In this article, we focus on the technology framework and functions of advanced distribution system and investigate on whether advanced distribution system is sufficient enough to prevent large scale black out. We review the procedures and outline the key factors that caused the blackout in Northwest Queen, which took place in 2006. Then we evaluate the functional performance of advanced distribution automation with the real case to check whether it is enough to prevent large scale blackout and enhance the reliability of distribution system. Based on the evaluation results, we discuss the key technologies as supplement for the advanced distribution automation to realize self-healing smart distribution system. The research in this article proposes a method to evaluate whether present practical self-healing system is adequate and sufficient enough to prevent large scale blackout and guarantee the security of distributed system. The observations in this article can be used to guide the real projects of advanced distribution automation and self-healing distribution system.

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Abstract. Power flow diagram is an important tool of modern Energy Management System (EMS)for system operators to schedule the operation and maintenance plan, examine security situation and dispatch in real-time. Manually creation and maintenance of power flow diagram of large scale power grid is time consuming and error prone. In the previous research, exposure of the detail information inside substations that is of interest to system operators and incremental update of the generated diagrams are not supported for diagram automatic generation of power flow diagrams. In this paper, we propose dynamic viewport display method for automatic generation of large scale power flow diagram. Firstly, integrative management of model and graph of the power grid is introduced. Then dynamic viewport display method is developed to automatically generate the power flow diagram for large scale power grid. With our proposed approach, essential layout inside the substation is exposed to support systematic simulation and control. Besides, incremental mapping is supported to increase the efficiency for diagram generation and maintenance. The method could not only improve efficiency and practicability of power flow diagram automatic generation, but also provide the systematic and integrative map for simulation and control of the power grid. The example in actual projects has shown its advantages.