Assessment Method and Indexes of Operating States Classification for Distribution System With Distributed Generations

Self-healing is a key characteristic and goal of smart grid, which is based on the classification of the operating states of the power system. With views to the differences between the distribution and transmission system in terms of the operation model and structural features, an essential difference can appear in the classification of operating states between these two systems. According to the characteristics of distribution system with distributed generations (DGs), a new method based on hierarchical classification is proposed to classify the operating states of distribution system with DGs. In this method, several important performances reflecting the operating conditions of distribution system are regarded as critical attributes, including external stability, reliability, integrity, and economy. Moreover, different transition paths and control targets in different states are proposed to demonstrate the effectiveness of the classification method, which aim at the safety and reliability of the distribution system operation. Finally, a control strategy based on state classification is presented to support the decision-making for the self-healing distribution system. A case study demonstrates the feasibility and effectiveness of the classification method for the operating states of distribution system.

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