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In this paper, the characteristics of typical smart microgrid are analyzed and the key technology of smoothing coordinated control method is studied. Moreover, in order to obtain a smooth switch between grid-connected mode to off-grid mode, a smoothing control method is proposed and realized. The technology include a synchronization detection method which is based on the leading angle algorithm, a fast power balance control technology based on GOOSE communication technology and a control strategy based on XML language. Based on this technologies, the smoothing coordinated control strategy is realized. The RTDS simulation platform is established and the result is verified. Keywords—microgrid; grid-connected mode; off-grid mode; GOOSE communication

A Smoothing Control Strategy between Grid-connected Mode and Off-grid Mode for Smart Microgrid and Its Design