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

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