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A dynamic simulation study of networked microgrids in active distribution system

The Active distribution system (ADS) is a promising operational framework for integrating and coordinating distributed energy resources (DERs) at high penetration levels. In this paper, the detailed electromagnetic model of an ADS has been constructed in PSCAD. The model is used to study the dynamic performances of the ADS under various operational scenarios. The simulation case studies have demonstrated the operational feasibility of DERs in performing economic dispatch and grid ancillary services for the bulk transmission and the local distribution systems. Our studies show that the ADS is able to maintain frequency and voltage response characteristics under both grid-connected and standalone operating conditions. In the meantime, the ADS presents itself with desirable operational characteristics to the upstream transmission system, such as frequency droop response and reactive power support capability.