  Aggregating distributed energy resources (DERs) is of great significance to
improve the overall operational efficiency of smart grid. The aggregation model
needs to consider various factors such as network constraints, operational
constraints, and economic characteristics of the DERs. This paper constructs a
multi-slot DER aggregation model that considers the above factors using
feasible region projection approach, which achieved the protection of DERs data
information and the elimination of internal variables. A system economic
dispatch (ED) model is established for the operators to make full use of the
DER clusters. We calculate the feasible regions with temporal coupling by
extending the Progressive Vertex Enumeration (PVE) algorithm to high dimension
by the Quickhull algorithm. Finally, an IEEE 39-bus distribution network is
simulated with DERs to verify the effectiveness of the proposed model. Results
show that the two-step ED derives the same results as the centralized ED.
