The Impact of Detailed Distribution System Representation in Dynamic Sub-Transmission-Distribution Co-Simulation

There has been a significant growth in the distributed energy resources (DERs) connected to distribution networks recent years, increasing need for modeling detail conjunction with sub-transmission/transmission networks. This paper models real distribution/ sub-transmission network using three-phase/three-sequence co-simulation. One of modeled feeders high penetration DERs reverse power flow and is including secondary network. Custom user-defined are used represent solar photovoltaic (PV) units on feeder advanced controls abnormal voltage responses from IEEE 1547–2018 standard. The co-simulation framework developed supports flow/steady state as well dynamic analysis. Using this framework, studies impact balanced unbalanced faults applied impacts studied terms PV tripping due under/overvoltages resulting change feeder-head flow. It seen that detailed needed accurately capturing response distribution-connected during fault events both