Robust Dynamic Operating Envelopes in Unbalanced Three-Phase Distribution Systems
For distribution system operators, this provides a more reliable method to manage distributed energy resources while maintaining network safety.
This paper proposes a robust optimization formulation for dynamic operating envelopes (DOEs) in unbalanced three-phase distribution systems, ensuring network constraints are satisfied across the entire envelope range. The robust approach reduces constraint violations compared to conventional methods, with a trade-off in envelope size.
This paper proposes a robust optimization formulation to calculate dynamic operating envelopes (DOEs) to safely operate unbalanced three-phase distribution systems. Unlike conventional formulations that satisfy network constraints only at the envelope bound, the robust formulation covers the entire envelope range. We formulate a robust non-linear programming (NLP) problem with the full AC power flow equations, as well as an approximate linear programming (LP) model. Numerical simulations are run with real-world data from Belgium and two different distribution test feeders. The paper compares the conventional approaches with their robust counterparts and examines the trade-off between constraint violation and envelope size as well as accuracy and solve time aspects.