Robust Transient Stability-Constrained Optimal Power Flow With Uncertain Dynamic Loads

Abstract

Load dynamics has a substantial impact on transient stability of a power system, but has not been properly treated in transient stability-constrained operational planning. This paper proposes a robust transient stability-constrained optimal power flow (OPF) model considering dynamic load models and uncertain variations in the model parameters (e.g., load composition). The uncertainty is modeled by selecting a small yet representative number of deterministic scenarios that approximate the whole uncertainty space. A decomposition-based solution approach is then developed, which iterates between a master problem corresponding to the ordinary OPF, and a set of subproblems corresponding to transient stability assessment and stabilization constraint generation. The proposed model and solution approach is validated on the New England 39-bus system. The obtained solutions can well immunize against random realizations of uncertain load model parameters while maintaining transient stability.