  This paper introduces a distributed operational solution for coordinating
integrated transmission-distribution (ITD) systems regarding data privacy. To
tackle the nonconvex challenges of AC optimal power flow (OPF) problems, our
research proposes an enhanced version of the Augmented Lagrangian based
Alternating Direction Inexact Newton method (ALADIN). This proposed framework
incorporates a second-order correction strategy and convexification, thereby
enhancing numerical robustness and computational efficiency. The theoretical
studies demonstrate that the proposed distributed algorithm operates the ITD
systems with a local quadratic convergence guarantee. Extensive simulations on
various ITD configurations highlight the superior performance of our
distributed approach in terms of convergence speed, computational efficiency,
scalability, and adaptability.
