Bumpless Topology Transition

TL;DR

This paper introduces a comprehensive methodology for seamless topology transitions in transmission networks, ensuring AC feasibility and stability while optimizing control resources and line-switching sequences.

Contribution

It presents a novel convex mixed-integer programming approach combined with nonlinear recovery steps for bumpless topology transitions in power systems.

Findings

Method achieves bumpless transition with AC feasibility and stability.

Numerical studies demonstrate the effectiveness and superiority of the approach.

Optimizes line-switching sequences and control resources for smooth topology changes.

Abstract

The topology transition problem of transmission networks is becoming increasingly crucial with topological flexibility more widely leveraged to promote high renewable penetration. This paper proposes a novel methodology to address this problem. Aiming at achieving a bumpless topology transition regarding both static and dynamic performance, this methodology utilizes various eligible control resources in transmission networks to cooperate with the optimization of line-switching sequence. Mathematically, a composite formulation is developed to efficiently yield bumpless transition schemes with AC feasibility and stability both ensured. With linearization of all non-convexities involved and tractable bumpiness metrics, a convex mixed-integer program firstly optimizes the line-switching sequence and partial control resources. Then, two nonlinear programs recover AC feasibility, and optimize the remaining control resources by minimizing the $\mathcal{H}_2$-norm of associated linearized systems, respectively. The final transition scheme is selected by accurate evaluation including stability verification using time-domain simulations. Finally, numerical studies demonstrate the effectiveness and superiority of the proposed methodology to achieve bumpless topology transition.