Safe Trajectory Sets for Online Operation of Power Systems under Uncertainty

TL;DR

This paper presents a method to ensure safe online operation of power systems by defining conditions for feedback controller trajectories within feasible operating regions, demonstrated on a sub-transmission system.

Contribution

It introduces a novel approach to evaluate controller safety and robustness using trajectory projections onto the PQ-plane, applicable to systems under disturbances.

Findings

Conditions for safe operation are effectively defined.

Method accurately evaluates controller robustness.

Applicable to real-time power system management.

Abstract

Flexibility provision from active distribution grids requires efficient and robust methods of optimization and control suitable to online operation. In this paper we introduce conditions for the safe operation of feedback optimization based controllers. We use the feasible operating region of a controlled system as bounds for safe system states and evaluate the trajectories of the controller based on the projection of the full system state onto the two-dimensional PQ-plane. We demonstrate the defined conditions for an exemplary sub-transmission system. We show that the proposed method is suitable to evaluate controller performance and robustness for systems subject to disturbances.