An approach for the aggregation of power system controllers with different topologies

TL;DR

This paper introduces a linear frequency response-based method to aggregate diverse power system controllers into a single equivalent, maintaining their dynamic behavior for efficient simulation and stability analysis.

Contribution

It presents a novel approach for controller aggregation that preserves dynamical characteristics using linear operations on frequency response data.

Findings

Accurately reproduces original controllers' input-output behavior

Reduces computational burden in dynamic simulations

Validates method on a real interconnected power system model

Abstract

This paper proposes an approach to aggregate nonstructured power system controllers preserving the dynamical characteristics of the original devices. The method is based on linear operations that use the frequency response of the elements, resulting in an accurate input-output description of the equivalent controller when compared to the original ones. The developed method was applied to a model of the future interconnected Paraguayan-Argentinean power system to produce a dynamic equivalent used in a real-time simulator to test the special protection scheme needed for the safe operation of the this future system. Transient and small-signal stability studies presented matching simulation results in the time domain with significantly reduced computational burden and processing time.