Frequency shaping control for weakly-coupled grid-forming IBRs

TL;DR

This paper introduces a new frequency shaping control method for inverter-based resources in low-inertia power systems, improving frequency stability and robustness while relaxing previous assumptions.

Contribution

The paper presents a novel grid-forming control strategy that shapes frequency response, addressing tradeoffs and robustness issues in weakly-coupled inverter-based power systems.

Findings

Effective frequency stabilization in low-inertia systems

Tradeoff analysis between power peaks and frequency deviations

Robustness to network parameter estimation errors

Abstract

We consider the problem of controlling the frequency of low-inertia power systems via inverter-based resources (IBRs) that are weakly connected to the grid. We propose a novel grid-forming control strategy, the so-called frequency shaping control, that aims to shape the frequency response of synchronous generators (SGs) to load perturbations so as to efficiently arrest sudden frequency drops. Our solution relaxes several existing assumptions in the literature and is able to navigate tradeoffs between peak power requirements and maximum frequency deviations. Finally, we analyze the robustness to imperfect knowledge of network parameters, while particularly highlighting the importance of accurate estimation of these parameters.