Storage-Based Frequency Shaping Control

TL;DR

This paper introduces a novel energy storage control strategy called frequency shaping control that eliminates the frequency Nadir, simplifies security assessment, and reduces peak power requirements compared to traditional methods.

Contribution

The paper proposes a new frequency shaping control strategy for energy storage that completely eliminates the frequency Nadir and reduces peak power needs, enhancing frequency security.

Findings

Eliminates frequency Nadir, improving frequency security.

Reduces peak power requirements by up to 40%.

Simplifies frequency security assessment to algebraic calculations.

Abstract

With the decrease in system inertia, frequency security becomes an issue for power systems around the world. Energy storage systems (ESS), due to their excellent ramping capabilities, are considered as a natural choice for the improvement of frequency response following major contingencies. In this manuscript, we propose a new strategy for energy storage -- frequency shaping control -- that allows to completely eliminate the frequency Nadir, one of the main issue in frequency security, and at the same time tune the rate of change of frequency (RoCoF) to a desired value. With Nadir eliminated, the frequency security assessment can be performed via simple algebraic calculations, as opposed to dynamic simulations for conventional control strategies. Moreover, our proposed control is also very efficient in terms of the requirements on storage peak power, requiring up to 40% less power than conventional virtual inertia approach for the same performance.