Measuring Flexibility through Reduction Potential

TL;DR

This paper introduces the reduction potential matrix, a new method for quantifying electric vehicle load flexibility, demonstrated on commercial vehicle data, aiding stakeholders in leveraging EV flexibility for grid support.

Contribution

The paper presents a novel, easy-to-calculate reduction potential matrix for modeling EV flexibility, with application to commercial vehicle groups using simulated data.

Findings

Both freight vehicles and transit buses show substantial flexibility.

Flexibility properties differ significantly between vehicle groups.

The matrix helps stakeholders assess and utilize EV flexibility effectively.

Abstract

While electric vehicles (EVs) often exhibit substantial flexibility, harnessing this flexibility requires precise characterization of its timing and magnitude. This paper introduces the reduction potential matrix, a novel approach to EV load flexibility modeling which is both straightforward to calculate and intuitive to interpret. This paper demonstrates the approach by quantifying flexibility for two distinct commercial vehicle groups--freight vehicles and transit buses--using simulated charging data from Virginia. While both groups are found to have substantial flexibility, its properties vary across the groups. Naturally, this variability manifests in differences in each group's role as a grid resource. The paper concludes with a discussion on how system planners, fleet operators, and other stakeholders can use the matrix to assess and leverage EV flexibility.