Impact of Medium and Heavy-Duty Electric Vehicle Electrification on Distribution System Stability

TL;DR

This paper examines how large-scale electric vehicle charging stations for medium and heavy-duty trucks affect the stability of distribution systems, highlighting the need for infrastructure upgrades to support electrification goals.

Contribution

It provides a detailed analysis of the impact of megawatt-scale charging loads on distribution system stability using real data and a benchmark IEEE system.

Findings

Significant voltage violations observed at various nodes.

Large infrastructure upgrades needed for future EV charging demands.

Implications for distribution system planning and resilience.

Abstract

Medium and heavy-duty (MHD) commercial vehicles contribute significantly to carbon emissions, accounting for 21\% of the total emissions in the transportation sector. To curb this, U.S. government is increasingly focusing on achieving 100\% fleet electrification over the next decade. However, the integration of megawatt-scale charging stations designed for MHD vehicles poses challenges to the stability of secondary distribution systems. This study investigates the impact of megawatt-scale charging station loads on a benchmark IEEE 33-bus distribution system using real data from the HEVI-LOAD software for MHD electrification planning developed by Lawrence Berkeley National Laboratory (LBNL). The results reveal significant violations of per-unit (p.u.) voltage values at various nodes of the distribution system, indicating that substantial upgrades to the distribution infrastructure will be necessary to accommodate the projected MHDEV charging loads and meet electrification targets.