Analyzing the Impact of EV Battery Charging on the Distribution Network

TL;DR

This paper reviews how increasing EV adoption impacts distribution networks, focusing on voltage stability, power quality, and strategies to manage charging loads and bidirectional power flow.

Contribution

It provides a comprehensive overview of EV charging impacts on distribution systems, charger topologies, and management strategies to mitigate grid issues.

Findings

Uncoordinated EV charging causes voltage instability and peak load increases.

Different EV charger topologies affect power quality and grid stability.

Strategies for load management and bidirectional flow improve grid resilience.

Abstract

Many countries are rapidly adopting electric vehicles (EVs) due to their meager running cost and environment-friendly nature. EVs are likely to dominate the internal combustion (IC) engine cars entirely over the next few years. With the rise in popularity of EVs, adverse effects of EV charging loads on the grid system have been observed. Since the distribution system (DS) does not cope with the high overloading capacity, the negative impact of EV charging load on the distribution network (DN) cannot be neglected. A high level of EV penetration with uncoordinated charging is the primary cause of voltage instability, increased peak load demand, and reliability issues of the DN. In this paper, a detailed overview of all the notable impacts of EV charging on voltage profile, power quality, and DS performance is discussed. This work also reviews the different topologies of EV chargers and the issues introduced by power converters on the utility grid. Finally, the strategies for improving the charging of EVs proposed in the literature to consider the random nature of EVs charging, the management of peak loads, and bidirectional power flow are summarized.