Distributed Energy Resource Deployment to Mitigate Adverse Effects of High EV Penetration in Unbalanced Distribution System by Analytical Sensitivity-Based Optimization

Abstract

The rapid integration of electric vehicles (EVs) into distribution systems in response to environmental concerns poses challenges for power system operators. This article addresses the operational difficulties faced by unbalanced distribution systems (UDS) when incorporating three-phase EV loads. We propose a novel method for supporting EV integration and enhancing UDS operational indicators, including voltage unbalance, bus voltage stability, and bus voltage deviation. Our approach utilizes analytical loss sensitivity index (ALSI)-based meta-heuristic wild horse optimization for the optimal allocation of distributed energy resources (DERs) and capacitor bank during EV load connections. The ALSI is employed to identify potential DER locations, streamlining the computation process and reducing search space. Tested on a modified 123-bus UDS, the proposed method demonstrates a 76.71% reduction in total active power loss and a 96.43% reduction in total voltage deviation. The results underscore the effectiveness and applicability of the proposed approach. While showcasing promising outcomes, the article also discusses the potential limitations and implications for practical implementation.

Keywords:

• analytical loss sensitivity index
• plugged-in electric vehicles
• DER allocation strategy
• total active power loss
• total voltage deviation
• unbalanced distribution system stability
• voltage stability index

DISCLOSURE STATEMENT

No potential conflict of interest was reported by the authors.

Additional information

Notes on contributors

Sourav Mondal

Sourav Mondal is currently pursuing his Ph.D. degree from NIT Patna, India. He received his Bachelor degree from Hooghly Engineering and Technology College in 2015 and M.E in Power System from BIT, Mesra, Ranchi, in 2018. His current research interests are - Distribution system Analysis, Optimization, Demand Side Management of Unbalanced Distribution System and Distribution System Resiliency.

Mala De

Mala De has received her B.E in Electrical Engineering in 2000 from Jalpaiguri Govt Engg College, West Bengal. She has completed her M.Tech degree in Power and Energy Systems from NIT Silchar in 2007 and have earned her Ph.D. degree from Jadavpur University, West Bengal in 2012. She is currently working as an Associate Professor in the Department of Electrical Engineering at NIT Patna. She works in the domain of - Power system operation and control, Load forecasting and Demand Side Management of Smart Grid, Power System Resiliency and Power System Optimization.