Coordinated Voltage Regulator and Smart Inverter Settings with High Penetration of DERs: A Systematic Review and Bibliometric Analysis

The increasing penetration of Distributed Energy Resources (DER) in distribution systems presents unprecedented challenges to traditional voltage regulation methods. Conventional approaches, reliant on centralized voltage regulators, struggle to accommodate the variability and intermittency inherent in renewable energy sources. In response, this review explores the potential of coordinated voltage regulators and smart inverter settings to enhance voltage regulation in distribution grids with high levels of DER integration. By leveraging the advanced control capabilities of smart inverters and integrating them with existing voltage regulation infrastructure, grid operators can optimize voltage control strategies, mitigate voltage fluctuations, and improve overall system stability. Through a comprehensive examination of research studies, challenges, and future directions, this review elucidates the benefits, limitations, and opportunities associated with coordinated voltage regulation. This review aims to explore the state-of-the-art in coordinated voltage regulator and smart inverter settings, focusing on their roles, capabilities, and interactions in distribution systems with high levels of DER integration. Specifically, it examines the integration of smart inverters into existing voltage regulation frameworks, developing coordinated control strategies for voltage regulation, and the challenges and opportunities associated with their implementation.