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Methods for Analysis and Mitigation of Resonances in DER-Rich Distribution Systems

Grant number: 23/13748-5
Support Opportunities:Scholarships in Brazil - Post-Doctoral
Effective date (Start): March 01, 2024
Effective date (End): February 28, 2026
Field of knowledge:Engineering - Electrical Engineering - Power Systems
Principal Investigator:Walmir de Freitas Filho
Grantee:Vinicius Braga Ferreira da Costa
Host Institution: Faculdade de Engenharia Elétrica e de Computação (FEEC). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
Associated research grant:21/11380-5 - CPTEn - São Paulo Center for the Study of Energy Transition, AP.CCD

Abstract

Electrical power distribution systems are undergoing significant changes, particularly with the increasing penetration of distributed energy resources (DERs), such as photovoltaic and wind generators, electric vehicles, and energy storage systems. These devices use power electronic-based technologies, which may present negative resistance characteristics at specific frequencies. Therefore, these DERs have the potential to decrease resonance damping in the electrical system and, consequently, damage circuit equipment and customer loads. This can create significant financial losses for the distribution utility and the end customer. As the high penetration of DERs in distribution systems is a relatively recent trend, it remains unclear what the main characteristics and most critical scenarios of these resonances are. Furthermore, there are no well-established methods to anticipate the risk of these problematic resonances and mitigate them. In this context, the goal of this project is to provide a detailed characterization of these resonances in DER-rich distribution systems and develop methods to predict the risk of occurrence of these problematic resonances and mitigate this risk, avoiding costly damage. The main focus is on developing systematic methods that can speed up the decision-making process of engineers in terms of what actions should be undertaken to avoid or eliminate resonances, either during system planning or operation. The results of this project can be used to reduce the risks and costs associated with technical losses and damage to devices, unplanned disconnection, reduction of equipment lifespan, number of man-hours required, and for improving the regulation of DERs integration.

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