A Pre-synchronization Strategy for Grid-forming Virtual Oscillator Controlled Inverters

Minghui Lu, Soham Dutta, Victor Purba, Sairaj Dhople, Brian Johnson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Voltage controlled inverters in ac systems are susceptible to damage if the controller is not properly initialized before startup. Since currents are not controlled explicitly, the voltage reference of the controller must be closely aligned with the point of common coupling voltage to prevent large current transients when power delivery begins. In this paper, we are focused on a particular control strategy called virtual oscillator control and propose a pre-synchronization method that guarantees graceful addition of units into an existing ac system. The proposed method is generalized and can be used to add oscillator-controlled inverters to a stiff grid or an islanded microgrid with other inverters. An equivalent circuit model of the pre-synchronization control is derived along with its dynamical properties, design guidelines are given, and experimental results are shown for a 1.5kW inverter.

Original languageEnglish (US)
Title of host publicationECCE 2020 - IEEE Energy Conversion Congress and Exposition
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages4308-4313
Number of pages6
ISBN (Electronic)9781728158266
DOIs
StatePublished - Oct 11 2020
Event12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020 - Virtual, Detroit, United States
Duration: Oct 11 2020Oct 15 2020

Publication series

NameECCE 2020 - IEEE Energy Conversion Congress and Exposition

Conference

Conference12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020
CountryUnited States
CityVirtual, Detroit
Period10/11/2010/15/20

Bibliographical note

Funding Information:
This material is based upon work supported by the U.S. Department of Energy’s Office of Energy Efficiency and Renewable Energy (EERE) under Solar Energy Technologies Office (SETO) Agreement Number EE0009025, the National Science Foundation through grant 1509277, and Washington Research Foundation.

Publisher Copyright:
© 2020 IEEE.

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