Dual-dVOC Based Controlled Negative Sequence Current Injection for Grid-Forming Inverters under Asymmetrical Grid Conditions

Arnab Acharya, Raja Ayyanar

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

Abstract

The conventional synchronous machine-based power system, during any unbalanced condition, including asymmetrical faults, injects a negative sequence current which is sensed by the sequence-based relays to ensure the requisite protection. Similarly, grid-forming (GFM) inverters, acting as a controlled voltage source, are also expected to inject a fully controlled negative sequence current under similar asymmetrical conditions. The dispatchable Virtual Oscillator Control (dVOC) has emerged as a suitable decentralized control scheme for GFM inverters, that deals with the instantaneous time domain signals. Owing to its benefits, a sequence-based control strategy using a dual-dVOC loop is proposed for control of GFM inverters. The positive and negative sequence components are controlled in a fully decoupled way and finally added up to generate the final PWM signal. The dual-dVOC-based control architecture is validated with detailed PLECS simulations under asymmetrical grid conditions. The results illustrate that the proposed controller provides the flexibility to inject programmable negative sequence currents and extends the advantages of dVOC in terms of protection of GFM inverter-interfaced distributed generation system.

Original languageEnglish (US)
Title of host publication2023 IEEE Power and Energy Society General Meeting, PESGM 2023
PublisherIEEE Computer Society
ISBN (Electronic)9781665464413
DOIs
StatePublished - 2023
Event2023 IEEE Power and Energy Society General Meeting, PESGM 2023 - Orlando, United States
Duration: Jul 16 2023Jul 20 2023

Publication series

NameIEEE Power and Energy Society General Meeting
Volume2023-July

Conference

Conference2023 IEEE Power and Energy Society General Meeting, PESGM 2023
Country/TerritoryUnited States
CityOrlando
Period7/16/237/20/23

Keywords

  • Dual-dVOC
  • GFM
  • negative sequence
  • unbalancing

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Nuclear Energy and Engineering
  • Renewable Energy, Sustainability and the Environment
  • Electrical and Electronic Engineering

Fingerprint

Dive into the research topics of 'Dual-dVOC Based Controlled Negative Sequence Current Injection for Grid-Forming Inverters under Asymmetrical Grid Conditions'. Together they form a unique fingerprint.

Cite this