TY - GEN
T1 - Dual-dVOC Based Controlled Negative Sequence Current Injection for Grid-Forming Inverters under Asymmetrical Grid Conditions
AU - Acharya, Arnab
AU - Ayyanar, Raja
N1 - Publisher Copyright:
© 2023 IEEE.
PY - 2023
Y1 - 2023
N2 - 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.
AB - 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.
KW - Dual-dVOC
KW - GFM
KW - negative sequence
KW - unbalancing
UR - http://www.scopus.com/inward/record.url?scp=85174678736&partnerID=8YFLogxK
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U2 - 10.1109/PESGM52003.2023.10252240
DO - 10.1109/PESGM52003.2023.10252240
M3 - Conference contribution
AN - SCOPUS:85174678736
T3 - IEEE Power and Energy Society General Meeting
BT - 2023 IEEE Power and Energy Society General Meeting, PESGM 2023
PB - IEEE Computer Society
T2 - 2023 IEEE Power and Energy Society General Meeting, PESGM 2023
Y2 - 16 July 2023 through 20 July 2023
ER -