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Improved Control Strategy of Grid-Forming Inverters for Fault Ride-Through in a Microgrid System

Conference ·

This paper develops an improved control strategy of grid-forming (GFM) inverters with fault ride-through capabilities to guarantee the stable operation of microgrids under fault conditions, especially islanded microgrids and asymmetrical faults. The proposed control strategy includes the dual control of positive-sequence and negative-sequence control as well as the adaptive virtual impedance (VI) control. Unlike existing works, the proposed strategy applies the VI control for only the d component of the positive-sequence control and leaves the q component of the positive-sequence control and the dq component of the negative-sequence control as zero, thus achieving improved stability and balanced three-phase voltages under asymmetrical faults. The adaptive feature of the VI control guarantees the stability of the GFM inverter under severe faults, which could cause the saturation of the inner current loop and instability if the VI is not adaptive. Simulation results of various unbalanced faults with high- and low-fault impedances show that the proposed control strategy improves the stability of the GFM inverter and achieves stable and balanced output voltages in islanded microgrids. And the algorithm also improves the stability of GFM inverters under balanced faults with high- and low-fault impedances.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE National Renewable Energy Laboratory (NREL), Laboratory Directed Research and Development (LDRD) Program
DOE Contract Number:
AC36-08GO28308
OSTI ID:
1916450
Report Number(s):
NREL/CP-5D00-85115; MainId:85888; UUID:7ce3ea60-7f47-4b96-b454-8f6d7758acad; MainAdminID:68538
Resource Relation:
Conference: Presented at the 2022 IEEE Energy Conversion Congress and Exposition (ECCE), 9-13 October 2022, Detroit, Michigan; Related Information: 82049
Country of Publication:
United States
Language:
English

References (9)

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Grid Converters for Photovoltaic and Wind Power Systems December 2010
Sequence-Based Control Strategy With Current Limiting for the Fault Ride-Through of Inverter-Interfaced Distributed Generators journal January 2020
Reinforcing Fault Ride Through Capability of Grid Forming Voltage Source Converters Using an Enhanced Voltage Control Scheme journal October 2019
Design Power Control Strategies of Grid-Forming Inverters for Microgrid Application conference October 2021
Current Limitation Strategy For Grid-Forming Converters Under Symmetrical And Asymmetrical Grid Faults conference October 2020
Fault Ride-Through Capability of Voltage-Controlled Inverters journal October 2018
Experimental Evaluation of Grid-Forming Inverters Under Unbalanced and Fault Conditions
  • Gurule, Nicholas S.; Hernandez-Alvidrez, Javier; Darbali-Zamora, Rachid
  • IECON 2020 - 46th Annual Conference of the IEEE Industrial Electronics Society, IECON 2020 The 46th Annual Conference of the IEEE Industrial Electronics Society https://doi.org/10.1109/IECON43393.2020.9254562
conference October 2020
Grid-Forming Inverters: A Critical Asset for the Power Grid journal June 2020

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Related Subjects

POWER TRANSMISSION AND DISTRIBUTION
adaptive virtual impedance control
asymmetrical faults
fault ride-through
grid-forming inverter