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http://hdl.handle.net/10397/93388
Title: | An adaptive fault ride-through scheme for grid-forming inverters under asymmetrical grid faults | Authors: | Li, Z Chan, KW Hu, J Or, SW |
Issue Date: | Dec-2022 | Source: | IEEE transactions on industrial electronics, Dec. 2022, v. 69, no. 12, p. 12912-12923 | Abstract: | Three-phase four-wire (3P4W) grid-forming (GFM) inverters are promising to interface distributed energy resources (DERs) into low-voltage networks. However, these inverters are prone to overcurrent under grid faults. Physically increasing the inverter current capacity is not cost-effective to cope with complicated fault conditions. In this paper, an adaptive fault ride-through (FRT) scheme based on instantaneous saturators and virtual negative- and zero-sequence resistances is proposed. It features not only overcurrent limitation by modifying voltage references but also seamless transition between normal and grid fault conditions. The proposed FRT scheme is first analyzed from different aspects, including the virtual sequence resistances, grid short-circuit ratio (SCR), fault types, and fault levels. The virtual sequence resistances are then designed to be adaptive to ensure high voltage quality at the healthy phase. The proposed FRT scheme is verified by MATLAB/Simulink simulations under asymmetrical faults. A laboratory platform with a grid-connected 3kW GFM inverter is further constructed to demonstrate its effectiveness. (A video of the experimental results under three asymmetrical faults is attached) | Keywords: | Asymmetrical faults Circuit faults Current limiting Fault ride-through Grid-forming inverter Impedance Inverters Limiting Power system stability Synchronization Three-phase four-wire Virtual impedance Voltage control |
Publisher: | Institute of Electrical and Electronics Engineers | Journal: | IEEE transactions on industrial electronics | ISSN: | 0278-0046 | EISSN: | 1557-9948 | DOI: | 10.1109/TIE.2021.3135641 | Rights: | © 2021 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for Publishedertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. The following publication Z. Li, K. W. Chan, J. Hu and S. W. Or, "An Adaptive Fault Ride-Through Scheme for Grid-Forming Inverters Under Asymmetrical Grid Faults," in IEEE Transactions on Industrial Electronics, vol. 69, no. 12, pp. 12912-12923, Dec. 2022 is available at https://dx.doi.org/10.1109/TIE.2021.3135641. |
Appears in Collections: | Journal/Magazine Article |
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Li_Adaptive_Fault_Ride-Through.pdf | Pre-Published version | 6.36 MB | Adobe PDF | View/Open |
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