- Title
- A new current limiting and overload protection scheme for distributed inverters in microgrids under grid faults
- Creator
- Li, Zilin; Hu, Jiefeng; Chan, Ka Wing
- Date
- 2021
- Type
- Text; Journal article
- Identifier
- http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/180989
- Identifier
- vital:15867
- Identifier
-
https://doi.org/10.1109/TIA.2021.3104269
- Identifier
- ISBN:0093-9994 (ISSN)
- Abstract
- Unlike a synchronous generator that could withstand a large overcurrent, an inverter-based distributed generation (DG) has low thermal inertia, and the inverter is likely damaged by overcurrents during grid faults. In this article, a new strategy, namely positive-And negative-sequence limiting with stability enhanced P-f droop control (PNSL-SEPFC), is proposed to limit the output currents and active power of droop-controlled inverters in islanded microgrids. This strategy is easy to implement in the inverter controller and does not require any fault detection. Inverter stability is analyzed mathematically, which gives guidelines to design the parameters of the PNSL-SEPFC strategy. PSCAD/EMTDC simulation based on a four-DG microgrid shows that the proposed PNSL-SEPFC can limit inverter output currents and powers with better performance under both symmetrical and asymmetrical faults. Furthermore, hardware experiments demonstrate that the proposed PNSL-SEPFC can ensure the inverters riding through grid faults safely and stably. (A video of experimental waveforms is attached.). © 1972-2012 IEEE.
- Publisher
- Institute of Electrical and Electronics Engineers Inc.
- Relation
- IEEE Transactions on Industry Applications Vol. 57, no. 6 (2021), p. 6362-6374
- Rights
- All metadata describing materials held in, or linked to, the repository is freely available under a CC0 licence
- Rights
- Copyright © 2021 IEEE
- Subject
- 40 Engineering; 46 Information and Computing Sciences; Current limiting; Droop control; Fault-ride-Though capability; Grid-forming inverter; Transient stability
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