A novel fault protection system using communication-assisted digital relays for AC microgrids having a multiple grounding system
| Autor: | Wei-Xiang Zhao, Yung-Ruei Chang, Shi-Lin Chen, Duong Minh Bui, Jheng-Lun Jiang, Yih-Der Lee, Keng-Yu Lien |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Engineering
business.industry 020209 energy 020208 electrical & electronic engineering Electrical engineering Energy Engineering and Power Technology 02 engineering and technology Protection system Earthing system Overcurrent law.invention Operation mode law 0202 electrical engineering electronic engineering information engineering Electronic engineering Microgrid Electrical and Electronic Engineering Digital protective relay business Power-system protection Transformer |
| Zdroj: | International Journal of Electrical Power & Energy Systems. 78:600-625 |
| ISSN: | 0142-0615 |
| DOI: | 10.1016/j.ijepes.2015.12.019 |
| Popis: | This paper develops a novel fault protection system for AC microgrids having a multiple grounding system. Communication-supported digital relays which have different protection modules are used for this novel microgrid protection system. The protection modules in a digital relay have various functionalities to protect AC microgrids from various fault types, such as: low/high-impedance ground faults and short-circuits. To effectively use the developed novel microgrid protection system, the first step is to reconfigure different microgrid structures into a standard microgrid configuration having a multiple-grounding system through using delta/wye-grounded or wye-grounded/wye-grounded transformers. Then, a fast–dependable–adaptable (FDA) fault protection algorithm is developed to protect AC microgrids from faults occurring at trunk lines, common buses or branch lines. At an islanded operation mode of AC microgrids, by using digital relays, a new protection module is designed to detect, locate, and classify the faults occurring at trunk lines and common AC buses, while other protection modules can use the existing protection methodologies (e.g. directional/non-directional overcurrent protection principles, etc.) to detect and clear the faults at source branches or load branches of the microgrids. At a grid-connected operation mode, standard overcurrent protection modules are applied for the FDA fault protection system. Simulation and experiment results obtained from various fault cases at a real low-voltage AC microgrid have validated the effective operation of the FDA fault protection system. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect