Efficient network fault analysis method for unbalanced microgrid systems
| Autor: | Nien-Che Yang, Wei-Jen Lee, Tsai-Hsiang Chen, Ting-Yen Hsieh |
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| Rok vydání: | 2018 |
| Předmět: |
Computer science
business.industry 020209 energy Triangular matrix Energy Engineering and Power Technology Graph theory Incidence matrix 02 engineering and technology Topology Fault (power engineering) Matrix (mathematics) Distributed generation 0202 electrical engineering electronic engineering information engineering Microgrid Electrical and Electronic Engineering business Representation (mathematics) |
| Zdroj: | International Journal of Electrical Power & Energy Systems. 103:89-101 |
| ISSN: | 0142-0615 |
| Popis: | A novel network short-circuit fault analysis method based on graph theory and a complex short-circuit MVA representation is proposed as an alternative method for unbalanced microgrid systems. The proposed algorithm is based on the branch-path incidence matrix K and the newly defined augmented incidence matrix K l of a power network, as opposed to the traditional Z-bus building algorithm and inverse Y-bus matrix with the lower and upper triangular matrix (LU) method. To simplify the unit transformation among different voltage levels, all network components are represented in a short-circuit MVA form with their own infinite bus. Moreover, two major types of distributed generation (DG) models have been successfully implemented using the proposed method; therefore, the contributions of DG to the fault currents can be easily addressed in a microgrid system. The results indicate that the proposed algorithm is accurate and performs better than other methods, particularly with respect to large-scale unbalanced microgrid distribution systems with hybrids of single-, two-, and three-phase. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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