Novel Protection Scheme considering Tie Switch Operation in an Open-Loop Distribution System using Wavelet Transform
Abstract
:1. Introduction
- The possibility of mal-operation of the protective relay after closing of the tie switch in the open loop distribution system is analyzed.
- To prevent this mal-operation, a new index to classify the normal load current supply and the fault current injection using the WT is proposed.
- A novel protection scheme using the new index is proposed.
2. Wavelet Transform
3. Mal-Operation Possibility of Protection Relay according to the Tie Switch Operation in the Open-Loop Distribution System
4. Novel Protection Scheme using Wavelet Transform in the Open-Loop Distribution System
4.1. Characteristics of the Normal Load Current Supply and Fault Current Injection according to the Operation of the Tie Switch in the Open-Loop Distribution System
4.2. New Index to Classify the Normal Load Current Supply and Fault Current Injection Using Wavelet Transform
4.3. Selection of Mother Wavelet
4.4. Protection Scheme using Wavelet Transform in an Open Loop Distribution System
- No additional communication facilities are required among fault lines, tie switches, and healthy distribution lines.
- The nature functions of the OCR are also included, so that it can be operated correctly regardless of the fault locations.
5. Simulations
5.1. System Model
5.2. Simulation Conditions
5.3. Simulation Results and Discussion
6. Conclusions
Funding
Conflicts of Interest
References
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MW | Maximum Value | Time Required to Reach the Maximum Value | |||
---|---|---|---|---|---|
Fault | No Fault | Difference | Fault (s) | No Fault (s) | |
Haar | 15220 | 3190 | 12030 | 0.2165 | 0.0165 |
Db4 | 392.5 | 57.2 | 335.3 | 0.2134 | 0.0134 |
Sym5 | 574.9 | 121.3 | 453.6 | 0.2132 | 0.0132 |
Bior3.1 | 953.3 | 122 | 831.3 | 0.2145 | 0.0145 |
Coif4 | 694.3 | 109.4 | 584.9 | 0.2095 | 0.0095 |
Case | Tie Switch Position | Fault Location at X Distribution Line | Fault Section Separation |
---|---|---|---|
Case 1 | Tie switch (1) | 102 section | Success |
Case 2 | Tie switch (1) | 102 section | Failure |
Case 3 | Tie switch (1) | 105 section | Success |
Case 4 | Tie switch (1) | 105 section | Failure |
Case 5 | Tie switch (2) | 102 section | Success |
Case 6 | Tie switch (2) | 102 section | Failure |
Case 7 | Tie switch (2) | 107 section | Success |
Case 8 | Tie switch (2) | 107 section | Failure |
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Seo, H.-C. Novel Protection Scheme considering Tie Switch Operation in an Open-Loop Distribution System using Wavelet Transform. Energies 2019, 12, 1725. https://doi.org/10.3390/en12091725
Seo H-C. Novel Protection Scheme considering Tie Switch Operation in an Open-Loop Distribution System using Wavelet Transform. Energies. 2019; 12(9):1725. https://doi.org/10.3390/en12091725
Chicago/Turabian StyleSeo, Hun-Chul. 2019. "Novel Protection Scheme considering Tie Switch Operation in an Open-Loop Distribution System using Wavelet Transform" Energies 12, no. 9: 1725. https://doi.org/10.3390/en12091725