Abstract
This paper describes a localized islanding detection approach based on a passive method for distributed generation (DG) coupled to the main power source. In the suggested approach, the change in phase angle difference (CIPA) between the positive sequence current and voltage is obtained at the DG side and is used to identify the islanding situation. The prevailing active detection techniques introduce deliberately disturbances into the system which might lead to problems related to power quality, stability, and reliability of the existing power system. On the contrary, passive methods based islanding detection techniques has the issue of large non-detection zone (NDZ). The proposed technique tries to overcome the NDZ problem and does not introduce any disturbances. PSCAD/EMTDC is used to simulate the two different systems. Various tests are carried out on these systems to access the execution of the proposed method and it was found that the suggested method has least NDZ and can detect the islanding in about 10 to 15 ms well below the time required by a recloser which is 150 ms.
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The data that I have used is taken from the reference Samui (2011).
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Appendix
Appendix
The following are the ratings for the various elements featured in the sample system:
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Generator: short-circuit rating = 1000 MVA, f = 50 Hz, rated kV = 120, Vbase = 120 kV.
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Distributed generators (DGs):
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(i)
DG-1, DG-2 and DG-3: wind farm (9 MW) with six 1.5-MW wind turbines. For the suggested technique, the doubly fed induction generator (DFIG) is used.
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(ii)
DG-4: diesel generator, 400 V and 5.0 MW.
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(i)
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Transformer TR-1: ratings: 50 MVA, f = 50 Hz and rated kV = 120/25 kV, Vbase = 25 kV, X1 = 0.1 pu, R1 = 0.00375 pu, Xm = 500 pu and Rm = 500 pu.
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Transformer TR-2, TR-3, TR-4 and TR-5: ratings: 10 MVA, f = 50 Hz and rated kV = 575 V/25 kV (excluding TR-5: 400 V/25 kV), Vbase = 25 kV, X1 = 0.1 pu, R1 = 0.00375 pu, Xm = 500 pu and Rm = 500 pu.
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Distribution lines (DL): DL-1, DL-2, DL-3, and DL-4: π-sections, having a length of 20 km each, rated kV = 25, rated MVA = 25 MVA, Vbase = 25 kV, R1 = 0.413 Ω/km, R0 = 0.1153 Ω/km, L1 = 3.32e−3 H/km, L0 = 1.05e−3 H/km, C1 = 5.01e−09 F/km and C0 = 11.33e−9 F/km.
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Normal loading data:
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L1 = 15 MW, 5 MVAr.
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L2, L3, L4 and L5 = 8 MW, 3 MVAr.
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Bashir, J., Jena, P. A Novel Islanding Detection Method in a Distributed Generation Using Change in Phase Angle Difference Between Positive Sequence Current and Voltage. Trans Indian Natl. Acad. Eng. 8, 149–159 (2023). https://doi.org/10.1007/s41403-022-00385-5
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DOI: https://doi.org/10.1007/s41403-022-00385-5