Sari, Ruliana Puspita (2015) Perhitungan CCT (Critical Clearing Time) Berdasarkan Critical Trajectory Menggunakan Hilangnya Sinkronisasi Pada Sistem Multi Mesin Dengan Mempertimbangkan Kondisi Unbalance======Calculation Of CCT Based On Critical Trajectory Using Loss Of Synchronism In Multi Machine System By Considering Unbalanced Condition. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Perhitungan critical clearing time (CCT) merupakan hal yang
penting karena berhubungan dengan kestabilan sistem akibat gangguan
besar seperti hubung singkat. Bekerjanya pemutus daya untuk
mengisolasi gangguan tidak menjamin sistem akan kembali stabil. Sistem
akan kembali stabil apabila gangguan dihilangkan sebelum waktu
pemutus kritisnya dan sistem tidak stabil bila gangguan dihilangkan
setelah waktu pemutus kritisnya. Perhitungan CCT dengan numerical
simulation memberikan hasil yang akurat, namun memerlukan proses
iterasi yang lama dan nilai CCT yang diperoleh masih berada dalam range
stabil dan tidak stabil. Oleh karena itu, diusulkan metode baru untuk
memperoleh nilai CCT yakni dengan pendekatan critical trajectory.
Metode ini sangat efektif karena tidak memerlukan waktu lama (direct
method). Hampir semua gangguan hubung singkat yang terjadi pada
sistem tenaga adalah gangguan asimetri. Gangguan asimetri
menyebabkan arus berlebih pada fasa yang terkena gangguan sehingga
menyebabkan kondisi unbalance. Pada tugas akhir ini perhitungan CCT
dilakukan dengan metode hilangnya sinkronisasi akibat gangguan
asimetri. Hasil simulasi yang dilakukan menunjukkan bahwa nilai CCT
untuk tiap gangguan yang terjadi memiliki nilai hampir sama. Pada sistem
3 generator 9 bus Fouad dan Anderson tanpa damping nilai CCT yang
diperoleh pada semua jenis gangguan sekitar 0,21-0,22 detik, sedangkan
pada sistem 7 generator 57 bus IEEE tanpa damping nilai CCT yang
diperoleh pada semua jenis gangguan sekitar 0,10-0,11 detik.======================================================Calculation of critical clearing time (CCT) is important because it relates
to the stability of system as a result of major disturbances such as short
circuit. Breaker operation to remove disturbance does not guarantee the
system stability. If disturbance is eliminated before critical clearing time,
the system will return to stable state. Conversely, if the disturbance is
eliminated after critical time, the system becomes unstable. CCT obtained
by numerical simulation calculations provide accurate results, but require
a long process of iteration and CCT obtained are still in the range of stable
and unstable. Therefore, new method proposed to obtain CCT by
approach of critical trajectory. This method is very effective because it
does not require a long time (direct method). Almost all short circuit
occurred in power system is asymmetry fault. Asymmetry fault causes
excessive current in phase fault that causes an unbalanced condition. In
this final project calculation of CCT use loss of synchronism method by
considering the condition of unbalance caused by asymmetry fault. The
simulation results show CCT for each fault occurred approximately has
same value. CCT obtained in 3 generators 9 buses Fouad and Anderson
system without damping on each fault type is about 0,21-0,22 second,
while in 7 generators and 57 buses system without damping on each fault
type is about 0,10-0,11 second.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSE 621.312 Sar p |
| Uncontrolled Keywords: | [1] IEEE/CIGRE Joint Task Force on Stability Terms and Definitions, “Definition and Classification of Power System Stability,” IEEE Transaction on Power System, Vol.19, No.2, May. 2004. [2] Kundur, P, Power System Stability and Control. New York: McGraw-Hill, Inc, 1994. [3] Brilyan Muhammad, Dimas Anton Asfani, Ardyono Priyadi, Perhitungan CCT (Critical Clearing Time) Berdasarkan Trajectory Kritis Menggunakan Hilangnya Sinkronisasi pada Sistem 3 Generator 9 Bus yang Terhubung pada Infinite Bus, JURNAL TEKNIK POMITS Vol. 1, No. 1, (2013) 1-6, 2013 [4] Yorino, Naoto, Ardyono Priyadi, Hironori Kakui, dan Mitsuhiro Takeshita. A New Method for Obtaining Critical Clearing Time for Transient Stability. IEEE Transactions on Power Systems, Vol. 25, No. 3, August 2010. [5] Grainger, Jhon. J dan William D. Stevenson, JR, Power System Analysis. New York: McGraw-Hill, Inc, [6] Xuefeng Bai, T.Jiang, Z.Guo, Zheng Yan, Y.Ni, A Unified Approach to Processing Unbalanced Conditions in Transient Sstability Calculations. Proc. on Power Engineering Society General Meeting, Hong Kong, China. 2004. [7] J. Chapman, Stephen, Electric Machinery Fundamentals Fourth Edition, New York: McGraw-Hill, Inc, 2005. [8] J. Matsuki, T. Okada, C. Uenosono, Loss of Synchronous Generator Described by Its Internal Flux and Force Distributions, IEEE Transactions on Energy Conversion, Vol. 7, No.1, March 1992. [9] Athay T., R. Podmore, S. Virmani, A Practical Method for the Direct Analysis of Transient Stability, IEEE Transactions On Power System, Vol. PAS-98, No.2, March/April 1979 [10] Das, J.C., Transient in Electricl System, Analysis, Recognition, and Mitigation, McGraw-Hill, Inc, 2010, Transient stability analysis, critical clearing time (cct), ctritical trajectory, loss of synchronism, unbalance fault. |
| Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK201 Electric Power Transmission |
| Divisions: | Faculty of Industrial Technology > Electrical Engineering > 20201-(S1) Undergraduate Thesis |
| Depositing User: | ansi aflacha |
| Date Deposited: | 28 Mar 2018 02:25 |
| Last Modified: | 24 Aug 2018 06:48 |
| URI: | http://repository.its.ac.id/id/eprint/51648 |
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