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"In electric power systems that consist of some generators, electric power stability in supplies sidebecomes the most important problems, which must be paid attention. In the interconnection system, ifthere are some troubles in transmission, generator or load will cause another generators feel theexistence of instability condition. For instability condition which not too serious, system can overcomethe fault and will not influence stability of system as a whole. However, for in big scale of fault andhappened in a long duration can be ejected system becoming unstable and will result hampered ofelectrics energy supply to the load For the worst condition could be blackout condition.This article studies about improvement of the stability of the system by using excitation current andthe prime mover of generators, which is coordinated fuzzy logic control in synchronize generator. Byusing annexation from three methods above, the condition of stability of the power system can attain thestability. The transient stability needed control in order that system with good stability can return tonormal condition. Faulted electric power system often caused by failure in controlling the transientstability. It is because in transient stability forms critical condition for electrical power system. By controlling the level of excitation current and mechanical energy from the prime mover ofgenerators which controlled by fuzzy logic when the fault is happened will make acceleration areabecome decreasing and deceleration area become increasing with the result that system can be stablequickly. It visible that from result of simulation obtained if using generator oscillation of fuzzy logiccontrol, transient period becoming shorter and amplitude of oscillation wave is smaller compare by usingwithout fuzzy logic. Likewise, this method is able loo to overcome transient condition at starting period ofa generator."

"Dalam sistem tenaga listrik, penyaluran tenaga listrik yang baik merupakan hal yang vital dalam memenuhi kebutuhan beban. Pada sistem tenaga listrik Jawa Bali, terdapat permasalahan dalam transmisi tenaga listrik dari timur ke barat Jawa, yaitu ketidakseimbangan pembebanan jalur utara (Sirkit Ungaran-Mandiracan 1&2) dan jalur selatan (Sirkit Pedan-Tasik & sirkit Pedan-Kesugihan-Tasik) karena perbedaan impedansi saluran, juga masalah penurunan tegangan pada sisi barat Jawa. Permasalahan tersebut bisa diselesaikan dengan memasang UPFC pada sistem tenaga listrik Jawa Bali. Hasil simulasi menunjukkan bahwa pemasangan UPFC pada sirkit Pedan-Tasik dapat membantu meningkatkan transfer jalur selatan sampai sebesar 5% dan menurunkan transfer jalur utara sampai sebesar 5% untuk semua skenario transfer. Peningkatan nilai tegangan pada sisi barat Jawa yaitu region 1 dan 2 juga bisa didapat. Kestabilan sistem setelah terjadi gangguan juga bisa dicapai dalam waktu yang lebih singkat jika dibandingkan dengan sistem tanpa UPFC.

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In electric power system, a good power transmission is vital in meeting the needs of the load. In Java Bali electric power system, there are problems in the transmission of electric power from east to west of Java, namely the loading imbalance of north transmission line (Ungaran-Mandiracan 1 & 2) and the south transmission line (Pedan-Tasik & Pedan-Kesugihan-Tasik) because of differences in line impedance, also the voltage drop problem on the west side of Java. Those problems can be solved by using the UPFC in the Java-Bali power system. The simulation results show that UPFC installation on Pedan-Tasik circuit can improve the transfer of the south transmission line up to 5% and lower the transfer of north transmission line up to 5% for all transfer scenarios. Increasing the voltage on the western side of Java, the region 1 and 2, can also be obtained. In addition, the stability of the system after an interruption can be achieved in a shorter time compared to system without UPFC."

"Fotovoltaik dikenal sebagai sumber energi intermiten sehingga dampak Kestabilan Tegangan perlu dihitung dengan baik oleh para pengembang Fotovoltaik (PV). Untuk memastikan pemasangan PV tidak menyebabkan keandalan sistem terganggu, pengembang PV diharuskan untuk melakukan studi stabilitas Kestabilan Tegangan pada jaringan setelah hubungan Integrasi PV. Dalam simulasi ini, studi stabilitas tegangan dilakukan dengan menggunakan berbagai kapasitas PV mulai dari 5 MWp, 10 MWp, 15 MWp. Studi dilakukan dalam sistem dengan kapasitas mampu 123 MW dengan pertimbangan bahwa pada manajemen jaringan dmungkinkan hingga 35 dari produksi listrik berupa sumber energi intermiten. Radiasi matahari yang digunakan adalah pada saat kondisi paling maksimum pada kapasitasnya. Analisis menunjukkan sistem stabil dalam waktu rata-rata kurang dari 50 detik di mana gangguan tegangan tidak melebihi 10 untuk PLTS berkapasitas 5 dan 10 MWp yang dihubungkan dengan jaringan distribusi. Sementara itu PLTS berkapasitas 15 MWp memerlukan pelebasan beban agar sistem dapat kembali stabil.

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Photovoltaic is known as an intermittent energy source so that Kestabilan Tegangant impact needs to be well calculated by the Photovoltaic (PV) developer. In order to ensure the presence of PV does not cause the reliability of the system interrupted, PV developers are required to perform the Kestabilan Tegangant stability study of the network after the PV generation source linkage. In this simulation, voltage stability studies are carried out using various PV capacities ranging from 5 MWp, 10 MWp, 15 Mwp on a systems with a capable capacity of 168.6 MW given that sufficient grid management would allow up to 35 of the electric production to be intermittent. Solar radiation that used is at the maximum conditions in its capacity. The analysis shows that the system is stable in an average time of less than 50 seconds where the voltage disturbance does not exceed 10 for PLTS with a capacity of 5 and 10 MWp which is connected to a distribution network. Meanwhile PLTS with a capacity of 15 MWp requires load release to stable again."