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All Journal PROSIDING CSGTEIS 2013 JTET (Jurnal Teknik Elektro Terapan) Jurnal Nasional Teknik Elektro dan Teknologi Informasi
Avrin Nur Widiastuti
Universitas Gadjah Mada
Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering

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Penerapan Demand Side Management di Bengkel Mekanik Politeknik Negeri Semarang Dwiatmanto, Lukas Joko; Sarjiya, ; Widiastuti, Avrin Nur
JTET (Jurnal Teknik Elektro Terapan) Vol 1, No 3 (2012)
Publisher : Teknik Elektro - Politeknik Negeri Semarang

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Abstract

Kapasitas pasokan tenaga listrik dari PLN untuk Politeknik Negeri Semarang (Polines) pada keadaan tertentu tidak cukup. Sehingga diperlukan penataan pengoperasian beban-beban listrik agar pemanfaatan pasokan tenaga listrik cukup. Tujuan penelitian ini adalah untuk mendapatkan profil beban secara nyata yang dapat digunakan untuk penataan operasi beban yang lebih efektif, koreksi faktor daya,perbaikan instalasi dan evaluasi efisiensi beban listrik terpasang. Untuk mendapatkan profil beban nyata dengan cara pengukuran nilai besaran-besaran listrik selama lima hari kerja. Dengan pengamatan operasi nyata beban-beban listrik dapat diperoleh peluang untuk dilakukan penataan pengoperasian beban agar lebih efektif, perbaikan instalasi listrik dan koreksi faktor daya. Hasil ini dapat digunakan sebagai rujukan dalam upaya penanggulangan keterbatasan pasokan tenaga listrik terpasang.
Studi Kestabilan Tegangan Jaringan IEEE 9 Bus Menggunakan Indeks Kestabilan Tegangan Avrin Nur Widiastuti; Lesnanto Multa Putranto; Randhy Ramono Syamri
PROSIDING CSGTEIS 2013 CSGTEIS 2013
Publisher : PROSIDING CSGTEIS 2013

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Intisari — Sistem tenaga yang sangat terbebani sering terkendala oleh ketidakstabilan tegangan.Ketidakstabilan tegangan dapat menimbulkan banyak masalah, seperti jatuhnya tegangan pada sebagian besar sistem, keruntuhan tegangan (voltage collapse), bahkan potensi terjadinya blackout pada sistem.Pada penelitian ini simulasi berbasis waktu digunakan untuk mempelajari kestabilan tegangan sistem IEEE 9 bus. Penelitian ini menggunakan Indeks Kestabilan Tegangan (Voltage Stability Indeks, VSI) yang bertujuan untuk mengetahui tingkat kestabilan tegangan, memprediksi kapan terjadinya ketidakstabilan tegangan, dan mengetahui bagian sistem yang paling berpartisipasi atau rawanterhadap ketidakstabilan tegangan. Pada penelitian ini akan digunakan dua jenis indeks yaitu analisis modal dan PQVSI. Analisis modal menilai kestabilan tegangan dari eigenvalue matriks Jacobian tereduksi. Informasi dari eigenvektor matriks Jacobian tereduksi digunakan untuk mencari bus yang paling berpartisipasi terhadap kondisi ketidakstabilan tegangan yang dikenal dengan metodeFaktor Partisipasi Bus (FPB). Sedangkan PQVSI menilai kestabilan tegangan dengan membandingkan aliran daya suatu saluran pada waktu tertentu dengan batas aliran daya maksimalnya.Simulasi dilakukan dengan menggunakan 2 skenario. Skenario 1 dengan pemberian kenaikan beban sebesar 0,3 pu/detik pada bus 5. Hasil yang didapatkan system mulai menuju ketidakstabilan pada detik ke 12,83 yang ditandai dengan nilai eigenvalue mendekati nol (0,0121). Dengan FPB diketahui bahwa partisipasi terbesar adalah pada bus 5 dengan nilai 0,693.Dari analisis PQVSI didapatkan bahwa saluran dari bus 4 ke bus 5 merupakan saluran yang paling rawan menuju ketidakstabilan. Skenario 2 dengan pemberian kenaikan beban sebesar 2 pu pada bus 7. Hasil yang didapatkan system mulai menuju ketidakstabilan pada detik ke 23,92 yang ditandai dengan nilai eigenvalue mendekati nol (0,0013). Dengan FPB diketahui bahwa partisipasi terbesar adalah pada bus 7 dengan nilai 0,598.Dari analisis PQVSI diketahui bahwa saluran dari bus 7 ke bus 8 merupakan saluran yang paling rawan menuju ketidakstabilan.Kata kunci— Kestabilan tegangan, ketidakstabilan tegangan, indeks kestabilan tegangan, analisis modal, faktor partisipasi bus, PQVSI.
Evaluasi Keandalan Perencanaan Pembangkit Wilayah Jawa-Bali dengan Mempertimbangkan Ketidakpastian Peramalan Beban Avrin Nur Widiastuti; Sarjiya; Kukuh Arung Pinanditho; Eko Tri Prastyo
Jurnal Nasional Teknik Elektro dan Teknologi Informasi Vol 6 No 2: Mei 2017
Publisher : Departemen Teknik Elektro dan Teknologi Informasi, Fakultas Teknik, Universitas Gadjah Mada

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Abstract

Power system reliability is one of important aspects of power system operation. Lack of capacity in the generation system will affect reliability level of the power system. System evaluation needs to be done to know whether the system is still reliable to supply the load that is projected to increase 8.2% per year. Java-Bali system evaluation planning period 2015-2024 is conducted in this paper. Load forecast uncertainty (LFU) is one of the parameters that needs to be considered when conducting system planning. It is because load tends to be uncertain. This research uses two scenarios: without and with load forecast uncertainty. Reliability indexes LOLE and LOLP are used to evaluate the Java-Bali system. All calculations are based on a program using MATLAB. The result shows that reliability indexes LOLE and LOLP are higher with considering LFU. It means reliability decreases, rather than planning without considering LFU. Moreover, Java-Bali system reliability indexes meet the PLN’s standard value with the best value acquired in 2019.
Optimisasi PID pada Sistem Mesin Tunggal Terpasang STATCOM dengan Algoritme Flower Pollination Avrin Nur Widiastuti; Suseto Mahardiko; Sasongko Pramono Hadi
Jurnal Nasional Teknik Elektro dan Teknologi Informasi Vol 5 No 1: Februari 2016
Publisher : Departemen Teknik Elektro dan Teknologi Informasi, Fakultas Teknik, Universitas Gadjah Mada

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Abstract

Indonesia as a big country is facing electricity demand increase as the economy is intensively growing. Along with the economy growth, the electricity demand is also increasing. This should be balanced with the growth of power plants installed, but power plants can not be built in a short time. This growth may affect the stability. Stability is one of main problems of power system. Power system can be represented by simplifying it into Single Machine Infinite Bus (SMIB). Flexible AC Transmission System (FACTS) is one of the solutions to enlarge the capacity by compensating the reactive load. By installing the FACTS, the dynamic characteristic of power system also changes. The result shows that system has better dynamic response with FACTS than without FACTS. A proper control is subsequently needed for tackling those phenomenons, e.g. using PID-POD controller. In this type of controller, the PID constant is needed to be determined. Flower Pollination Algorithm (FPA) is then employed for solving such problem. As the newest metaheuristic method, FPA has shown better characteristic than other methods. The results show that FPA can be used as a method to find the optimal PID controller constant in a simple power sytem, such as SMIB.
Pengaruh Front Time terhadap Tegangan Residu Arester ZnO 18 kV Riky Dwi Puriyanto; Avrin Nur Widiastuti
Jurnal Nasional Teknik Elektro dan Teknologi Informasi Vol 2 No 4: November 2013
Publisher : Departemen Teknik Elektro dan Teknologi Informasi, Fakultas Teknik, Universitas Gadjah Mada

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Abstract

Electrical system in Indonesia has two main parts that cannot be separated, the source (provider) and the load (end user). Various attempts have been taken to comply with the load requirement, one of them is by creating a reliable system. The reliability of the system can be achieved by protecting component system from power disturbances, e.g., overvoltage (surge). The characteristic of an surge is hard to define. Overvoltage that travels in the transmission line is affected by the line impedance and may cause an alteration in the characteristics of the resulting waves. One of the alterations that may appear is front time value. This research presents a laboratory testing of an 18 kV Zinc- Oxide (ZnO) arrester with various front time values in the ra ngeof 0-30 μs. The various front time values can affect residual voltage with the average value which is equal to 39972.25 V for input voltage (Vpi) 60 kV and 42150 V for 100 kV. The increment of front time makes the value of residual voltage decrease, but the descent is not significant. The change of front time also can affect the residual voltage waveform as output of 18 kV ZnO arrester.
Analisis Skenario Permintaan dan Penyediaan Energi Listrik pada Sistem Interkoneksi Jawa-Madura-Bali 2050 Rahmat Adiprasetya Al Hasibi; Sasongko Pramono Hadi; Avrin Nur Widiastuti
Jurnal Nasional Teknik Elektro dan Teknologi Informasi Vol 2 No 1: Februari 2013
Publisher : Departemen Teknik Elektro dan Teknologi Informasi, Fakultas Teknik, Universitas Gadjah Mada

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Abstract

Scenario analysis of electricity supply to meet the demand of electricity is done by the support of LEAP software. Developed LEAP model used the base year of 2010 and the end year of 2050. In the model, scenario consisted of demand and supply side scenarios. In the demand side, designed scenario consisted of the reference and the conservation scenario. The reference scenario used to describe the demand of electricity without any introduction of conservation strategy. While in the conservation scenario, the strategy of energy conservation was integrated in the model. In the supply side, designed scenario consisted of the reference, the optimized, and the reduction of CO2 emission scenario. The reduction of CO2 emission scenario consisted of the implementation of nuclear power plant and renewable energy power plant. The result of the simulation showed that by the implementation of energy conservation strategy the demand of electricity in JAMALI system can be reduced by 20% compare to the reference scenario. The implementation of nuclear power plant can be used to reduce the CO2 emission with the growth of 3.26% per year. In the other hand, the implementation of renewable energy will reduce the CO2 emission with the growth of 3.14% per year.
Co-Authors Eko Tri Prastyo Kukuh Arung Pinanditho Lesnanto Multa Putranto Lukas Joko Dwiatmanto, Lukas Joko Mahardiko, Suseto Pinanditho, Kukuh Arung Prastyo, Eko Tri Puriyanto, Riky Dwi Rahmat Adiprasetya Al Hasibi Rahmat Adiprasetya Al Hasibi, Rahmat Adiprasetya Randhy Ramono Syamri Sarjiya Sasongko Pramono Hadi Suseto Mahardiko