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Journal : Jurnal Listrik, Instrumentasi, dan Elektronika Terapan

Analisis Pengaruh Ketidakseimbangan Beban dan Harmonisa Terhadap Arus Netral Pada Trafo Distribusi 8 Kapasitas 500 KVA di PPSDM Migas Cepu Riki Khomarudin; Lukman Subekti
Jurnal Listrik, Instrumentasi, dan Elektronika Terapan Vol 1, No 2 (2020)
Publisher : Departemen Teknik Elektro dan Informatika Sekolah Vokasi UGM

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/juliet.v1i2.59560

Abstract

Distribution transformer 8 at PPSDM Migas Cepu has a capacity of 500 kVA with load connected to boiler and refinery. The loading connected to the distribution transformer 8 is the majority of the 3-phase motor pump load and some 1-phase pump motors. In this case study measurements were made using the ampere pliers as the hypothesis of the current of each phase. From the measurement result there is imbalance of load between channel and also there is current value of neutral conductor side. And to know the content of harmonics on the distribution transformer, then measured with a power quality analyzer.The result of measurement with fluke quality 436 type fluke quality got result of measurement that current value at neutral conductor side equal to 14A. The value of load imbalance between conductor obtained by value of channel current R equal to 346A, in channel S equal to 306A, and in channel T equal to 318A. The THD value of the current obtained from the measurement with the power quality analyzer on the conductor side of R is 3.4%, on the conductor side S of 3.0%, and on the conductor side of T is 3.0%, and in the neutral channel is the greatest value of 29%. In the analysis of this chapter we get the result of imbalance loads of 4.6%, with the average loading of 45% of the total capacity of the transformer
Optimisasi Penjadwalan Pembangkit pada Microgrid dengan Mempertimbangkan Respons Beban Candra Febri Nugraha; Lukman Subekti
Jurnal Listrik, Instrumentasi, dan Elektronika Terapan Vol 3, No 1 (2022)
Publisher : Departemen Teknik Elektro dan Informatika Sekolah Vokasi UGM

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/juliet.v3i1.74669

Abstract

Abstract – In a smart grid, the adequacy of electricity supply is not only determined by generation, but the electrical demand can also be involved. Demand response is one way to maintain a balance between electricity supply and load by reducing electricity consumption at a certain period. In this study, a microgrid system operating design is proposed by considering the penetration of new and renewable energy and demand response. Optimization is carried out with the aim of obtaining the lowest generation costs, while maximizing customer benefits from the demand response program. The mixed-integer linear programming method is used to determine generator generation and customer load reduction throughout the planning period. The obtained diesel generator operating cost is $116.40 and the total customer load response benefit is $100. Based on the analysis, the demand response is able to help the system maintain a power balance in critical conditions, namely when the supply from the generator is not sufficient. From the test system used, it was found that the load curtailment throughout the planning  period is 67.04 kWh for three customers. The distribution of the reduced demand depends on the value of the demand response incentive for each customer. The amount of load reduction is strongly influenced by the specified demand response budget.Keywords – optimal dispatch, demand response, microgrid, mixed-integer linear programmingIntisari – Dalam smart grid, kecukupan pasokan listrik tidak hanya ditentukan oleh pembangkitan saja, tetapi beban listrik juga dapat dilibatkan. Respons beban merupakan salah satu cara untuk menjaga keseimbangan antara pasokan dan beban listrik dengan cara mengurangi pemakaian listrik pada waktu-waktu tertentu. Dalam studi ini diusulkan sebuah desain operasi sistem microgrid dengan mempertimbangkan penetrasi energi baru dan terbarukan serta respons beban. Optimisasi dilakukan dengan tujuan untuk memperoleh biaya pembangkitan terendah, sekaligus memaksimalkan keuntungan pelanggan dari program respons beban. Metode mixed-integer linear programming digunakan untuk menentukan pembangkitan pada generator dan pengurangan beban pelanggan sepanjang periode perencanaan. Biaya operasi pembangkit diesel yang diperoleh adalah $116,40 dan keuntungan respons beban yang diperoleh pelanggan sebesar $100. Berdasarkan analisis, respons beban mampu membantu sistem menjaga keseimbangan daya pada kondisi-kondisi kritis, yaitu ketika suplai dari pembangkit sedang tidak mencukupi. Dari sistem pengujian yang digunakan, diperoleh penurunan beban yang terjadi selama periode penjadwalan adalah 67,04 kWh pada tiga pelanggan. Distribusi beban yang dikurangi bergantung pada nilai insentif respons beban pada tiap-tiap pelanggan. Besarnya penurunan beban sangat dipengaruhi oleh anggaran respons beban yang ditetapkan.Kata kunci – penjadwalan pembangkit, respons beban, microgrid, pemrograman mixed-integer linear