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All Journal Majalah Ilmiah Teknologi Elektro
Adrianti Adrianti
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Electrical & Electronics Engineering

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Skema Pelepasan Beban Menggunakan Relai Rate of Change of Frequency dengan Supervisi Under Frequency Relay Adrianti Adrianti; Muhammad Nasir; Adiv Rama Salvayer
Jurnal Teknologi Elektro Vol 19 No 2 (2020): (Juli - Desember) Majalah Ilmiah Teknologi Elektro
Publisher : Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/MITE.2020.v19i02.P18

Abstract

A Rate of Change of Frequency (ROCOF) relay works based on rate of frequency changes (df/dt) that is a direct indicator of power unbalance between generation and demand. The df/dt indicator make ROCOF relays have a promising opportunity for under frequency load shedding. Examining the performance of the proposed ROCOF relay scheme for under frequency load shedding become the research objective. The proposed scheme consists of five load shedding steps and they were supervised by Under Frequency Relay (UFR) to avoid mal-operation due to short circuits. The scheme was assessed using generation loss simulation with contingency of N-1, N-2 and N-2-1 with Digsilent Powerfactory. It is found, for N-1 and N-2 contingencies, the proposed scheme provide better frequency results and faster than UFR scheme. However, there is a problem with the sensitivity of the scheme that is adjusted by delay setting. For light to medium power of generation loss, the required delay is relatively large to obtain the true df/dt value from the measured df/dt that tends to oscillate. However, for severe generation loss, the large delay setting causes the relay to be less sensitive hence a small proportion of the relays do not work at all expected steps.
Literature Review Skema Proteksi Jaringan Distribusi Yang Terhubung Dengan Pembangkit Tersebar Herris Yamashika; Syafii Syafii; Adrianti Adrianti; Aulia Aulia
Majalah Ilmiah Teknologi Elektro Vol 22 No 1 (2023): (Januari - Juni) Majalah Ilmiah Teknologi Elektro
Publisher : Program Studi Magister Teknik Elektro Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/MITE.2023.v22i01.P11

Abstract

Connecting distributed generation (DG) to the distribution network faces several challenges. One of them is related to the protection sistem scheme. The coordination of the existing protection sistem is unable to work properly with DG connected. Changes in short circuit current level, bidirectional power flow, blinding protection, false trip, and auto recloser failure are the problems presented in this paper. Several researchers have developed a protection scheme to overcome this problem. This article reviews some schemes that have been proposed previously. The article to be reviewed is only for AC sistems and does not include signal processing methods due to the complexity of the implementation stage. The protection scheme under review consists of adaptive scheme, differential scheme, distance relay scheme, voltage scheme, fault current limiter (FCL) scheme, and overcurrent protection scheme. The results of the review show that the proposed scheme has not considered DG with an inverter interface. The use of expensive communication channels is still a mainstay in adaptive and differential schemes. Transient problems due to DG connection and disconnection, as well as unbalanced loading, are also encountered. Keyword— distributed generation protection; AC microgrid; Distributed Generation/DG
Co-Authors Adiv Rama Salvayer Aulia Aulia Herris Yamashika Muhammad Nasir Syafii Syafii