Electrical System Frequency Stability Study at PT Factory. Semen Tonasa After On-Grid With PLN

Sri Mawar Said; Indar Chaerah Gunadin; Fatimah Az-zahra; Sri Mawar Said; Indar Chaerah Gunadin; Fatimah Az-zahra

Jurnal

Electrical System Frequency Stability Study at PT Factory. Semen Tonasa After On-Grid With PLN

Studi Kestabilan Frekuensi Sistem Kelistrikan pada Pabrik PT. Semen Tonasa Setelah On-Grid Dengan PLN

Jurnal Eksitasi · Vol. 2 No. 2 (2023) · pp. 37–44

ISSN: 2829-5110
Published: 2023-12-26
Publisher: Departemen Teknik Elektro
Language: id

Abstract

English

PT. Semen Tonasa has switched to getting full supply from PLN from 2021 until now. On the other hand, as the largest cement producer in eastern Indonesia, PT. Semen Tonasa has motor loads that will affect frequency stability when connected to the system. Therefore, a frequency stability simulation was carried out using software to see how the system frequency responds when starting and releasing a large capacity motor. This research began with collecting data on PT's electrical system. Semen Tonasa, and the Sulbagsel system at the UIKL Sulawesi and UP2B Makassar offices. Data that includes motor and transformer load data at PT. Semen Tonasa, generator data, interbus, transmission line transformers, and Sulbagsel system loads are then input into the SLD that has been drawn in the application. The research then continued by carrying out frequency stability simulations with several scenarios. First Simulation, a power flow simulation was carried out in PT's electrical system. Semen Tonasa after being on-grid with PLN, the second simulation carried out a large capacity motor starting scenario, the third simulation carried out a large capacity motor disconnection scenario. The scenario results show the condition of all buses at PT. Semen Tonasa is in a stable condition after being on-grid with PLN to meet the permitted stress tolerance limits, namely -10% to +5%. When simulating starting a large capacity motor, the frequency drops to 49.924 Hz, this frequency is still within the permitted frequency limit. Apart from that, when starting 2 motors simultaneously the system frequency decreases to 49.875 Hz, and makes the system continue to oscillate but is still within the permitted frequency range. Then, when simulating the release of a large capacity motor, the frequency increased to 50,030 Hz, where the system frequency did not experience a significant increase. This shows that the system is able to maintain its stability when a disturbance occurs and is able to return to a new normal condition after the disturbance occurs

Bahasa Indonesia

PT. Semen Tonasa telah beralih untuk mendapatkan suplai penuh dari PLN sejak tahun 2021 hingga saat ini. Disisi lain, sebagai produsen semen terbesar di Indonesia timur, PT. Semen Tonasa memiliki beban-beban motor yang akan mempengaruhi stabilitas frekuensi pada saat dihubungkan ke sistem. Oleh karena itu, dilakukan simulasi kestabilan frekuensi menggunakan software untuk melihat bagaimana respon frekuensi sistem pada saat starting dan lepasnya motor berkapasitas besar. Penelitian ini dimulai dengan pengumpulan data sistem kelistrikan PT. Semen Tonasa, dan sistem Sulbagsel di kantor UIKL Sulawesi dan UP2B Makassar. Data yang mencakup data beban motor dan transformator pada PT. Semen Tonasa, data pembangkit, interbus, transformator saluran transmisi, dan beban sistem Sulbagsel kemudian di input pada SLD yang telah digambar pada aplikasi. Penelitian kemudian dilanjutkan dengan melakukan simulasi kestabilan frekuensi dengan beberapa skenario. Simulasi Pertama, dilakukan simulasi aliran daya pada sistem kelistrikan PT. Semen Tonasa setelah on-grid dengan PLN, simulasi kedua dilakukan skenario starting motor berkapasitas besar, simulasi ketiga dilakukan skenario lepasnya motor berkapasitas besar. Hasil skenario memperlihatkan kondisi semua bus pada PT. Semen Tonasa dalam keadaan stabil setelah on-grid dengan PLN memenuhi batas-batas toleransi tegangan yang diperbolehkan yaitu -10% hingga +5%. Ketika dilakukan simulasi starting motor berkapasitas besar frekuensi turun hingga 49,924 Hz, frekuensi ini masih dalam batas frekuensi yang diizinkan. Selain itu, ketika dilakukan starting 2 motor secara bersamaan frekuensi sistem mengalami penurunan hingga 49,875 Hz, dan membuat sistem terus berosilasi namun masih dalam rentang frekuensi yang diizinkan. Kemudian ketika dilakukan simulasi lepasnya motor berkapasitas besar frekuensi naik hingga 50,030 Hz, dimana frekuensi sistem tidak mengalami kenaikan yang signifikan. Hal ini menunjukkan bahwa sistem mampu untuk mempertahankan kestabilannya pada saat terjadi gangguan dan mampu untuk kembali ke kondisi normal yang baru setelah terjadinya gangguan

Keywords

Collaboration network of the authors

19 authors · 30 co-authorship links

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Co-author	Organisation	Joint articles
Zaenab Muslimin	Affiliation unknown	3
Yusri Syam Akil	Affiliation unknown	2
Yustinus Upa Sombolayuk	Affiliation unknown	2
Muammar Fadli Nur	Affiliation unknown	1
Fikran Fauzy	Affiliation unknown	1
Intan Sari Areni	Affiliation unknown	1
Ilham Ramli	Affiliation unknown	1
Faizal Arya Samman	Affiliation unknown	1
Harits Ghazy Ramadhan	Affiliation unknown	1
Muhammad Zhahran Zhafirin Irawan	Affiliation unknown	1
Muhammad Irsan Sadri	Affiliation unknown	1
Abd Rahim	Affiliation unknown	1
Firda Fajryani Kamil	Affiliation unknown	1
Caesar William Alexander	Affiliation unknown	1
Gassing	Affiliation unknown	1
Anugrah Agung Saputra	Affiliation unknown	1

Affiliations come from OpenAlex; journal OAI-PMH metadata carries none. Authors without an OpenAlex ID are matched by name, which can merge or split people.

Metadata source: OAI-PMH (metadata jurnal) https://journal.unhas.ac.id/index.php/eksitasi/oai, first harvested 2 Nov 2026, last seen 2 Nov 2026.

Original metadata (oai_dc)

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	<dc:title xml:lang="en">Electrical System Frequency Stability Study at PT Factory. Semen Tonasa After On-Grid With PLN</dc:title>
	<dc:title xml:lang="id">Studi Kestabilan Frekuensi Sistem Kelistrikan pada Pabrik PT. Semen Tonasa Setelah On-Grid Dengan PLN</dc:title>
	<dc:creator xml:lang="en">Sri Mawar Said</dc:creator>
	<dc:creator xml:lang="en">Indar Chaerah Gunadin</dc:creator>
	<dc:creator xml:lang="en">Fatimah Az-zahra</dc:creator>
	<dc:creator xml:lang="id">Sri Mawar Said</dc:creator>
	<dc:creator xml:lang="id">Indar Chaerah Gunadin</dc:creator>
	<dc:creator xml:lang="id">Fatimah Az-zahra</dc:creator>
	<dc:subject xml:lang="en">PT. Semen Tonasa has switched to getting full supply from PLN from 2021 until now. On the other hand, as the largest cement producer in eastern Indonesia, PT. Semen Tonasa has motor loads that will affect frequency stability when connected to the system. Therefore, a frequency stability simulation was carried out using software to see how the system frequency responds when starting and releasing a large capacity motor. This research began with collecting data on PT's electrical system. Semen Tonasa, and the Sulbagsel system at the UIKL Sulawesi and UP2B Makassar offices. Data that includes motor and transformer load data at PT. Semen Tonasa, generator data, interbus, transmission line transformers, and Sulbagsel system loads are then input into the SLD that has been drawn in the application. The research then continued by carrying out frequency stability simulations with several scenarios. First Simulation, a power flow simulation was carried out in PT's electrical system. Semen Tonasa after being on-grid with PLN, the second simulation carried out a large capacity motor starting scenario, the third simulation carried out a large capacity motor disconnection scenario. The scenario results show the condition of all buses at PT. Semen Tonasa is in a stable condition after being on-grid with PLN to meet the permitted stress tolerance limits, namely -10% to  5%. When simulating starting a large capacity motor, the frequency drops to 49.924 Hz, this frequency is still within the permitted frequency limit. Apart from that, when starting 2 motors simultaneously the system frequency decreases to 49.875 Hz, and makes the system continue to oscillate but is still within the permitted frequency range. Then, when simulating the release of a large capacity motor, the frequency increased to 50,030 Hz, where the system frequency did not experience a significant increase. This shows that the system is able to maintain its stability when a disturbance occurs and is able to return to a new normal condition after the disturbance occurs</dc:subject>
	<dc:subject xml:lang="en">PT. Semen Tonasa</dc:subject>
	<dc:subject xml:lang="en">Frequency Stability</dc:subject>
	<dc:subject xml:lang="en">motor starting</dc:subject>
	<dc:subject xml:lang="en">motor release</dc:subject>
	<dc:subject xml:lang="id">PT. Semen Tonasa</dc:subject>
	<dc:subject xml:lang="id">Kestabilan Frekuensi</dc:subject>
	<dc:subject xml:lang="id">starting motor</dc:subject>
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	<dc:description xml:lang="en">PT. Semen Tonasa has switched to getting full supply from PLN from 2021 until now. On the other hand, as the largest cement producer in eastern Indonesia, PT. Semen Tonasa has motor loads that will affect frequency stability when connected to the system. Therefore, a frequency stability simulation was carried out using software to see how the system frequency responds when starting and releasing a large capacity motor. This research began with collecting data on PT's electrical system. Semen Tonasa, and the Sulbagsel system at the UIKL Sulawesi and UP2B Makassar offices. Data that includes motor and transformer load data at PT. Semen Tonasa, generator data, interbus, transmission line transformers, and Sulbagsel system loads are then input into the SLD that has been drawn in the application. The research then continued by carrying out frequency stability simulations with several scenarios. First Simulation, a power flow simulation was carried out in PT's electrical system. Semen Tonasa after being on-grid with PLN, the second simulation carried out a large capacity motor starting scenario, the third simulation carried out a large capacity motor disconnection scenario. The scenario results show the condition of all buses at PT. Semen Tonasa is in a stable condition after being on-grid with PLN to meet the permitted stress tolerance limits, namely -10% to +5%. When simulating starting a large capacity motor, the frequency drops to 49.924 Hz, this frequency is still within the permitted frequency limit. Apart from that, when starting 2 motors simultaneously the system frequency decreases to 49.875 Hz, and makes the system continue to oscillate but is still within the permitted frequency range. Then, when simulating the release of a large capacity motor, the frequency increased to 50,030 Hz, where the system frequency did not experience a significant increase. This shows that the system is able to maintain its stability when a disturbance occurs and is able to return to a new normal condition after the disturbance occurs</dc:description>
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