Battery Energy Storage System (BESS) untuk Alokasi Energi Pengereman Regeneratif pada Sistem Kereta Api Elektrik

Saputra, Mohammad Bagas (2023) Battery Energy Storage System (BESS) untuk Alokasi Energi Pengereman Regeneratif pada Sistem Kereta Api Elektrik. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Selama pengereman kereta menghasilkan energi regeneratif yang ditandai oleh adanya arus negatif dari motor induksinya. Dimana pada fase ini motor induksi seolah-olah bertindak sebagai generator yang mengenerasi sejumlah energi regeneratif. Namun dalam praktiknya energi regeneratif ini hanya didisipasikan menuju rangkaian resistor khusus karena dinilai dapat mengganggu rangkaian elektrik kereta. Untuk itu diusungkan sebuah penelitian untuk mendesain Battery Energy Storage System (BESS) yang dapat mengalokasi regeneratif selama pengereman dan menggunakannya kembali. Penelitian diawali dengan memodelkan motor induksi beserta vector control untuk mengendalikan kecepatan motor sesuai yang diinginkan. Setelah dipastikan motor bekerja sesuai, dirancang BESS dengan spesifikasi baterai 750V 21A. Rangkaian DC-DC konverter dirancang untuk mengatur aliran daya dua arah dan pengendali PI untuk mengatur mode baterai. Hasil uji pengendali memberikan performansi layak dengan settling time 1.5 detik dan error steady state sekitar 0.3% dengan overshoot 0.3%. Simulasi menunjukkan bahwa ketika motor mengalami akselerasi BESS mengondisikan baterai pada mode discharging, sehingga SOC turun dari 40% menjadi 39.94% selama 10 detik simulasi. Arus terbaca 21 A menunjukkan adanya muatan mengalir dari terminal positif baterai ke terminal negatif, berarti aliran daya mengalir keluar dari baterai. Aliran arus keluar ini menurunkan tegangan dari 805 V menjadi 796 V. Sebaliknya ketika pengereman BESS mengondisikan baterai pada mode charging, sehingga SOC naik dari 39.94% menjadi 40%. Arus terbaca -21A menunjukkan aliran muatan mengalir dari terminal negatif ke terminal positif, berarti aliran daya mengalir masuk kedalam baterai. Aliran arus masuk ini menaikan tegangan baterai dari 796 V menjadi 812 V.
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During braking, the train produces regenerative energy characterized by the presence of negative current from its induction motor. Where in this phase the induction motor seems to act as a generator that generates a certain amount of regenerative energy. However, in practice, this regenerative energy is only dissipated to a special resistor circuit because it is considered to interfere with the train's electrical circuit. For this reason, a study was proposed to design a Battery Energy Storage System (BESS) that can allocate regeneratives during braking and reuse it. The study began by modeling the induction motor along with vector control to control the motor speed as desired. After confirming that the motor is working properly, BESS is designed with 750V 21A battery specifications. The DC-DC circuit of converters is designed to regulate bidirectional power flow and the PI controller to regulate the battery mode. The control test results provide decent performance with a settling time of 1.5 seconds and a steady state error of about 0.3%. The simulation showed that when the motor accelerates BESS conditions the battery in discharging mode, so the SOC drops from 40% to 39.94% for 10 seconds of simulation. A reading current of 21A indicates that a charge is flowing from the positive terminal of the battery to the negative terminal, meaning that a stream of power is flowing out of the battery. This outflow lowers the voltage from 805 V to 796 V. Conversely, when braking BESS conditions the battery in charging mode, so the SOC rises from 39.94% to 40%. A current reading of -21 A indicates a flow of charge flowing from the negative terminal to the positive terminal, meaning that a stream of power flows into the battery. This inflow increases the battery voltage from 796 V to 812 V.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	BESS, Regenerative Braking, Kereta, Train
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK2785 Electric motors, Induction.
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Physics Engineering > 30201-(S1) Undergraduate Thesis
Depositing User:	Mohammad Bagas Saputra
Date Deposited:	15 Aug 2023 02:32
Last Modified:	15 Aug 2023 02:32
URI:	http://repository.its.ac.id/id/eprint/101591

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