Sinaga, Yoseph Zulfranto (2026) ANALISIS KONDISI PERALIHAN MOTOR INDUKSI TIGA FASA MENGGUNAKAN SIMULINK MATLAB (STUDI KASUS PADA PT CPP PRIMA). S1 thesis, Universitas Malikussaleh.

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Abstract

Three-phase induction motors are widely used as primary drives in various industrial processes; however, they often experience transient phenomena during the starting process, particularly in the form of high inrush current. This high starting current can lead to voltage dips in the electrical system and accelerate mechanical wear due to large electromagnetic torque shocks. Therefore, this study aims to analyze the transient characteristics of a three-phase induction motor by comparing the effectiveness of the soft starter method and V/f control in mitigating transient effects under various operating conditions at PT CPP Prima. The research methodology is based on simulation using MATLAB/Simulink, referring to a 315 kW induction motor specification. The independent variables include Direct On-Line (DOL), soft starter, and V/f control methods, which are tested under three loading conditions: no-load, full-load, and load disturbance. The observed dependent variables are stator current, rotor speed, and electromagnetic torque, with performance parameters evaluated based on rise time and settling time. The simulation results indicate that under no-load conditions, the soft starter provides a faster response with a rise time of 0.30 s and a settling time of 0.45 s; however, it produces a higher stator current of 213 A compared to V/f control at 196 A. Under full-load conditions of 2000 Nm, the soft starter achieves a faster rise time of 1.4 s, while V/f control maintains rotor speed closer to the nominal value at 1487 rpm, albeit with a longer settling time of 2.6 s. During load disturbance from 2000 Nm to 500 Nm, V/f control demonstrates superior performance in maintaining rotor speed stability at 1486 rpm with a rise time of 0.55 s. Overall, the soft starter excels in achieving faster transient response, whereas V/f control is more effective in reducing current and maintaining speed stability, particularly under dynamic loading conditions.

Item Type:	Thesis (S1)
Subjects:	Q Science > Q Science (General) T Technology > TJ Mechanical engineering and machinery T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:	Fakultas Teknik > 20201 - Jurusan Teknik Elektro
Depositing User:	Yoseph Yoseph Sinaga
Date Deposited:	27 Aug 2026 07:38
Last Modified:	27 Aug 2026 07:38
URI:	https://rama.unimal.ac.id/id/eprint/21677

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