Modelling and Evaluation of Electrical Power in Mass Rapid Transit (MRT) Systems using Field Oriented Control (FOC)

Prasetyo, Antonius Doddy Tyas and Tobing, Tahan Lumban and Elfando, Dery and Sialalahi, Eva Magdalena (2026) Modelling and Evaluation of Electrical Power in Mass Rapid Transit (MRT) Systems using Field Oriented Control (FOC). IEEE. pp. 257-261.

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Abstract

A key component of MRT operation as a con- temporary urban transportation system is the dependability and efficiency of the electric power system. The traction sys- tem, particularly the three-phase induction motor that powers the train’s primary propulsion, places the largest and most dynamic strain on this system. The control mechanism used has a significant impact on the performance of this motor. Therefore, this study’s goal is to thoroughly investigate the use of inverter technology using a vector control (VC) approach, also known as field-oriented control (FOC), and assess how it affects important parameters in the MRT’s power system. Using extensive mathematical modeling and dynamic simulations based on MATLAB / Simulink software, the methodology of this study takes a quantitative approach. A three-phase induction motor acting as the load, a field-oriented control (FOC), a pulse width modulation (PWM) inverter, and the power supply make up the model. The simulation aims to simulate the actual operating conditions of the train. According to simulation results, the system uses about equal amounts of active power (P) and reactive power (Q), 217.8 kW and 217.6 kVAR, respectively. A lagged power factor of 0.707 is obtained from these figures. For large- scale power systems, this figure is still within an acceptable operating range, although it shows a considerable reactive power consumption. The outstanding quality of the present is one of the most important conclusions of the study. A remarkably low current Total Harmonic Distortion (THDi) value of 0.288% was found through harmonic analysis. The international standard IEEE 519 2014 recommends a maximum threshold of 5%, which is much lower. The use of a vector-controlled inverter in the MRT train drive system has demonstrated that it can precisely regulate motor torque and speed while preserving high power quality. By preventing harmful harmonic distortion from being introduced into the MRT grid by the traction system, the low THDi improves the overall stability, effectiveness, and dependability of the system.

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