Energy storage system of regenerative braking in urban railway based on supercapacitor

Usin, Mohamad Fazli (2021) Energy storage system of regenerative braking in urban railway based on supercapacitor. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

A railway electrification system has been used long time ago because of the high power to the weight ratio advantage compare to the diesel and steam systems. The electrification systems generate an electrical power and supplies electrical energy to railway trains and multiple units which is enables for faster expedition and higher tractive power. Using electrification systems it can reduce cost of maintenance especially on the traction units and give a better result in environment effect for overall system compare to the other systems. By using 25 KV AC supply from overhead lines and 750 V that using a third rail system. Supercapacitor (SC) is an energy storage technology that is rapidly developing and being implemented in various industrial applications. This system consists of double-layer supercapacitor, along with the required conditioning choppers and auxiliary devices, necessary to capture and store a transit vehicle’s kinetic energy that would otherwise be lost during braking. In Malaysia, train that using supercapacitor as energy storage for storing braking energy for reuse during acceleration is KTM Class 61 (Keretapi Tanah Melayu) but powered by on board diesel multiple unit or DMU. This project propose focus on modeling and analyze the energy storage in electrification train using supercapacitor. Supercapacitor is a common component which is used in electric vehicle or electrification train system. It has higher power density to store energy. It has higher power to discharge process are studied and investigated. This project focus on stored and recycled wasted energy by using Energy Storage System (ESS). 30 V lead acid battery, 16 V supercapacitor module are connected and tested in MATLAB simulations. The results of supercapacitor’s behaviour and battery’s behaviour respectively. In the simulation model, current, voltage and power are investigated and studied.

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