A Demonstration Project for Installation of Battery Energy Storage System in Mass Rapid Transit

This paper presents an application of the stationary Li-ion battery on behalf of battery energy storage system (BESS) in the mass rapid transit system. The DC electrified railways have often-frequent stop during their journey that mean the regenerative braking energy from the train braking is likely to regenerate back to the DC electrified network. This energy could potentially support the auxiliary loads onboard and the adjacent trains simultaneously; however, the electrical braking resistance onboard would dissipate some of the surplus energy. The surplus energy could be absolutely recovered and stored in the stationary BESS and then this potential energy is efficiently supplied to support that own train's for acceleration or other adjacent trains simultaneously. The modified Bangkok Transit System (BTS)-Sky Train Sukhumvit Line in Thailand (from Mochit - Bearing stations) is employed for the demonstration with the multi-train simulator (MTS). This system has the service distance of 21.60-km with 22 passenger stations and 8 traction substations. The electrified operation system is 750-V DC rectifier substations to supply the electric power through the 3rd rail. Results show that the energy saving of the BTS system with the stationary BESS and with regenerative braking energy is achieved by 13 times of the system with BESS and without regenerative braking energy.