This paper presents an optimal position and capacity of Wayside Energy Storage Systems (WESSs) stored a regenerative braking energy for DC mass rapid transit of Silom Line by using a single train simulator. The optimal capacities of 2 WESSs are 4.61 kWh and 5.43 kWh. The study searched for the optimal positions based on 2 methods, i.e. considering the optimal position at the energy supply station and the least energy loss. Method 1: the researcher manually changed two WESSs’ positions with a step of 1 km in order to find the optimal positions. The results showed that the optimal positions were at 6 and 10 km away from the departure station with the energy consumption decrease 8.18% and the loss energy decrease 30.15%. Method 2: the researcher employed Particle Swarm Optimization (PSO). The results showed that the optimal positions were at 6.93 and 10.43 km with the energy consumption decrease 8.37% and the loss energy decrease 30.35%. The optimal positions searched by PSO method could shorten the simulation process and define precise position with more accuracy than the first method. Also, the optimal positions and capacities of WESSs were dependent on a train"es speed profile and control strategy of energy storage system. To apply the model in this paper to another system can be conducted by changing parameters and system conditions such as a train’s parameters, train’s speed profile, and control strategy of WESSs.
Keywords
Regenerative Braking; Wayside Energy Storage System; Mass Rapid Transit
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