Control Method for Increasing Motor Power of DC-electrified Railway Vehicles with an Onboard Energy Storage System

Abstract

In this paper, a novel DC bus voltage control strategy of the traction system is proposed for overhead line and energy storage device (ESD) hybrid railway vehicles. This strategy realizes the increase of regenerative brake energy and reduction of consumed energy in the powering by boosting the traction motor voltage. When a DC bus voltage boost is applied, the traction system is separated from the overhead line by a breaker, which is generally equipped. This paper proposes a strategy considering both breaker operation and energy management of onboard ESD. The static state is calculated to reveal the effect of the reduction of energy consumption and the energy management of ESD by applying the proposed control method. The calculation results confirmed a 10.1% and 8.87% decrease in total energy consumption when the DC bus voltage was boosted to 1950V for single and multiple travel between several stations, respectively. Moreover, the proposed energy management method was verified at 4 patterns of the DC bus voltage. A numerical simulation was also performed to verify the dynamic characteristic, especially from an overvoltage point of view. As a result, the DC bus voltage can be regulated without detecting overvoltage.

Method to Design Power and Energy Capacity of Onboard Energy Storage Device for Emergency Operation Based on Simple Formulation

“…Method to Design Onboard ESD Capacity for Emergency Operation (Hiroyasu Kobayashi et al) simulation. The loss of IGBT PlossIGBT and diode PlossDIODE are calculated by (10) and (11), respectively. For the calculation of PlossIGBT, a waveform shown in Fig.…”

“…Furthermore, the motor loss is also calculated utilizing motor parameters in Table 1. Here, cupper loss of the IM Wc and iron loss of IM Wi are generally calculated by ( 12) -( 14), respectively (8)(9) (10) . Where i1d, i1q: stator current, B: magnetic flux density, f1: inverter frequency, Em: motor voltage.…”

Optimization of train timetables and placement of charging facilities for battery‐powered LRT

“…14,15 In addition, some attempts have been made to target battery trains. [16][17][18][19][20][21] On the other hand, few studies deal with LRT and other relatively slow trains 22,23 or explore the optimal placement of charging facilities.…”

“…Much effort has been made toward energy saving in railways, including derivation of optimal operation methods 10–13 and optimization of train schedules 14,15 . In addition, some attempts have been made to target battery trains 16–21 . On the other hand, few studies deal with LRT and other relatively slow trains 22,23 or explore the optimal placement of charging facilities.…”