Train Operation Minimizing Energy
Consumption In DC Electric Railway With
On-board Energy Storage Device
Author(s)
K. Matsuda, H. Ko & M. Miyatake
Abstract
The optimal train operation which minimizes sum of supplied energy from
substations is presented in this paper. In recent years, the energy storage devices
have enough energy and power density to use in trains as on-board energy storage.
The electric double layer capacitor (EDLC) is assumed as an energy storage
device in our study, because of its high power density. The on-board storage
can assist the acceleration/deceleration of the train and may decrease energy
consumption. Many works on the application of the energy storage devices to
trains were reported, however, they did not deal enough with the optimality
of the control of the devices. On the other hand, our previous works were to
optimize acceleration/deceleration commands of the train for minimizing energy
consumption without the energy storage device. Therefore, we intend to optimize
acceleration/deceleration commands together with current commands through
energy storage devices as our next research target. The proposed method can
determine the optimal acceleration/deceleration and current commands at every
sampling point. For this purpose, the optimal control problem of the train operation
is formulated mathematically. It is generally difficult to solve the problem because
the problem is composed of a large-scale non-linear system. However, the
Sequential Quadratic Programming (SQP) can be applied to solve the problem.
Two results with and without on-board energy storage device are compared. These
optimized results indicate that the total energy consumption is reduced by at least
0.35% by using the EDLC. The relation between internal resistance and energy
consumption is also revealed.
Keywords: electric double layer capacitor (EDLC), optimal control, energy saving
operation, SQP method.
Keywords
electric double layer capacitor (EDLC), optimal control, energy saving
operation, SQP method.
Related Book
Other papers in this volume
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