Minimizing Energy Consumption In Railways By
Voltage Control On Substations
Author(s)
A. U. Raghunathan, T. Wada, K. Ueda & S. Takahashi
Abstract
We propose an optimization method for minimizing energy consumption in DCelectrified
railways where the trains are fitted with regenerative brakes. Reduction
in energy consumption is achieved by controlling the voltage at the substations in
real time. Conditional constraints are employed to model the behavior of trains and
substations. This allows us to relax some of the imposed limits thereby enlarging
the operating envelope of system and increasing the potential for energy savings.
The conditional constraints are modeled using complementarity constraints which
are smooth and differentiable. The optimization problem is an instance of a Mathematical
Program with Equilibrium Constraints (MPEC). A numerical example
with 42 trains and 8 substations is used to illustrate the savings from the method
and the computational times. The proposed approach is shown to reduce energy
consumption by about 3% over 2:5 minute of operation, recover about 97% of the
regenerated energy while computing the optimal voltages in real time (< 1s).
Keywords: substation voltage control, regenerative braking, conditional models,
complementarity constraints, mathematical programs with equilibrium constraints,
energy reduction.
Keywords
substation voltage control, regenerative braking, conditional models,
complementarity constraints, mathematical programs with equilibrium constraints,
energy reduction.
Related Book
Other papers in this volume
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