WIT Press

A Numerical Algorithm For Run-curve Optimization Of Trains Considering A DC Feeding Circuit


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H. Ko & M. Miyatake


An algorithm optimizing total energy consumption of multiple train operation considering a DC feeding circuit is investigated in this paper. Our mathematical formulation includes several characteristics of trains which depend on feeding voltage. It makes it possible to give detailed consideration to an energy-saving operation. It is especially important for us to be able to discuss the influence of squeezing control of regenerating current and feeding loss. We constructed the optimizing algorithm based on the gradient method applicable to large-scale problems for future works. Several numerical examples are demonstrated to verify the reliability and validity of the proposed method. Every optimisation result is obtained within a minute. Keywords: train operation control, optimization, energy-saving, DC feeding system. 1 Introduction In recent years, regenerative energy of trains with electrical regenerative braking system plays an important role in reducing whole energy consumption in DC railway system. However, there are several difficulties in collecting regenerative energy efficiently. One of these difficulties is that the regenerating ability and amount of regenerating energy depend closely on feeding voltage of a train. For example, the maximum amount of the electrical braking torque is limited by feeding voltage, and feeding loss also relies on feeding voltage. In addition, it is indispensable to discuss influence of squeezing control of regenerative current for preventing overvoltage of feeder. The other difficulty in collecting


train operation control, optimization, energy-saving, DC feeding system.