Masahisa Kageyama

Development of battery system for railway vehicle

West Japan Railway Company (JR WEST) has been developing battery-powered trains that are intended to improve energy saving for diesel cars in non-electrified sections. In our development, the battery system can be connected directly to the inverter due to its voltage. Simple circuit structure can be expected. We confirmed the possibility of the system by running test. In addition, we carried out thermal simulation and grasped heat characteristics as a next step. In this paper, we introduce the characteristics of our system, the results of running tests and thermal simulation.

Development of a train running energy simulator for commercial train running

Authors have developed a train running energy simulator with some functions of speed profile generators and an equivalent feeding circuit model for the purpose of the energy estimation of commercial train running. Energy consumption depends on feeding voltage, which varies according to the running position of the train and the condition of other running trains. Therefore, the developed simulator has an equivalent feeding circuit model for commercial train running. This paper verifies the developed simulator using recorded running data of commercial trains.

A method of calculating running resistance using monitoring devices for energy simulators

A simulator with high precision for calculating energy consumption in train operation has been developed by authors. In order to improve the accuracy of the simulator, it is important to input running resistance with high precision under various conditions to the simulator as parameters. Therefore, this paper proposes a method of calculating running resistance under various conditions without the running tests by using monitoring data on service trains, the track and structure database and the weather database. In addition, this paper reports the case in which the precision of the simulation results is improved by using the running resistance formula by this method.

A control method for on board battery power to compensate the fluctuation of line voltage in case of long distance power feeding in DC electric railway

In this paper, a control method for on board battery power to compensate the fluctuation of line voltage in case of long distance power feeding and to manage the energy of battery in DC electric railway is proposed. Then, the control method is verified by numerical simulations. And, we confirm that the control method can compensate the fluctuation of line voltage and manage the energy of battery. In addition, a practical example of the proposed control method, a method of setting control parameters when setting the minimum line voltage is shown.

Verification of a train traction power simulator for DC feeding system by a commercial operation measurement

We have developed a train traction power simulator, for the purpose of estimating the effect of regenerative absorbers. And we have measured energy consumption of substations for a verification of the train traction power simulator. Measured energy consumption fluctuates by various factors. One of the factors is outside temperature, which influences auxiliary energy. This paper shows a verification using a distribution figure taking into consideration outside temperature.

Study of practical energy-saving operation for electric railway vehicle

JR West has been promoting the energy-saving operation to improve the railway energy efficiency. In this paper, we report the practical energy-saving operation method obtained through the study of energy-saving operation of JR West and the result of its practical use in commercial operation.