In order to optimize the feeding voltage of substations with diode rectifiers or the voltage-current characteristics of substations with thyristor rectifiers in dc railway power feeding systems, a computer simulation model which can set the following parameters is needed: (1) track profile and location of stations and substations, (2) substation characteristics, (3) train characteristics and (4) train scheduling data, especially start-to-stop time between stations next to each other. Setting parameter (4) is not so easy because acceleration performance of trains depend on the line voltage. In the conventional simulation programs, this causes fluctuation of start-to-stop time of trains which has great influence on energy evaluation. For this reason, the results of existing works on optimization of dc power feeding systems using conventional simulation models did not have enough reliability.
For this reason, we developed a new simulation program named RTSS, and implemented the simulation model in which trains run with precisely fixed start-to-stop time. In realizing this, we took advantage of the fact that coasting and braking performance is not affected by fluctuation of the pantograph voltage. Because of this fact, the time to take to reach the next station with only coasting and braking is easily estimated given the present position and velocity. Using this technique, we can easily fix start-to-stop time precisely by altering the point to stop accelerating according to the condition.
In this paper, the authors describe in detail the simulation model implemented in RTSS, and discuss about its reliableness to show that the new model is superior to the existing models for evaluation in optimizing power feeding systems.