Abstract
Many types of regenerative braked cars are being introduced in dc electric railway for energy saving. Recently specially inverter cars are being placed in service. In East Japan Railway Company inverter control cars (type 209) have their regeneration coefficient mutch increased from about 25% to about 33% as compared with cars (type 205) with superposed field excitation control.
We may expect the regenerative coefficient to be lowered by invalidation on particular sections or particular time zoon, so we must search for the dc feeding system which can level up the regenaration coefficient. On the other hand, recently thyristor rectifier substations are being built to superannuated silicon rectifier substations. We can control the feeding voltage of substation. In the case of inverter cars such as type 209 the author has studied the quantitative effect of saving enegy with many kinds of feeding voltage control system, and demonstrated with simulation the increase in regenerative power and decrease in power consumption without levellig down the acceleration ability of cars.
