Kształtowanie charakterystyk trakcyjnych napędów do elektrycznych zespołów trakcyjnych w trakcji wielokrotnej

If electric multiple units (EMUs) are operated in multiple running, i.e. as trains formed from two or three EMUs coupled together, there is a necessity for limiting electric power drawn from the catenary by such a train. The value of limited power depends on parameters of substations supplying the rail lines on which such trains are operated. This paper deals with one of methods for determining the traction curves of EMU drives that allows for limiting the electric power drawn from the catenary. An example of determining the traction curves of EMU drives for double and triple running is given. The calculations for a hypothetical EMU are made. A given value of the maximum available power in the catenary is taken into consideration. The electric energy consumed by auxiliary converters for supplying EMU auxiliaries as well as the existence of the weakened power region (high-speed region) on the traction motor torque-speed characteristic curve are allowed for. As a result of calculations made, the traction curves of EMU drives are given. Such curves should be implemented in the EMU’s drive control unit and used by the drive controller in the case of double or triple running of EMUs.