Abstract
Purpose. Parameters of the nominal mode are related to the most important performance indicators of traction means, therefore, the problems of choosing their optimal values always inevitably arise when forming technical requirements for a new rolling stock. The paper describes the features of solving the above-mentioned problems for electric trains with an asynchronous traction drive in the case of two-zone and three-zone frequency control of power. Methodology. Power of nominal mode of the rolling stock should be chosen in such a way that it would be possible to realize a predetermined travel time along in the section or the movement speed. On that basis, and also taking into account the fact that the important operational characteristics of electric trains include the acceleration value during the start-up and acceleration at the design speed, we will formulate the problem of determining the nominal power. In the task for a given range of traction, it is necessary to find such a value of the nominal mode power and the corresponding force value to ensure the ability to carry out transportations with the given level of average speed with minimal energy consumption for traction. At the same time, it is necessary to fulfill the following conditions: a) the speed of the electric train on the section does not exceed the established limits; b) it is possible to realize the given values of accelerations. A more detailed consideration of the problem shows that in real conditions, when the starting acceleration and the mass of the train are given, the problem of determining electric train power is practically reduced to determining the optimal value of the nominal mode speed. Findings. The task of choosing the optimal values of the nominal mode speed is solved by determining the electric power consumption with the variation of the possible values of starting speed. Therefore, only those values that ensure the implementation of the given starting and residual accelerations should be taken into account. The work shows that the traction force value increases with the design speed increase and other equal conditions, if the starting speed is increased. Originality. Authors developed the methodology for determining the optimal values of the nominal mode parameters of electric trains with an asynchronous traction drive, with two-zone and three-zone frequency power regulation. Practical value. The above mentioned methodology can be the basis when forming technical requirements for new rolling stock for Ukraine’s railways.
Highlights
Parameters of the nominal mode are related to the most important performance indicators of the electric rolling stock
A more detailed consideration of the problem shows that in real conditions, when the starting acceleration and the train weight are given, the task of traction supply of electric trains practically reduces to determining the optimal value of the nominal mode speed
Let us consider the case of two-zone regulation using booster modes, i.e. when the implementation of loading modes providing for the realization of traction forces exceeding the values corresponding to the nominal mode is provided
Summary
Parameters of the nominal mode are related to the most important performance indicators of the electric rolling stock. Вісник Дніпропетровського національного університету залізничного транспорту, 2017, No 3 (69). Determining the parameters of the nominal mode (traction force, speed of movement and power) of traction means is the main objective of the so-called traction supply problems. There one can find the ways of solving such problems with regard to freight and passenger electric locomotives, mainly with a collector traction drive. In the case of electric trains, the tasks of determining the parameters of nominal mode were considered in a smaller volume and only with reference to the collector traction drive [3, 4, 9]. The features of these traction supply problems for electric trains with an asynchronous traction drive are described
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