The analysis of power circuits using a high-power transformer for the feeding of induction traction motors of electric rolling stock

摘要

The perspective direction in the field of railway transport is the development and implementation of multisystem electric rolling stock which used asynchronous traction drive. Traction drive is the main power conversion system for rolling stock and includes transformers, converters and motor. Traction Transformer is the most cumbersome part of the drive and has great weight and volume. Therefore, reducing its weight and dimension parameters can obtain a more compact and economical drive in general. One way to significantly reduce weight and size parameters of traction transformer is increasing its operating frequency. To achieve this it is necessary to develop special circuits for feeding high-frequency transformer. Existing circuit engineering solutions do not allow greatly simplified scheme and, in some cases, have low efficiency. It is therefore necessary to develop a circuit of power circuits electric rolling stock which will have high efficiency, easy realization in terms of circuitry and reliable in operation. In this work analyzed the existing circuits of multisystem electric rolling stock which use high-frequency transformer and developed a new version of the circuit. Authors proposed a new version of the circuit of dual-system electric rolling stock with asynchronous traction drive will reduce the weight and size of transformer parameter, increase efficiency of electric rolling stock in direct current power supply 3 kV and increase reliability in emergency modes. Besides in the proposed circuit is missing sampling pulse energy from power network that increases the level of electromagnetic compatibility of electric rolling stock with automation devices.