POWER STATIC CONVERTER OF TRACTION ELECTRIC DRIVE OF AC ELECTRIC TRAINS

Abstract

Purpose. Increasing the operational indicators of suburban transportation on railways electrified by alternating current due to the modernization of traction static converters of ER9M electric trains. Methodology. The methodological basis of the study is the general theoretical provisions and principles of the system approach of theoretical electrical engineering, the theory of power converters. The main principles of construction of traction static converters of electric rolling stock of railways are used. Findings. The analysis of the basic rectification schemes of alternating current electric trains was performed. As an alternative scheme, it is proposed to introduce a controlled rectification scheme based on a four-zone rectification scheme, which is similar to electric locomotives, which allows using most of the known advantages of non-contact traction electric drive control systems. Some energy figures are calculated for the fully controlled and semi-controlled circuit. As a result of the comparison, the modernization option based on a semi-controlled rectification scheme was selected. The required values of starting power of the transformer and power factors for schemes with uncontrolled, fully controlled and semi-controlled rectifiers are determined. A selection of modern semiconductor elements is offered for the configuration of converters. It was shown that in the case of modernization of the rectifier scheme, there is no need for significant capital investments due to the preservation of the main traction transformer and traction motors of the electric train. Practical value. The obtained results can be used by enterprises that carry out major repairs of alternating current electric trains.