Дослідження ефективності роботи згладжувальних пристроїв перетворювальних агрегатів тягових підстанцій постійного струму

Abstract

The article considers ways to improve the quality of the energy supply of electric rolling stock of DC railways. An analysis of the work of smoothing devices used in traction substations is performed to compensate for the variable component of the output voltage. In the case of asymmetry of the input voltage of the transformer unit in the traction network, non-canonical harmonic components of the output voltage of the traction substation of a direct current are generated, for their suppression, too cumbersome smoothing devices are required. The study of smoothing devices was carried out on simulation computer models and it was found that in the case of asymmetry of input voltages by the rectifier unit, it is generated in the output voltage of the harmonics at a frequency lower than the main, frequency of the supply network, which is called the non-canonical harmonics of the variable component of the output voltage of the traction substation. They are not suppressed by any passive filter, in addition, the voltage pulsation factor increases and creates a significant interfering effect on the device of the automatic locking system. To avoid such problems, it is necessary to reduce the resonance frequency of the LS-filter to the necessary value, which excludes the enhancing properties of the smoothing device at frequencies of the harmonic components in the range of non-canonical harmonics.