FREQUENCY DETERMINATION OF HIGH-FREQUENCY LINK FOR PERCPECTIVE ELECTRIC ROLLING STOCK
Purpose. Total mileage of Ukrainian electric railways is distributed approximately equally between the areas of direct and alternating current. A double system of electric rolling stock is used to pass jointing places of different current kinds without train’s stop. Therefore introduction of such...
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| Format: | Article |
| Language: | English |
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Dnipro National University of Railway Transport named after Academician V. Lazaryan
2014-12-01
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| Series: | Nauka ta progres transportu |
| Subjects: | |
| Online Access: | http://stp.diit.edu.ua/article/view/30448/28038 |
| Summary: | Purpose. Total mileage of Ukrainian electric railways is distributed approximately equally between the areas of
direct and alternating current. A double system of electric rolling stock is used to pass jointing places of different
current kinds without train’s stop. Therefore introduction of such rolling stock of a new concept that is using an
asynchronous traction drive is prospective for Ukrainian railways. Apart from advantages a rolling stock of similar
concept has significant disadvantages, it is pulse energy consumption from the power supply, and it can affect the
reliability of track automatic devices, and consequently, the train traffic safety. In addition the specific power of
traction transformer is considerably inferior to the power density of other traction elements. The promising schemes
using an intermediary link of increased frequency, which consist of a transformer and inverter, have been proposed
for disadvantages amendments. The main task for the further introduction of prospective circuit is to determine the
operating frequency for high frequency link. Methodology. The method of thermal parameters calculation of semiconductor
devices has been used for determination switching transistors of maximum operating frequency. To obtain
analytical expressions curves of energy, released during the IGBT (insulated-gate bipolar transistor) switching
from its current load approximation method is used. Findings. The permissible frequency of low-frequency link is
determinated by load current of intermediate transformer. Operating frequency range of a link depending on load
current has been determined. A comparative analysis of the switching characteristics of 65 class IGBT production
by companies Infineon and ABB has been performed. Originality. The further determination method of the maximum
operating frequency of intermediate link for circuit with high-frequency transformer has been developed.
Practical value. The established operating frequency range of the high-level link will develop further research of
tractive circuit with high-frequency transformer use for double feed electric rolling stock with asynchronous tractive
drive. It will evaluate the introduction effectiveness of similar configuration circuits. |
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| ISSN: | 2307-3489 2307-6666 |