Power quality was always a major concern in designing an electric supply system for railways. Since electric railcars are usually single-phase loads, they draw high amounts of negative sequence component of currents, in addition to harmonic contents and transient currents. Therefore, many compensation methods were examined to improve the power quality indices. The active power quality conditioner (APQC) can be considered as an ideal compensator for high-speed railway, which contains a three-phase converter connected to the traction substation through a step-down transformer. However, with the growth of railway loads, the nominal rating of the solid-state high-frequency switches of APQC increases seriously, which in turn, results in an exponential growth of the cost of power-electronic switches. Therefore, for a very high-capacity railway system, it is not economic to apply an APQC. As a solution, a combination of APQC with the static VAr compensator is proposed in this study, which reduces the rating of APQC, and improves the power quality of the system. Simulation results validate the pre-defined hypothesis. Moreover, the performance of APQC depends on the DC-link operation, for which genetic-algorithm optimisation has been applied to obtain an optimum design of a stable DC-link voltage.
Hybrid railway power quality conditioner for high-capacity traction substation with auto-tuned DC-link controller
IET Electrical Systems in Transportation ; 6 , 3 ; 207-214
01.09.2016
8 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
genetic-algorithm optimisation , traction power supplies , autotuned DC-link controller , static VAr compensator , railways , high-capacity traction substation , substations , hybrid railway power quality conditioner , stable DC-link voltage , APQC , power supply quality , genetic algorithms , active power quality conditioner
Metadata by IET is licensed under CC BY 3.0
Wiley | 2016
|Railway System: Hybrid Railway Power Substation
Wiley | 2016
|Study of novel traction substation hybrid power quality compensator
Tema Archiv | 2002
|Traction power supply of Oeresund Railway Link
British Library Online Contents | 2002
|Power peak value adjusting system and method for railway traction substation
Europäisches Patentamt | 2020
|