A Single Phase Multilevel Hybrid Power Filter for Electrified Railway Applications

Abstract

To improve the power quality of traction power system, a current control method implemented on a multilevel hybrid power filter (MHPF) to compensate harmonics and reactive power is presented. Regarding the traction substation as a compensating object, the power quality of a traction substation can be improved integrally. The hybrid filter consists of a passive filter and a low-rated multilevel power converter. The passive filter works not only as a harmonic filter tuned at the 3rd harmonic frequency, but also as a switching-ripple filters. The multilevel active power quality compensator uses source voltage reference to determine the compensating currents for single phase traction power systems. The rating of the switching devices for the active filter decreases with the use a multi-level inverter topology. Simulation results confirm the validity of the system and show that the adopted current control method is able to compensate reactive power and harmonics in the traction substation single phase 25 kV systems.Index Terms-Electrified railway, harmonics, reactive power, power quality compensator, hybrid multilevel active power filter.

Applications of power electronics in railway systems

“…In [26], [27] and [65] power electronic compensators are designed, simulated and experimented to control voltage form factor on 25 kV ERs. The presented active power filter in [26] and the hybrid (passive and active filters) multi level ones presented in [65] and [27] are shunt connected to solve both harmonic distortion of 3 rd , 5 th and 7 th harmonics and low power factor.…”

Modeling of connections taking into account return plane: Application to EMI modeling for railway

“…The characteristic frequencies are well evaluated as well as the low frequency impedance. This kind of model for connections can complete the model which is used in [13] in order to design a multilevel hybrid power filter for railway applications.…”

Analysis of a Novel Four Level Flying Capacitor H – Bridge Converter

“…Some examples can be given * Corresponding author: feyzullahgulpinar@gmail.com as followings: A single-phase multilevel converter for electrified railway (Rahmani and Al-Haddad 2006) and a new family of single-phase multilevel inverters without clamping diodes and capacitors (Chen et al 2008). It has been shown that THD is a significant factor to evaluate the performance of the topologies (Daher andAntunes 2008, Radermacher et al 2004).…”