Comparative study on the position of shunt active power filters in 25 kV AC railway systems

Abstract

AC electrified railway systems show power quality problems such as harmonic current pollution, feeder voltage perturbation, and reactive power demand. These power quality problems have a bad effect on the AC railway system itself as well as other electric systems connected together. This paper investigates comparatively two configurations of a shunt active power filter (SAPF) for improving power quality in the AC railway systems. Different control algorithms corresponding to the installation position of the active power filter at the substation or at the sectioning post are proposed respectively. A comparative case study on the two positions of SAPF has been performed comprehensively.

Optimal multi-objective placement and sizing of passive and active power filters by a fuzzy-improved harmony search algorithm

“…The PLAS problem of the power filters basically represents an optimization problem in which different objective functions may be used: THD, telephone influence factor, harmonic transmission line loss (HTLL), motor load loss function (MLLF), etc. [17][18][19][20][25][26][27]. The first types of constraints are harmonic standards imposed on the level of voltage harmonics and THDs in different locations according to the IEEE-519 standard [16][17][18][19][20].…”

“…The M is a set of real and non-negative values, provided that APF sizes are considered continuous. Equations (23) to (26) express individual harmonic distortions of voltage and current, respectively. When PPFs are used with the APFs cutoff, an adjunct constraint is added as Equations (24) and (26).…”

“…One combination of the new reliable power devices used to improve power quality delivered to the utilities is the HPFs. So, in this paper, the PLAS problem of HPFs has been considered to compensate harmonics and ameliorate power quality and to prevent the new installation of bulky PPFs .…”

Performance of three-phase three-wire cascaded H-bridge multilevel inverter-based shunt active power filter

“…In the past decade, passive power filters such as series inductance, shunt capacitor and zigzag three-phase transformer are used to mitigate harmonic distortion at power system. However, those filters cannot work efficiently and furthermore they are unable to mitigate completely low frequency harmonics [7][8][9][21][22]. Hence, Active Power Filter (APF) has been introduced to mitigate low and high harmonics distortion in the power system.…”