Complex Design Method of Filtration Station Considering Harmonic Components

Vaclav Kus,Pavel Drabek,Bohumil Skala

doi:10.3390/en14185872

Abstract

The paper deals with a new methodology for calculating the filter parameters. The basis is respect for the fact that the real filter current consists of other harmonic components, which filter is tuned. The proposed methodology was used to design filters for traction substation 25 kV/50 Hz. The operation of the locomotives in the AC supply systems of 25 kV/50 Hz leads to a rising of higher order harmonic currents. Due to the 1-phase supply system, these are mainly the 3rd and 5th harmonics. By simulation and subsequent measurement of the proposed traction power station filters the proposed methodology was verified. Thus, the filter design can also be used for filter compensating stations of the standard 3-phase distribution network. The described method presents an optimal filter design without unnecessary oversizing. This fact reduces the size and cost of the filter. It is shown that it is possible to design a filter that meets the requirements for power quality under extreme load and to minimise distortion of line voltage.

Highlights

The amount and power of non-linear loads are growing steadily
The paper described a new methodology for optimum filter design for harmonic low-order filtering of traction substations and reactive power compensation
A specific feature of the traction system is the single-phase system, which is the cause of the 3rd harmonic current

Summary

Introduction

The amount and power of non-linear loads are growing steadily. the connection and converter control are completed with respect to the reduction of harmonic currents, it is often necessary to equip the substations with equipment for harmonics minimization and power factor compensation. The design of filters for high powers is well described in the literature, for example [1,2]. Filters are tuned to a characteristic harmonic Their designs are based on fundamental relations of Theoretical Electrical Engineering. Using filters and decompensation unit in the traction system is described in [7] Another way is to use active filters or other types of electronic converters [8,9,10]. The advantage of these systems is a better filtering and compensating effect. The effects of filters designed for resonant frequency, in addition to extreme loads, are described in [11]

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Conclusion