Abstract
The single-phase traction load has essentially an unbalance characteristic at the Point of Common Coupling (PCC), which injects harmonic into the utility grid. In this paper, the effect of harmonic distortion and unbalance loading are investigated simultaneously for electrical railway systems. Special traction transformers (i.e. single-phase, V/V, Wye-Delta, Scott, and Le Blanc) are used between the utility grid and the traction load. For analysis, different definitions of power factors are considered, which are presented by IEEE Std.1459. The detailed simulation study is made with MATLAB/SIMULINK program to represent the impacts of harmonic components and unbalance loading on the power factor behavior in the Electrical Railway systems.
Highlights
Recent technological advances have been made with respect to serious problems in existing railway systems
The single-phase traction load has essentially an unbalance characteristic at the Point of Common Coupling (PCC), which injects harmonic into the utility grid
The detailed simulation study is made with MATLAB/SIMULINK program to represent the impacts of harmonic components and unbalance loading on the power factor behavior in the Electrical Railway systems
Summary
Recent technological advances have been made with respect to serious problems (e.g. population growth continuously, environmental pollution, energy shortages, and inadequate transportation capacity) in existing railway systems. Non-linearity, asymmetrical, and non-sinusoidal are other characteristics of such single phase loads This results in an unbalance and harmonic load to the utility grid more than before. “Chang Ping” and his colleagues have studied the effects of harmonic distortion and unbalance loads on the different power factor definitions in railway systems regarding the following assumptions [7]. 2) They have studied separately the effects of harmonic distortion and unbalance loads on the power factor behavior for three transformer connections (i.e. V/V, Scott and Le Blanc). This paper is aimed at evaluating the power factor behaviors of the utility grid in various terms of unbalance positions and harmonic distortion, using the real load model [8]. To calculate the power factors in different conditions of the Electrical Railway systems, a suitable definition is introduced for aforementioned special transformer connections
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