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This paper verifies the importance of load modeling for the harmonic assessment of power systems. Three different models are discussed, and the impact of each approach on the harmonic evaluation of power networks is highlighted. Through this discussion, a Harmonic Coupled Norton Equivalent (HCNE) model is pointed out as a suitable approach to represent the behavior of harmonic producing loads. A methodology...
This paper presents how the PWM controlled AC locomotives are disturbing the electric network with harmonics. Previously the so called double domain simulation method was published. The double domain simulation is suitable for studying the different filtering methods, like the passive, active and hybrid filtering. In this paper the combination possibility with AC locomotives are discussed. The double...
In many of clustering algorithms, such as K-means and Fuzzy C-mean, the value of the expected numbers of clusters is often needed in advance as an input parameter to the algorithm. Other clustering algorithms estimate this number as the clustering process progresses using various heuristic techniques; however such techniques can also lead to a local minima within the solution space without finding...
Due to the increasing use of nonlinear loads, the associated power quality (PQ) problems have become a major concern to many electric utilities and their customers. For efficient and accurate analysis, the performance of computer simulation has been recognized as an important and necessary procedure to the power quality study. With the advanced development of computer and communication technologies,...
Power quality problems are increasing with the widespread use of electronic equipments, which cause harmonic distortion of voltages and currents. Individually, a low power single-phase nonlinear load may not pose many serious harmonic problems but large concentrations of these loads have the potential to raise harmonic voltages and currents to unacceptable levels and harmonic current "pollution"...
This paper describes methods used to analyze problems associated with arc furnace and its influence on the power system. Some measurements are analyzed using wavelet transform for harmonic, flicker and unbalance detection. A set of data obtained from simulation and measurement in a furnace are used to evaluate the performance of this method (called pqAT). Experimental results are presented and used...
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