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Harmonics produced by residential loads have become an increasing concern in recent years due to the extensive adoption of power-electronic-based home appliances. This paper presents analysis on extensive field data collected from various locations of residential distribution systems in North America. The degree of cancellation of harmonic currents from different sources is determined. A comparative...
The paper analyses the power quality in power substations from residential and educational buildings (campus university). Measurements were performed in two days, one in a weekday, and one in a weekend, to highlight differences. Measurements in the power substation were performed using power quality analyser. Electrical measurements were performed for voltages and currents spectra, Fresnel diagrams,...
As a kind of large-power, single-phase and nonlinear load, the electrified railway produces a great deal of harmonic, which has a severe impact on the power quality in power system. In this paper, a set of practical indicators is put forward firstly, in order to analyze the transmission characteristics of the harmonics and negative sequence voltage and current in power network quantitatively. Secondly,...
High-speed electrified railway traction load will affect the power quality. To satisfy the request of rapid speed and high density traffic, the large and impactive traction power is necessary for trains running on the high-speed electrified railway. The traction load call for a power system with strong power supply capability, and its effects on power quality of the power system should not be ignored...
A comprehensive harmonic monitoring program has been designed and implemented on a typical medium-voltage distribution system in Australia. The monitoring program involved measurements of the three-phase harmonic currents and voltages from the residential, commercial, and industrial load sectors. Data over a three year period have been downloaded and available for analysis. The large amount of acquired...
The present paper describes the general procedures applied in the Romanian Transmission Grid to monitor the main power quality parameters accordingly to the national norms. According to the requirements of the Romanian regulations, a study case was conducted at the 110 kV buses of power delivery from the 400/220 kV transmission network to the distribution subnetworks of a regional power system in...
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...
In order to reduce the impact of harmonic and negative sequence on the power system, in traction substation can use Scott wiring traction transformer. By using MATLAB to establish a Scott wiring transformer model, the 110 kV side of the three-phase harmonic voltage and current with its harmonic content and negative sequence can be simulated. Comparing simulated results and actual data of one transformer...
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