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The article touches the topic of processing the measurements of high frequency harmonics in power grids (above 2 kHz). Measurements in wider band do produce large volumes of data. But often not all of these need to be stored in their raw form for further analysis. This article discusses some adaptable possibilities of reducing the amount of data and proposes an intelligent magnitude-oriented scheme...
An alternate method based on Generalised S-transform (GST) is proposed for identification of harmonic, Inter-harmonic and sub-harmonic frequency in power signals. A selective frequency partitioning with reciprocal signal cropping is introduced to significantly reduce the computational demand of the GST algorithm. The proposed selective frequency partitioning is chosen such that the bins at dominant...
This paper is a theoretical study of the magnetizing current components. Three conditions were investigated: 1. Sinusoidal voltage supply. 2. Sinusoidal voltage with dc bias. 3. Sinusoidal voltage with sinusoidal bias. The magnetizing curve is approximated with the equation. The analysis leads to closed expressions that enable the quantitative evaluation of effects dependent on the core geometry and...
Harmonics and interharmonics may introduce operational problems of electrical and electronic equipment. Therefore, monitoring harmonics/interharmonics for improving the power quality is of importance for both electric utilities and their customers. In this paper, a cascade two-stage adaptive linear element (ADALINE) structure for both harmonics and interharmonics measurement is proposed. In addition,...
This paper reports investigation on power quality aspects of wind generation by means of a state space model of fixed-speed turbines. Variable wind speed is assumed to be applied at the wind park; the generation of flicker, harmonics and inter-harmonics is analyzed. Dependency of these effects on the variations in the wind speed is analyzed. The harmonics and inter-harmonics spectrum is obtained using...
Harmonics and interharmonics may introduce operational problems in electrical and electronic equipment. Therefore, monitoring harmonics/interharmonics for improving the power quality is of importance for both electric utilities and their customers. In this paper, a cascaded two-stage adaptive linear element (ADALINE) structure for both harmonics and interharmonics measurement is proposed. In addition,...
Frequency is an important parameter for the power quality analysis. When two or more adjacent spectral lines are too close, many spectrum estimation algorithms fail to distinguish these frequency components. A modified high-resolution singular value decomposition (SVD) method for power quality signal analysis by using down-sampling technique is proposed in this paper. With adopting down-sampling technique,...
IEEE Std 519-1992 is regarded as one of the most widely used power quality standards for both electric utilities and their customers. Among several difficult aspects of applying IEEE Std 519, two issues are related to modeling and measurement of harmonic currents and voltages produced by nonlinear loads. This paper intends to discuss ambiguous aspects of the modeling and measurement when applying...
Power quality, and harmonics in particular, is a major issue in any isolated power system due to extensive use of non-linear power electronic devices. The harmonic problem in an isolated system is even more magnified because of the absence of an external grid, which is a basic characteristic of all isolated systems (like that of a ship). Harmonic studies are, therefore, conducted on a fairly regular...
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