Morphological filter to remove harmonics of electrical signal: Harmonics removal
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Currently mathematical morphology is used in the analysis of electric signals due to the clear understanding of its processes and results. Traditional filters use elements based on electronic power to eliminate harmonics. The aim of this paper is to describe the use of this method for filtering harmonic signals using four basic operations of mathematical morphology such as: dilatation, erosion, opening and closing, including necessary simulations and analysis to confirm its correct functioning. The presented work is applied to real signals measured in the laboratory of electric machines at Universidad Politécnica Salesiana Cuenca. Results show the effectiveness of the algorithm in removing harmonics from the input signal in order to get a signal as similar as possible to the fundamental component.Keywords:
SIGNAL (programming language)
Harmonic
Harmonic Analysis
Fundamental frequency
Mathematical Morphology is a new science of image processing and analysis. This article present the filter property of opening closing operation in Mathematical Morphology, and discuss the algorithm and method of using opening closing operation to process the image polluted by noise.
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Application of nonlinear - load especially power electronic devices in power system causes the increase of harmonics content. It causes greatly harmful to the stable operation of power grids, and power systems equipment. Traditional harmonics monitoring system is mainly based on hardware, Because of its simple function; it has a lot of disadvantages. This paper presents a design scheme of harmonics measurement and analysis system based on LabVIEW and FFT (fast Fourier transformation). The method of Detection, the composition of hardware and the harmonic measurement and analysis module block diagram are introduced.
Harmonic Analysis
Block diagram
Harmonic
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This paper is to present the harmonic phenomenon. The Fourier series is the tool for harmonic analysis in order to interpret waveforms behavior due to nonlinear loads is carried out. Some harmonics measurements for nonlinear loads are also observed. The harmonics theory, definition of harmonic quantities, related harmonics problems in power distribution systems are explained. Also, filter applications such as passive filter in overcoming harmonic problems are discussed. This paper also investigate the recent developments for active power filter uses power electronic switching to generate harmonic currents that cancel the harmonic currents from a nonlinear load is then described.
Harmonic Analysis
Harmonic
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Harmonics in a power system caused by highly nonlinear devices degrade its performance. Controlling and reducing such harmonics have been a major concern of power engineers for many years. The power system harmonic analysis is the process of calculating the magnitudes and phases of the fundamental and higher order harmonics of system signals. The frequency domain solution method is one of the major mathematical approaches for such analysis. The paper discusses the frequency domain solution method in the power system harmonic analysis. It identifies harmonic sources and their effects on power system operation. It also discusses computer applications of such method.
Harmonic
Harmonic Analysis
Fundamental frequency
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Inter-harmonics are defined as the spectrum components that have frequencies between two harmonics. This letter points out that these fractional-harmonic components are not always the result of actual inter-harmonic sources. The signal sampling window size and position for Fourier analysis, as well as the time-varying characteristic of the signals, can all be factors leading to the so-called inter-harmonic components. Case studies illustrate that the inter-harmonic definition can be misleading and needs to be improved.
Harmonic Analysis
Harmonic
Power system harmonics
Position (finance)
SIGNAL (programming language)
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A method for analysis of signals containing harmonics and inter-harmonics is presented and discussed. This method is primarily developed for analysis of power system signals which contain harmonic and inter-harmonic components. However, usefulness of the proposed technique goes beyond the area of power systems and it can be employed for other applications which require accurate and adaptive extraction of unknown frequency components of a periodic signal in noisy environment. Novel structure of the proposed technique allows accurate estimation of weak components buried in noise and in the presence of large artifacts which may be located close to each other in the frequency spectrum.
Harmonic Analysis
Harmonic
SIGNAL (programming language)
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Harmonics in a power system caused by highly non-linear devices degrade its performance. Controlling and reducing such harmonics have been a major concern of power engineers for many years. The power system harmonic analysis is the process of calculating the magnitudes and phases of the fundamental and higher order harmonics of system signals. The frequency domain solution method is one of the major mathematical approaches for such analysis. It is a powerful tool to study frequency dependence, system equivalents, frequency response, and power system harmonics. The paper discusses the frequency domain solution method in the power system harmonic analysis. It pinpoints harmonic sources and their effects on power system operation. It also reveals the advantages and disadvantages of the method and points out its suitable application in harmonic computations
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Harmonic Analysis
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To resolve the harmonics pollution of medium frequency electric furnace in a steelwork, power quality monitoring is conducted for power source in steelwork and substation. By the analysis of test data, the 11th, 13th, 17th harmonic are the main reason for the pollution of power quality. The effective measures were put forward for users to prevent harmonics pollution, Effectiveness of the measures was verified by the comparison data before and after treatment.
Harmonic Analysis
Harmonic
Power system harmonics
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To resolve the harmonics pollution of medium frequency electric furnace in a steelwork, power quality monitoring is conducted for power source in steelwork and substation. By the analysis of test data, the 11th, 13th, 17th harmonic are the main reason for the pollution of power quality. The effective measures were put forward for users to prevent harmonics pollution, Effectiveness of the measures was verified by the comparison data before and after treatment.
Harmonic Analysis
Harmonic
Power system harmonics
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High Precise Harmonic Analysis Based on Auto-increase Frequency and Zeroing Spectral-Line Amplitudes
This paper describes two high precise harmonic analysis methods to find and analyze the harmonics of complex power network signals accurately and completely, the first one analyzes the harmonics by setting appropriate loop variant to make the frequency increase automatically, the second one zeroes spectral-line amplitude to analyze the harmonics. Four-item Nuttall window and triple-spectrum-line interpolation algorithm are chosen to improve the precision of two methods in this paper. The precision of the two methods under the stable fundamental frequency are studied, and the precision of the two methods under fluctuant fundamental frequency is also researched.
Harmonic Analysis
Harmonic
Interpolation
Fundamental frequency
Window function
Line (geometry)
Power system harmonics
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