A non linear vector corrected measurement system for device and system characterisation
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This paper describes a vector corrected nonlinear measurement system based around a microwave transition analyser and spectrum analyser. This system can be used to measure intermodulation distortion as well as device output harmonic performance under different drive levels, DC bias and fundamental load impedance conditions. The system can also plot the dynamic load lines during measurement. Three applications of the system will be described showing it's versatility in large signal measurements. Firstly, the system will be used to study harmonic generation in HEMT devices, identifying the causes for harmonic nulls in the second and third harmonics with increasing input power and their direct relation to the output IV curves. Secondly the system will be used to measure the phase modulation behaviour of a 5.8 GHz injection locked MMIC oscillator, and finally the systems use in characterising the IMD performance of an active device in the bias plane is described.Keywords:
Harmonic
Harmonic Analysis
SIGNAL (programming language)
Distortion (music)
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.
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Harmonic Analysis
Fundamental frequency
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In Industrial Distribution Power System, the use of electronic devices such as motor drives, rectifiers or converters, power supplies and power electronic devices has been increased tremendously from last decade. In such a systems, switching operations are more in their regular work. It causes distortion in supplied waveform (Harmonics). This increases the Total Harmonic Distortion (THD) of Industrial Distribution Power System which is considered as the main reason for the power quality problems. This paper includes the sources of the harmonics, effects of the harmonics and the recommendations for correction of these problems of power quality resulting from harmonic distortion in the Industrial Distribution Power System.
Distortion (music)
Harmonic
Harmonic Analysis
Power Electronics
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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.
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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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Using time-harmonic analysis, a method to identify load-dependent parameters of the induction motor (IM) equivalent circuit considering iron-loss is presented. Time-harmonic analysis is generally used for IM analysis due to its fast speed. However, iron-loss caused by harmonics cannot be calculated, since it regards that all parameters are sinusoidal. Thus, time-transient analysis is used to consider harmonics in general. A complete period of rotor flux density is needed for iron-loss calculation, and is inversely proportional to slip. Since IM is operated under very low slip condition, it takes immoderate time. Accordingly, novel analysis method for flux density harmonics for calculation of iron-loss. Based on the nature that result of time-harmonic analysis is in the form of complex number, method, which enables harmonics analysis with very short analysis range, is presented. Finally, the impact of considering iron-loss to equivalent circuit is investigated to demonstrate the accuracy improvement.
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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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