Results 261 to 270 of about 31,734 (309)
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World Pumps, 2009
ABB's Kari O Kovanen looks at methods used to reduce harmonic distortion produced by variable speed drives, including reactors, multi-pulse solutions and passive harmonic filters, and also refutes some of the criticisms of low harmonic drives made by some commentators.
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ABB's Kari O Kovanen looks at methods used to reduce harmonic distortion produced by variable speed drives, including reactors, multi-pulse solutions and passive harmonic filters, and also refutes some of the criticisms of low harmonic drives made by some commentators.
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Harmonic and interharmonic distortion modeling in multiconverter systems
IEEE Transactions on Power Delivery, 1995The problem of modeling multi-power converter systems in presence of harmonic and interharmonic distortion is considered. Specifically, current source rectifiers are considered as distortion sources, some supplying DC motors and the remaining supplying inverters feeding AC machines.
R. CARBONE +3 more
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Harmonic distortion in nearly sinusoidal oscillators
European Transactions on Telecommunications, 1990AbstractAn approach for calculation of harmonic content (h) in nearly sinusoidal oscillators is presented. It uses Volterra series to develop explicit expressions, which are then used to discuss the dependence of h and the dependence of amplitudes of harmonics upon the feedback and upon the oscillation‐amplitude.
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2001
Having run a harmonic study, bus harmonic voltages, line harmonic currents and voltage and current distortion factors are calculated and compared to limits set by standards. If the limits are exceeded, various filtering alternatives are simulated and examined to resolve resonance problems and bring the system into compliance with known standards.
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Having run a harmonic study, bus harmonic voltages, line harmonic currents and voltage and current distortion factors are calculated and compared to limits set by standards. If the limits are exceeded, various filtering alternatives are simulated and examined to resolve resonance problems and bring the system into compliance with known standards.
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Distortion: Total harmonic distortion in an asymmetrically clipped sinewave
IEEE Instrumentation & Measurement Magazine, 2011The application of a signal to an electronic system such as an amplifier invariably results in an output that is, in some sense and to some extent, a distorted version of that input signal. The application to which the system is put is a major determiner of whether or not the distortion can be neglected or, at least, of how much distortion can be ...
Stephen Dyer, Justin Dyer
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Total Harmonic Distortion Decomposition Depending on Distortion Origin
IEEE Transactions on Power Delivery, 2005The total harmonic distortion (THD) ratio is a well-known parameter that characterizes the distortion degree at a specific point of the grid. In this paper, a decomposition of the THD will be presented in order to determine the responsibility of the distribution company and the electrical energy consumer for the harmonic distortion measured at the ...
A. Ortiz +5 more
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IEEE Power Engineering Society Summer Meeting,, 2003
Harmonic distortion limits recommended by the majority of known standards are for steady-state harmonics. The harmonic distortions measured in the field, however, vary with time. How to apply the steady-state limits to the actual measured harmonics has been a concern for verifying compliance to harmonic standards.
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Harmonic distortion limits recommended by the majority of known standards are for steady-state harmonics. The harmonic distortions measured in the field, however, vary with time. How to apply the steady-state limits to the actual measured harmonics has been a concern for verifying compliance to harmonic standards.
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Harmonic distortion. Genesis to revelation?
Proceedings: Electrical Insulation Conference and Electrical Manufacturing and Coil Winding Conference, 2002With the recent developments in personal computers and their widespread use in exploiting the Internet, there has been a resulting demand for high speed communications. The use of conventional telephone networks poses a significant problem for error-free data transmission by modem.
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Overview on sources of harmonic distortion
IEE Colloquium on Sources and Effects of Harmonic Distortion in Power Systems, 1997Harmonics have been present in power systems since the very early stages of AC system development. The principal reason for this is that when the battle between AC and DC systems was resolved in favour of AC systems the one piece of equipment which fought a rearguard battle was the DC motor. It could be controlled in a manner which AC motors could not,
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Harmonic distortion in commercial establishments
IEE Colloquium on Sources and Effects of Harmonic Distortion in Power Systems, 1997Many commercial systems are private 400 V supplies. A large number of distorting loads have been connected at these sites with the result that the source current waveform may be distorted. Consequently, excessive harmonic voltages may be generated. Other commercial supplies may be connected to systems which contain excessive distortion. This problem is
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