harmonics book
TRANSCRIPT
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FUNDAMENTALS OF HARMONICS
Presented by:
Syed Khundmir T
Department of EleUniversity at Buff
khundmir@buffa
The BEST Group
THE BUFFALO ENERGY SCIENCE AND TECHNOLOGY-Win
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Harmonic Distortion
It is caused by non-linear devices. In such devices, the current is not proportional to applied vo
Most of the times, only odd harmonics are present in the sys
Vast majority of nonlinearities in the system are foundelements ie., loads.
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Voltage vs Current Distortion
Non-linear loads appear to be the source of harmonic current ininjects harmonic currents into the power system. Voltage distortion is the result of distorted currents passing t
linear, series impedance of the power delivery system.
Harmonic currents passing through the impedance cause a voltaeach harmonic. This results in voltage harmonic appearing at the
While the load current harmonics result in voltage distortion, inoted that load has no control over voltage distortion.
The above mentioned phenomenon is shown in the figure presentslide:
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Contd
Control over harmonic currents takes place at the end-user ap Control over the voltage distortion, assuming the harmon
injection is within reasonable limit, is excercised by the entcontrol over the system impedance, which is often the utility
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