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Books > Professional & Technical > Energy technology & engineering > Electrical engineering
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Protective Relaying of Power Systems Using Mathematical Morphology (Paperback, Softcover reprint of hardcover 1st ed. 2009)
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Protective Relaying of Power Systems Using Mathematical Morphology (Paperback, Softcover reprint of hardcover 1st ed. 2009)
Series: Power Systems
Expected to ship within 10 - 15 working days
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The basic principle of protective relaying of power systems has not
changed for more than half a century. Almost all power system
protective relaying algorithms are dominated by integral transforms
such as the Fourier transform and the wavelet transform. The
integral transform can only provide an average attribute of the s-
nals or their components. The accuracy of the attribute extraction
is signi?cantly sacri?ced by the assumption of periodicity of the
signals if the integral transform is appliedto transientsignals.
Itis also wellknownthatthe signalsare liable to bec-
taminatedbynoiseintheformofexponentiallydecayingDCoffsets,highfrequency
transients, harmonic distortion, errors caused by non-linearityin
the response of the sensors, and unwanted behaviour of power
systems. This contamination is often provoked by fault conditions,
just at the time when the protection relay is required to respond
and trip the circuit breaker to limit damage caused by the fault.
On the other hand, as we know, in most protection relays, complex
computation has to be undertakenwithin a sampling interval, no
matter how small the interval, to calculate the coef?cients
relevantto the attributes of the signals byusing the integral
transform based on a window of samples, and to calculate the
relaying algorithms, which are derivedto representthe relationship
betweenthese coef? cientsandpower system faults. If fast transients
and high-order harmonics are to be addressed, - tra computing power
and facilities are required. Therefore, it can be seen that the
current power system relaying algorithms suffer from many problems
including - curacy, fast responses, noise, disturbance rejections
and reliability.
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