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An Improved Fault Location On Power System Transmission Lines Using Fuzzy Logic Approach
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1.5. FUZZY LOGIC FOR POWER SYSTEM PROTECTION
Fuzzy logic
can be said to be a problem-solving control system methodology, which
provides a simple way to arrive at definite conclusion based upon vague,
blurred, ambiguous, noisy, imprecise input information (Kaeler,2005).
It was first conceived by professor Lofti Zadeh of the University of
Clifornia in 1965. It incorporates a simple rule-based “IF X and Y THEN
Z†approach to solving control problem rather than attempting to model a
system mathematically. Fuzzy logic allows complex system design
directly from engineering experience and experimental results, thus
quickly rending solutions that can effectively describe the vagueness of
the real world. It uses an imprecise but very descriptive language to
deal with input data in a way that mimics a human operator.
Mathematical
formulations of real-world problems are derived under certain
restrictive assumptions. Conversely, there are many uncertainties in
various power system problems because power systems are large, complex
geographically widely distributed and influenced by unexpected new
challenges. These facts make it difficult to effectively deal with many
power system problems through strict mathematical formulations alone.
Fuzzy logic, among others is a powerful AI tool in meeting challenging
power system problems.
The following are the uncertainty and
imprecision in power systems which pose significant difficulties when
applying conventional techniques:
· Imprecise information
caused by human beings involved in the planning, management, operation
and control of power systems.
· Changing power system
operating conditions such as changes in load or generation and changes
in the topology of power systems.
· Inaccuracies caused by
voltage and current transducers or SCADA measurements/state estimations
or noise introduced through electromagnetic interference,
· Many fault conditions, include fault inception, fault location, fault types and fault path resistance.
The
aforementioned problems are compounded by their random nature. In this
respect, fuzzy logic (FL) has been investigated as a powerful tool in
the development of novel protective relays for transmission systems
(Aggarwal et al, 1997).
SOME FUZZY LOGIC BENEFITS INCLUDE
ØFuzzy logic is based on natural languages and is conceptually easy to understand
ØFL can resolve conflicting objectives
ØFL is tolerant of imprecise data and can handle ambiguity
ØFL is flexible and relatively easy to implement
ØFL can be built on top of the experience of experts or can be implemented with other techniques.
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ABSRACT - [ Total Page(s): 1 ]The problem of Electricity are enormous and can never be treated
completely until the fault department (maintenance) are improved upon
for urgent and rapid response to line faults.The present protection
scheme only isolates the lines in the event of faults, define the fault,
but leaves no proper information about the location of the fault.Faults
must occur on both the transmission and distribution lines but, the
problem is how fast can the fault be cleared when the maintenance team
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