This paper proposes an optimal design of single hmed shunt passive filter for the Underground
Ramsis Metro Substation (URMS) using Linear Programming technique as a conventional I technique and fuzzy linear programming (F'LP) technique as a modem technique. The optimal
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filter parameters are obtained to overcome the harmonics generated in the voltage and current
waveforms, due to the non-linear characteristics of the rectifiers, which distort the voltage and
currents waveforms at the point of common coupling (PCC). The harmonic levels are analyzed at
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I different loading conditions using the Fast Fourier Transform (FFT) on MATLAB optimization
i program. The proposed optimal design of harmonic filter is based on minimizing the cost of the
1 filter parameters and its losses. Both techniques are applied on the system under study. From the
1 results, the THD levels of the line cunent and the bus voltage are reduced to be within the standard
limits. A comparison between the optimal design filters are carried out using t