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In sinusoidal situations, power factor definition is unique and expressive. However in nonsinusoidal situations and/or nonlinear load different power factors are proposed to express these situations. In this paper a new fuzzy based representative quality power factor is introduced to represent these power factors. The proposed representative quality power factor (RQPF) was applied to different cases, linear, nonlinear, sinusoidal, nonsinusoidal considering lagging and leading power factor. It is shown that the new RQPF is expressive and accurately represents the existing power factors in all cases and in all situations. Taking into consideration the advantages of the fuzzy systems such as simplicity, ease of application, flexibility, speed and ability to deal with imprecision and uncertainties, this factor can be useful for power quality evaluation, cost-effective analysis of PQ mitigation techniques, as well as billing purposes, in these situations.
Date of Publication: April 2008