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Pulsar wind nebulae (PWNe) have been established as the most populous classof TeV gamma-ray emitters. Since launch, the Fermi Large Area Telescope(LAT)identified five high-energy (100MeV <E< 100 GeV) gamma-ray sources asPWNe, and detected a large number of PWNe candidates, all powered by young andenergetic pulsars. The wealth of multi-wavelength data available and the newresults provided by Fermi-LAT give us an opportunity to find new PWNe and toexplore the radiative processes taking place in known ones. The TeV gamma-rayunidentifiedsources (UNIDs) are the best candidates for finding new PWNe. Using45 months of Fermi-LAT data for energies above 10 GeV, an analysis wasperformed near the position of 58TeV PWNe and UNIDs within 5deg of the GalacticPlane to establish new constraints on PWNe properties and find new clues on thenature of UNIDs. Of the 58 sources, 30 were detected, and this work providestheir gamma-rayfluxes for energies above 10 GeV. The spectral energydistributions (SED) andupper limits, in the multi-wavelength context, alsoprovide new information on the source nature and can help distinguish betweenemission scenarios, i.e. between classification as a pulsar candidate or as aPWN candidate. Six new GeV PWNe candidates are described in detail and comparedwith existing models. A population study of GeV PWNe candidates as a functionof the pulsar/PWN system characteristics is presented.

Constraints on the Galactic Population of TEV Pulsar Wind Nebulae Using Fermi Large Area Telescope Observations