: Due to the increase of load demand in future, the generation must also increase. The use of traditional
resources such as coal, diesel fuels etc., causes global warming which is leading us to shift to renewable energy
resources. Renewable energy resources may in include solar, wind, tidal as the source for production. These are
used in small quantities as Distribution Generators (DG) at different locations in a bus system. As the generation of
these sources is less when connected to grid, we call them as micro-grids. These micro grids generally use these
DGs to distribute power to loads, and involve power electronic elements to control the generation. It induces energy
into the system but also create a problem of harmonic distortions and voltage sags.
To eliminate these sags and harmonics in the micro grid system caused by the power electronic devices
employed by the renewable sources, we induce a UPQC (Unified Power Quality Conditioner) system. The UPQC
system eliminates the harmonics in the systems and restores the voltage of the micro-grid system. We introduce a
new topology called instantaneous reactive power (IRP) theory in the UPQC control to operate in a more efficient
way, by utilizing RES (Renewable Energy Sources) at the DC-link. The RES support the UPQC system by injecting
the active power generated by the resources through DC-link.
Cost Optimization Of Micro-Grid Of Renewable Energy Resources Connected With And Without Utility Grid
