In the past, no attention was paid to the kinds of sources by which loads were supplied and the only
energy resource supplying electrical demand was the upstream grid. Recently, due to the appearance
of new technologies in the field of energy resources such as distributed generation systems, operators
are encouraged to use these resources along with upstream grid to ensure a reliable power to the load
and reduce the role of upstream grid in supplying electrical demand. In the proposed paper, several
renewable and non-renewable energy sources like photovoltaic system (PV), fuel cell (FC) and battery
storage are integrated in a grid-connected hybrid energy system to supply energy demand. In this paper,
a multi-objective optimization model is proposed to solve the cost-emission problem of battery/PV/fuel
cell hybrid system in the presence of demand response program (DRP). Two conflicting objective functions namely minimization of total cost of hybrid system and reduction of CO2 emission are the main goal
of proposed multi-objective model. The proposed model is solved by weighted sum technique and the
best possible solution is selected by employing fuzzy satisfying approach. DRP transfers some amount
of load from peak periods to other periods which flattens the load curve and minimizes total cost of system. A mixed-integer linear program is used to model the proposed cost-emission operation problem of
hybrid system and it is solved by GAMS software. Two different cases have been studied to show the
effects of DRP and the results are compared.