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Renewable energy systems have developed wide interest to supply electricity in remote areas as well as for distributed power generation specially during peak loads. Fuel cell based power generation is also gaining popularity due to its cleanliness, portability and suitability for electricity and heat generation. This paper presents modeling of a fuel cell power plant in terms of fuel cell, converter and power system parameters, to facilitate operation with grid interface. The mathematical model is developed in per unit (PU) system using qd0 reference frame theory, to define the power flow (real and reactive) limits, which can be supplied by the fuel cell power plant. A single stage PWM inverter is selected as power electronic interface between fuel cell and grid.