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The paper presents a model and controllers of fuel-cell -based distributed generation systems (DG) in a Grid. A dynamic model of the fuel cell is considered. To boost low-output DC voltage of the fuel cell to high DC voltage and to compensate for its slow response during the transient, zeta converter is adopted and their controllers are designed. Voltage control technique was investigated by simulation. Distributed Generation (DG) units are connected to the grid increasing nowadays for several reasons. Most DG units are relatively small and connected to the distribution network. A large part of the DG units connected to the grid via power electronic converters. The main task of the converters is to convert the power that is available from the prime source to the correct voltage and frequency of the grid. The general objective of this paper is to investigate how the power electronic converters can support the grid and solve power quality problems. An IEEE-5 bus system is considered with fuel cell source for this work to validate the power electronic converter using MATLAB/ Simulink.