Abstarct: Feul cells are DC voltage sources with high current density that can be connected to power systems using power electronic converters for supplying a fraction of the load power. In this thesis, a control system for power injection of a DC voltage source such as feul cell to a single-phase grid using increasing DC to DC converters (Boost) and DC to AC converters (Inverter) is designed and implemented. The role of boost converter in this system is producing a greater and regulated output voltage for using in the next stage DC to AC converter. The model-average modeling has been used for mathematical describtion of the boost converter. Then, assuming that this converter is always in continuous conduction mode (CCM) , a nonlinear control approach (total sliding-mode control ) is applied. A DC /AC converter on the grid side is responsibe for the control of the injected power to the grid. For this controller, only the zero crossing time of the grid voltage phase is fed back. Simulation results, show the effectiveness of the proposed control method in regulating the boost converter and power injection. To examine the practical performance of the proposed method, an experimentel setup including a boost converter, a single-phase inverter and other required elements such as inductive filter, electronical interface boards, processing unit and so on, have been designed and manufactured. The experimental results and their comparison with simulation results show the accuracy and effectiveness of the proposed methods.