In many industrial applications it is required to convert DC voltage to Three-Phase AC voltage with amplitude greater than the input DC voltage. Distributed generation systems in which the amplitude of generation source is smaller than the amplitude of grid voltage, U in which the amplitude of DC input reserve voltage is smaller than nominal voltage of supplied load and also Electic Vehicles in which it is required to both boost and invert DC input voltage, are examples of these industrial applications. In these applications, supplied load may be a non sinusoidal load such as a computer or electrical drive with an input rectifier. The input rectifier draws a non sinusoidal current from the inverter. Because of non sinusoidal shape of the current and its severe changes, inverter operation is distorted. Also in some cases, supplied load is an unbalanced load. Additionally, if several load are being supplied in parallel by the inverter, connection and disconnection of each loads causes the inverter to experiences sudden load changes. So, an inverter should be able to handle all these challenge and supply the load with a balanced Three-Phase AC voltage with fixed and desired amplitude. In this dissertation, a new three phase inverter with boost ability of input voltage is proposed, designed and analyzed. High efficiency, less number of switches and lower cost and volume are distinguished characteristics of proposed inverter. In the proposed inverter switches with negative voltage blocking capability are also not required. Because of nonlinear behavior of the system and existence of nonlinear load, two nonlinear controllers including a sliding mode controller as well as a cascade controller based on feedback linearization theory with fixed switching frequency are designed and applied to the inverter. Simulation results with PSIM software in various conditions such as nonlinear load, change in the load and variation of the input voltage are carried out to verify the correctness of the proposed inverter and its controllers. A laboratory setup of proposed inverter equipped with its sliding mode controller is implemented completely with analogue circuits. C.T and Hall Effect sensor are not used in the setup. At the end, experimental results are obtained and compared with simulation results. They verify and confirm the correctness of proposed inverter in addition to good operation of designed controllers. Keywords: Boost inverter, sliding mode controller, cascade control loop, fixed switching frequency, differential inverter.