A Four-Switch Three-Phase SEPIC-Based Inverter


The four-switch three-part (FSTP) inverter has been proposed as an innovative inverter design to reduce the cost, complexity, size, and switching losses of the dc-ac conversion system. Ancient FSTP inverter usually operates at 0.5 the dc input voltage; hence, the output line voltage cannot exceed this value. This paper proposes a unique style for the FSTP inverter based mostly on the topology of the single-ended primary-inductance converter (SEPIC). The proposed topology provides pure sinusoidal output voltages without needing for output filter. Compared to traditional FSTP inverter, the proposed FSTP SEPIC inverter improves the voltage utilization issue of the input dc offer, where the proposed topology provides higher output line voltage which will be extended up to the total value of the dc input voltage. The integral sliding-mode management is employed with the proposed topology to optimize its dynamics and to ensure robustness of the system during completely different operating conditions. Derivation of the equations describing the parameters design, components ratings, and also the operation of the proposed SEPIC inverter is presented in this paper. Simulation model and experimental setup are used to validate the proposed concept. Simulations and experimental results show the effectiveness of the proposed inverter.

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