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Input current ripples cancellation in bidirectional switched-inductor quasi-Z-source inverter using coupled inductors

This paper proposes a new topology of switched-inductor quasi-Z-source impedance networks which has a high boost capability and continuous input current with no ripples. The coupling inductor technique is utilized to cancel the ripples of the input current. In this topology, no additional components such as input filter are required to protect the source. In addition, the lifetime of the storage elements would be increased. It is a bidirectional topology which is able to exchange energy between AC and DC energy storages in both directions and completely avoid the undesirable operation modes. Simulation results have validated the proposed strategy and have been in accordance to mathematical results.