Three-level single-phase quasi-Z source inverter with active power decoupling circuit

Single-phase inverters suffer from double-frequency ripple of the input power. For mitigation, an input capacitor is applied but the fluctuation range of power across it is limited according the desired fluctuation in the dc-link voltage. To realize power decoupling without changes in the main circuit and in the control strategy of it, an additional independent power decoupling circuit can be applied, where the buffer capacitor works mainly as a storage element that operates with a part of the ripple of the input power. This paper proposes a three-level neutral-point-clamped impedance source based converter with active decoupling circuit connected to the internal capacitors. Our simulation results validate the proposed solution. Its advantages are very simple control strategy and the possibility of storage battery connection.

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