Stable operation of grid-connected converters with the LCL filter is essential. Variations grid impedance and consequently, variations resonance frequency, can push system toward instability. Also, delay that comes from sampling PWM, could worsen stability condition. Thus, control should be designed by considering these non-ideal factors. To fill in this gap, brief presents an effective but sim...

Three-level Z-source inverters are recent single-stage topological solutions proposed for buck-boost energy conversion with all favorable advantages of three-level switching retained. Despite their effectiveness in achieving voltage buck-boost conversion, existing three-level Z-source inverters use two impedance networks and two isolated dc sources, which can significantly increase the overall ...

Environmental conditions and operational modes may significantly impact the distortion level of the injected current from single-phase grid-connected inverter systems, such as photovoltaic (PV) inverters, which may operate in cloudy days with a maximum power point tracking, in a non-unity power factor, or in the low voltage ride through mode with reactive current injection. In this paper, the m...