Single-stage single-phase multiport DC-AC inverter suitable for standalone applications due to its notable performance in different operation modes

A new multiport DC-AC converter is proposed for standalone and off-grid tied applications. The configuration converts power from DC to AC form in a single stage with suitable voltage gain. To increase the certainty of supporting power, the converter is designed to operate in four modes, including battery-alone mode. The other advantage of the presented work is supplying the output power during unbalanced voltage conditions of the input ports. The advanced features of the converter for being used in standalone applications are related to the suitable placement and structure of the bidirectional port. In addition, the configuration is designed in a way to contain appropriate structural properties such as the existence of a common ground between the DC section and inverter, continuity of input currents, configured by an acceptable number of components, and low-voltage stress on the DC-DC section's switches. Furthermore, it has an impedance network to protect the inverter's switches in a shoot-through state. To confirm the converter advantages from the mentioned points of view, it has been compared with similar configurations. A prototype rated at 110 V is prepared to demonstrate the advantages of the converter performance per different conditions. The results of the steady-state and transient experiments validate the suitability of the presented converter. A new multiport DC-AC converter is proposed for standalone and off-grid applications. It converts DC to AC power in a single stage with suitable voltage gain. The converter operates in four modes to ensure power supply reliability. It can supply power during unbalanced input voltage conditions. Key features include a bidirectional port, common ground, continuous input currents, efficient component count, and low switch voltage stress. An impedance network protects the inverter switches. Experiments on a 110 V prototype validate the converter's performance advantages over similar designs. image