**5. Conclusions**

In this work a grid-tied PV system configuration based on a series connection of three-level T-type inverter cells was described and validated. The proposed power topology merged the benefits of multistring configurations with more than one independent MPPT capability and the benefits of cascade H-bridge converters, generating a five-level output voltage waveform in the AC terminals. The proposed topology, modulation and control scheme were validated experimentally in a reduced scale power prototype with a straightforward implementation. Additionally, the proposed control strategy was evaluated under steady-state and unbalanced power conditions, ensuring a decoupled operation between both power cells. Finally, a brief comparison for key merit figures was included, where the main advantages of the proposed topology among other T configurations were highlighted, giving rise to the possibility of enhancing the power extraction from the PV side due to the multi-string configuration.

**Author Contributions:** C.V. conceived, designed and performed the experimental evaluations; S.K. provided insight on the power topology and conceptual solution, and was responsible of supervision throughout the work; C.A.R. wrote the manuscript and was part of the development team of the experimental test-bench, M.A.P. was responsible for the guidance during the prototype design stage, T.M. and M.M. provided relevant key theoretical and technical suggestions.

**Funding:** The authors gratefully acknowledge the financial support provided by CONICYT REDES 170217, AC3E (CONICYT/BASAL/FB0008), SERC Chile (CONICYT/FONDAP/15110019), CONICYT + PAI CONVOCATORIA NACIONAL SUBVENCION A INSTALACION EN LA ACADEMIA CONVOCATORIA 2018 + PAI77180032.

**Conflicts of Interest:** The authors declare no conflict of interest.
