Synchronous Reference Frame current control of Aalborg-type PV invertersSynchronous Reference Frame current control of Aalborg-type PV inverters Πλήρης Δημοσίευση σε Συνέδριο Conference Full Paper 2023-05-222021enThis work was performed within the framework of the project “eSOLAR: Principle and control of high-efficiency Buck-Boost type Photovoltaic inverter” of the program “Bilateral and Multilateral Research & Technology Co-operation between Greece and China”, funded in Greece by the Operational Program “Competitiveness, entrepreneurship and Innovation 2014-2020” (co-funded by the European Regional Development Fund) and managed by the General Secretariat of Research and Technology, Ministry of Education, Research, and Religious Affairs under the project eSOLAR/T7ΔKI-00066.Transformerless photovoltaic (PV) inverters with voltage step-up capability are currently the preferred interface for integrating PV generation to a single phase of the electric grid. Among the different topologies employed for such inverters, dual-mode time-sharing topologies offer high conversion efficiencies, but present control challenges that can result in significant grid current distortion. Existing control approaches operate in the stationary reference frame and use different controllers for the Buck and Boost modes of operation. This paper presents a new current control approach for Aalborg-type Buck in Buck, Boost in Boost PV inverters, which operates in the Synchronous Reference Frame and uses a common controller for Buck and Boost operation. The proposed method achieves high output current quality even at unfavourable conditions of low PV voltage and/or power levels. Simulation results in MATLAB-Simulink are presented to illustrate that it can reduce the Total Harmonic Distortion (THD) of the grid current by two to three times as compared to the existing alternative.http://creativecommons.org/licenses/by/4.0/2021 23rd European Conference on Power Electronics and Applications Orfanoudakis, Georgios I Koutroulis Eftychios Κουτρουλης Ευτυχιος Foteinopoulos Georgios Φωτεινοπουλος Γεωργιος Wu Weimin Institute of Electrical and Electronics Engineers Dual-mode time-sharing inverter Buck in Buck, Boost in Boost inverter Step-up inverter Aalborg inverter Transformerless inverter PV inverter Current control