Integrated Model Predictive Control of a Single-Phase Multilevel T-type Converter for a Photovoltaic Grid Connected System under Failure Conditions
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LGEA Laboratory, Department of Electrical Engineering, Larbi Ben M’hidi University, Oum El Bouaghi, Algeria
Corresponding author
Wassim Boudja
Electrical Engineering and Automatic Laboratory (LGEA), Faculty of Sciences and Applied Sciences, Larbi Ben M'Hidi University, Oum El Bouaghi 04000, Algeria
Power Electronics and Drives 2023;8 (43):142-164
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ABSTRACT
The article presents two contributions: the first is an optimised control structure for photovoltaic grid connected systems (PVGCSs).
The power chain is composed of two cascaded power converters, namely, a boost converter and a five-level T-type multilevel
converter. Traditionally, each power converter is controlled by a separate mode control (SMC) from the other, which is computationally
intensive since each converter requires its own control system, which is not practical. The suggested control, called integrated finite
set model predictive control (IFS-MPC), allows controlling cascaded converters at the same time in one stage, instead of controlling
them separately. Consequently, the overall implementation system is widely reduced. The second contribution of the article is a
modified IFS-MPC called modified integrated finite set-model predictive control (M-IFS-MPC), which ensures the correct functioning
of the grid-tied PV system under certain faults in converter components. Indeed, when one of the DC-link capacitors fails or when
one of the auxiliary switches breaks down, by selecting an appropriate choice of the DC-link capacitors’ voltage reference, the
proposed design allows a normal operation without intervention on the power circuit.