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Keywords
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Grid-connected, Non-Isolated Converter, Multi-Level Inverter, Leakage Current, Model Predictive Controller.
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Abstract
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In this paper, an improved structure with model predictive control (MPC) is presented to eliminate leakage
current of grid-connected PV panels. The proposed topology consists of a PV panel in the input side, a non-isolated
DC/DC multilevel boost converter and a nine-level inverter at the output side. The DC-DC multilevel boost converter can
provide equal voltage levels in different rated power by controlling duty-cycle. The utilized dc-dc converter can increase
the output voltage of PV panel to produce desired values at the input ports of the nine-level inverter. In Non-isolated grid-
connected PV converters, there are parasitic capacitors between grid and PV panel which leads to the leakage current
flowing through parasitic capacitors to the system. It causes a safety problem, injection of harmonic current to the grid,
increasing losses, and efficiency reduction. In order to eliminate leakage current due to using the parasitic capacitor of
PV panel, MPC control method is utilized to achieve high overall efficiency. To confirm the operation of presented
structure and theoretical analysis, PSCAD/EMTDC software is used.
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