Quadrature Voltage Compensation in the Isolated Multi-Modular Converter

Cristian Verdugo, Jose Ignacio Candela and Pedro Rodriguez
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Cristian Verdugo: Electrical Department, Technical University of Catalonia, 08222 Terrassa, Spain
Jose Ignacio Candela: Electrical Department, Technical University of Catalonia, 08222 Terrassa, Spain
Pedro Rodriguez: Electrical Department, Technical University of Catalonia, 08222 Terrassa, Spain

Energies, 2021, vol. 14, issue 3, 1-21

Abstract: Series connections of modules in cascaded multilevel converters are prone to power imbalances due to voltage differences on their DC side. When modules are connected to direct current (DC) sources, such as photovoltaic panels, the capability of withstanding power imbalances is crucial for generating the maximum power. In order to provide a possible solution for this requirement, this paper proposes a control strategy called Quadrature Voltage Compensation, which allows a wide range of power imbalances. The proposed control strategy regulates the power by introducing a circulating current between the arms and a phase angle in the output voltage. The impact of the circulating current and its effect on the phase voltage are studied. To highlight the features of the proposed strategy, an analytical model based on vector superposition is also described, demonstrating the strong capability of tolerating power differences. Finally, to validate the effectiveness of the Quadrature Voltage Compensation, simulation and experimental results are presented for a three-phase isolated multi-modular converter.

Keywords: cascaded-transformer multilevel inverter; energy balance operation; isolated multi-modular converter (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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