Produção Nacional
Revisado por pares
Operation of a Grid-Tied Cascaded Multilevel Converter Based on a Forward Solid-State Transformer Under Unbalanced PV Power Generation
2018; Institute of Electrical and Electronics Engineers; Volume: 54; Issue: 5 Linguagem: Inglês
10.1109/tia.2018.2827002
ISSN1939-9367
AutoresFernando Amaral, Thiago M. Parreiras, Gideon C. Lobato, Alysson Augusto Pereira Machado, Igor A. Pires, Braz J. Cardoso Filho,
Tópico(s)Microgrid Control and Optimization
ResumoThe application of cascaded multilevel converters in large-scale photovoltaic plants connected to the utility grid has many advantages, such as the absence of sinusoidal filters and line-frequency transformers. Improved overall performance under partial shading conditions is possible due to the distribution of arrays among a large number of maximum power point trackers. In this situation, although the cells operate at different power levels, the three-phase currents injected into the point of common coupling must be balanced. A suitable control technique is required to achieve this goal. This paper presents a complete algorithm to handle three-phase power balance and single-phase power harvesting simultaneously. Simulation results assuming a medium-voltage system connected to a typical utility grid illustrate the dynamic and steady-state performance capability of the proposed strategy. Experimental results of a low-voltage, solid-state transformer-based, three-cell prototype are also included.
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