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A Skewness Based Method for Diagnosis in Quasi-Z T-Type Grid-Connected Converters
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Orientador(es)
Resumo(s)
One of the very interesting converters for transformerless grid-connected PV
systems is the multilevel quasi-Z T-Type inverter. Besides their multilevel operation, it
presents voltage Boost capability and robustness to instantaneous switching between
power semiconductors of the same leg and capability to work in fault tolerant condition.
However, to ensure this capability, it is essential to ensure a fast and correct diagnosis
of the component under fault. Thus, this paper proposes a new method for the detection
of an open switch fault. The proposed approach uses the inverter AC line currents that
will be analyzed by a Skewness based method. The method has the capability to
distinguish the switch under fault. Besides that, it presents robustness to interferences
such as noise, as well is insensible to variations of the injected power into the grid.
Several simulation and experimental results will be presented in order to verify the
capability of the proposed method.
Descrição
Trabalho apresentado em 8th International Conference on Renewable Energy Research and Applications, 3-6 novembro 2019, Brasov, Romenia
Palavras-chave
Quasi-Z inverter (qZSI) T-Type Fault detection and diagnosis Skewness Grid-connected PV