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This work presents the modeling of the control loop for the Five Level (5L) T-Type Neutral-Point Clamped (NPC) converter, for grid-tie photovoltaic application. The control system includes the converter output current control loop and the differential voltage control loop of the input voltage. The results are evaluated by means of a 3kW prototype.
The study of a totally passive snubber applied to the T-type NPC converter is presented in this paper. The snubber circuit aids all commutations in all the switches. The voltage across the switches is clamped in a value close to half of the total input voltage. The description of the operation is presented in this paper.
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