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- Fault tolerant operation of three-phase 3 level T-Type qZS inverters using sliding mode current controllersPublication . Fernao Pires, Vitor; Foito, Daniel; Santos, Natalia; Cordeiro, Armando; Roncero Clemente, Carlos; Silva, J. F.Due to the boost characteristic and the several possible outputs of quasi-Z-source inverters (qZSI), these topologies can be valuable options to operate under fault conditions, provided the controller is able to take advantage of the available output states. Thus, the development of control systems to take advantage of the available outputs is needed. Hence, this paper focuses on the development of a control system to operate a three-phase three-level T-Type qZSI under fault tolerant conditions. The controller is based on a sliding mode current controller associated to a vectorial modulator selecting the available outputs. The proposed strategy for the controller and modulator is presented taking into consideration the normal and fault-tolerant requirements. The strategy also considers the balance of the capacitors under fault tolerant condition. The converter operating in both modes is tested through several simulation studies.
- Isolated quasi-switched boost integrated T-type DC-DC converter for DC microgridPublication . Ferreira, Daniel; Cordeiro, Armando; Rocha, Luís; Romero-Cadaval, Enrique; Roncero Clemente, Carlos; Silva, J. Fernando; Foito, Daniel; Martins, João F.; Fernao Pires, VitorOver the last few years, there has been a high demand for new or improved isolated DC-DC to fulfill requirements of applications related with RES. In this context, this paper introduces a new isolated DC-DC converter, for use in renewable energy applications. The topology proposed contains an Active quasi-switched Boost Three-Level T-type DC-DC converter with continuous input current at the converter input side, connected to a high-frequency step-up isolation transformer, and a voltage doubler rectifier (VDR) on the output side. The steady-state analysis of the proposed converter is presented and discussed. Simulation results are presented to verify the theory and performance of the converter.