33 documents found, page 1 of 4
Isolated quasi-switched boost integrated T-type DC-DC converter for DC microgrid
Ferreira, Daniel; Cordeiro, Armando; Rocha, Luís; Romero-Cadaval, Enrique; Roncero Clemente, Carlos; Silva, J. Fernando; Foito, Daniel; Martins, João F.Over 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...
Transformerless ultra-high gain buck-boost DC-DC converter with single-switch o...
Cordeiro, Armando; Gamboa, Paulo; Luís, Ricardo; Fonte, Pedro M; Monteiro, Joaquim; Martins, João F.; Silva, J. Fernando; Foito, DanielThis paper introduces a new DC-DC power converter topology capable of both step-up and step-down voltage conversion, with an exceptionally high voltage gain ratio.. Besides the high extension of the voltage gain range, the converter is also characterized by the use of a single switch. Moreover, the stress imposed on the switch's voltage is minimized, enabling the utilization of low-voltage, low RDS-ON MOSFETs. ...
Diagnosing Power Transistor Faults in Multilevel T-Type Based Nine Switch Inver...
Monteiro, Joaquim; Amaral, Tito; Silva, J. Fernando; Pinto, Sonia; Fernao Pires, VitorNine-switch voltage source inverters (NSVSI) are DC-AC converters that utilize a reduced number of switches, making them advantageous for dual or six-phase motors. To enhance the quality of the output voltage and provide fault tolerant capability, NSVSI topologies, like the T-Type-based NSVSI, have been modified to operate as multilevel converters. However, to ensure fault-tolerant capability, a fault diagnosis...
A DC-DC Converter with Capability to Support the Voltage Balance of DC Bipolar ...
Pires, Vítor; Foito, Daniel José Medronho; Cordeiro, Armando; Silva, J. FernandoBipolar DC microgrids are now starting to become an interesting solution for power distribution. Although presenting several advantages over DC unipolar microgrids, bipolar DC has the intrinsic problem of voltage unbalance that may appear depending on the converter topology and load sharing. Therefore, this paper presents a new DC-DC converter topology that can be used with renewable energy sources and has the ...
Control transition mode from voltage control to MPPT for PV generators in isola...
Fernao Pires, Vitor; Cordeiro, Armando; Foito, Daniel; Silva, J. FernandoThe integration of photovoltaic (PV) power sources on a large scale into grid-tied and islanded solutions is now a reality. Despite the fluctuating characteristics of solar energy, the direct current (DC) nature of PV sources is highly compatible with DC microgrids compared with AC solutions. However, as more PV sources are being installed, challenges related to the control of DC microgrids are also increasing,...
Control of PV distributed systems based on three-phase triple inverters to supp...
Fernão Pires, V.; Foito, Daniel; Cordeiro, Armando; Silva, J. FernandoThis paper is focused on the control system for photovoltaic (PV) generators using three-phase triple inverters. These inverters allow for a distributed PV system, and at the same time, they provide AC multilevel operation. The proposed controller is designed to allow the operation of the inverter in a way that it can extend support to the grid with ancillary services. One of the ancillary services that the thr...
A vector voltage modulator for a dual inverter with a floating bridge to operat...
Fernao Pires, Vitor; Foito, Daniel; Cordeiro, Armando; Silva, J. FernandoThe dual inverter multilevel converter is characterized by a simple structure using two well-known three phase bridge inverters supplied by two independent DC sources. However, it can be supplied only by a single DC source if one of the bridges uses just a floating DC capacitor. In this case the control is more complex since it is also required to ensure the capacitor voltage regulation. Besides this, if a faul...
Backstepping predictive control of hybrid microgrids interconnected by neutral ...
Barros, J. Dionísio; Rocha, Luis Lamy; Silva, J. FernandoIn this work, DC and AC parts of hybrid microgrids are interconnected by a neutral point clamped-NPC converter controlled using a new backstepping predictive (BP) method. The NPC converter is controlled to operate in the DC microgrid voltage control mode or in the AC microgrid power control mode. The novel backstepping predictive controller is designed using the dq state space dynamic model of the NPC converter...
Sliding mode vector control of grid-connected PV multilevel systems based on tr...
Foito, Daniel; Fernao Pires, Vitor; Cordeiro, Armando; Silva, J. FernandoThe use of distributed architectures for PV panels present several advantages over centralized solutions, such as better harnessing of the generated energy and improved reliability of the system. Therefore, several inverter structures have been proposed to ensure proper operation of distributed architectures and at the same time generate multilevel voltages. A newly proposed structure uses three three-phase two...
A model predictive control for the T-Type qZS inverter with capacitor imbalance...
Monteiro, Joaquim; Fernao Pires, Vitor; Silva, J. FernandoThe quasi-Z-source (qZS) inverter has emerged as one interesting solution for several types of applications, like those associated with renewable energies. The qZS inverter presents a wide range voltage gain and does not require dead times improving the system reliability. One of the most interesting qZS inverter topologies is the T-Type multilevel converter. Nevertheless, the T-Type multilevel may have issues ...