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- A DC-DC converter for bipolar DC microgrids with voltage balance capability to supply a multilevel SRM drivePublication . Fernão Pires, V.; Foito, Daniel; Pires, A. J.; Cordeiro, Armando; Martins, J. F.In this work it is proposed a DC-DC converter to supply a multilevel Switched Reluctance Machine (SRM) drive. The proposed converter was designed to be integrated in a bipolar DC microgrid. Usually, this kind of microgrid requires a support to avoid unbalances between the poles. Thus, the proposed converter also integrates voltage balance capabilities allowing the required support to the bipolar DC microgrid. Besides that, the converter can also supply the drive using only one of the poles. The behavior and operating modes of the converter will be described in detail. Several simulation tests will also be provided. From these tests, the behavior and the several operation modes of the DC-DC as well as the multilevel SRM drive supplied by this converter will also be presented and analyzed.
- Multilevel converter with fault-tolerant capability for the switched reluctance machinePublication . Fernão Pires, V.; Cordeiro, Armando; Foito, Daniel; Pires, A. J.Many critical systems require permanent operation even in a situation of a fault. In this way, electrical drives that are associated to these systems must have fault-tolerant capability. One of the machines that are used in many systems is the switched reluctance machine (SRM). To achieve the best performance with a wide speed range, multilevel converters are one of the adopted options. Thus, this paper presents a new multilevel converter for the SRM with fault-tolerant capability. The proposed solution allows to maintain the drive at operation for both conditions of opencircuit and short-circuit power semiconductor fault. Their operation in normal and fault-tolerant modes for the 8/SRM is presented in detail. To verify the capability and operation modes of the proposed system several simulation tests will be presented.
- Using power electronics and automation to simulate solar PV systemsPublication . Fonte, Pedro M.; Cordeiro, Armando; Barata, Filipe; Pires, V. Fernão; Chaves, Miguel; Foito, Daniel; Gamboa, PauloThis paper presents a solar photovoltaic panel simulator system with the ability to perform automatic tests in different condition according to manufacture parameters. This simulator is based on three buck--boost DC -DC converters controlled by a microcontroller and supported by a AXC 1050 Programmable Logic Controller from Phoenix Contact which is responsible for running the automatic tests. This solution allows to understand the typical operation of solar photovoltaic panels and MPPT algorithms considering suddenly changes in the irradiation, temperature, or load.
- Control of PV distributed systems based on three-phase triple inverters to support grids with unbalanced loadsPublication . 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 three-phase triple inverter can support is the injection of unbalanced currents in order to eliminate or attenuate grid load unbalances. Therefore, the proposed topology will be extended to accommodate four wires. The capability of the system to support the grid with ancillary services, especially the compensation of unbalanced loads, the four-wire multilevel topology operation and the proposed controller will be verified through several simulation tests.
- Electric vehicle integrated battery charger for an AC drive with open windingsPublication . Fernão Pires, V.; Cordeiro, Armando; Foito, Daniel; Silva, J. F.Merging of electric vehicle (EV) charging converter within the EV motor drive allows to minimize the charging system regarding volume, weight, and cost. Thus, several integrated battery charger topologies have been presented for well known drives. However, very few works have been addressed for open windings motor drives. This work is focused on open windings motor drives and battery charger types, proposing a new integrated charger topology. The proposed solution avoids the extra three-phase power factor corrector (PFC) and provides bidirectional power flow, allowing the vehicle batteries to operate also as a grid storage system. Some terminals of the motor open windings are connected to a three-phase inverter supplied by the batteries while the remaining terminals are connected to a three-phase inverter with a floating capacitor. The proposed EV battery charger will be verified and tested by several simulation results.