1,721,041 research outputs found
270V/28V wide bandgap device-based DAB converter for more-electric-aircrafts: Feasibility and optimization
No full textWide bandgap power devices represent a new frontier for More-Electric-Aircraft (MEA) since they can operate with high junction temperature and with reduced switching losses at high switching frequencies. It allows reduction of the cooling system size and high power density. At present the application of wide bandgap devices to MEA power converters is still limited by their rated current. In this paper a feasibility study of a 270V/28V SiC MOSFET Dual Active Bridge (DAb) converter for MEA is presented. It is based on the analysis of SiC power devices currently available on the market. DAB converter performance optimization is obtained through the use of the Trapezoidal Modulation (TM) instead of the standard Phase Shift Modulation (PSM) and thanks to a proper selection of the power devices. These conclusions are supported by thorough results
AC-DC interface converters for MW-scale MVDC distribution systems: A survey
No full textFocusing on the relevant pros provided by power conversion onboard introduction (e.g. reduction of power system weight/volume), a widespread use of power converters is foreseeable in future MVDC shipboard power systems. For conveniently exploiting the power converters capability in the marine environment, a preliminary investigation about the attainable topologies must be carried out. In this paper the focus is limited to the AC-DC interface power conversion stage. Starting from the analysis of the power devices fully available on the market, four AC-DC interface converters topologies are proposed: a 12-pulse thyristor rectifier, an IGCT based rectifier, a modular multilevel IGBT rectifier and finally an IGBT Dual Active Bridge (DAB) based rectifier. With references to the present standards issues, the survey highlights advantages and disadvantages of the presented topologies providing a preliminary comparison in terms of rough estimation of weights, filtering elements, scalability (both in power and in voltage), power quality performance, galvanic isolation, complexity, etc
Performance comparison of Simplified Feedback Linearization control with classical dual loop control for single-phase grid-connected inverters
No full textIn Distributed Power Generation Systems (DPGS), the control system of the converter, interfacing the electrical source with the main grid, is generally based on a dual loop cascade control structure where the internal loop is in charge of the current control while the outer loop controls the voltage at the DC link. The DC voltage can be subjected to transient conditions due to the change of the power produced by the source. If the system experiences high and abrupt variations of the DC voltage, the control system designed starting from a small signal linearized model can fail. In this paper, a Simplified Feedback Linearization (SFL) control is designed for a single-phase grid-connected converter. The system is compared with a classical dual loop control in terms of stability and dynamics performances. Simulation and experimental results confirms the effectiveness of the SFL control also in case of high variations of the DC voltage reference
Power-Electronics-Based Power Distribution System of a MVDC Ship: AC/DC Interface Converters and Control System
No full textNext generation of MVDC ships will be characterized by a power-electronics-based power distribution system. Since onboard power generation is in AC, special attention is pointed at the AC/DC interface converters forming the MVDC bus of the shipboard power distribution system. In this paper preliminary design of two AC/DC power conversion stages and their voltage control is provided. Besides the respective local control systems, a coordination strategy is required between the two AC/DC power conversion stages in order to achieve loads power sharing. In the proposed case study, a MVDC bus control based on the droop control theory is adopted. Simulation results support the proposed coordination strategy
Grid-Connected PV Plants
Full text linkPV power plant integration into the grid has been a relevant topic of interest over the last years. Policies supported by governments, technology maturity, favorable incentives, and cost decreasing have significantly promoted the integration of PV power plants into power systems at the transmission and distribution levels. Nevertheless, some barriers remain in terms of forecasting generation, grid reliability, and power quality, which must be overcome for the massive PV integration into future power systems. Additionally, the ancillary services provided by these generation units are increasingly required by different agents to facilitate grid operation under a high proportion of renewables. Topics of interest for this Special Issue include the following areas: large-scale PV power plants, energy policies related to PV power plants, grid integration and interaction, PV power plant modeling, monitoring and case studies, communication systems for PV power plants integration, economic analyses, PV inverters and sizing analyses, new trends in PV technologies, and reviews
DC Multibus based on a Single-Star Bridge Cells Modular Multilevel Cascade Converter for DC Smart Grids
No full textGrid-Connected PV Plants
No full textPV power plant integration into the grid has been a relevant topic of interest over the last years. Policies supported by governments, technology maturity, favorable incentives, and cost decreasing have significantly promoted the integration of PV power plants into power systems at the transmission and distribution levels. Nevertheless, some barriers remain in terms of forecasting generation, grid reliability, and power quality, which must be overcome for the massive PV integration into future power systems. Additionally, the ancillary services provided by these generation units are increasingly required by different agents to facilitate grid operation under a high proportion of renewables. Topics of interest for this Special Issue include the following areas: large-scale PV power plants, energy policies related to PV power plants, grid integration and interaction, PV power plant modeling, monitoring and case studies, communication systems for PV power plants integration, economic analyses, PV inverters and sizing analyses, new trends in PV technologies, and reviews
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