Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 25 for “"Bidirectional power flow"”.
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A High-Efficiency Grid-Tie Battery Energy Storage System
… management system (BMS), a high-efficiency bidirectional ac-dc converter and the central control unit which controls the operation mode and grid interface of the energy storage system. The BMS estimates the state of charge (SOC) and state of health (SOH) of each battery cell in the pack and …
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Constant-frequency resonant power processors
Two constant-frequency resonant power processors are discussed. The parallel resonant converter(PRC) with a controlled output rectifier can provide both forward and reverse power flow. A new control parameter — "θ-angle" is proposed for achieving output regulation and bidirectional power flow of …
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Investigation of Modular CLLC DC/DC Converter using Bypass Control for Wide Output Voltage Regulation
With the recent emerging demands in power electronics and electric grid of the future, resonant converters like CLLC converter are gaining popularity in applications like dc microgrids because of their advantages like high efficiency and bidirectional operation capability. However, one limitation …
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Optimal Volt/VAR Control and Power Dispatch in Active Distribution Systems
… has resulted in transforming unidirectional power flow in passive distribution systems, into bidirectional power flow in active distribution systems. Therefore, many challenges have raised from the intermittent nature of a distribution system with high penetration of microgrids (MGs) and …
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A Framework for Interoperability on the United States Electric Grid Infrastructure
… (US) electric grid has been a stable one-way power delivery infrastructure that supplies centrally-generated electricity to its predictably consuming demand. However, the US electric grid is now undergoing a huge transformation from a simple and static system to a complex and dynamic network, …
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Modeling and Analysis of a Dc Power Distribution System in 21st Century Airlifters
A DC power distribution system (PDS) of a transport aircraft was modeled and analyzed using MATLAB/Simulink software. The multi-level modeling concept was used as a modeling approach, which assumes modeling subsystem of the PDS at three different levels of complexity. The subsystem models were …
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Modeling and Design of a SiC Zero Common-Mode Voltage Three-Level DC/DC Converter
… in excess of 99% with the ability to provide bidirectional power flow between the UPS and battery backup. The converter was verified to operate at the rated UPS conditions of 20 kW while converting between a total DC bus voltage of 800 V and a nominal battery voltage of 540 V.
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Digital geometric-sequence control technique for bidirectional dual active bridge DC-DC converters used in future electric vehicles
Bidirectional DC-DC converters are widely used in different applications such as energy storage systems, Electric Vehicles (EVs), UPS, etc. In particular, future EVs require bidirectional power flow in order to integrate energy storage units into smart grids. These bidirectional power converters …
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Design, Modeling and Analysis of an AC-AC Dual Active Bridge Converter
… to conventional iron-core transformers in the power electronic community. The power industry's increasing demands for smaller size, higher efficiency, and greater energy density have made the SST an attractive option. Among various power electronic converter topologies, the Dual Active Bridge …
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Development of a System for Testing Grid-connected Doubly Fed Induction Generators with Implementation of a Three-level Neutral-Point-clamped Converter
… Furthermore amongst existing wind turbine power generation technologies, the doubly fed induction generator (DFIG) has been distinctively popular for its lower capital costs especially in higher power applications. In order to study the integration of this type of generator into the grid, a …
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Assessment Of Overcurrent Relay Coordination In A Microgrid With High PV Penetration Deployment
… have to be addressed. Deployment of microgrids powered by inverter based distributed generators such as grid-tied photovoltaics poses a threat to maintaining the security and dependability of the distribution network. Protective device coordination is considered as a critical challenge for a …
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DC/DC converter for offshore DC collection network
… turbines and onward transmission to the onshore power network. High wind farm capacity combined with a move to larger wind turbines will result in a large geographical footprint requiring a substantial sub-sea power network to provide internal interconnection. While advanced HVDC transmission has …
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Distributed Energy Storage Systems: Microgrid Application, Market-Based Optimal Operation and Harmonic Analysis
… energy storage systems because of their bidirectional power flow capability. This dissertation focuses on three different aspects of distributed energy storage system applications in distribution networks. It starts with flywheel energy storage system modeling and analysis for application …
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Single-Stage Grid-Connected Multilevel Converters: Topologies and Control Strategies
… supplies is one of the major drivers in the power electronics industry. In this work, the main challenges and objectives for multilevel power converters in grid-connected applications have been elaborated. To address the identified requirements and challenges, a family of efficient multilevel …
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Experimental Evaluation of Medium-Voltage Cascode Gallium Nitride (GaN) Devices for Bidirectional DC–DC Converters
… significant role in ensuring uninterrupted power supply and in supporting the reliability and stability of microgrid operations. Power electronics, especially bidirectional DC–DC converters, are essential parts in distributed energy storage and alternative energy systems because of their …
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Electricity distribution networks’ analysis with particular references to distributed generation and protection
Electric power systems have served well the consumers need for continuous, uninterrupted power supply of good quality and at the minimum possible cost. However, nowadays, the worldwide increasing demand on electric power, coupled with governmental policy changes towards “green” energy and emissions …
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Modern Adaptive Protection and Control Techniques for Enhancing Distribution Grid Resiliency
Power distribution systems have underwent a lot of significant changes in the last two decades. Wide-scale integration of Distributed Energy Resources (DERs) have made the distribution grid more resilient to abnormal conditions and severe weather induced outages. These DERs enhance the reliability …
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2-D Coaxial Integration of Medium Voltage Power Electronics Enabled by Field-Driven Design
… adaptable, distributed, and efficient. Increased power demand from electrified transportation and multi-MW datacenters, in combination with higher generation volatility due to distributed energy resources continue to strain the electrical grid both domestically and abroad. Power electronics …
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Design and analysis of current stress minimalisation controllers in multi-active bridge DC-DC converters.
… have attracted significant research attention in power conversion applications within DC microgrids, medium voltage DC and high voltage DC transmission systems. This is encouraged by MAB's several functionalities such as DC voltage stepping/matching, bidirectional power flow regulation and DC …
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