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 14 of 14 for “"Uninterruptible Power Supply"”.
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DSP controlled three phase to single phase uninterruptible power supply
… number of single phase loads onto a three phase supply, such as in a large computer network. This has resulted in more frequent supply voltage failure, causing substantial data and financial loss and in the extreme case death due to hospital equipment not being powered. Thus the need for an …
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High frequency switching parallel processing topology for AC uninterruptible power supply
… of a high frequency parallel processing ac uninterruptible power supply. Compared to the standard UPS system used today, the proposed system has higher efficiency, smaller size and less weight, this is due primary to the usage of a high-frequency switching topology. The main power circuit …
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DSP phase angle controlled three phase to single phase uninterruptible power supply
Includes bibliographical references.
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PC based simulation software package for an uninterruptable power supply
The uninterruptible power supply (hereafter referred to as UPS) has become an integral part of modern computer and communication systems. Various topologies have come to the fore in recent times with the advent of high frequency switching techniques. This project considers such a high frequency …
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The parallel connection of single phase DC to AC power converters
Electrical power converter subsystems are placed between an ac-mains bus and a load in order to condition the power being transferred, to protect the load and the ac source, and to provide uninterruptible power supply (UPS) features. One method of providing the required interface in, low to medium …
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taking charge : optimizing urban charging infrastructure for shared electric vehicles
… such as battery chemistry, pack design, and power input are presented and evaluated. A strategy for buffering rapid electric vehicle charging with commercial uninterruptible power supply (UPS) systems is described. Two recent buildings on the MIT campus are used as case studies to demonstrate …
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A Novel Auxiliary Resonant Snubber Inverter Using Wide Bandgap Devices
In the application of power inverters, power density has become a key design specification where it has stringent requirements on system size and weight. Achieving high power density need to combine lasted wide bandgap (WBG) device technology and high switching frequency to reduce passive filter …
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Resonant UPS topologies for the emerging hybrid fiber coaxial networks
Uninterruptible power supply (UPS) systems have been extensively applied to feed critical loads in many areas. Typical examples of critical loads include life-support equipment, computers and telecommunication systems. Although all UPS systems have a common purpose to provide continuous power-to …
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Impact of System Impedance on Harmonics Produced by Variable Frequency Drives (VFDs)
… loads that inject harmonic currents into the power system, and result in harmonic voltages across the system impedance. This harmonic distortion can negatively impact the performance of other sensitive loads in the system. If a VFD serves a critical function, it may be necessary to supply the …
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Economic Analysis of a Data Center Virtual Power Plant Participating in Demand Response
… response (DR) to benefit both the electric power system and the data center. Therefore, data center energy resources, including renewable energy, are aggregated and controlled using an energy management system (EMS) to operate as a virtual power plant (VPP). The data center as a VPP …
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Optimal and resilient management of distributed energy resources
… problems ranging from greenhouse gas emissions, power grid resilience and reliability to developing low-cost and uninterruptible power supply for mission critical systems. It is envisioned that fossil fuel-based centralized power generation will gradually be replaced with renewable distributed …
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Superconducting magnetic energy storage for power system stability and quality enhancement
The stability of power systems has become the most critical issue affecting their quality and performance. Concerns over climate change are now moving the energy sector into a new era of modern power grids. To sustain the reliable operation of power systems and improve the quality of power …
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The impact of information and communication technologies (ICT) infrastructure on remote work service delivery for Administrators in South African SMEs
… SMEs to prioritise investing in adequate power backup resources, such as solar power and uninterruptible power supply (UPS), so to address the connectivity challenge that the Administrators encounter, while working remotely. In addition, for future studies, the researcher suggests a mixed …
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Circuits and Modulation Schemes to Achieve High Power-Density in SiC Grid-connected Converters
… has been a 'game changer' in the field of power electronics. With desirable material properties such as low-loss characteristics, high blocking voltage, and high junction temperature operation, they are expected to drastically increase the power density of power electronics systems. Recent …