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 244 for “"inverters"”.
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Dynamic Aggregation of Grid-tied Inverters
Power-electronics inverters are being integrated in large numbers in distribution networks with rapid deployment of renewable resources, energy storage, and flexible loads. Since such distributed energy resources will serve a majority of loads in the next- generation power network, it is critical …
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Multilevel inverters for renewable energy systems
Voltage source inverters have become widely used in the last decade primarily due to the fact that the dangers and limitations of relying on fossil fuel based power generation have been seen and the long term effects felt especially with regards to climate change. Policies and targets have been …
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Innovative Control Algorithms for Grid-Tied Inverters
L'abstract è presente nell'allegato / the abstract is in the attachment
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Advanced control techniques for modern inertia based inverters
… proposed to make the behavior of grid connected inverters more similar to the synchronous generators, by mimicking the mechanical behavior of a synchronous generator. Conventional control techniques lack to perform optimally in nonlinear, uncertain, inaccurate power grids. Besides, the decoupled …
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High Power and High Frequency Class-DE Inverters
This thesis investigates the various aspects of the theory. design and construction of a Class-DE type inverter and how these affect the power and frequency limits over which a Class-DE inverter can feasibly be used to produce AC (or RF) power. To this extent. an analysis of Class-DE operation in a …
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Parameter estimation of induction motors using PWM inverters
Induction motor parameter identification algorithms utilizing the DSP controlled 3 phase PWM inverter constructed in [12] are discussed. A single stator voltage test is carried out with the machine's rotor standing still. The resulting transient is used to determine machine electrical parameters. …
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Voltage Regulation for Distribution Networks with Smart Photovoltaic Inverters
… to the distribution networks. The PV inverters which are able to provide fast and flexible reactive power compensation are thus encouraged to participate in the voltage regulation. Particularly, the smart PV inverters with sensing, communicating and computing capabilities are able to …
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The Application of Microprocessors to Pulse-Width-Modulated Inverters
The introduction gives consideration to the aspects of communication principles, power converters, PWM modulation techniques and the application of LSI intergrated circuits as regards their effect on the design of variable speed AC drives. <br/><br/>Chapter 1 includes background material where …
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Investigations of New Fault-Tolerant Methods for Multilevel Inverters
… new power electronics generations. Multilevel inverters (MLI) are one of the most promising power electronics circuits that have been implemented and commercialized in high-voltage direct current (HVDC), motor drives, and battery energy storage systems (BESS). The expanding uses of the MLI have …
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Smart inverters for seamless voltage and frequency dynamics in microgrids
… are presented to turn the conventional inverters implemented in distributed generation (DG) units into smart inverters capable of dealing with disturbances. In the context of microgrids, the smartness of an inverter is tied to its ability to cope with abnormalities such as sudden load …
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The application of communication principles to pulse-width modulated inverters
… be usefully applied to pulse-width modulated inverters to increase their useable frequency range, without increasing the switching frequency of the power devices.<br/><br/>The prior-art techniques of reducing harmonic distortion in pulse-width-modulated inverters is investigated, and it is …
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New Modulation Method and Control Strategies for Power Electronics Inverters
The DC to AC power Converters (so-called Inverters) are widely used in industrial applications. The MLIs are becoming increasingly popular in industrial apparatus aimed at medium to high power conversion applications. In comparison to the conventional inverters, they feature superior …
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Observer-based fault detection and isolation for motor drive inverters
Abstract Observer-based methods can be used for fault detection and isolation for switched linear systems. A state observer is constructed based on the physical system. Changes in the observer error are monitored to detect specific types of faults. This thesis uses the mathematical basis to offer a …
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Design of LCL-filters for grid-connected voltage source inverters
… L-filters for grid-connected voltage source inverters (VSI) due to their superior harmonic attenuation, smaller filter size and weight. The LCL-filter design process is complex and takes an iterative approach due to the coherence between the filter parameters and design requirements. The main …
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SiC-Based High-Frequency Soft-Switching Three-Phase Rectifiers/Inverters
Three-phase rectifiers/inverters are widely used in grid-tied applications. Take the electric vehicle (EV) charging systems as an example. Within a certain space designated for the chargers, quick charging yet high efficiency are demanded. According to the current industry practice, with a power …
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Cascade Dual-Buck Inverters for Renewable Energy and Distributed Generation
… matter what renewable energy source is utilized, inverters are essential in the microgrid system. Thanks to flexible modular design, transformerless connection, extended voltage and power output, less maintenance and higher fault tolerance, the cascade inverters are good candidates for utility …
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Control Strategies for High Power Four-Leg Voltage Source Inverters
In recent decades there has been a rapidly growing demand for high quality, uninterrupted power. In light of this fact, this study has addressed some of the causes of poor power quality and control strategies to ensure a high performance level in inverter-fed power systems. In particular, specific …
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Comparison Between PWM and SVPWM Three-Phase Inverters in Industrial Applications
<p>Two different three-phase inverters are introduced and compared showing the differences and similarities between them in terms of output power, implementation, challenges and efficiency. Both inverters use the same feedback controller and both have the same input voltage and the same load …
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Power electronics solutions for uninterrupted power supply and grid-tie inverters
… conversion with higher efficiency. Delta Microinverters innovation is found in its patent-pending shape and in its patent-pending circuitry, i.e., electronics mounted inside of the Delta Microinverter. The Delta Microinverters shape has a housing configured for rapid mounting using a single …
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Design of Hybrid Inverters Using Wideband Gap Semiconductors for Microgrid Application
… power, the need for high efficiency high power inverters connected to homes is more relevant than ever. Connecting these renewable energy sources (RES) coupled with an energy storage system (ESS) to the grid through a hybrid inverter, with the highest efficiency and grid stability, is quickly …
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