Development of Brushless Self-excited and Self-regulated Synchronous Generating System for Wind and Hydro Generators
Development of Brushless Self-excited and Self-regulated Synchronous Generating System for Wind and Hydro Generators

Author: Izzat, Likaa Fahmi Ahmed

Publisher: kassel university press GmbH

Published: 2013-01-01

Total Pages: 314

ISBN-13: 3862190188

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In this work, a developed model of brushless synchronous generator of wound rotor type is designed, analyzed by FEM, practically applied and investigated. A comparison of results with conventional machines is also performed. The presented machine can be applied for multi-pole wind/ hydro generators or double-poles diesel-engine generators. It is self-excited by residual magnetism and a connected capacitor. It is also self-regulated by making use of fluctuations at load or limited speed changes. The generated voltage may last at extended speed range by arranging a generating system with variable capacitance. By eliminating the permanent magnets or advanced manufacturing technology of rotor poles; and without using extra rotating/ external DC exciters, an efficient excitation field and an output of flat self-compensated compound characteristic are obtained. More, the feature of damper windings is determined. Concerning the fact of environmental diminishing of elements in materials of permanent magnets and D.C. Battery, the presented novel machine is hence a good alternative and more economic from generators, exist in the market. Beside, it is safer and highly recommended for power stability when connected to the grid.

Design, Control, and Harmonic Compensation for Stand-Alone and Grid-Connected Voltage-Source Converters: Simulation and Experimental Validations
Design, Control, and Harmonic Compensation for Stand-Alone and Grid-Connected Voltage-Source Converters: Simulation and Experimental Validations

Author: Ahmed Ali Nazeri

Publisher: BoD – Books on Demand

Published: 2024-01-01

Total Pages: 366

ISBN-13: 3737611688

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Voltage source converters (VSCs), among other power converters, play a crucial role in supplying power to both local loads and the grid at the PCC. During stand-alone operation, VSCs ensure stable power for loads by regulating the output voltage. In grid-connected mode, the regulation shifts to controlling output current, such as converter side current (CSC) or grid side current (GSC), to inject sinusoidal current into the electrical grid. The nonlinear characteristics of the loads connected to the power converters result in significantly distorted output voltages. This capability is crucial for applications such as uninterruptible power supply (UPS), emphasizing the importance of precise output voltage control. Similarly, in grid-connected mode, the CSC or the GSC is regulated to inject low THD current. The aim is to mitigate grid current harmonics arising from dead time and distorted grid voltages. Therefore, the harmonic mitigation of the grid current control is investigated in this work. This work presents the implementation of the proportional resonant plus multi-resonant (PR-MR) and practical proportional resonant plus multi-resonant (PMR-MR) harmonic controllers in the voltage and current control loops to mitigate the high-order harmonic currents.

Short Circuit Requirements of Power Converters based upon Wide-Bandgap Semiconductors
Short Circuit Requirements of Power Converters based upon Wide-Bandgap Semiconductors

Author: Douglas Pappis

Publisher: BoD – Books on Demand

Published: 2021-01-01

Total Pages: 270

ISBN-13: 3737609772

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In power electronics designs, the evaluation and prediction of potential fault conditions on semiconductors is essential for achieving safe operation and reliability, being short circuit (SC) one of the most probable and destructive failures. Recent improvements on Wide-Bandgap (WBG) semiconductors such as Silicon Carbide (SiC) and Gallium nitrite (GaN) enable power electronic designs with outstanding performance, reshaping the power electronics landscape. In comparison to Silicon (Si), SiC and GaN power semiconductors physically present smaller chip areas, higher maximum internal electric fields, and higher current densities. Such characteristics yield a much faster rise of the devices’ internal temperatures, worsening their SC performance. In this way, this dissertation consists of a comprehensive investigation about SC on SiC MOSFETs, GaN HEMT, and GaN E-HEMT transistors, as well as contextualizing their particularities on SC performance by comparison with that of Si IBGTs. Moreover, an investigation towards how to prevent SC occurrences besides a review of available SC protection methods is presented.

Investigation of Reliability Aspects of Power Semiconductors in Photovoltaic Central Inverters for Sunbelt Regions
Investigation of Reliability Aspects of Power Semiconductors in Photovoltaic Central Inverters for Sunbelt Regions

Author: Christian Felgemacher

Publisher: kassel university press GmbH

Published: 2018-03-23

Total Pages: 186

ISBN-13: 3737604940

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High reliability and system lifetimes in the range of 30 years are essential for renewable energy systems such as photovoltaic power plants to minimise costs for the generated electric energy. At the same time such systems are used in regions with high solar irradiance and also harsh environmental conditions. Therefore, designs for photovoltaic inverters need to meet not only the key design criteria of high conversion efficiency but also need to be very robust and at the same time meet challenging cost targets. In this dissertation aspects concerning the lifetime and reliability of power semiconductors in photovoltaic central inverters are investigated. On key topic of the dissertation is the measurement of the voltage dependent failure rate due to cosmic radiation induced single-event-burnout of SiC and Si power semiconductors. The second topic is the development of a system level simulation to quantify the stress on the power semiconductors in a PV central inverters in various regions of the world. Further topics are the investigation of improved control concepts for the cooling system of PV central inverters and the monitoring of IGBT temperatures during converter operation.

Latest Trends in Renewable Energy Technologies
Latest Trends in Renewable Energy Technologies

Author: Shelly Vadhera

Publisher: Springer Nature

Published: 2021-07-01

Total Pages: 445

ISBN-13: 9811611866

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This book presents select proceedings of the National Conference on Renewable Energy and Sustainable Environment (NCRESE 2020) and examines a range of reliable energy-efficient harvesting technologies, their applications and utilization of available alternate energy resources. The topics covered include alternate energy technologies, smart grid topologies and their relevant issues, solar thermal and bio-energy systems, electric vehicles and energy storage systems and its control issues. The book also discusses various properties and performance attributes of advance renewable energy techniques and impact on environmental sustainability. The book will be useful for researchers and professionals working in the areas of energy and sustainable environment and the allied fields.

Handbook of Research on Emerging Technologies for Electrical Power Planning, Analysis, and Optimization
Handbook of Research on Emerging Technologies for Electrical Power Planning, Analysis, and Optimization

Author: Shandilya, Smita

Publisher: IGI Global

Published: 2016-02-26

Total Pages: 435

ISBN-13: 1466699124

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As the demand for efficient energy sources continues to grow around the globe, electrical systems are becoming more essential in an effort to meet these increased needs. As these systems are being utilized more frequently, it becomes imperative to find ways of optimizing their overall function. The Handbook of Research on Emerging Technologies for Electrical Power Planning, Analysis, and Optimization features emergent methods and research in the systemic and strategic planning of energy usage. Highlighting theoretical perspectives and empirical research, this handbook is a comprehensive reference source for researchers, practitioners, students, and professionals interested in the current advancements and efficient use in power systems.

Sustainability in Energy and Buildings
Sustainability in Energy and Buildings

Author: Nacer M'Sirdi

Publisher: Springer Science & Business Media

Published: 2012-01-15

Total Pages: 640

ISBN-13: 3642275095

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Welcome to the proceedings of the Third International Conference on Sustainability in Energy and Buildings, SEB’11, held in Marseilles in France, organised by the Laboratoire des Sciences del'Information et des Systèmes (LSIS) in Marseille, France in partnership with KES International. SEB'11 formed a welcome opportunity for researchers in subjects related to sustainability, renewable energy technology, and applications in the built environment to mix with other scientists, industrialists and stakeholders in the field. The conference featured presentations on a range of renewable energy and sustainability related topics. In addition the conference explored two innovative themes: the application of intelligent sensing, control, optimisation and modelling techniques to sustainability and the technology of sustainable buildings. These two themes combine synergetically to address issues relating to The Intelligent Building. SEB’11 attracted a significant number of submissions from around the world. These were subjected to a two-stage blind peer-review process. With the objective of producing a high-quality conference, only the best 50 or so of these were selected for presentation at the conference and publication in the proceedings. It is hoped that you will find this volume an interesting, informative and useful resource for your research.