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Discrete time sliding mode control strategies applied to a multiphase brushless DC machine
Nowadays, environmental issues motivates the replacement of mechanical, hydraulic and pneumatic system by electrical system in the transport sector aiming to reduce emissions generated by burning of fossil fuels in vehicles. The electrical system must ensure high electrical efficiency and should not exceed the weight of the substituted components. To attend these high performance requirements a fault-tolerant multiphase brushless DC machine was chosen for this research. The present work introduces a six-phase 600W brushless DC machine with 8 poles. The main challenge for the control issues of this machine is the mutual magnetic coupling between the phases due to the wave winding machine configuration. In this context, theoretical and practical investigations of different current control strategies based on the sliding mode control approach applied to the six-phase brushless DC machine are presented.
Investigation of Reliability Aspects of Power Semiconductors in Photovoltaic Central Inverters for Sunbelt Regions
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.
Maximierung der Leistungsdichte von selbstgeführten hochfrequenten Energiewandlern auf Basis ultraschneller Wide-Bandgap Bauelemente
Um Kosten zu reduzieren und marktfähig bleiben zu können, geht auch in der Anwendung von selbstgeführten Energiewandlern der Trend hin zur Miniaturisierung. Vor allem kleinere Gehäuse und Kühlkörper sowie kleinere Drosseln und Filterelemente können den Materialeinsatz erheblich reduzieren und die Kosten senken. Dies führt dazu, dass bei gleichbleibender Performance die Leistungsdichte des gesamten Produktes maximiert werden muss. Durch den Einsatz von effektiveren Bauelementen kann dies erreicht werden. Zudem können beispielsweise durch höherer Taktfrequenzen Drosseln und Filterelemente kleiner dimensioniert werden.
Die aktuelle Aufbau- und Verbindungstechnik (AVT) stößt bei der Lösung dieser Herausforderungen jedoch an ihre Grenzen, weswegen neue Ansätze erforderlich sind. Ein neuer Ansatz in der Leistungselektronik ist die Einbettung von Bauelementen in die Leiterplatte. Im Rahmen dieser Arbeit wurde diese Technologie mit neuen Siliziumcarbid Leistungshalbleiterschaltern untersucht und mit der konventionellen diskreten AVT verglichen. Zudem wurden die Einflüsse ultraschneller Schaltvorgänge sowie von parasitären Elementen auf die Peripherie untersucht.
Self Portrait in Green
'NDiaye is a hypnotic storyteller with an unflinching understanding of the rock-bottom reality of most people's life.' New York Times ' One of France's most exciting prose stylists.' The Guardian. Obsessed by her encounters with the mysterious green women, and haunted by the Garonne River, a nameless narrator seeks them out in La Roele, Paris, Marseille, and Ouagadougou. Each encounter reveals different aspects of the women; real or imagined, dead or alive, seductive or suicidal, driving the narrator deeper into her obsession, in this unsettling exploration of identity, memory and paranoia. Self Portrait in Green is the multi-prize winning, Marie NDiaye's brilliant subversion of the memoir. Written in diary entries, with lyrical prose and dreamlike imagery, we start with and return to the river, which mirrors the narrative by posing more questions than it answers.
High As the Waters Rise
This "gorgeously written" National Book Award finalist is a dazzling, heart-rending story of an oil rig worker whose closest friend goes missing, plunging him into isolation and forcing him to confront his past (NPR, One of the Best Books of the Year). One night aboard an oil drilling platform in the Atlantic, Waclaw returns to his cabin to find that his bunkmate and companion, Mátyás, has gone missing. A search of the rig confirms his fear that Mátyás has fallen into the sea. Grief-stricken, he embarks on an epic emotional and physical journey that takes him to Morocco, to Budapest and Mátyás's hometown in Hungary, to Malta, Italy, and finally to the mining town of his childhood in Ge...
About Trees
About Trees considers our relationship with language, landscape, perception, and memory in the Anthropocene. The book includes texts and artwork by a stellar line up of contributors including Jorge Luis Borges, Andrea Bowers, Ursula K. Le Guin, Ada Lovelace and dozens of others. Holten was artist in residence at Buro BDP. While working on the book she created an alphabet and used it to make a new typeface called Trees. She also made a series of limited edition offset prints based on her Tree Drawings.
The Mosquito Bite Author
Originally published in 2011, The Mosquito Bite Author is the seventh novel by the acclaimed Turkish author Barış Bıçakçı. It follows the daily life of an aspiring novelist, Cemil, in the months after he submits his manuscript to a publisher in Istanbul. Living in an unremarkable apartment complex in the outskirts of Ankara, Cemil spends his days going on walks, cooking for his wife, repairing leaks in his neighbor’s bathroom, and having elaborate imaginary conversations in his head with his potential editor about the meaning of life and art. Uncertain of whether his manuscript will be accepted, Cemil wavers between thoughtful meditations on the origin of the universe and the trajectory of political literature in Turkey, panic over his own worth as a writer, and incredulity toward the objects that make up his quiet world in the Ankara suburbs.
Killing the Water
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Moon Brow
"Before he enlisted as a soldier in the Iran-Iraq war and disappeared, Amir Yamini was a carefree playboy whose only concerns were seducing women and riling his religious family. Five years later, his mother and sister Reyhaneh find him in a mental hospital for shell-shocked soldiers, his left arm and most of his memory lost. Amir is haunted by the vision of a mysterious woman whose face he cannot see-- the crescent moon on her forehead shines too brightly. He names her Moon Brow. Back home in Tehran, the prodigal son is both hailed as a living martyr to the cause of Ayatollah Khomeini's Revolution and confined as a dangerous madman. His sense of humor, if not his sanity, intact, Amir cajoles Reyhaneh into helping him escape the garden walls to search for Moon Brow. Piecing together the puzzle of his past, Amir decides theres only one solution: he must return to the battlefield and find the remains of his severed arm-- and discover its secrets"--Amazon.com.
The Italian
An emblematic story of the shipwreck of the Arab Spring At his father's funeral, to the great consternation of all present, Abdel Nasser beats the imam who is celebrating the funeral rite. The narrator, a childhood friend of the protagonist, retraces the story of "the Italian" from his days as a free and rebellious adolescent spirit to the leader of a student movement and then affirmed journalist. Those were crucial years in Tunisia, years of great tension, change, and repression. Against this background full of revolutionary ferments stands the tormented love story between Abdel Nasser and Zeina, a brilliant and beautiful philosophy student. Their dreams will unfortunately end up being wrecked under the ruthless gears of a corrupt and chauvinist society. Abdel Nasser's transformation from a young idealist with high hopes to a successful, but disillusioned and tired journalist is masterfully narrated in a stream of stories, digressions and flashbacks in which the narrative tension is always high. Winner of the 2015 International Prize for Arabic Fiction
