188 research outputs found
Planning and Control of Expandable Multi-Terminal VSC-HVDC Transmission Systems
No full textThis paper summarizes the research work carried out by Roni Irnawan in his Ph.D. Thesis titled “Planning and Control of Expandable Multi-Terminal VSC-HVDC Transmission Systems”, at the Department of Energy Technology, Aalborg University. The thesis discusses the expansion plan of an existing point-to-point (PtP) link. The main topics discussed in the thesis are: 1) the changes in the steady-state DC voltage operating range of a PtP link when this link is expanded; 2) the impact of the new dc voltage range on the operation of the system; 3) the DC grid control concept that allows expansion of the system; 4) the interoperability between various vendors; 5) a generalized converter control; 6) external adjustment of the converter control response; 7) integration of auxiliary control functions.</p
BUKTI SEBAGAI KORESPONDING AUTHOR PADA JURNAL 2 OK-Roni Pazla
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Rewriting our comments and revisiting revision practices: new concepts for sustainable instruction in the writing classroom
No full textThe driving instructional tool in the majority of writing classrooms, comments, is failing students and instructors because comments are a tool, and not a technique. The utility of comments within the writing classroom is only as strong as its pairing with other instructional techniques. Using comments to teach comments is a flawed method of instruction, and if instructors want to properly use comments within their classes, they must first show their students how to use these techniques in improving their writing. Thus far, the focus of facilitating student revision and student growth within writing classrooms has been on the study of specific comments written by instructors on student papers. The study of such comments reveals the differences in styles, modes, and voices projected from those instructors, but it does reveal much about the intended goal of such comments, the advancement of student writing. Looking back on previous research and incorporating a multifaceted approach to revision helps to build sustainable writing instruction. A review of literature of comments suggests placing students in the center of the classroom by enabling students to take control over the revisions of their own work. This process cannot be done without teaching students how to do things with comments and how to use comments to their advantage. Starting from Joseph Harris’ Rewriting, the same steps toward revision which Harris suggests of students should be copied and applied to the way in which instructors facilitate such revision within the classroom. The improvement of student writing requires several steps which target particular issues with the status quo of commenting, and the use of Harris’ text will enable us to identify the steps. Incorporating revision into the classroom, inviting students into conversation about their text, and opening the lines of communication can help improve revision practices in writing classrooms. Through incorporating a new mastery model within the writing classroom, a technique that begins to show students how comments are made and what to do with them, students can begin to internalize the many processes which they can apply to any writing. The teacher’s goal is to help the student internalize the concepts and apply without the direct instruction of the teacher; however, many writing classrooms have lost this focus. If teachers refocus the classroom on the process of writing and even the process of editing and revising, students will become not just stronger students but writers. Adjustments in the writing classroom cannot occur overnight, but incorporating revision techniques into the course will eventually pay off as students learn to revise their work. These techniques, although not new, can prepare students for writing outside the composition classroom.M. A.Includes bibliographical referencesby Roni L. Bie
Dialettica della durata e vita intima. Attualità di Bergson tra accelerazione del tempo e alienazione sociale
No full textIn this paper the Author focuses on the legacy of dialectics through Bergson’s considerations about time and language, recalling two great interpreters of his philosophy: Giuseppe Prezzolini and Gaston Bachelard. If for the former the «philosophy of contingency» enhances the transformation of social reality, preserving, in consonance with Victor Egger’s
book La parole intérieure, the freedom of inner language, the latter proposes a break of the Bergsonian temporal continuity by opting for a plural and discontinuous duration. Thanks to these readings, it is possible to discover the temporal dialectic which regulates contemporary societies, that is, the acceleration of time and the contraction of memory, in order to develop a more humane way of living time and, consequently, to decline the problem of intersubjectivity in an intercultural perspective
Power Oscillation Damping Using Expandable VSC-HVDC Transmission System
No full textThis thesis refers to the expansion of the COBRAcable by adding an offshore wind farm converter into the existing point--to--point HVDC link, as envisioned by Cigre. The focus is placed on the examination of the influence of the added terminal into the existing power oscillation damping control function and the tuning of the latter for the expanded three--terminal system. Initially, a simple two--area AC system modelled in DIgSILENT PowerFactory is utilized in order to excite inter--area oscillations in it. The HVDC system is modelled as a half-bridge modular multilevel converter based voltage-sourced converter system. The POD control function is added on top of the converters' main control configuration and the HVDC link is connected to the AC system. The latter is subjected to a disturbance and the POD performance is assessed. Subsequently, the additional offshore terminal is added to the existing PtP configuration with the onshore converters operating under two different control modes, i.e. master--slave and DC voltage droop control mode and its influence into the POD function is examined by varying the output power profiles of the wind farm. Finally, the output of the POD controller is compensated with the aim of improving the damping performance when the converters operate in DC voltage droop control mode
Sensitivity Analysis of MTDC Control System
No full textThe North Sea Offshore grid idea has been evaluated as one of a key structures, necessary to ensure the stability of supply in countries of European Union and reduce the energy imported from outside EU. The HVDC connection COBRAcable, which will connect Denmark with Netherlands is supposed to became a Multi terminal DC connection in the future. Since currently there are only few operating VSC MTDC connections in the world and none of them located in Europe, the studies regarding MTDC connections are necessary. Since there are few possible control strategies which may be implemented into the MTDC terminals, it is crucial to determine which one is the most reliable in terms of robustness and operability. This project focus is to find this strategy, based on several test and observation of system behaviour. The model and analyses were created and performed in DIgSILENT Power Factory
Leon Garfield
No full textThrough his historical novels, adventure stories, ghost stories, satires, fairy tales, and retellings of myths and legends, Leon Garfield consistently portrays the mystery of human identity, which he describes as "the only mystery one can unravel endlessly." In this first book-length study of the author of Smith (1967), The Apprentices (1976), John Diamond (1981), and The December Rose (1986), Roni Natov engagingly chronicles the career of a natural storyteller, a man whose work is permeated with the theme of spiritual renewal
Fault detection in HVDC-Connected Wind Farm with Full-Scale Converter Generator (FCG) Wind Turbines
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