http://www.cnr.it/ontology/cnr/individuo/prodotto/ID25793

The control system of the ITER vertical stabilization converter (Articolo in rivista)

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The control system of the ITER vertical stabilization converter (Articolo in rivista) (literal)

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E. Gaio 1, R. Piovan 1, V. Toigo 1, I. Benfatto 5 (2003)
The control system of the ITER vertical stabilization converter
in Fusion engineering and design
(literal)

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In the framework of the international research activities regarding controlled thermonuclear fusion, RFX researchers have been collaborating to the ITER project for many years. When ITER will be realized, it will represent the widest existing international research collaboration, involving European Union, Japan, Russia, China, South Corea and United States among others. This paper is a typical example of RFX collaboration to ITER, regarding in particular the design and the optimization of the power supply system of the machine. RFX power supply experts provided many original contributions to the ITER design; in some case their activity has been awarded in international conferences dealing with fusion technology. This paper has been published in Fusion Engineering and Design, which is the most important journal as far as fusion technology area is concerned. (literal)

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Rivista

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Università di Padova, CNR ed ENEA hanno costituito il Consorzio RFX per realizzare congiuntamente attività di ricerca sulla fusione nucleare controllata. Il personale resta dipendente dal proprio ente, precisato nel campo (literal)

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The paper describes the control system of the International Thermonuclear Experimental Reactor (ITER) Vertical Stabilization converter, which has been optimized to achieve the best performance in terms of response time. The VS converter is rated for 8 kV no load output voltage and 22.5 kA maximum output current; it is based on two identical basic units connected in series, each made of two identical subunits connected in parallel. The converter four quadrant operation is first described, and the undesired current unbalance between the converter subunits, due to fast voltage transients, is discussed; then the design criteria and the regulator structure to avoid current unbalances are described. Finally, the simulation results of the complete circuit operation in the worst conditions are reported to evaluate the converter performances. The results show that also in these conditions the specified performances are satisfied, while in a wider operating region the dynamic behavior is much better than requested. Current unbalances are avoided during the inversion phase; it is also pointed out that transients in the system can be controlled without chokes, which therefore can be avoided reducing the system cost. (literal)

Note

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1 CNR, 2 UniPD, 3 ENEA, 4 Consorzio RFX (dipendenti), (i dipendenti di 1-2-3 sono anche affiliati al Consorzio RFX) 5 EFDA CSU-Euratom (literal)

Titolo

Abstract

The paper describes the control system of the International Thermonuclear Experimental Reactor (ITER) Vertical Stabilization converter, which has been optimized to achieve the best performance in terms of response time. The VS converter is rated for 8 kV no load output voltage and 22.5 kA maximum output current; it is based on two identical basic units connected in series, each made of two identical subunits connected in parallel. The converter four quadrant operation is first described, and the undesired current unbalance between the converter subunits, due to fast voltage transients, is discussed; then the design criteria and the regulator structure to avoid current unbalances are described. Finally, the simulation results of the complete circuit operation in the worst conditions are reported to evaluate the converter performances. The results show that also in these conditions the specified performances are satisfied, while in a wider operating region the dynamic behavior is much better than requested. Current unbalances are avoided during the inversion phase; it is also pointed out that transients in the system can be controlled without chokes, which therefore can be avoided reducing the system cost. (literal)

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