Wyniki wyszukiwania - Biblioteka Nauki

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Multi-region fuzzy logic controller with local PID controllers for U-tube steam generator in nuclear power plant

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Puchalski B. , Duzinkiewicz K. , Rutkowski T.

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tom Vol. 25, no. 4

429--444

EN

In the paper, analysis of multi-region fuzzy logic controller with local PID controllers for steam generator of pressurized water reactor (PWR) working in wide range of thermal power changes is presented. The U-tube steam generator has a nonlinear dynamics depending on thermal power transferred from coolant of the primary loop of the PWR plant. Control of water level in the steam generator conducted by a traditional PID controller which is designed for nominal power level of the nuclear reactor operates insufficiently well in wide range of operational conditions, especially at the low thermal power level. Thus the steam generator is often controlled manually by operators. Incorrect water level in the steam generator may lead to accidental shutdown of the nuclear reactor and consequently financial losses. In the paper a comparison of proposed multi region fuzzy logic controller and traditional PID controllers designed only for nominal condition is presented. The gains of the local PID controllers have been derived by solving appropriate optimization tasks with the cost function in a form of integrated squared error (ISE) criterion. In both cases, a model of steam generator which is readily available in literature was used for control algorithms synthesis purposes. The proposed multi-region fuzzy logic controller and traditional PID controller were subjected to broad-based simulation tests in rapid prototyping software - Matlab/Simulink. These tests proved the advantage of multi-region fuzzy logic controller with local PID controllers over its traditional counterpart.

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Analiza sterowania ułamkowego PIλDμ mocą reaktora jądrowego

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Puchalski B. , Duzinkiewicz K. , Rutkowski T.

Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska

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2013

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tom nr 4

63--68

PL

W artykule przedstawiono syntezę regulatora PIλDμ niecałkowitego rzędu dla potrzeb sterowania mocą reaktora jądrowego lekko wodnego określanego, jako typu PWR (Pressurized Water Reactor). W tym celu wykorzystano nieliniowy model matematyczny reaktora PWR o parametrach skupionych obejmujący procesy generacji i wymiany ciepła oraz termicznych efektów reaktywnościowych. Nastawy regulatora PIλDμ niecałkowitego rzędu dobrano w sposób optymalny, minimalizując klasyczne całkowe wskaźniki jakości określane na bazie odpowiedzi skokowej. Na przykładzie najpierw układu oscylacyjnego drugiego rzędu, a potem na przykładzie liniowego modelu reaktora PWR otrzymanego z linearyzacji modelu nieliniowego w określonym punkcie pracy wykazano, że proponowany ułamkowy regulator PIλDμ może stać się alternatywą dla powszechnie stosowanego klasycznego regulatora PID.

EN

In this paper, the synthesis of fractional–order PIλDμ power controller for the PWR (Pressurized Water Reactor) nuclear reactor is presented. For this purpose the point kinetics and heat transfer nonlinear model of the PWR nuclear reactor with thermal feedback mechanisms from lumped fuel and coolant temperature was used. The parameters of the fractional-order PIλDμ controller were tuned due to optimization of the standard integral performance indexes determined on the basis of the step response. Firstly – the typical second order oscillatory dynamic system and secondly – the linear PWR nuclear reactor model derived from nonlinear model was used to show that the fractional order PIλDμ controller may become a alternative to standard PID controller.

3

Siderophore activity in Rhizobium species isolated from different legumes

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Derylo M. , Choma A. , Puchalski B. , Suchanek W.

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1994

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tom 41

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nr 1

EN

Rhizobium strains isolated from nodules of the different legumes including wild-growing plants were examined for their siderophore activity. Fifteen of the 84 screened rhizobial strains were able to grow under conditions of limited iron supply. Nine of them gave orange halos in the assay with Chrom azurol S. Among these strains were Rhizobium sp. (Ononis) and Rhizobium (Genista), producing hydroxamates and phenolates. These compounds could promote the growth of siderophore-negative bacteria on iron-deficient media. The results imply that the hydroxamates from G1 and Ol strains may belong to the monohydroxamate class of siderophores.