Wyniki wyszukiwania - BazTech

1

Fuzzy logic PID control of a PMDCM speed connected to a 10-kW DC PV array microgrid - case study

Tudoroiu Roxana-Elena, Zaheeruddin Mohammed, Tudoroiu Nicolae, Burdescu Dumitru Dan

Annals of Computer Science and Information Systems

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2019

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Vol. 18

359–-362

EN

The main objective of this paper is focused on the real time implementation in a MATLAB/SIMULINK environment of a closed-loop hybrid control strategy structure consisting of a combination of Fuzzy Logic control approach and a standard PID control strategy. This strategy is applied to control the speed of a 2 HP 1750 rpm permanent magnet DC motor used in a wide range of HVAC applications. The novelty of the paper is the new modeling approach by using SIMULINK SIMSCAPE library blocks, more practical due to its simplicity, easier and faster to implement and, in particular, very easy to practice for MATLAB users compared to a traditional modelling approach. The DC motor can be powered by a unidirectional DC voltage converter connected to a 10 kW-Microgrid PV array or directly from a Li-Ion battery or a Supercapacitor, both connected via two bidirectional DC boost-buck converters to the same Microgrid. The Microgrid energy storage system is suitable for renewable energy applications that are connected to a local grid, thus releasing the overloaded national grid, saving a considerable amount of energy and drastically reducing the energy costs.

2

Planowanie lokalizacji i optymalizacja wydajności instalacji gruntowych pomp ciepła w obiegu zamkniętym za pomocą map geotermicznych. Wyniki projektu TransGeoTherm

Kłonowski M., Kozdrój W.

Technika Poszukiwań Geologicznych

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2016

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R. 55, nr 2

93--103

PL

Artykuł prezentuje wyniki badań projektu TransGeoTherm – Energia geotermalna dla transgranicznego rozwoju regionu Nysy. Projekt pilotażowy, zrealizowanego przez Państwowy Instytut Geologiczny–Państwowy Instytut Badawczy oraz Sächsisches Landesamt für Umwelt, Landwirtschaft und Geologie. Celem projektu było wsparcie wykorzystania płytkiej, niskotemperaturowej energii geotermalnej za pomocą ogólnodostępnych map geotermicznych. Po analizie danych z 5146 otworów geologicznych i hydrogeologicznych oraz danych geofizycznych dla obszaru o powierzchni około 1000 km2 położonego na pograniczu Polski i Saksonii, w rejonie Zgorzelca i Görlitz wykonano geologiczny model podłoża 3D w oprogramowaniu GOCAD® do głębokości około 200 m. W obrębie 75 jednostek wydzielonych na podstawie klasyfikacji litostratygraficznej i właściwości hydrogeologicznych obliczono wartości współczynnika przewodności cieplnej λ. W efekcie opracowano 12 map geotermicznych w cięciach głębokościowych do: 40, 70, 100 i 130 m, ukazujących rozkład przestrzenny średniej wartości współczynnika mocy cieplnej [W/m] i średniej wartości przewodności cieplnej skał λ [W/m∙K], które stanowią pomoc w lokalizacji i optymalizacji wydajności instalacji gruntowych pomp ciepła.

EN

This paper presents the results of the TransGeoTherm – Geothermal Energy for transboundary development of the Nysa Region. Pilot project, implemented by the Polish Geological Institute–National Research Institute and the Saxon State Agency for Environment, Agriculture and Geology for the area of about 1000 km2, within the Polish-Saxon transboundary region nearby Zgorzelec and Görlitz. This aimed at enhancing the use of shallow geothermal energy with the support of publically available geothermal maps. The analysis of geological and hydrogeological data of 5,146 boreholes and geophysical data allowed, for the construction of a 3D geological model up to the depth of about 200 m with help of the GOCAD® software. The values of the thermal conductivity λ were determined for 75 units based on their lithostratigraphic classification and hydrogeological parameters. In effect 12 geothermal maps for the depths up to 40, 70, 100 and 130 meters, showing spatial variation of an average heat extraction rate (thermal power coefficient) [W/m] and an average value of thermal conductivity of the rocks λ [W/m∙K] were produced. Those provide valuable support to place and optimize performance of the ground source heat pumps.

3

Electromechanical system-in-package carbon nanotube VCO

Kauth C., Pastre M., Kayal M.

International Journal of Microelectronics and Computer Science

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2013

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Vol. 4, nr 4

153--158

EN

Encapsulated tunable electromechanical oscillators are a milestone on the road to smart dust sensor nodes. To foster the advent of ultrahigh system sensitivity thanks to novel technologies, a computationally light analytical and semi-empirical model for carbon nanotube resonator dynamics, electromechanical and piezoresistive properties is presented. This model is the breeding ground for the subsequent design and integration of a phase locked loop and feedback circuitry, which form an adaptive closed-loop oscillator for actuation, detection and sustainment of the nanotube’s motion. Closed-loop operation and tube stretching make the system Widely universal and invariant to spreads in nanotube characteristics.

4

Active fault diagnosis based on stochastic tests

Poulsen N. K., Niemann H.

International Journal of Applied Mathematics and Computer Science

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2008

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Vol. 18, no 4

487-496

EN

The focus of this paper is on stochastic change detection applied in connection with active fault diagnosis (AFD). An auxiliary input signal is applied in AFD. This signal injection in the system will in general allow us to obtain a fast change detection/isolation by considering the output or an error output from the system. The classical cumulative sum (CUSUM) test will be modified with respect to the AFD approach applied. The CUSUM method will be altered such that it will be able to detect a change in the signature from the auxiliary input signal in an (error) output signal. It will be shown how it is possible to apply both the gain and the phase change of the output signal in CUSUM tests. The method is demonstrated using an example.

5

On-line model identification for active noise control using integrated bispectrum analysis

Główka T.

Archives of Control Sciences

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2007

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Vol. 17, no. 2

191-207

EN

In the paper a problem of the on-line model identification of secondary and feedback paths in the feedforward ANC system is considered. The system is closed-loop, with low signal-to-noise ratio and with the disturbance affecting the input and output of the identified paths. To overcome the mentioned difficulties a new approach to the identification based on the higher-order spectra is presented. The integrated bispectrum-based identification method is proposed and the results of its applying are provided and compared with the results derived from the classical methods. The estimates are computed on the basis of data acquired in the laboratory (real-world) experiment as well as in the computer simulations.

6

Use of neural networks for dynamic modelling and predictive control of power plant systems

Lazar C., Carari S., Vrabie D., Ivana D.

Systems Science

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2005

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Vol. 31, no 1

37-44

EN

Boiler drum is a critical power plant component having nonlinearities and a non-minimum phase response but, despite this fact, control structures with PID controllers are usually used in industrial applications. In the last decades, important efforts have been made to improve the closed loop performance of the drum level controller by using on-line self-tuning approaches. In this paper, such a method of on-line adaptation is presented based on a neuro-predictive technique of the authors of [4], [5]. In order to implement the neuro-predictive procedure a neural model was developed for drum level process. By means of simulation, a comparison between the obtained drum level controller's operation and that of a classic controller of the type PI under similar conditions is carried out.

7

Control Systems Structures and Their Robustness

Skoczowski S.

Pomiary Automatyka Kontrola

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2003

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R. 49, nr 6

5-9

EN

Linear SISO control structures affected by perturbations and disturbances have been analyzed from the viewpoint of their imput and disturbance sensitivity for the case of known and unknown process time delay. It has been shown that disturbance sensitivity is essential quantity, which differentiates the structuers under study in terms of their sensitivity.

PL

Porównano wrażliwość wejściową oraz zakłóceniową liniowych struktur SISO układów regulacji w obecności pertubacji multiplikatywnych oraz zakłóceń sprawdzonych do wyjścia, dla przypadku nieznanego i znanego opóźnienia procesu. Wykazano, że wrażliwość zakłóceniowa decyduje o zróżnicowaniu właściwości odpornościowych rozważonych struktur.

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Decentralized adaptive output feedback stabilization for a class of interconnected systems with unknown bound of uncertainties.

Fenlin L., Yuan L., Hao W., Siying Z.

Systems Science

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2001

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Vol. 27, nr 3

35-48

EN

The problem of adaptive decentralized stabilization for a class of linear time-invarying large-scale systems with nonlinear interconnectivity and uncertainties is discussed. The bounds of uncertainties are assumed to be unknown. For such uncertain dynamic systems, an adaptive decentralized controller is presented. The resulting closed-loop systems are asymptotically stable in theory. Moreover, an adaptive decentralized control scheme is given. The scheme ensures the closed-loop systems exponentially practically stable and can be used in practical engineering. Finally, simulations show that the control scheme is effective.