Wyniki wyszukiwania - BazTech

1

Compensation of supply current harmonics, reactive power, and unbalanced load current balance in the closed-loop control of a shunt active power filter

Bielecka Agata, Wojciechowski Daniel

Zeszyty Naukowe Akademii Morskiej w Szczecinie

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2020

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nr 61 (133)

9--16

EN

This paper presents the compensation tasks performed by a shunt active power filter, including compensation of harmonic currents, reactive power, and an unbalanced load current. The paper demonstrates novel control of the shunt active power filter in a closed-loop system. The control algorithm was verified by performing simulations and compared the simulated results with those obtained in an open-loop control system. All simulations were conducted in the PLECS program using a control algorithm written in C programming language.

2

In silico testing of optimized Fuzzy P+D controller for artificial pancreas

Soylu S., Danisman K.

Biocybernetics and Biomedical Engineering

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2018

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Vol. 38, no. 2

399--408

EN

Background and objectives: Despite therapeutic advances, a complete cure has not been found yet for patients with type 1 diabetes (T1D). Artificial pancreas (AP) is a promising approach to cope with this disease. The controller part of the AP can compute the insulin infusion rate that keeps blood glucose concentration (BGC) in normoglycemic ranges. Most controllers rely on model-based controllers and use manual meal announcements or meal detection algorithms. For a fully automated AP, a controller only using the patient's BGC data is needed. Methods: An optimized Mamdani-type hybrid Fuzzy P+D controller was proposed. Using the University of Virginia/Padova Simulator, a 36 h scenario was tested in nine virtual adult patients. To take into account the effect of continuous glucose monitor noise, the scenario was repeated 25 times for each adult.The main outcomes were the percentage of time BGC levels in the euglycemic range, low blood glucose index (LBGI), and blood glucose risk index (BGRI), respectively. Results: The obtained BGC values were found to be in the euglycemic range for 82.6% of the time. Moreover, the BGC values were below 50 mg/dl, below 70 mg/dl and above 250 mg/dl for 0%, 0.35% and 0.74% of the time, respectively. The BGRI, LBGI, and high blood glucose index (HBGI) were also found as 3.75, 0.34 and 3.41, respectively. The proposed controller both increases the time the BGC levels in the euglycemic range and causes less hypoglycemia and hyperglycemia relative to the published techniques studied in a similar scenario and population.

3

Closed-loop Laser Stabilization System

Plewinski P., Makowski D., Mielczarek A., Napieralski A.

Elektronika : konstrukcje, technologie, zastosowania

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2016

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Vol. 57, nr 12

22--26

EN

European XFEL project developed in Hamburg by Deutsches Elektronen-Synchrotron contains a linear accelerator capable of generating light pulses at extremely short wavelengths, which will enable observing short lasting phenomena at atomic scale. Mode-locked lasers are commonly used in such facilities. Laser diode driver (LDD) is a significant element in the beam monitoring system, which will be used in the XFEL laser. Its role is to provide constant current source, linear, noiseless, and accurate, that delivers exactly the current to the laser diode that it needs to operate for a particular application. To ensure stable power output to the laser diode, PI controller was implemented. The code of the PI routine was optimized to enable higher frequency of its execution, which should improve the regulation parameters. This paper presents the microprocessor-based laser diode driver that can be used for a free electron laser system. It focuses on the firmware based on a real-time operating system (RTOS) developed to provide good stability of PI regulation combined with high flexibility in terms of system control.

PL

European XFEL to projekt lasera z akceleratorem liniowym budowany w Hamburgu przez Deutsches Elektronen-Synchrotron. Jest zdolny do generowania impulsów światła o ekstremalnie krótkich częstotliwościach. Dzięki temu umożliwi obserwację krótkotrwałych zjawisk w skali atomowej. Lasery synchronizowane fazowo są powszechnie wykorzystywane w tego typu systemach. Sterownik Diody Laserowej (LDD) jest istotnym elementem systemu monitorowania wiązki laserowej, który zostanie użyty w laserze XFEL. Jest to liniowe źródło prądowe o stałym natężeniu i niskim poziomie szumów, którego zadaniem jest dostarczanie zadanego napięcia odpowiedniego do potrzeb konkretnego zastosowania. Kontroler PI został wykorzystany, aby zapewnić dostarczanie stałej mocy do diody laserowej. Kod kontrolera został zoptymalizowany tak, aby uzyskać wyższą częstość jego wykonania, co powinno mieć pozytywny wpływ na jakość regulacji. Artykuł przedstawia sterownik diody laserowej oparty na mikroprocesorze, który może być użyty w laserach na swobodnych elektronach. Opisane jest w szczególności oprogramowanie oparte o system czasu rzeczywistego, zaprojektowany tak, aby zapewnić wysoką stabilność regulacji kontrolerem PI oraz dużą elastyczność w zakresie sterowania.

4

Sterowanie położeniem odwróconego wahadła w pętli zamkniętej

Ciężkowski M., Siemieniako F.

Aparatura Badawcza i Dydaktyczna

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2012

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T. 17, nr 1

57-62

PL

Praca zawiera opis stanowiska pomiarowego do badania odwróconego wahadła oraz wyniki doświadczeń, które zostały uzyskane na tym stanowisku. Ze względu na zastosowanie regulatora liniowo-kwadratowego do sterowania układem, artykuł zawiera opis modelu matematycznego wahadła, który jest niezbędny do wyznaczenia parametrów regulacji.

EN

The paper contains a description of the measurement system for studying the inverted pendulum and the experimental results obtained in this system. Due to applied the linear-quadratic regulator, the article describes a mathematical model of the pendulum, which is necessary to determine the control parameters.