Wyniki wyszukiwania - BazTech

1

Designing optimal solar water pumping stations for irrigation of agricultural lands

Haase Gundolf, Kirakossian Gagik T., Kirakossyan Gagik H., Mkrtchyan Vazgen A.

Przegląd Naukowy Inżynieria i Kształtowanie Środowiska

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2023

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Vol. 32, No. 3

270--283

EN

An investigation into the design of a stand-alone solar water pumping station for supplying rural areas is presented. It includes a study of system components and their modeling. The solar water pumping station comprises a solar panel, DC/DC buck converter, DC motor driving a centrifugal pump, and a reservoir. The fuzzy-based maximum power point tracker is developed to optimize the drive speed and the water discharge rate of the coupled centrifugal pump. These use dN/I, d(dN/dI) use parameters, and a variation of the fill factor∆α as input variables. The proposed solution is based on a judicious fuzzy adjustment of a converter fill factor, which adapts online the load impedance to the solar panel. The simulation results show the effectiveness of the drive system for both transient and steady-state operations. Hence, it is suitable to use this fuzzy logic procedure as a standard optimization algorithm for such solar water pumping stations. The modeling is carried out in MATLAB/Simulink.

2

Robust fuzzy sliding mode control implementation for DC motor

Zaghrat Fatiha, Gasbaoui Brahim, Bouchiba Bousmaha, Bousserhane Ismail Khalil, Chaoufi Imane

Przegląd Elektrotechniczny

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2022

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R. 98, nr 5

97--102

EN

This article presents a fuzzy sliding mode control (FSMC) to improve the speed performance of DC motor in direct and opposite directions, where two FSMC approaches are developed and implemented based on the DSpace 1104 board and compared to SMC. Although, the SMC ensures big robustness and excellent disturbance rejection it has a limited application because of the chattering phenomenon that is the main downside of SMC. Firstly, the SMC design speed and current controllers are presented. Secondly, two FSMC approaches are shown. In the first approach, we have a similar control rule as the SMC with the exceptions of the k and ksi of discontinuous control signal parameters which are adapted by a fuzzy inference system. In the second approach, totally we delete the discontinuous control and replace it with an FLC. This article focuses on the design of the FSM speed controller and the estimation of the resistive torque. The numerical and experimental validation results of the FSM second approach have shown a robust mechanism performance with a fast dynamic response, good tracking of the reference speed, zero overshoot compared to SMC (1.22%) and FSM first approach (0.09%), and good rejection Disturbance. Besides, the FSM second approach has the best reduction of chattering phenomenon compared to the FSM first approach and classical SMC.

PL

W tym artykule przedstawiono rozmytą kontrolę trybu ślizgowego (FSMC) w celu poprawy wydajności prędkości silnika prądu stałego w kierunkach bezpośrednich i przeciwnych, w której opracowano i wdrożono dwa podejścia FSMC w oparciu o płytę DSpace 1104 i porównano z SMC. Chociaż SMC zapewnia dużą wytrzymałość i doskonałe tłumienie zakłóceń, ma ograniczone zastosowanie ze względu na zjawisko drgania, które jest główną wadą SMC. W pierwszej kolejności przedstawiono projektowe kontrolery prędkości prądu SMC. Po drugie, pokazano dwa podejścia FSMC. W pierwszym podejściu mamy podobną zasadę sterowania jak SMC, z wyjątkiem parametrów k i ksi nieciągłych parametrów sygnału sterującego, które są dostosowywane przez rozmyty system wnioskowania. W drugim podejściu całkowicie usuwamy nieciagłą kontrolę i zastępujemy ją FLC. W tym artykule skupiono się na konstrukcji regulatora prędkości FSM i estymacji momentu rezystancyjnego. Numeryczne i eksperymentalne wyniki walidacji drugiego podejścia FSM wykazały solidne działanie mechanizmu z szybką odpowiedzia dynamiczną, dobrym śledzeniem prędkości odniesienia, zerowym przeregulowaniem w porównaniu z SMC (1,22%) i pierwszym podejściem FSM (0,09%) oraz dobrą odrzucenie Zakłócenie. Poza tym drugie podejście FSM ma najlepszą redukcję zjawiska drgania w porównaniu z pierwszym podejściem FSM i klasycznym SMC.

3

Self tuning filter and fuzzy logic control of shunt active power filter for eliminates the current harmonics constraints under unbalanced source voltages and loads conditions

Chebabhi A., Abdelhalim K., Fellah F. M. K.

Journal of Power Technologies

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2018

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Vol. 98, nr 1

1--19

EN

Shunt active power filters (SAPFs) are modern filtering technologies for source current harmonic elimination and source reactive power compensation of nonlinear loads. In the case of normally balanced source voltages, the SAPFs are controlled to eliminate a wide range of source current harmonics and compensate the source reactive power generated by non-linear loads to provide source current functions with maximum power factor. However, if source voltages are unbalanced and/or distorted, these control objectives cannot be achieved, which impacts the SAPFs performances. In the present paper, we propose a new modification to extend the stable dynamic range and to enhance the transient response of a classical phase locked loop (CPLL). An enhanced phase locked loop (EPLL) based on a self tuning filter (STF) and fuzzy logic control (FLC) associated with SRF theory are used in four leg shunt active power filter control under unbalanced source voltages and nonlinear loads. The aim is to enable the SAPFs to reach a higher compensation level of reactive power and current harmonics for all cases of source voltages and nonlinear loads for the limits specified in IEEE Std. 519. The success, robustness, and effectiveness of proposed control circuits are demonstrated through simulation, using Sim Power Systems and S-Function of MATLAB/SIMULINK.

4

Designing of power system stabilizer based on the root locus method with lead-lag controller and comparing it with PI controller in multi-machine power system

Jalali S., Shahgholian G.

Journal of Power Technologies

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2018

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Vol. 98, nr 1

45--56

EN

This paper presents a method for designing a multi-machine power system stabilizer. The conventional design technique using a single machine infinite bus approximation involves a frequency response estimation called GEP(s). Frequency response is estimated between the input AVR and electrical output torque. The power system stabilizer is designed by frequency response and based on the root locus method to improve the damping of oscillatory modes. By using this method, we can adjust the structure of the PSS compensator and its parameters in the multi-machine system and it does not need to know the equivalent reactance of output and voltage of the infinite bus or the other estimations in every machine. In the proposed method, information available at the high voltage bus of the step-up transformer is used to set up a modified Heffron-Phillips model. Finally, this method is examined on three test systems. Simulation results indicate the performance and effectiveness of the proposed method.

5

Research of an omnidirectional mecanum-wheeledplatform with a fuzzy logic controller

Typiak A., Rykała Ł.

Journal of KONES

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2018

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Vol. 25, No. 1

423--432

EN

This article presents the process of designing a fuzzy logic controller (FLC) to be applied in the control system for the tracking movement of an omnidirectional Mecanum-wheeled platform, where the tracking movement is defined as the execution of a specific movement of the omnidirectional Mecanum-wheeled platform along a preset path. The conventional PID controller, which is a popular choice for control systems, was replaced with a control algorithm featuring fuzzy logic elements. The findings from numerical testing of the control system with the applied FLC were compared with the results of numerical testing using a variant of a conventional PID controller. The comparison led to a feasibility study of the FLC for the kinematic control of the omnidirectional Mecanum-wheeled platform. The article compares the results of applying an FLC and a variant of a conventional PID controller for the tracking control of an omnidirectional-wheeled platform with mecanum wheels. It was assumed in this work that kinematic equations would be sufficient in this case to plan the trajectory (path) of a characteristic point for the omnidirectional-wheeled platform.

6

Comparative study of pi and fuzzy logic based speed controllers of an ev with four in-wheel induction motors drive

Ghezouani A., Gasbaoui B., Nair N., Abdelkhalek O., Ghouili J.

Journal of Automation Mobile Robotics and Intelligent Systems

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2018

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Vol. 12, No. 3

43--54

EN

This paper presents the modeling, control and simulation of an electric vehicle with four in-wheel 15 kw induction motors drive 4WDEV controlled by a direct torque control DTC strategy, where two control techniques are presented and compared for controlling the electric vehicle speed: the first one is based on a classical PI controller while the second one is based on a fuzzy logic controller (FLC). The aim is to evaluate the impact of the proposed FLC controller on the efficiency of the 4WDEV taking into account vehicle dynamics performances, autonomy and battery power consumption. When the classical controller can’t ensure the electric vehicle stability in several road topology situations. To show the efficiency of the proposed new control technique on the traction system by 4WDEV. The vehicle has been tested in different road constraints: straight road, sloping road and curved road to the right and left using the Matlab / Simulink environment. The analysis and comparison of the simulation results of FLC and PI controllers clearly show that the FLC ensures better performances and gives a good response without overshoot, zero steady state error and high load robustness rejection, compared to the PI controller which is present an overshoot equal 7.3980% and a rise time quite important (0.2157 s with PI controller and 0.1153 s with FLC). As well as the vehicle range has been increased by about 10.82 m throughout the driving cycle and that the energy consumption of the battery has been reduced by about 1.17% with FLC.

7

Dynamic response improvement of hybrid system by implementing ANN-GA for fast variation of photovoltaic irradiation and FLC for wind turbine

Izadbakhsh M., Rezvani A., Gandomkar M.

Archives of Electrical Engineering

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2015

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Vol. 64, nr 2

291--314

EN

In this paper, dynamic response improvement of the grid connected hybrid system comprising of the wind power generation system (WPGS) and the photovoltaic (PV) are investigated under some critical circumstances. In order to maximize the output of solar arrays, a maximum power point tracking (MPPT) technique is presented. In this paper, an intelligent control technique using the artificial neural network (ANN) and the genetic algorithm (GA) are proposed to control the MPPT for a PV system under varying irradiation and temperature conditions. The ANN-GA control method is compared with the perturb and observe (P&O), the incremental conductance (IC) and the fuzzy logic methods. In other words, the data is optimized by GA and then, these optimum values are used in ANN. The results are indicated the ANN-GA is better and more reliable method in comparison with the conventional algorithms. The allocation of a pitch angle strategy based on the fuzzy logic controller (FLC) and comparison with conventional PI controller in high rated wind speed areas are carried out. Moreover, the pitch angle based on FLC with the wind speed and active power as the inputs can have faster response that lead to smoother power curves, improving the dynamic performance of the wind turbine and prevent the mechanical fatigues of the generator.

8

Układ sterowania pracą żurawia samochodowego wyposażonego w układ minimalizacji wahań i układy korekcyjne z nieliniowymi charakterystykami

Janusz J., Kłosiński J.

Transport Przemysłowy i Maszyny Robocze

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2014

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Nr 2

18--23

PL

Proces przenoszenia dużych ładunków oraz stosowanie dużych wysięgów może stworzyć zagrożenie przewrócenia się żurawia samochodowego. Zwiększa się wówczas moment wywracający żuraw i jeśli jego wartość przekroczy wartość momentu sił stabilizujących położenie żurawia, maszyna może się przewrócić [1, 7].

EN

Replacement of a payload using a mobile crane is performed via an adequate composition of work movements. In the paper, the mathematical model of the control system is presented. The system controls the slewing motion of the chassis as well as it is equipped in the model of the emergence subsystem which changes the jib reach. Some results of numerical investigations are presented in the paper.

9

Analiza porównawcza strat mocy w trzypoziomowych falownikach typu FLC oraz typu NPC

Płatek T.

Przegląd Elektrotechniczny

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2011

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R. 87, nr 6

111-117

PL

Przedstawiony niżej artykuł opisuje w sposób porównawczy niektóre cechy trzypoziomowych falowników z kondensatorami o zmiennym potencjale (FLC) oraz trzypoziomowych falowników z diodami poziomującymi (NPC). Szczególną uwagę poświęcono zagadnieniom strat mocy w falownikach trzypoziomowych typu FLC oraz NPC, odniesionych dodatkowo do strat mocy w falowniku dwupoziomowym.

EN

The article presented below describes in a comparative way some of the characteristics of three-level inverters with floating potential capacitors (FLC) and three-level inverters with leveling diodes (NPC). Particular attention was paid to issue of power losses in FLC and NPC threelevel inverters, related additionally to power losses in two-level inverter. (Comparative analysis of power losses in three-level FLC and NPC inverters.

10

Modulator trzypoziomowego falownika typu FLC z regulacją napięcia na kondensatorze o zmiennym potencjale

Płatek T., Rąbkowski J.

Przegląd Elektrotechniczny

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2010

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R. 86, nr 4

266-272

PL

Artykuł opisuje oryginalny modulator szerokości impulsów trzypoziomowego falownika typu FLC (ang. Flying Capacitor) opracowany w celu zastosowania w filtrze aktywnym. Oprócz możliwości kształtowania napięcia wyjściowego zapewnia on także stabilizację napięć na kondensatorach o zmiennym potencjale. W pracy przedstawiono zasadę działania modulatora, podano wyniki badań symulacyjnych i eksperymentalnych jednofazowego falownika trzypoziomowego.

EN

The paper describes the original PWM modulator of the flying capacitor converter developed to Active Power Filter application. Besides output voltage control, presented solution provides control and stabilization of the voltage across the flying capacitor during transients of the DC circuit. The paper consists of the modulator description, simulations as well as experimental results of the single phase, three-level inverter.

11

Surface electroclinic effect in cell with mixtures showing V-shaped electrooptical switching

Perkowski P.

Biuletyn Wojskowej Akademii Technicznej

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2002

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Vol. 51, nr 1

103-119

EN

V-shaped switching in ferroelectric liquid crystal mixture was investigated. It was found difficult to prepare homogenous orientation in liquid crystal cell. After typical, symmetrical preparation of the cell, two-domain texture was obtained. The simple theory was worked out using some symmetry arguments and some experimental, observation. After this the new samples were prepared, using non-symmetrical treatment. Textures obtained using this way is much better than the previous ones. This paper presents the results of theoretical studies as well as experimental investigations.

PL

W pracy przedstawiono rozważania dotyczące powierzchniowego efektu elektroklinowego. Na podstawie zaproponowanego modelu teoretycznego oraz danych doświadczalnych prześledzono wpływ tego efektu na występowa nie w ferroelektrycznych ciekłych kryształach tekstury dwudomenowej w komórkach ciekłokrystalicznych, wykazujących przełączanie typu V.

12

Zastosowanie logiki rozmytej do modelowania i sterowania systemów ciepłowniczych

Hunek W.

Chemistry-Didactics-Ecology-Metrology

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2001

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R. 6, NR 1-2

43--46

PL

Przedstawiono możliwości zastosowania regulatora rozmytego typu Mamdaniego jako efektywnego narzędzia do sterowania pracą węzła grzewczego, znajdującego się w budynku dydaktycznym. W tym celu na podstawie danych technologicznych i pomiarowych został stworzony przybliżony model budynku. Przedstawiono działanie sterownika rozmytego podczas różnego rodzaju dobowych zakłóceń. Badania symulacyjne przeprowadzono za pomocą pakietu Matlab/Simulink.

EN

A simulation study of a Fuzzy Logic Controller applied to control of a local heating centre for an office building was presented. An approximate model of the building has been constructed which is based on technological and measured data. An operation of FLC under various daily disturbances has been showed. The simulation analysis is based of the Matlab/Simulink environment.

13

Control strategies of PWM inverter-fed induction

Kaźmierkowski M.P.

Zeszyty Naukowe. Elektryka / Politechnika Łódzka

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1998

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z. 90

73--95

EN

In this paper a review of control methods for high performance PWM inverter-fed induction motor drives is presented. Starting from the description of an induction motor by the help of the space vectors, three basic control strategies are discussed. As first, the most popular Field Oriented Control (FOC) is described. Secondly, the Direct Torque and Flux vector Control (DTFC) method, which - in contrast to FOC - depart from idea of coordinate transformation and analogy with DC motor, is briefly characterized. The last group is based on Feedback Linearization Control (FLC) and can be easy combined with sliding mode control. The simulation and experimental oscillograms that illustrate the performance of the discussed control strategies are shown.

PL

W pracy podano przegląd metod sterowania silnika indukcyjnego zasilanego z falownika MSI w napędach o wysokich właściwościach dynamicznych. Omówiono trzy podstawowe metody sterowania z wykorzystaniem opisu silnika indukcyjnego przy użyciu wektorów przestrzennych. Najpierw opisano najbardziej popularną metodę sterowania połowo zorientowanego (FOC). Następnie przedstawiono krótko sterowanie bezpośrednie momentu i wektora strumienia (DTFC), które w przeciwieństwie do FOC nie wykorzystuje transformacji współrzędnych i bazuje na analogu z silnikiem prądu stałego. Ostatnia metoda jest oparta na linearyzacji przez sprzężenie zwrotne (FLC) i może być łatwo połączona z wykorzystaniem ruchu ślizgowego. W pracy zamieszczono wyniki symulacji i oscylogramy ilustrujące właściwości przedstawionych metod sterowania.