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    Wyświetlanie 1-11 z 11
    Tytuł:
    Intermittent power smoothing control for grid connected hybrid wind/PV system using battery-EDLC storage devices
    Autorzy:
    Jayalakshmi, N.S.
    Gaonkar, D.N.
    Karthik, R.P.
    Prasanna, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/141664.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    energy storage devices
    inverter controller
    MPPT controller
    power smoothing
    PV system
    wind power
    Opis:
    Wind and solar radiation are intermittent with stochastic fluctuations, which can influence the stability of operation of the hybrid system in the grid integrated mode of operation. In this research work, a smoothing control method for mitigating output power variations for a grid integrated wind/PV hybrid system using a battery and electric double layer capacitor (EDLC) is investigated. The power fluctuations of the hybrid system are absorbed by a battery and EDLC during wide variations in power generated from the solar and wind system, subsequently, the power supplied to the grid is smoothened. This makes higher penetration and incorporation of renewable energy resources to the utility system possible. The control strategy of the inverter is realized to inject the power to the utility system with the unity power factor and a constant DC bus voltage. Both photovoltaic (PV) and wind systems are controlled for extracting maximum output power. In order to observe the performance of the hybrid system under practical situations in smoothing the output power fluctuations, one-day practical site wind velocity and irradiation data are considered. The dynamic modeling and effectiveness of this control method are verified in the MATLAB/Simulink environment. The simulation results show that the output power variations of the hybrid wind/PV system can be significantly mitigated using the combination of battery and EDLC based storage systems. The power smoothing controller proposed for the hybrid storage devices is advantageous as compared to the control technique which uses either battery or ultracapacitor used for smoothing the fluctuating power.
    Źródło:
    Archives of Electrical Engineering; 2020, 69, 2; 433-453
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Power injection control system and experimental model based on manufacturer characteristic curves for a photovoltaic generation system
    Autorzy:
    Rico, A.
    Cadaval, E. R.
    Montero, M. I. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/262582.pdf
    Data publikacji:
    2007
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
    Tematy:
    Inverter Current Controller (ICC)
    Inverter Reference Current Generator (ICRG)
    maximum power point tracking (MPPT)
    Photovoltaic Cell (PV Cell)
    PV Voltage and PV Current
    VI characteristic equations
    Opis:
    This paper attempts to validate the performance of a power injection control block for Photovoltaic Generation Systems (PVGS). This device uses a control module based on detecting the power injected into the supply by the inverter, instead of measuring the power generated by the PVGS. The performance is evaluated using the concept of Maximum Energy Curve that takes into account both transient and permanent control performance. The paper presents a basic and simple procedure to obtain a model from the manufacturer characteristic curves of the photovoltaic cells. MATLAB Simulink is used as simulation tool to obtain the response of the proposed system to changes in temperature and irradiance.
    Źródło:
    Electrical Power Quality and Utilisation. Journal; 2007, 13, 2; 69-75
    1896-4672
    Pojawia się w:
    Electrical Power Quality and Utilisation. Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adjusting output impedance using a PI controller to improve the stability of a single-phase inverter under weak grid
    Autorzy:
    Jiao, J.
    Nelms, R. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/136224.pdf
    Data publikacji:
    2016
    Wydawca:
    EEEIC International Barbara Leonowicz Szabłowska
    Tematy:
    grid impedance
    inverter output impedance
    LC filter
    PI controller
    single-phase inverter
    Opis:
    Explored in this paper is the grid impedance effect on the stability of a single-phase grid connected inverter with an LC filter based on an analysis of the inverter output impedance. For a single-phase grid connected inverter, a PI controller is often used to regulate the current injected into the grid. However, the control performance can be influenced when the inverter is connected to a weak grid. Also, the utility grid has background harmonic noise, which can make the injected current distorted. Therefore, analysis of the output impedance of a single-phase grid connected inverter is important for the robustness and stability of the system. By modeling the output impedance of inverter, it can be determined that the proportional gain and integral gain of the controller have an effect on the output impedance. Analytical results show that by adjusting the PI controller parameters, the ability for harmonic reduction and stability of the system can be improved. Simulation and experiments using a 1 kW single-phase grid connected inverter verify the effectiveness of the theoretical analysis.
    Źródło:
    Transactions on Environment and Electrical Engineering; 2016, 1, 4; 50-57
    2450-5730
    Pojawia się w:
    Transactions on Environment and Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A closed-loop power controller model of series-resonant-inverter-fitted induction heating system
    Autorzy:
    Pal, P.
    Roy, D.
    Datta, A.
    Sadhu, P. K.
    Banerjee, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/141721.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    induction heating
    power controller
    PID
    series resonant inverter
    MATLAB
    Opis:
    This paper presents a mathematical model of a power controller for a high-frequency induction heating system based on a modified half-bridge series resonant inverter. The output real power is precise over the heating coil, and this real power is processed as a feedback signal that contends a closed-loop topology with a proportional-integral-derivative controller. This technique enables both control of the closed-loop power and determination of the stability of the high-frequency inverter. Unlike the topologies of existing power controllers, the proposed topology enables direct control of the real power of the high-frequency inverter.
    Źródło:
    Archives of Electrical Engineering; 2016, 65, 4; 827-841
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    System automatycznego sterowania w pomiarach przepływem wody
    The automatic control system in flow measurement
    Autorzy:
    Szlachta, A.
    Odon, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/268597.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
    Tematy:
    falownik
    przepływomierz
    regulator PID
    LabVIEW
    inverter
    flow meter
    PID controller
    Opis:
    Artykuł prezentuje system automatycznego sterowania przepływem wody w obiegu zamkniętym. Omówiono aplikację sterującą przepływem wody na stanowisku. Zaprezentowano wieloczujnikowy system pomiarów. Na omawianym stanowisku przeprowadzane są badania metod statystycznych w pomiarach dwufazowych.
    The system of automatic control of the water flow in a closed circuit has been presented in this paper. The laboratory stand allows to control the inverter on the position of research flows. Measurements were concerned a liquid in two-phase (water and air). The application to control the water flow was also discussed. The multi-sensors measurement system was presented. The laboratory stands have been realized for the results verification made obtained from mathematical models, computer simulations and signals acquisition using the stochastic methods. The statistical methods in the measurement of two-phase of statistical methods used in time delay estimation: direct cross-correlation and the function of conditional average value of delayed signal were carried out in the study for this stand.
    Źródło:
    Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2017, 57; 137-140
    1425-5766
    2353-1290
    Pojawia się w:
    Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design of a Subscription Based Community Solar Energy System for the Business Community of the “Back Gate”, Alex Ekwueme Federal University Ndufu-Alike, Ikwo, Ebonyi State, Nigeria
    Autorzy:
    Daniel, Thomas Ojonugwa
    Obot, Enobong Patrick
    Azuoko, George-Best
    Negedu, Isaac Onuche
    Amah, Orji
    Powiązania:
    https://bibliotekanauki.pl/articles/1818428.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Polityki Energetycznej im. Ignacego Łukasiewicza
    Tematy:
    community solar energy
    charge controller
    inverter, battery
    Smart meter
    Photovoltaic array
    Opis:
    This study presents a model design of a subscription based community solar energy for the business community of the “Back gate”, Alex Ekwueme Federal University Ndufu-Alike Ikwo. The business community is largely dependent on the use of fossil fuel generators due to the absence of connection to the Nigeria national electricity grid. The extensive use of the fossil fuel is not only associated with environmental pollution and global warming but its reserve is also finite, non-renewable and expensive. This study presents the use of solar energy to supply the electrical energy need of twenty (20) business premises at the study location. The design was carried out according to the daily electrical load profile of the community, taking into consideration the solarirradiation data of the location, the geographical location and the weather condition. The sizing of each of the system components and the economic analysis of the system in terms of the life cycle cost and electricity unit cost was also taken into consideration. The subscription based community solar with smart meter control gives energy access at reduce cost, the total unit of consumption, unit balance and other energy status per time.The unit cost of electricity using the model design was determined as #0.078/kWh which is cheaper with real time energy costing via a smart meter thereby encouraging the usage of the energy system as an efficient system with enhanced energy accessibility, real time energy services, climate change adaption by reduction of greenhouse gas emission, clean energy development plans/implementation within the community and an investment platform for would-be investors and philanthropist.
    Źródło:
    Energy Policy Studies; 2020, 2 (6); 3--20
    2545-0859
    Pojawia się w:
    Energy Policy Studies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling and simulation of sinusoidal pulse width modulation controller for solar photovoltaic inverter to minimize the switching losses and improving the system efficiency
    Autorzy:
    Panneerselvam, Sivaraj
    Kandasamy, Karunanithi
    Perumal, Chandrasekar
    Powiązania:
    https://bibliotekanauki.pl/articles/2135736.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    efficiency
    IGBT
    MOSFET
    PV inverter
    MATLAB/SIMULINK
    SPWM controller
    switching loss
    Opis:
    With the extinction of fossil fuels and high increase in power demand, the necessity for renewable energy power generation has increased globally. Solar PV is one such renewable energy power generation, widely used these days in the power sector. The inverters used for power conversion suffer from power losses in the switching elements. This paper aims at the detailed analysis on switching losses in these inverters and also aims at increasing the efficiency of the inverter by reducing losses. Losses in these power electronic switches vary with their types. In this analysis the most widely used semiconductor switches like the insulated gate bipolar transistor (IGBT) and metal oxide semiconductor field effect transistor (MOSFET) are compared. Also using the sinusoidal pulse width modulation (SPWM) technique, improves the system efficiency considerably. Two SPWM-based singlephase inverters with the IGBT and MOSFET are designed and simulated in a MATLAB Simulink environment. The voltage drop and, thereby, the power loss across the switches are compared and analysed. The proposed technique shows that the SPWM inverter with the IGBT has lower power loss than the SPWM inverter with the MOSFET.
    Źródło:
    Archives of Electrical Engineering; 2022, 71, 3; 615--626
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design of a Subscription Based Community Solar Energy System for the Business Community of the “Back Gate”, Alex Ekwueme Federal University Ndufu-Alike, Ikwo, Ebonyi State, Nigeria
    Autorzy:
    Daniel, Thomas Ojonugwa
    Obot, Enobong Patrick
    Azuoko, George-Best
    Negedu, Isaac Onuche
    Amah, Orji
    Powiązania:
    https://bibliotekanauki.pl/articles/1818436.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Polityki Energetycznej im. Ignacego Łukasiewicza
    Tematy:
    community solar energy
    charge controller
    inverter, battery
    Smart meter
    Photovoltaic array
    Opis:
    This study presents a model design of a subscription based community solar energy for the business community of the “Back gate”, Alex Ekwueme Federal University Ndufu-Alike Ikwo. The business community is largely dependent on the use of fossil fuel generators due to the absence of connection to the Nigeria national electricity grid. The extensive use of the fossil fuel is not only associated with environmental pollution and global warming but its reserve is also finite, non-renewable and expensive. This study presents the use of solar energy to supply the electrical energy need of twenty (20) business premises at the study location. The design was carried out according to the daily electrical load profile of the community, taking into consideration the solarirradiation data of the location, the geographical location and the weather condition. The sizing of each of the system components and the economic analysis of the system in terms of the life cycle cost and electricity unit cost was also taken into consideration. The subscription based community solar with smart meter control gives energy access at reduce cost, the total unit of consumption, unit balance and other energy status per time.The unit cost of electricity using the model design was determined as #0.078/kWh which is cheaper with real time energy costing via a smart meter thereby encouraging the usage of the energy system as an efficient system with enhanced energy accessibility, real time energy services, climate change adaption by reduction of greenhouse gas emission, clean energy development plans/implementation within the community and an investment platform for would-be investors and philanthropist.
    Źródło:
    Energy Policy Studies; 2020, 2 (6); 3--20
    2545-0859
    Pojawia się w:
    Energy Policy Studies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Laboratoryjny system wentylacji z regulatorem rozmytym zrealizowanym w środowisku LabVIEW
    The laboratory ventilation system with a fuzzy logic controller implemented in LabVIEW
    Autorzy:
    Frania, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/158065.pdf
    Data publikacji:
    2014
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    falownik napięcia PWM
    logika rozmyta
    LabVIEW
    regulator rozmyty
    PWM inverter
    fuzzy logic
    fuzzy logic controller
    Opis:
    W artykule przedstawiono koncepcję laboratoryjnego systemu wentylacji zrealizowanego w celach dydaktycznych. Zaprojektowane stanowisko pozwala zaznajomić się z zasadą działania falownika napięcia PWM oraz środowiska LabVIEW, jako tzw. komputerowego systemu szybkiego prototypowania. W środowisku LabVIEW zaimplementowano opcję automatycznego sterowania systemem poprzez wykorzystanie regulatora rozmytego. Ponadto umożliwiając również, w celach dydaktycznych, modyfikowanie jego ustawień przez m.in. dobór funkcji przynależności, bazy reguł rozmytych, czy metody wyostrzania.
    The laboratory ventilation system (Fig. 1) presented in the paper is intended mainly for didactic purposes. One of the main advantages of the ventilation system is the ability to control mode selection – basic mode and extended mode. Availability of function blocks (Fig. 2) depends on the control mode. In the basic mode, only a speed control unit (Fig. 5) is available. Dynamic progress of power electronics has led to a change in the construction of drives with variable speed [1]. This function block uses a PWM inverter for air flow rate control. The PWM inverter supply 3-phase induction motor is currently the most popular solution for the drive system with variable speed [2]. In the extended mode, there are additionally available a heating control unit and a master control unit. The system uses a resistive heater. Its control (Fig. 7) is based on the group control method. One of the options in this mode is the ability of automatic adjustment using a fuzzy logic controller (Fig. 8). Fuzzy logic uses the knowledge base in the form of fuzzy rules of conditional if-then [3]. In this system, controller settings can be properly modified by the change of membership functions (Figs. 9, 10, 11), base of fuzzy rules (Tab. 1), or the method of defuzzification. In the extended mode, all control is made using a computer with LabVIEW software. The test results for the automatic adjustment proved the correctness of the system.
    Źródło:
    Pomiary Automatyka Kontrola; 2014, R. 60, nr 12, 12; 1228-1231
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stability analysis and efficiency improvement of IPFC using latest PR controller
    Autorzy:
    Gurijala, Sridhar Babu
    Kishore, D. Ravi
    Nittala, Ramchandra
    Godala, Rohith Reddy
    Powiązania:
    https://bibliotekanauki.pl/articles/1841160.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    control algorithms
    FACTS devices
    multilevel inverter
    interline power flow controller
    algorytmy sterowania
    FAKTY urządzeń
    falownik wielopoziomowy
    interline kontroler przepływu mocy
    Opis:
    The deviation from the ideal waveformcauses disturbances and failure of end-user load equipment. Power traveling a long distance from the generation plant to the end-user leads to deterioration of its quality, and the intensive utilization of power leads to serious issues in the grid resulting in power quality problems. To make the system effective and able to meet modern requirements, flexible AC transmission system (FACTS) devices should be installed into the grid. The interline power flow controller (IPFC) is the latest FACTS device, which compensates for both active and reactive power among multi-line systems. The converters used in the IPFC are crucial as they can be adjusted to regulate the power flow among the lines. This paper proposes a cascaded IPFC with hysteresis and proportional resonant voltage controllers. Some main drawbacks of controllers like steady-state errors and reference tracking of converters can be easily achieved by the PR controller, which makes the system efficient and can be used for a wide range of grid applications. Hysteresis and PR controllers are explained in detail in the following sections. A comparative analysis is carried out among control algorithms to choose the suitable controller which maintains stability in the system.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 3; 615-630
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Uncertainty mathematical models of power converters
    Niepewność modeli matematycznych układów energoelektronicznych
    Autorzy:
    Sieklucki, G.
    Bisztyga, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/282164.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    przekształtnik tyrystorowy
    falownik napięcia
    napęd elektryczny
    niepewność multiplikatywna
    regulator I I2
    element oscylacyjny
    sterowanie odporne
    thyristor-controlled converter
    voltage source inverter
    electric drive
    multiplicative uncertainty
    I I2 controller
    oscillatory element
    robust control
    Opis:
    The controller synthesis problem of the motor torque with parameters changes of the power converter is presented. The parameters uncertainty of the power converters described by gain and time-delay are analysed in the article. The principles of determining the range of the parameters variations are presented. The conversion method from the parametric to the dynamic uncertainty which can be useful to a robust controller optimization, is shown. A multiplicative uncertainty weight as the oscillatory element is proposed. The tuning of the I I2 controller parameters of the electromagnetic motor torque is introduced. The results are obtained by applying the mixed sensitivity method (robust performance) which is the optimization in H∞ space.
    W artykule przedstawiony został problem syntezy regulatora momentu elektromagnetycznego silnika przy zmianach parametrów układu zasilającego. W artykule analizowana jest niepewność parametrów układów zasilających silniki elektryczne, opisana przez wzmocnienie i opóźnienie czasowe. Podano zasady wyznaczania zakresu zmian tych parametrów. Przedstawiono metodę przekształcenia niepewności parametrycznej na dynamiczną, która może być wykorzystana w optymalizacji regulatora odpornego. Zaproponowano funkcję wagową niepewności multiplikatywnej w postaci elementu oscylacyjnego. Wyznaczono regulator I I2 momentu elektromagnetycznego dla silnika. Wyniki te uzyskano, stosując metodę mieszanej czułości, czyli optymalizację w przestrzeni H∞.
    Źródło:
    Automatyka / Automatics; 2012, 16, 1; 73-87
    1429-3447
    2353-0952
    Pojawia się w:
    Automatyka / Automatics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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