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    Wyświetlanie 1-8 z 8
    Tytuł:
    Effects of space vector modulation strategy on hybrid (Si-SiC) inverter losses
    Autorzy:
    Bonisławski, M.
    Hołub, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/140592.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    przekształtnik hybrydowy
    elektronika energetyczna
    urządzenie z szeroką przerwą energetyczną
    SVPWM
    DPWM
    power electronic inverter
    SiC diodes
    hybrid inverter
    wide band gap devices
    Opis:
    This work summarizes efficiency measurement results of a full bridge, 3 phase inverter composed of state-of-the-art Si IGBT transistors and Si or SiC diodes. Different (symmetrical and discontinuous) space vector modulation strategies were chosen in order to examine their influence (together with modulation frequency) on inverter losses. Induction machine was used as load, different load points were examined. Results clearly show, that proper modulation strategy, minimizing the switching losses of semiconductor switches, can increase the overall output efficiency at about 1% in case of both silicon and hybrid constructions. The drawback of DPWM approach is connected with the decreased quality of inverter output current. Hybrid technology can also improve the output efficiency at about 1% when compared to traditional constructions, but only in case of elevated switching frequencies. At low frequencies (below 10 kHz) modern semiconductor offer comparable results at much lower device costs.
    Źródło:
    Archives of Electrical Engineering; 2012, 61, 1; 69-75
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An improved space vector modulation strategy for common-mode voltage reduction in matrix rectifier
    Autorzy:
    Liu, X.
    Zhang, Q.
    Hou, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/950664.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    matrix converter
    space vector modulation
    common-mode voltage
    Opis:
    The matrix rectifier modulated by the classical space vector modulation (SVM) strategy generates common-mode voltage (CMV). The high magnitude and high du/dt of the CMV causes serious problems such as motor damage, electromagnetic noise and many others. In this paper, an improved SVM strategy is proposed by replacing the zero vectors with suitable couple of active ones that substantially eliminate the CMV. Theoretical analysis proves that the proposed strategy can reduce the amplitude of the CMV to half of the original value. In addition, the quality of the input and output waveforms is not affected by extra active vectors. Simulation and experimental results demonstrate the feasibility and effectiveness of the proposed strategy are shown.
    Źródło:
    Archives of Electrical Engineering; 2014, 63, 1; 93-106
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Six-phase motor drive supplied by four voltage source inverters with synchronized space-vector PWM
    Autorzy:
    Oleschuk, V.
    Grandi, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/140418.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    podwójny układ trójfazowy
    modulacja
    synchronizacja napięcia
    dual three-phase system
    modulation strategy
    voltage synchronization
    Opis:
    Novel method of space-vector-based pulsewidth modulation (PWM) has been disseminated for synchronous control of four inverters feeding six-phase drive based on asymmetrical induction motor which has two sets of windings spatially shifted by 30 electrical degrees. Basic schemes of synchronized PWM, applied for control of four separate voltage source inverters, allow both continuous phase voltages synchronization in the system and required power sharing between DC-sources. Simulations show a behavior of six-phase system with continuous and discontinuous versions of synchronized PWM.
    Źródło:
    Archives of Electrical Engineering; 2011, 60, 4; 445-458
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improved carrier phase shift modulation and voltage equalization control strategy in modular multilevel converter
    Autorzy:
    Jin, Hongtao
    Luo, Yinghong
    Fan, Yuheng
    Pan, Shengxiong
    Powiązania:
    https://bibliotekanauki.pl/articles/141004.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    circulation suppression
    modular multilevel converter
    improved carrier phase shifting
    switching frequency
    voltage equalization
    Opis:
    In order to solve the problem of traditional carrier phase-shift modulation with multiple ratios or PI controllers and cumbersome tuning parameters, this paper uses improved carrier phase-shift modulation. The total turn-on number of sub-modules each bridge arm is determined by comparing the sinusoidal modulated wave with the triangular carrier, and then the control signal is generated according to the capacitance voltage sorting result and the bridge arm current polarity. However, this modulation method uses a sorting method that causes the insulated gate bipolar transistor (IGBT) have an excessively high switching frequency. Therefore, a sorting trigger condition that can effectively reduce the switching frequency is used. The method determines whether to reorder based on the error between the voltage average and the actual value. For the circulation problem, the double-frequency negative sequence component is extracted by rotating coordinate transformation, and it is suppressed by PI control. A 21-level MMC model was built in MATLAB/simulink to analyze the sub-module capacitor voltage fluctuation, output current, voltage distortion rate and bridge arm circulation. It is verified that the modulation method can combine the sorting algorithm and circulation suppression method at the same time, and has better voltage equalization and circulation suppression effects.
    Źródło:
    Archives of Electrical Engineering; 2019, 68, 4; 803-815
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An approach to suppress high-frequency resonance using model predictive and selective harmonic elimination combined strategy
    Autorzy:
    Chen, Sitong
    Chen, Xiaoqiang
    Wang, Ying
    Xiong, Ye
    Powiązania:
    https://bibliotekanauki.pl/articles/1841300.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    CRH5 EMUs and traction power supply coupled system
    high-frequency oscillation
    high speed railway
    model predictive control (MPC)
    selective harmonic elimination pulse-width modulation (SHEPWM)
    CRH5 EMU i system sprzężony z zasilaniem trakcyjnym
    oscylacja wysokiej częstotliwości
    kolej dużych prędkości
    kontrola predykcyjna modelu (MPC)
    selektywna eliminacja harmoniczna modulacja szerokości impulsu (SHEPWM)
    Opis:
    High-frequency resonance is a prominent phenomenon which affects the normal operation of the high-speed railway in China. Aiming at this problem, the resonance mechanism is analyzed first. Then, model predictive control and selective harmonic elimination pulse-width modulation (MPC-SHEPWM) combined control strategy is proposed, where the harmonics which cause the resonance can be eliminated at the harmonic source. Besides, the MPC is combined to make the current track the reference in transients. The proposed control has the ability to suppress the resonance while has a faster dynamic performance comparing with SHEPWM. Finally, the proposed MPC-SHEPWM is tested in a simulation model of CRH5 (Chinese Railway High-speed), EMUs (electric multiple units) and a traction power supply coupled system, which shows that the proposed MPC-SHEPWM approach can achieve the resonance suppression and shows a better dynamic performance.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 2; 415-430
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Farmakologiczna modulacja funkcji i żywotności astrocytów jako nowa strategia neuroprotekcji po niedokrwieniu
    Pharmacological modulation of function and viability of astrocytes as a novel neuroprotective strategy in stroke
    Autorzy:
    Szydłowska, Kinga
    Kamińska, Bożena
    Powiązania:
    https://bibliotekanauki.pl/articles/1197456.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Przyrodników im. Kopernika
    Opis:
    Neuron-astrocyte interactions are critical for signalling, energy metabolism, extracellular ion and glutamate homeostasis, volume regulation and neuroprotection in the central nervous system. Glutamate uptake by astrocytes may prevent excitotoxic glutamate elevation and determine neuronal survival. However, activation of astrogliosis and brain inflammation during cerebral ischemia exacerbates primary brain damage, resulting in upregulation of cytotoxic/infammatory cytokines and mediators, that alter blood flow and increase vascular permeability, thus leading to secondary damage and accumulation of immune cells in the brain. Although, astrocytes are more resistant than neurons to ischemic injury, astrocyte death have been demonstrated in animal models of brain ischemia. Exposure of cultured cortical astrocytes to glutamate induces apoptotic cell death and similar events can be detected in ischemic brain. FK506, an inhibitor of calcineurin and immunosuppressive drug, is neuroprotective in animal models of neurologic diseases, including focal and global ischemia. FK506 exerts a complex action on many processes ongoing in pathological brain: it directly protects neurons from glutamate-induced neuronal cell death, reduces gliosis and brain inflammation in animal models of stroke, and inhibits Glu-induced apoptosis of astrocytes in vitro and in ischemic brain. Altogether, recent findings suggest that modulation of astrocyte functions and astrocytic survival/cell death in neurodegeneration may be a novel therapeutic strategy in neurological disorders.
    Źródło:
    Kosmos; 2008, 57, 3-4; 315-329
    0023-4249
    Pojawia się w:
    Kosmos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new closed loop speed control strategy for a vector controlled three-phase induction motor drive
    Autorzy:
    Tripathi, A.
    Dey, A.
    Dwivedi, B.
    Singh, B.
    Chandra, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/262777.pdf
    Data publikacji:
    2008
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
    Tematy:
    space vector modulation
    VSI
    induction motor model
    transients
    steady state value
    Opis:
    This paper presents a completely mathematical equations based model on control of torque and speed of a three-phase indirect vector controlled VSI fed cage induction motor drive that is controlled through the space vector modulated method. This enables a wide range of acceptability of the model for various values of load and for various types and ratings of induction motors. The uniqueness of the model lies in the fact that the deviations in the torque and speed on sudden application of reference step change in speed values are minimum i.e. when any sudden change in the speed reference is desired, the speed and torque waveforms reveal that the time taken in coming back to their final steady state values is very less and the motor overcomes the perturbation with negligible transients. The same is verified through the simulated results.
    Źródło:
    Electrical Power Quality and Utilisation. Journal; 2008, 14, 1; 67-72
    1896-4672
    Pojawia się w:
    Electrical Power Quality and Utilisation. Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Bidirectional Buck-Boost Converter-Based Switching Ripple Communication Strategy for Intelligent Street Lighting Systems
    Autorzy:
    Zhang, Yixuan
    Hu, Yihua
    Tse, Zion
    Liu, Yuwei
    Deng, Jiamei
    Xu, Hui
    Wang, Yangang
    Li, Wei
    Powiązania:
    https://bibliotekanauki.pl/articles/1955998.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    bidirectional switching ripple communication
    buck-boost converter
    intelligent street lighting system
    pulse width modulation
    smart city
    Opis:
    The light-emitting diode (LED) is an essential component of intelligent street lighting (ISL) systems. An efficient ISL system can not only reduce power consumption by planning LED illuminating time but also reduce maintenance costs through a high degree of automation. In this paper, a buck-boost converter is used to realise composite transmission of power and signals for an ISL system. The power is modulated by the pulse width modulation (PWM) approach, and the switching ripple generated in the PWM process is utilised as the carrier of the signals transmitted between the remote-control centre and the slave nodes. Moreover, the proposed model involves a ‘request to send (RTS)/confirm to send (CTS)’ mechanism to avoid signal conflicts. Compared with the conventional power line communication (PLC) approach, the proposed transmission scheme has the advantages of simple circuit structure and simple system wiring. Additionally, a simulation model built in MATLAB/Simulink proves the designed transmission method has strong anti-noise ability.
    Źródło:
    Power Electronics and Drives; 2021, 6, 41; 260-275
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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