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    Wyświetlanie 1-7 z 7
    Tytuł:
    Recovery braking of variable-structure electronic commutator for BLDC motor
    Autorzy:
    Biskup, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/140812.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    power electronics
    BLDC motor
    electronic commutator
    electric vehicle
    Opis:
    Permanent magnet motors are more and more frequently used in various applications. In this group motors with a trapezoidal EMF deserve a special attention. They are characterized by a simple construction, high efficiency and high torque overload. A certain drawback of BLDC motors are difficulties with an operation at a speed above the nominal value. The article presents the results of investigations into the variablestructure electronic commutator designed for the drive of a small electric vehicle equipped with BLDC motors. Such a solution allows extending the standard range of the drive's speed. The considerations contained in the article focus on the possibilities and effects of regeneration mode in the proposed topology of converter. A theoretical analysis has been presented as well as computer simulations carried out by means of Matlab- Simulink, which were then verified at a laboratory. The tests were finished with trias conducted using a small electric vehicle Elipsa.
    Źródło:
    Archives of Electrical Engineering; 2012, 61, 4; 579-596
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurement-based harmonic current modeling of mobile storage for power quality study in the distribution system
    Autorzy:
    Wenge, C.
    Guo, H.
    Roehrig, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/140847.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electrical vehicle
    harmonic load modeling
    harmonic measurement in power system
    power quality
    power system harmonics
    Opis:
    Electric vehicles (EVs) can be utilized as mobile storages in a power system. The use of battery chargers can cause current harmonics in the supplied AC system. In order to analyze the impact of different EVs with regardto their number and their emission of current harmonics, a generic harmonic current model of EV types was built and implemented in the power system simulation tool PSS®NETOMAC. Based on the measurement data for different types of EVs three standardized harmonic EV models were developed and parametrized. Further, the identified harmonic models are used by the computation of load flow in a modeled, German power distribution system. As a benchmark, a case scenario was studied regarding a high market penetration of EVs in the year 2030 for Germany. The impact of the EV charging on the power distribution system was analyzed and evaluated with valid power quality standards.
    Źródło:
    Archives of Electrical Engineering; 2017, 66, 4; 801-814
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of electric vehicle charging rates on transformer derating in harmonic-rich battery charger applications
    Autorzy:
    Jouybari-Moghaddam, M.
    Alimardani, A.
    Hosseinian, S.H.
    Powiązania:
    https://bibliotekanauki.pl/articles/140829.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electric vehicle charging
    charging rate
    power quality
    stochastic modeling
    transformer derating
    Opis:
    A study on plug-in electric vehicle (PEV) charging load and its impacts on distribution transformers loss-of-life, is presented in this paper. The assessment is based on residential PEV battery charging. As the exact forecasting of the charging load is not possible, the method for predicting the electric vehicle (EV) charging load is stochastically formulated. With the help of the stochastic model, the effect of fixed, time of use, and real-time charging rates on the charging load and the resultant impact on transformer derating is investigated. A 38-bus test system is adopted as the test system including industrial harmonic sources. Test results demonstrate that uncontrolled EV charging might causes a noticeable change in the K-factor of the transformer, emerging the need for derating, while applying real-time rates for battery charging loads conquers this problem even in case of harmonic-rich chargers.
    Źródło:
    Archives of Electrical Engineering; 2012, 61, 4; 483-497
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comprehensive forecast of electromobility mid-term development in Poland and its impacts on power system demand
    Autorzy:
    Piotrowski, P.
    Baczyński, D.
    Robak, S.
    Kopyt, M.
    Piekarz, M.
    Polewaczyk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/200741.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mid-term forecast
    electromobility
    electric vehicle (EV)
    power system demand
    load profile
    Opis:
    This paper discusses three variants of how e-mobility development will affect the Polish Power System. Multivariate forecasts of annual new registrations of electric vehicles for up to seven years are developed. The forecasts use the direct trend trend extrapolation methods,methods based on the deterministic chaos theory, multiple regression models, and the Grey model. The number of electric vehicles in use was determined for 2019‒2025 based on the forecast new registrations. The forecasts were conducted in three variants for the annual electric energy demand in 2019‒2025, using the forecast number of electric vehicles and the forecast annual demand for electric energy excluding e-mobility. Forecasts were conducted in three variants for the daily load profile of power system for winter and summer seasons in the Polish Power system in 2019–2025 based on three variants of the forecast number of electric vehicles and forecast relative daily load profiles.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 4; 697-709
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An example of a power-off maneuver of a vehicle without a straight line motion control
    Autorzy:
    Kisilowski, Jerzy
    Zalewski, Jarosław
    Powiązania:
    https://bibliotekanauki.pl/articles/1832920.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    vehicle dynamics
    power-off
    no motion control
    motion control
    dynamika pojazdu
    wyłączanie
    brak kontroli ruchu
    kontrola ruchu
    Opis:
    In this paper some selected results related to motor vehicle dynamics have been presented basing on the computer simulations of a sports two-seater performing a power-off straight line maneuver with different road conditions and the lack of a straightline motion control having been included. All simulations have been performed in the MSC Adams/Car environment and the adopted maneuver was performed at the instant speed of 100km/h-1. The selected phenomena have therefore been observed along the road long enough to relate them to different aspects of vehicle dynamics and the road traffic safety research. The adopted vehicle’s model moved along the flat and the randomly uneven road with the almost similar and the almost different profiles for the left and the right wheels. Additionally, two values of the coefficient determining the maxi-mum amplitude of road irregularities have been selected, i.e., 0.3 for the lower and 0.9 for the higher irregularities. This meant that the road conditions have been considered as one of the main factors possibly affecting disturbances of the motor vehicle’s motion. Such research seems valuable from the point of view of the road safety and the vehicles’ maintenance. A power-off straight maneuver is not very often performed during the normal road traffic and might seem useless. However, in this case it seemed essential to test the response of a vehicle’s model to such factors as, e.g., the uneven loading, suspension characteristics, etc. This in turn might prove valuable when considering, e.g., the additional concentration of a driver to overcome the external disturbances acting on a moving vehicle. The presented research is the second part of the paper (Kisilowski, 2019) where the power-off maneuver was considered but with the straightforward motion control. Here, the straight-line control has been switched off to examine an untypical situation where, for example a driver loses consciousness, and the vehicle moves freely along the road.
    Źródło:
    Archives of Transport; 2021, 58, 2; 63-80
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A self-scheduling strategy of virtual power plant with electric vehicles considering margin indexes
    Autorzy:
    Jiao, Fengshun
    Deng, Yongsheng
    Li, Duo
    Wei, Bo
    Yue, Chengyan
    Cheng, Meng
    Zhang, Yapeng
    Zhang, Jiarui
    Powiązania:
    https://bibliotekanauki.pl/articles/949880.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electric vehicle (EV)
    response time margin (RTM)
    scheduling strategy
    state of charge margin (SOCM)
    virtual power plant (VPP)
    Opis:
    From the perspective of a virtual power plant (VPP) with electric vehicles (EVs), a self-scheduling strategy considering the response time margin (RTM) and state of charge margin (SOCM) is proposed. Firstly, considering the response state of the state of charge (SOC) and charge-discharge state of EVs, a VPP based response capacity determination model of EVs is established. Then, RTM and SOCM indexes are introduced on the basis of the power system scheduling target and the EV users’ traveling demands. The RTM and SOCM indices are calculated and then are used to generate a priority sequence of responsive EVs for the VPP. In the process of the scheduling period and rolling iteration, the scheduling schemes of the EVs in the VPP for multiple time periods are determined. Finally, the VPP self-scheduling strategy is validated by taking an VPP containing three kinds of EV users as an example. Simulation results show that with the proposed strategy, the VPP is able to respond to the scheduling power from the power system, while ensuring the traveling demands of the EV users at the same time.
    Źródło:
    Archives of Electrical Engineering; 2020, 69, 4; 907-920
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selected aspects of motor vehicle dynamics on the example of a power-off straight line maneuver
    Autorzy:
    Kisilowski, Jerzy
    Zalewski, Jarosław
    Powiązania:
    https://bibliotekanauki.pl/articles/224116.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    motor vehicle dynamics
    power-off
    straight line maneuver
    traffic safety
    dynamika pojazdu samochodowego
    wyłączenie zasilania
    manewry po prostej
    bezpieczeństwo ruchu
    Opis:
    In this paper the selected phenomena related to motor vehicle’s motion have been considered basing on a computer simulation. The vehicle performed a power-off straight line maneuver with different road conditions being included. All simulations have been performed in the MSC Adams/Car environment based on the available sports two-seater vehicle model, realizing the adopted maneuver at the instant speed of 100km/h. This enabled observation of the selected phenomena along the road long enough to relate them to different aspects of vehicle dynamics research. As for the randomly uneven road, almost similar and almost different profiles have been assumed for the left and right wheels of the vehicle. Additionally, two values of the coefficient determining the maximum amplitude of road irregularities have been selected: 0.3 for lower and 0.9 for higher irregularities, so the road surface conditions along with the flat road have been considered as one of the factors causing disturbances of the motor vehicle motion. Such research seems valuable from the point of view of road traffic safety and vehicle maintenance. This specific example is a presentation of the possible research on vehicle dynamics as well as a potential background for further considerations including different types of vehicles along with almost different road profiles for the left and right wheels of the given vehicle model. A power-off straight maneuver is not performed very often in normal road traffic. However, such test could be valuable when analyzing influence of the selected motor vehicle parameters, such as uneven loading, suspension characteristics, etc. on such maintenance features as stability, steerability and the influence of external disturbances acting on the moving vehicle. Further research provides different maneuvers and different simulation conditions.
    Źródło:
    Archives of Transport; 2019, 50, 2; 57-76
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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