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    Wyświetlanie 1-3 z 3
    Tytuł:
    Research on optimal configuration of fault current limiter based on reliability in large power network
    Autorzy:
    Zeng, Jianjun
    Zhang, Yonggao
    Powiązania:
    https://bibliotekanauki.pl/articles/949918.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    configuration optimization
    fault current limiter
    reliability
    short circuit current
    Opis:
    With the availability of UHV engineering technology, the scale of the power network is expanding, and the level of the short-circuit current is getting higher, which brings hidden trouble to the safe and stable operation of the power network. Further this article issued a method that optimized the configuration of a current limiter based on the reliability of the power network. According to the reliability analysis under the influence of a short circuit, the quantitative evaluation of reliability of the power network is realized by the calculation of the short-circuit current. A quantitative model is established among reliability evaluation and the short-circuit current as well as load loss, the candidate installation site of a current limiter can be determined according to reliability quantification results. This method uses the particle swarm optimization algorithm to optimize the distribution of the limiter, aiming at the reliability level and the minimum number of current limiters in the short circuit of a power grid. Finally, taking the actual power grid of a province as an example, the result shows that this method can reduce the search space of the optimal solution, optimize the configuration of the current limiter, and effectively limit the short-circuit current and improve the reliability of the power network.
    Źródło:
    Archives of Electrical Engineering; 2020, 69, 3; 661-677
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computation of electromagnetic forces in the windings of amorphous core transformers
    Autorzy:
    Thanh, Bao Doan
    Tung, Doan Duc
    Le, Tuan-Ho
    Powiązania:
    https://bibliotekanauki.pl/articles/24202732.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    amorphous transformer
    electromagnetic force
    leakage flux
    magnetic vector potential formulation
    short-circuit current
    Opis:
    Electromagnetic forces generated by the short circuit current and leakage flux in low- and high-voltage windings of distribution transformers as well as amorphous core transformers will cause the translation, destruction, and explosion of the windings. Thus, the investigation of these forces plays a significant role for researchers and manufacturers. Many authors have recently used the finite element method to analyze electromagnetic forces. In this paper, an analytic model is first developed for magnetic vector potential formulations to compute the electromagnetic forces (i.e., axial and radial forces) acting on the low- and high-voltage windings of an amorphous core transformer. The finite element technique is then presented to validate the results obtained from the analytical model. The developed model is applied to an actual problem.
    Źródło:
    Archives of Electrical Engineering; 2023, 72, 2; 521--539
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A control method of fault current in MT-HVDC grid based on current limiter and circuit breaker
    Autorzy:
    Wang, Sihua
    Zhao, Lei
    Zhou, Lijun
    Powiązania:
    https://bibliotekanauki.pl/articles/1955197.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bipolar short circuit
    fault current limiting
    hybrid DC circuit breaker
    ultiterminal HVDC grid
    zwarcie bipolarne
    ograniczanie prądu zwarciowego
    hybrydowy wyłącznik prądu stałego
    ultraliniowa sieć HVDC
    Opis:
    In order to realize selective isolation of fault lines in multi-terminal high voltage DC (MT-HVDC) grids, it is necessary to ensure that the sound lines can still transmit power normally after the grounding fault occurs in a DC power network. If the fault line needs to be cut before the converter is blocked, a DC circuit breaker (DCCB) with large switching capacity is often required. At present, the extreme fault over-current and the high cost of DCCBs have become the prominent contradiction in MT-HVDC projects. Reducing the breaking stress of power electronic devices of the circuit breaker and controlling its cutting-off time are the major difficulties in this research field. In this paper, a topology of a hybrid DCCB with an inductive current limiting device is proposed. By analyzing its working principle, the calculation method of key parameters is given, and a four-terminal HVDC grid is built in a PSCAD/EMTDC platform for fault simulation. The results show that compared with the traditional circuit breaker, this topology can effectively limit the rising speed and maximum current of fault current when the system fails, and quickly remove the fault line, so as to meet the suppression requirement of the HVDC system for fault current.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 4; 907-923
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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