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    Wyświetlanie 1-5 z 5
    Tytuł:
    Frequency control of voltage sourced converter-based multi-terminal direct current interconnected system based on virtual synchronous generator
    Autorzy:
    Li, Congshan
    Zhang, Xiaowei
    He, Ping
    Zhen, Zikai
    Zhao, Kefeng
    Powiązania:
    https://bibliotekanauki.pl/articles/27309962.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    adaptive droop control
    power margin
    VSG
    virtual synchronous generator
    Opis:
    In response to the inability of the flexible DC transmission system connected to the AC grid under conventional control strategies to provide inertia to the system as well as to participate in frequency regulation, a virtual synchronous generator (VSG) control strategy is proposed for a voltage source converter (VSC)-based multi-terminal high-voltage direct current (VSC-MTDC) interconnection system. First, the virtual controller module is designed by coupling AC frequency and active power through virtual inertia control, so that the VSC-MTDC system can provide inertia response for AC grid frequency. Second, by introducing the power margin of the converter station into the droop coefficient, the unbalanced power on the DC side is reasonably allocated to reduce the overshoot of the DC voltage in the regulation process. Finally, the power regulation capability of the normal AC system is used to provide power support to the fault end system, reducing frequency deviations and enabling inter-regional resource complementation. The simulation model of the three-terminal flexible DC grid is built in PSCAD/EMTDC, and the effectiveness of the proposed control strategy is verified by comparing the conventional control strategy and the additional frequency control strategy.
    Źródło:
    Archives of Electrical Engineering; 2023, 72, 4; 971--986
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on communication emitter identification based on semi-supervised dimensionality reduction in complex electromagnetic environment
    Autorzy:
    Ge, Wei
    Qi, Lin
    Tong, Lin
    Zhu, Jun
    Zhang, Jing
    Zhao, Dongyang
    Li, Ke
    Powiązania:
    https://bibliotekanauki.pl/articles/27311449.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    communication emitter identification
    feature extraction
    dimensionality reduction
    VMD
    ESDA
    variational mode decomposition
    exponential semi-supervised discriminant analysis
    identyfikacja emitera komunikacyjnego
    ekstrakcja cech
    redukcja wymiarowości
    rozkład w trybie wariacyjnym
    analiza dyskryminacyjna wykładnicza półnadzorowana
    Opis:
    The individual identification of communication emitters is a process of identifying different emitters based on the radio frequency fingerprint features extracted from the received signals. Due to the inherent non-linearity of the emitter power amplifier, the fingerprints provide distinguishing features for emitter identification. In this study, approximate entropy is introduced into variational mode decomposition, whose features performed in each mode which is decomposed from the reconstructed signal are extracted while the local minimum removal method is used to filter out the noise mode to improve SNR. We proposed a semi-supervised dimensionality reduction method named exponential semi-supervised discriminant analysis in order to reduce the high-dimensional feature vectors of the signals, and LightGBM is applied to build a classifier for communication emitter identification. The experimental results show that the method performs better than the state-of-the-art individual communication emitter identification technology for the steady signal data set of radio stations with the same plant, batch and model.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 4; art. no. e145766
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parameter identification of PMSM based on dung beetle optimization algorithm
    Autorzy:
    Yang, Xiaollang
    Cui, Yuyue
    Jia, Lianhua
    Sun, Zhihong
    Zhang, Peng
    Zhao, Jiane
    Wang, Rui
    Powiązania:
    https://bibliotekanauki.pl/articles/27309956.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    chaotic mapping
    dung beetle algorithm
    Levy flights
    parameter identification
    permanent magnet synchronous motor
    spiral strategy
    Opis:
    In this paper, a creative dung beetle optimization (CDBO) algorithm is proposed and applied to the offline parameter identification of permanent magnet synchronous motors. First, in order to uniformly initialize the population state and increase the population diversity, a strategy to improve the initialization of the dung beetle population using Singer chaotic mapping is proposed to improve the global search performance; second, in order to improve the local search performance and enhance the convergence accuracy of the algorithm, a new dung beetle position update strategy is designed to increase the spatial search range of the algorithm. Simulation results show that the proposed optimization algorithm can quickly and accurately identify parameters such as resistance, inductance, and magnetic chain of the PMSM, with significant improvements in convergence algebra, identification accuracy and stability.
    Źródło:
    Archives of Electrical Engineering; 2023, 72, 4; 1055--1072
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on the removal efficiency of antibiotics in coastal wetlands by Suaeda and Nelumbo nucifera
    Autorzy:
    Ma, Junwen
    Cui, Yubo
    Kuang, Peijing
    Ma, Chengdong
    Zhang, Mingyue
    Chen, Zhaobo
    Zhao, Ke
    Powiązania:
    https://bibliotekanauki.pl/articles/27311559.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    coastal wetlands
    antibiotics
    Suaeda
    Nelumbo nucifera
    phytoremediation
    tereny podmokłe
    tereny przybrzeżne
    antybiotyki
    sodówka
    lotos orzechodajny
    oczyszczanie wody
    biooczyszczanie
    Opis:
    This study mainly focused on the current situation of antibiotic pollution in coastal wetlands by screening for four common antibiotics (norfloxacin – NOR, ofloxacin – OFL, azithromycin – AZM, and roxithromycin – RXM) and two coastal wetland plants (Suaeda and Nelumbo nucifera), to determine the removal of antibiotic pollution by phytoremediation technology and its mechanism. We aimed to provide ideas for the remediation of antibiotics in coastal wetlands and their mechanisms of action in the context of intensive farming. The results showed that both plants had remediation effects on all four antibiotics, the phytoremediation of NOR and OFL was particularly significant, and the remediation effect of N. nucifera was better than that of Suaeda . The removal rates of the four antibiotics by Suaeda and N. nucifera at low antibiotic concentrations (10–25 μg/L) reached 48.9–100% and 77.3–100%, respectively. The removal rates of the four antibiotics at high antibiotic concentrations (50–200 μg/L) reached 7.5–73.2% and 22–84.6%, respectively. Moreover, AZM was only detected in trace amounts in the roots of N. nucifera, and RXM was not detected in either plant body.
    Źródło:
    Archives of Environmental Protection; 2023, 49, 2; 59--65
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification of a linear epitope in the capsid protein of goose astrovirus with monoclonal antibody
    Autorzy:
    Dai, G.
    Huang, X.
    Liu, Q.
    Li, Y.
    Zhang, L.
    Han, K.
    Yang, J.
    Liu, Y.
    Xue, F.
    Zhao, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/16647377.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    epitope
    goose astrovirus
    capsid protein
    monoclonal antibody
    Opis:
    Goose astrovirus (GoAstV) is a novel avastrovirus that typically causes gosling gout and results in 2 to 20% mortality. GoAstV capsid protein is the sole structural protein, which is responsible for viral attachment, assembly, maturation as well as eliciting host antibodies. However, the epitopes within capsid protein have not been well studied. In this study, a monoclonal antibody, named 1D7, was generated against GoAstV capsid protein by hybridoma technology. Western blot results showed that this MAb could react with recombinant capsid protein expressed in E. coli. Also, it recognized the precursor of capsid protein, VP90 and VP70, in GoAstV-infected cells. Besides, excellent specificity of MAb 1D7 was further demonstrated in indirect immunofluorescence assay and immunohistochemical analysis. Epitope mapping results revealed that MAb 1D7 recognized the epitope 33QKVY 36 within Cap protein. Sequence alignment indicated that 33QKVY 36 is a conserved epitope among the isolates of goose astrovirus type 2 (GoAstV-2), suggesting the potential for its use in GoAstV-2 specific diagnostic assay. These findings may provide some insight into a function of the GoAstV capsid protein and further contribute to the development of diagnostic methods for GoAstV infection.
    Źródło:
    Polish Journal of Veterinary Sciences; 2022, 25, 4; 579-587
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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