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    Wyświetlanie 1-6 z 6
    Tytuł:
    Performance Evaluation of BB-QZSI-Based DSTATCOM Under Dynamic Load Condition
    Autorzy:
    Mangaraj, Mrutyunjaya
    Sabat, Jogeswara
    Barisal, Ajit Kumar
    Patra, Anil Kumar
    Chahattaray, Ashok Kumar
    Powiązania:
    https://bibliotekanauki.pl/articles/2175927.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    BB-QZSI
    DSTATCOM
    icos control algorithm
    PUN
    power utility network
    Opis:
    This paper presents the shunt compensation performance of quasi-Z-source inverter (QZSI) and back to back connected QZSIs (BB-QZSI) to address the power quality (PQ) issues in the three-phase three-wire power utility network (PUN). Generally, these PQ issues are poor voltage regulation, low power factor (PF), source current distortion, unbalanced voltage, etc. The proposed BB-QZSI-based distribution static compensator (DSTATCOM) consists of two QZSIs with a common dc-link capacitor. Because the QZSI could achieve buck/boost conversion as well as DC to AC inversion in a single-stage and the back to back configuration decreases the system down time cost (if a fault occurs in one QZSI the other can continue the shunt compensation). Particularly, icosφ control algorithmcontrol algorithm is implemented to generate proper switching pulses for the switches of DSTATCOM. The effectiveness of the BB-QZSI is verified through simulation studies over QZSI using MATLAB/Simulink software satisfying the recommended grid code.
    Źródło:
    Power Electronics and Drives; 2022, 7, 42; 43--55
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    From expected utility theory to prospect theory: tracking down the experimental path after forty years
    Autorzy:
    Kalinowski, Sławomir
    Powiązania:
    https://bibliotekanauki.pl/articles/1181934.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    economic decisions under risk
    expected utility theory
    cumulative prospect theory
    experimental economics
    Opis:
    The expected utility theory axioms have been studied experimentally. Three of the experiments are a repetition of an earlier test in slightly changed circumstances, while the other two are original. The participants were incentivised with rewards, which did not happen in the replicated tests. The results confirmed the degeneration of the expected utility theory as a scientific research program. The evidence that resulted from the tests supported the hypothesis on the cumulative prospect theory predicting facts not forecasted by the EUT.
    Źródło:
    Operations Research and Decisions; 2020, 30, 4; 39-56
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The basis of financial arithmetic from the viewpoint of utility theory
    Autorzy:
    Piasecki, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/406429.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    synergy effect of capital
    diversification
    financial arithmetic
    Gossen’s first law
    utility
    Opis:
    The main goal of this paper is to present a modern axiomatic approach to financial arithmetic. An axiomatic theory of financial arithmetic was first proposed by Peccati, who introduced an axiomatic definition of future value. This theory has been extensively developed in recent years. The proposed approach to financial arithmetic is based on the concept of the utility of a financial flow. This utility function is defined as a linear extension of a multicriterion comparison determined by an individual’s time preference and capital preference. The present value is then defined to be the utility of the financial flow. Therefore, the law of the diminishing marginal utility of wealth has been considered as an additional feature of the present value. The future value is defined as the inverse of the utility function. This definition is a generalization of Peccati’s one. The net present value is given as the unique additive extension of the utility of the financial flow. Moreover, the synergy effect and the diversification effect will be discussed. At the end, the axiomatic definition of the present value will be specified in three ways.
    Źródło:
    Operations Research and Decisions; 2012, 22, 3; 37-53
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The optimization of insurance contracts on the viatical market
    Autorzy:
    Dębicka, Joanna
    Heilpern, Stanisław
    Powiązania:
    https://bibliotekanauki.pl/articles/406657.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    viatical settlement
    multistate model
    Bernoulli principle
    rank dependent expected utility theory
    cumulative prospect theory
    Opis:
    We focus on ensuring the financial requirements of a person that has life insurance and needs money because of suffering from a terminal illness that requires costly diagnosis and treatment. On the secondary market of life insurance (the viatical market), companies offer purchase of rights to benefits after the death of the insured. The paper aims to analyse the problem of optimising the life settlement for the insured. We determine the amount of the nominal value of the benefit which the insured intends to sell in such a way so that the number of benefits and premiums maximise the average amount of funds available to the insured. We use various approaches of the insured to risk to find an optimal solution, which also allows taking into consideration the different kinds of human behaviour in risky conditions. The obtained theoretical results are illustrated with examples demonstrating the possibility of their application in practice.
    Źródło:
    Operations Research and Decisions; 2020, 30, 2; 5-27
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Control of a Four-wire Hybrid Prosumer Converter for Balancing Utility Grids
    Autorzy:
    Kwaśny, Łukasz
    Zieliński, Dariusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1955973.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    control of 4-wire converter
    utility grid balancing
    prosumer generation
    hybrid PV converter
    energy storage
    Opis:
    The paper presents the project of the power electronic AC/DC converter operating under a multiresonant control algorithm for prosumer applications. This design allows independent control of active and reactive power for any or each phase. Both the converter and its algorithm are based on a three-phase converter of four-wire topology (AC/DC 3p-4w) with a DC bus, which couple the converter to a renewable energy source and energy storage. Further, model and simulation tests were carried out in the Matlab-SIMULINK programming environment. The results obtained indicate that operation with deep unbalances and powers of opposite signs in individual phases results in current variations (oscillations) in the DC line, which is a significant limitation, and it can be concluded that the level of asymmetry should be limited to the level acceptable to the energy storage device.
    Źródło:
    Power Electronics and Drives; 2021, 6, 41; 1-11
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic olfactometry and modelling as methods for the assessment of odour impact of public utility objects
    Autorzy:
    Sówka, I.
    Miller, U.
    Sobczyński, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/207162.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    odour emissions
    emission sources
    public utility objects
    olfactometry
    emisja odorów
    stężenie zapachowe
    obiekty użyteczności publicznej
    olfaktometr
    Opis:
    The methods used to the identification of odour concentrations from public utility objects, under Polish legal regulations have been presented with exemplary results of measurements by the dynamic olfactometry and model calculations. The results of the study indicate the usefulness of the dynamic olfactometry in determining odour concentrations (from point and area emission sources located in public utility objects) suitable in odour emissions calculations. Based on results of such calculations, it is possible to determine odour concentrations in the receptor points and to evaluate olfactory impact range of considered objects, taking into account all types of odour sources affecting the quality of air in the area under study. Selected methods – as an alternative to field research: measurements in the grid and in the plume – can be less time and cost consuming but also require careful planning the number of samples and proper selection of representative sampling areas, especially in the case of the area sources.
    Źródło:
    Environment Protection Engineering; 2016, 42, 3; 143-152
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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