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    Wyświetlanie 1-11 z 11
    Tytuł:
    Identification and Estimation of Initial Conditions in Non-Minimal State-Space Models
    Autorzy:
    Bystrov, Victor
    Powiązania:
    https://bibliotekanauki.pl/articles/2075239.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    identification
    latent variables
    state-space model
    redundancy
    Opis:
    In this paper the identification problem is considered for initial conditions in a non-minimal state-space model that includes interpretable state variables generated by non-stationary stochastic processes. In order to solve the identification problem, structural restrictions are imposed on initial conditions in a state-space model with redundant state variables. The corresponding restricted maximum likelihood estimator of initial conditions is derived. The restricted estimator of initial conditions can be used in order to compute uniquely identified realizations of interpretable latent variables. The identification problem is illustrated analytically using a simple structural economic model
    Źródło:
    Central European Journal of Economic Modelling and Econometrics; 2020, 4; 413-429
    2080-0886
    2080-119X
    Pojawia się w:
    Central European Journal of Economic Modelling and Econometrics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Generalized state space model and small signal stability analysis of Z-source converter
    Autorzy:
    Kouhanjani, Masoud Jokar
    Soltani, Sina
    Mardaneh, Mohammad
    Powiązania:
    https://bibliotekanauki.pl/articles/2202552.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    small signal stability
    state space model
    Z-source converter
    Opis:
    This paper proposes two nonlinear exact and simple state space models of a Zsource converter (ZSC) connected to an ac grid. A generic model of a ZSC accompanied with proper controllers are proposed and a dynamic model of the whole system is derived; as a result, based on a simple one, an equivalent block diagram of the current-controlled ZSC system is proposed. The ac small signal stability method is applied and the impact of controller parameters on network’s stability is discussed. Besides, overall system dynamic performance has been assessed in the event of perturbations. Time-domain simulations have been implemented in PSCAD/EMTDC to validate the accuracy of the models and effectiveness of the proposed controllers. The results of the exact model are compared with the response of the equations which are applied in MATLAB.
    Źródło:
    Archives of Electrical Engineering; 2023, 72, 1; 173--188
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Using VARs and TVP-VARs with Many Macroeconomic Variables
    Autorzy:
    Koop, Gary
    Powiązania:
    https://bibliotekanauki.pl/articles/483265.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Bayesian VAR
    forecasting
    time-varying coefficients
    state-space model
    Opis:
    This paper discusses the challenges faced by the empirical macroeconomist and methods for surmounting them. These challenges arise due to the fact that macroeconometric models potentially include a large number of variables and allow for time variation in parameters. These considerations lead to models which have a large number of parameters to estimate relative to the number of observations. A wide range of approaches are surveyed which aim to overcome the resulting problems. We stress the related themes of prior shrinkage, model averaging and model selection. Subsequently, we consider a particular modelling approach in detail. This involves the use of dynamic model selection methods with large TVP-VARs. A forecasting exercise involving a large US macroeconomic data set illustrates the practicality and empirical success of our approach.
    Źródło:
    Central European Journal of Economic Modelling and Econometrics; 2012, 4, 3; 143-167
    2080-0886
    2080-119X
    Pojawia się w:
    Central European Journal of Economic Modelling and Econometrics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Offset-free nonlinear Model Predictive Control with state-space process models
    Autorzy:
    Tatjewski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/229638.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nonlinear control
    predictive control
    offset-free control
    state-space model
    state estimation
    Opis:
    Offset-free model predictive control (MPC) algorithms for nonlinear state-space process models, with modeling errors and under asymptotically constant external disturbances, is the subject of the paper. The main result of the paper is the presentation of a novel technique based on constant state disturbance prediction. It was introduced originally by the author for linear state-space models and is generalized to the nonlinear case in the paper. First the case with measured state is considered, in this case the technique allows to avoid disturbance estimation at all. For the cases with process outputs measured only and thus the necessity of state estimation, the technique allows the process state estimation only - as opposed to conventional approach of extended process-and-disturbance state estimation. This leads to simpler design with state observer/filter of lower order and, moreover, without the need of a decision of disturbance placement in the model (under certain restrictions), as in the conventional approach. A theoretical analysis of the proposed algorithm is provided, under applicability conditions which are weaker than in the conventional approach. The presented theory is illustrated by simulation results of nonlinear processes, showing competitiveness of the proposed algorithms.
    Źródło:
    Archives of Control Sciences; 2017, 27, 4; 595-615
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling and simulation aspects of AC machines
    Autorzy:
    Popp, M.
    Laza, P.
    Mathis, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/141659.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    State Space Modeling
    AC Machines
    ODE and DAE Solvers
    MATLAB
    Opis:
    In the field of power and drive systems, electrical AC machines are mostly modeled using a set of explicit ordinary differential equations in a state space representation. It is shown, that by using other equation types for simulation, algebraic constraints arising from aggregating several machines to a more complex system can directly be considered. The effects of different model variants on numerical ODE/DAE solvers are investigated in the focus of this work in order perform efficient simulations of larger systems possessing electrical AC machines.
    Źródło:
    Archives of Electrical Engineering; 2016, 65, 2; 315-326
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Positive realizations with reduced numbers of delays for 2D continuous-discrete linear systems
    Autorzy:
    Kaczorek, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/201699.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    computation
    linear
    2D continuous-discrete
    delay
    state-space realization
    sufficient conditions
    Opis:
    A new method is proposed for determination of positive realizations with reduced numbers of delays of linear 2D continuousdiscrete systems. Sufficient conditions for the existence of the positive realizations of a given proper transfer function are established. It is shown that there exists a positive realization with reduced numbers of delays if there exists a positive realization without delays but with a greater dimension. The proposed method is demonstrated on a numerical example.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 4; 835-840
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measuring the Natural Rates of Interest in Germany and Italy
    Autorzy:
    Bystrov, Victor
    Powiązania:
    https://bibliotekanauki.pl/articles/2076225.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    natural rate of interest
    potential output
    euro area
    state-space model
    Kalman filter
    Opis:
    In this paper a semi-structural econometric model is implemented in order to estimate the natural rates of interest in two large economies of the Euro Area: Germany an Italy. The estimates suggest that after the financial crisis of 2007–2008 a decrease of the growth rate of potential output and the corresponding natural rate of interest was greater in Italy than in Germany which could have had important implications for the effectiveness of a common monetary policy. Unlike in other studies, it is found that the monetary policy stance was less expansionary in Italy as compared to Germany for the whole after-crisis period.
    Źródło:
    Central European Journal of Economic Modelling and Econometrics; 2018, 4; 333-353
    2080-0886
    2080-119X
    Pojawia się w:
    Central European Journal of Economic Modelling and Econometrics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Autocovariance and Linear Transformations of Markov Switching VARMA Processes
    Autorzy:
    Cavicchioli, Maddalena
    Powiązania:
    https://bibliotekanauki.pl/articles/2076570.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    time series
    multivariate ARMA
    state-space models
    Markovchains
    changes in regime
    autocovariance
    linear representations
    Opis:
    We study the autocovariance structure of a general Markov switching second-order stationary VARMA model. Then we give stable finite order VARMA(p∗, q∗) representations for those M-state Markov switching VARMA(p, q) processes where the observables are uncorrelated with the regime variables. This allows us to obtain sharper bounds for p∗and q∗ with respect to the ones existing in literature. Our results provide new insights into stochastic properties and facilitate statistical inference about the orders of MS-VARMA models and the underlying number of hidden states
    Źródło:
    Central European Journal of Economic Modelling and Econometrics; 2014, 4; 275-289
    2080-0886
    2080-119X
    Pojawia się w:
    Central European Journal of Economic Modelling and Econometrics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    State - space control of the drive with PMSM and flexible coupling
    Układ sterowania napędu z PMSM i elastycznym sprzęgłem
    Autorzy:
    Vittek, J.
    Makys, P.
    Pospisil, M.
    Szychta, E.
    Luft, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/224343.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    układ sterowania
    algorytm sterowania
    sprzęgło elastyczne
    control systems
    control vector algorithm
    state-space control
    Opis:
    A control system, which achieves prescribed speed and position responses, for electric drives with a significant torsion vibration mode is presented. Control system design exploits state-space control and forced dynamics control principles. Derived control algorithm respects the vector control condition by keeping the direct axis current component approximately zero as well as controlling the load position with prescribed closed loop dynamics. Set of two observers, one on load side and the second one on motor side, generate all state variables necessary for control algorithm design including torques acting on the motor and load side to satisfy all conditions for achieving prescribed dynamics. This approach eliminates the position sensor on motor side. The simulations confirm that proposed model based position control system can operate with moderate accuracy.
    W artykule zaprezentowano układ sterowania napędami elektrycznymi ze znacznymi drganiami skrętnymi, który umożliwia jako odpowiedzi - określone obroty i położenie. Układ sterowania wykorzystuje opis przestrzeni stanu i zasady wymuszonego sterowania dynamicznego. Zestaw dwóch obserwatorów, jeden po stronie obciążenia, a drugi od strony silnika, wygenerować może wszystkie zmienne stanu niezbędne do projektowania algorytmu sterowania, w tym momenty działające po stronie silnika i obciążenia, spełniające wszystkie warunki niezbędne do osiągnięcia określonej dynamiki. Takie podejście eliminuje stosowanie czujnika położenia od strony silnika. Wyniki symulacji potwierdzają, że proponowany model układu sterowania położenia może pracować z wystarczającą dokładnością.
    Źródło:
    Archives of Transport; 2011, 23, 1; 77-90
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    State Space-Based Method for the DOA Estimation by the Forward-Backward Data Matrix Using Small Snapshots
    Autorzy:
    Liu, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/227085.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    state space-based method
    DOA estimation
    small snapshots
    array signal
    antenna elements
    forward-backward data Matrix
    Opis:
    In this presentation, a new low computational burden method for the direction of arrival (DOA) estimation from noisy signal using small snapshots is presented. The approach introduces State Space-based Method (SSM) to represent the received array signal, and uses small snapshots directly to form the Hankel data matrix. Those Hankel data matrices are then utilized to construct forward-backward data matrix that is used to estimate the state space model parameters from which the DOA of the incident signals can be extracted. In contrast to existing methods, such as MUSIC, Root-MUSIC that use the covariance data matrix to estimate the DOA and the sparse representation (SR) based DOA which is obtained by solving the sparsest representation of the snapshots, the SSM algorithm employs forward-backward data matrix formed only using small snapshots and doesn't need additional spatial smoothing method to process coherent signals. Three numerical experiments are employed to compare the performance among the SSM, Root-MUSIC and SR-based method as well as Cramér–Rao bound (CRB). The simulation results demonstrate that when a small number of snapshots, even a single one, are used, the SSM always performs better than the other two method no matter under the circumstance of uncorrelated or correlated signal. The simulation results also show that the computational burden is reduced significantly and the number of antenna elements is saved greatly.
    Źródło:
    International Journal of Electronics and Telecommunications; 2017, 63, 3; 315-322
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structured Mapping of Petri Net States and Events for FPGA Implementations
    Autorzy:
    Tkacz, J.
    Adamski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/227222.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    configurable logic controllers
    interpreted Petri net state space
    local and global state encoding
    hyperpgraph
    logic design
    Gentzen sequents
    Petri net coloring
    FPGA
    VHDL
    Opis:
    The paper presents a new method of structured encoding of global internal states and events in Reconfigurable Logic Controllers, which are directly mapped into Field Programmable Gate Arrays (FPGA). Modular, concurrently decomposed, colored state machine is chosen as a intermediate model, before the mapping of Petri net into an array structure of dedicated but very flexible and reliable digital system. The initial textual specification in formal Gentzen logic serves both as a design description for a rapid prototyping, as well as formal model, suitable for detailed computer-based reasoning about optimized and synthesized logic controller, implemented in configurable hardware. Only the selected linear subset from general, universal propositional Gentzen Logic is necessary to deduce several properties of the net, such as relations of nonconcurrency among structurally ordered macroplaces. The goal of this paper is to present the design methodology for modeling and synthesis of discrete controllers using related Petri net theory, rule-based theory (mathematical logic), and VHDL.
    Źródło:
    International Journal of Electronics and Telecommunications; 2013, 59, 4; 331-339
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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