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Wyświetlanie 1-10 z 87
Tytuł:
Modeling and analysis of 12-pulse inverter in shipboard or aircraft
Autorzy:
Che, Y.
Zhou, J.
Liu, G.
Xu, J.
Zhao, Y.
Powiązania:
https://bibliotekanauki.pl/articles/260236.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
generalized state space averaging (GSSA)
state space averaging (SSA)
MATLAB
Opis:
With the development of DC distribution system within the isolated power system of a ship or an aircraft, more constant frequency loads will be supplied by inverters connected to DC main bus. In the operating mode conversion process of an isolated power system, inverters will inevitably suffer from serious disturbance and affect the stability of the system. Therefore, it is important to establish a model of the inverter that reflects its dynamic characteristics and based on which to conduct the stability analysis. This paper proposes a 12-pulse inverter model based on the generalized state space averaging (GSSA) method. This model can overcome the limitations of 12-pulse inverter state space averaging (SSA) model in transient analysis with good accuracy and fast analysis ability effectively. Three kinds of models for a 12-pulse aircraft inverter are built in MATLAB, namely GSSA model, SSA model and detail device model. The simulation results show the high accuracy of GSSA model in stability analysis. This study provides an effective analytical tool for stability analysis of 12-pulse inverter and also provides a reference for inverter modeling research of isolated power system such as in aircraft or ship.
Źródło:
Polish Maritime Research; 2017, S 3; 136-142
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The peculiarities of Space State Information Policy
Autorzy:
Rzhevska, Nina
Feshchenko, Anastasia
Powiązania:
https://bibliotekanauki.pl/articles/2137395.pdf
Data publikacji:
2022
Wydawca:
Państwowa Wyższa Szkoła Zawodowa w Chełmie
Tematy:
information policy
space state
space industry
information society
national information policy
information infrastructure
information resources
Opis:
The purpose of the article is to establish and research the features of space state information policy, which requires the following research tasks to be revealed: to determine the place and role of information policy in the structure of state policy and to establish the dependence of the state's information policy on the development of the space industry and to determine the features of the information policy of the USA as a space state. The USA forms its information policy based on knowledge of the use of advanced technologies, including information technologies, in the space industry. Knowing about the threats of their use, the state warns the population by regulating information activities. Therefore, the information policy of a space state is more developed than that of non-space states. An analysis of the relationship between the state of information policy and the state of the US space industry indicates that the development of one area aects the other. Therefore, in order to implement an eective information policy, both areas should be developed.
Źródło:
Language. Culture. Politics. International Journal; 2022, 1; 247-264
2450-3576
2719-3217
Pojawia się w:
Language. Culture. Politics. International Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
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:
Addressing the problem of lack of representativeness on syndromic surveillance schemes
Autorzy:
Natário, Isabel
Lucília Carvalho, M.
Powiązania:
https://bibliotekanauki.pl/articles/729974.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
syndromic surveillance
state space models
importance sampling
Opis:
A major concern with some contagious diseases has recently led to an enormous effort to monitor population health status by several different means.
This work presents a modeling approach to overcome this poor data characteristic, allowing its use for the estimation of the true population disease picture. We use a state space model, where we run two processes in parallel - a process describing the non observable states of the population concerning the presence/absence of disease, and an observational process resulting from the monitoring.
We then use resampling importance sampling estimation techniques, in a Bayesian framework, which enables us to estimate the population states and, thus, the corresponding disease incidence curves.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2009, 29, 2; 169-183
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Towards a target employment rate within age and gender groups
Autorzy:
Jaworski, Stanisław
Zielińska-Kolasińska, Zofia
Powiązania:
https://bibliotekanauki.pl/articles/1917017.pdf
Data publikacji:
2021-12-08
Wydawca:
Główny Urząd Statystyczny
Tematy:
employment rate
exponential smoothing
forecasting
state space approach
Opis:
Quarterly employment rates in European countries are analysed in terms of the likelihood of achieving a specific employment rate within age and gender groups in a five-year horizon. The German employment rate serves as a benchmark for this research. The likelihood is estimated by a Monte-Carlo simulation based on the class of exponential smoothing models. The research presents a pessimistic prognosis of employment rates in European countries with respect to young and partly to older workers.
Źródło:
Statistics in Transition new series; 2021, 22, 4; 213-225
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Equivalence of control systems on the Euclidean group SE (2)
Autorzy:
Adams, R. M.
Biggs, R.
Remsing, C. C.
Powiązania:
https://bibliotekanauki.pl/articles/205696.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
Left-invariant control system
state space equivalence
Euclidean group
Opis:
We classify, under (local) state space equivalence, all full-rank left-invariant control affne systems evolving on the Euclidean group SE(2).
Źródło:
Control and Cybernetics; 2012, 41, 3; 513-524
0324-8569
Pojawia się w:
Control and Cybernetics
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:
The observational equivalence of natural and unnatural rates of interest
Autorzy:
Bystrov, Victor
Powiązania:
https://bibliotekanauki.pl/articles/1046640.pdf
Data publikacji:
2020
Wydawca:
Główny Urząd Statystyczny
Tematy:
natural rate of interest
state-space model
observational equivalence
Opis:
The results of the study presented in this paper demonstrate that a structural model of the natural interest rate, which is consistent with the standard assumptions of the natural rate theory, admits an interpretable, observationally equivalent representation in which a redefined, 'unnatural' equilibrium rate is different from the natural rate in the original model. The alternative representation was obtained by an invertible transformation implemented in the minimal state-space form of the natural-rate model. The identification theory for state-space models is used in the paper to prove the observational equivalence of these two representations. In the alternative representation, the equilibrium interest rate fails to meet the assumption of the natural rate theory, because it depends on past demand shocks. The alternative model, being observationally equivalent, has different implications for the conduct of monetary policy. The problem of observational equivalence arises in relation to natural-rate models because of the inherent unobservability of the natural interest rate; a potential solution to this problem could be the augmentation of the information set which is used to identify and estimate the natural rate.
Źródło:
Przegląd Statystyczny; 2019, 66, 3; 183-199
0033-2372
Pojawia się w:
Przegląd Statystyczny
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
Wyświetlanie 1-10 z 87

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