Serwis Infona wykorzystuje pliki cookies (ciasteczka). Są to wartości tekstowe, zapamiętywane przez przeglądarkę na urządzeniu użytkownika. Nasz serwis ma dostęp do tych wartości oraz wykorzystuje je do zapamiętania danych dotyczących użytkownika, takich jak np. ustawienia (typu widok ekranu, wybór języka interfejsu), zapamiętanie zalogowania. Korzystanie z serwisu Infona oznacza zgodę na zapis informacji i ich wykorzystanie dla celów korzytania z serwisu. Więcej informacji można znaleźć w Polityce prywatności oraz Regulaminie serwisu. Zamknięcie tego okienka potwierdza zapoznanie się z informacją o plikach cookies, akceptację polityki prywatności i regulaminu oraz sposobu wykorzystywania plików cookies w serwisie. Możesz zmienić ustawienia obsługi cookies w swojej przeglądarce.
The paper presents some considerations regarding the problematic of asynchronous generator's (AG) excitation. There are presented some theoretical considerations regarding the efficiency of the capacitive excited asynchronous generator compounding regarding the load voltage variation compensation. There is presented the determination of the compounding condenser's capacity by using the graph-analytical...
This paper presents considerations of using wireless sensor networks for monitoring conditions within wind farms, taking into considerations the specific of such applications. In these scenarios, which are intended to cover a lot of ground or even operate in difficult radio environments with strong attenuation, the simple and direct communication between source and destination is not always possible,...
This paper presents a self-tuning adaptive control structure designed through the minimization of a criteria function. It is described the computation methodology of the control law, being particularized for the case of a dual winding induction generator's excitation control. The parameter's estimator, integrated into the control system, is based on the on-line least mean square error algorithm. In...
There were conceived original methods that intend to optimize (maximize) the efficiency of variable speed fixed blade wind generators. These methods are based on mathematical models of fixed blades wind turbines windmills. This is the main reason that an important part of the paper is dedicated to the problematic of mathematical modeling of the wind turbine - focused mainly on the determination from...
This paper presents the implementation of a neural network-based fault detection for wireless sensor networks (WSNs). There are discussed two proposed approaches: both a centralized and respectively distributed fault detection. The methods are validated using a wireless sensor network that takes environmental measurements every 60 seconds. There were considered various fault scenarios that were detected...
The paper presents some issues regarding an online tuning procedure for a recursive last mean square (RLMS) parameter estimator embedded into an adaptive controller used to control the terminal voltage of a synchronous generator. The analysis is mainly focused on the problematic regarding the reinitialization of the covariance matrix within the RLMS algorithm. A study case for a dynamical model, with...
The paper concerns a dual (double) split-wound three-phase stator windings induction generator having the same poles number (split-wound). The separate stator windings have distinct functions — excitation and, respectively, electric energy generation, that assures the physical decoupling of the excitation and of the load and their control simplification, There was considered [1] 90 electrical degrees...
The last decade's research has highlighted the necessity of using of wind aggregates' at full capacity, fact that involves the functioning at a imposed precise value of rotation and torque at certain wind speed values (on the maximum power point located on the wind turbine characteristic). The autonomous power energy system composed from a synchronous generator (SG), wind turbine and the load is dynamically...
The paper present issues regarding the modeling and simulation in Matlab-Simulink environment of a doubly-fed three-phased induction machine operating in generator regime. The considered induction machine is of a special constructive type with alpha angle lagged windings. The machine presents three types of winding w1, w2 and w3, corresponding to the rotor, load and excitation. In the paper, there...
The paper presents the functioning stability problem of the synchronous machine in two cases: autonomous regime and parallel with grid of a certain voltage and frequency. Through numeric simulations, in dynamic regime, there is proved the fact that the synchronous generator (SG) is operating in a stable dynamic regime for any value of the load, in autonomous regime or connected to the grid (U, f)...
The present paper presents a solution for prolonging the battery life for motes within a wide-area wireless sensor network (WSN). In this particulars networks, the distances between motes and base stations are over the motepsilas communication range, and motes located between sinks and base station are commonly used both as regular motes and repeaters. This diminishes their energetic autonomy and...
The implementation complexity of classical algorithms for wind turbines control limits the utilization of low-end microcontrollers for such applications. We conceived an original method that aims to optimize the efficiency of windmills with fixed blades with the variation of the wind speed. In the paper we present an original method to determine generator's efficiency values using measurements that...
In this paper, a variable-speed wind turbine generator system with a vector controlled back-to-back PWM- VSI on the stator side has been modeled, designed and simulated to study its steady state and dynamic behavior. The grid connection control mode of a wind turbine based on a flexible dSPACE digital signal processor system that allows user-friendly code development, monitoring and online tuning...
The wind energy conversion systempsilas (WECS) analysis requires the priory knowledgepsilas regarding the mathematical models for all component subsystems. The paper highlights some contributions to the preset values establishing strategies and models of certain components: rotation speed and voltage preset values establishing strategies, a simplified wind turbine model (fixed blade turbine), the...
In this paper a study on the convergence properties of various parameter-estimation methods (both open and closed loop evolution) integrated in a control structure elaborated for the considered process is presented. Furthermore, stability analysis of several self-tuning control systems is provided on the basis of which conclusions are drawn regarding the design of self-tuning controllers.
In this paper, the performance of variable speed wind turbine concept with cage rotor induction generator connected to the grid is investigated. Variable-speed wind turbine generator system has been modeled and simulated to study their steady state and dynamic behavior. A cage rotor induction machine of 11 kW rating with a vector controlled back-to-back PWM-VSI inverter on the stator side have been...
The paper focuses on experimental investigation for stator faults detection and fault detection methods of electrical drive systems using voltage source inverter (VSI) fed cage rotor induction machines (CRIM). Two experimental investigations (one stator phase unbalance and one stator phase open) have been performed to study the behaviour of the electrical machine. A description of the measurement...
The paper presents considerations regarding the problematic of induction generator's (IG) self excitation. There are considered the known issues, such as load loss racing, excitation reactive energy compensation, self-excitation and plant interconnection. The conducted theoretical and experimental studies permitted the establishment of technical conditions necessary for a normal operation of an IG...
An adaptive self-tuning control solution is exposed in this paper. The control strategy is to minimize a cost function, which incorporates fluctuations of input, output and set point with the system-identified parameters. The designed control strategy proposes to remove the internal integrator component from the adaptive control law (which is inappropriate for some process due to control system instability)...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.