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.
This paper presents the analyzed results of an integrated offshore wind farm (OWF) and seashore wave farm (WAF) connected to an onshore large power grid through a variable frequency transformer (VFT) to simultaneously achieve power-fluctuation mitigation and stability enhancement. The performance of the studied OWF is simulated by an equivalent aggregated 80-MW doubly-fed induction generator (DFIG)...
The aim of this paper is to present the study, the control and the simulation of the wind mill connected to the electrical supply network of strong power at variable speed based on a dual stator induction generator (DSIG). The study of operation of the wind turbine leads us to two essential cases: optimization of the power for wind speeds lower than the nominal speed of the turbine and limitation...
Simulation has become the most important technique used today for evaluation of engineering solutions, and modeling plays a crucial part in the design of intelligent control paradigms for complex dynamic structures. For the analysis of a megawatt-class wind-energy conversion system (WECS), this research adopts the H∞ control theory in designing an advanced control paradigm that accomplishes the dual...
An alternative structure for variable speed wind turbine, using multiple permanent magnet synchronous generators (PMSGs) drive-train configuration and cascaded multilevel converter is proposed in this paper. This study presents a power electronic solution for the wind turbine. A transformer-less cascaded multilevel converter interface based on PMSGs is developed to synthesize a desired high ac sinusoidal...
The paper describes the design of a Doubly Fed Induction Generator (DFIG) connected to the grid through back-to-back converters in the rotor circuit. A vector control oriented with the stator voltage is applied for the grid side converter that is responsible for maintaining the DC link voltage constant regardless of the power flow between the rotor and the grid. A field orientation control with the...
The paper analyses and compares some solutions of AC/DC converter stages in grid connected Wind Energy Conversion Systems (WECSs), using modular Permanent Magnet Synchronous Generators (PMSGs). The converter dispositions here analyzed are based on 3-phase diode bridge rectifiers, and consider also the possibility of a commutation in winding connections.
This paper adopts a main circuit structure with back-to-back PWM converter, in which generator-side using direct torque control method, and grid-side adopts three-phase VSR inner current decoupling control based feed forward control algorithms, and this paper proposes an improved MPPT control methods, which can achieves more quickly and effectively tracking the maximum power. Finally, the effectiveness...
In this paper, a vector control mechanism has been suggested and applied to simulate the operation of a Doubly-Fed Induction Generator (DFIG) attached to an isolated off-the-grid wind turbine, to demonstrate that these generators can be used at lower costs to control the power quality in stand alone wind turbines. In order to achieve this end, the alignment of the d-axis of the synchronously rotating...
This paper investigates the possibility to use a power split electric driven continuously variable transmission as the core of a wind energy conversion system. The proposed power split transmission for WECS, called W-CVT allows to control the speed of the turbine rotor by keeping constant the speed of the electric generator. The W-CVT is constituted by a planetary gear set integrated with a small...
This paper deals with power extraction maximization and grid fault tolerance of a doubly-fed induction generator (DFIG)-based wind turbine (WT). These variable speed systems have several advantages over the traditional wind turbine operating methods, such as the reduction of the mechanical stress and an increase in the energy capture. To fully exploit this latest advantage, many efforts have been...
In the past, wind turbines were only required to provide limited ancillary services and they could inject as much power as they wanted in the grid. Nowadays the impact of wind turbines is no longer negligible. Therefore, many system operators have put in place grid codes which require renewable energy sources support the power system and provide ancillary services. These new ancillary services have...
Grid connected wind energy conversion systems (WECS) present interesting control demands, due to the intrinsic nonlinear characteristics of windmills and electric generators. In this paper a predictive control strategy for doubly fed induction machine is proposed. The doubly fed induction machine is used in generating mode for large-scale grid-connected variable speed wind turbines. In order to control...
This paper investigates the new wind power generation system, which uses the diode rectifier to convert the real power from the induction generator to the intermediate DC voltage, and the inverter to supply the reactive power necessary to excite the induction generator. This scheme is expected to reduce the system cost. Control scheme and soft start strategy are verified by the simulation.
This paper analyses the influence of different wind energy converter control methods on the connected electrical grid. As the wind energy propagates through the converter to the mains, their frequency components are influenced by the conversion processes. The plant control strategies have a major influence on these components. Especially frequencies between 2 Hz and 8 Hz can cause undesired flicker...
Grid connected wind turbines are fluctuating power sources that may produce flicker during continuous operation. This paper presents a simulation model of a MW-level variable speed wind turbines with a permanent magnet synchronous generator (PMSG) and a full-scale converter developed in the simulation tool of PSCAD/EMTDC. Flicker emission of this system is investigated during continuous operation...
The stochastically fluctuating offer of wind energy limits the supply capacity in electrical grids by means of technical and economical reasons. This paper analyses the influence of the control method on the power output characteristic of wind energy converters. Conventional controls, like optimal rotor speed control, and a new control, the stochastic dynamic optimization, are compared in regard of...
A comparison of the performances between the OptiSlip pitch regulated wind system (Vestas V39-600) and a fixed speed stall regulated wind system of the same power. This comparison will relate to the quality of the power generated by each of the two systems and their stabilities following a grid fault.
Notice of Violation of IEEE Publication Principles"Fuzzy Logic Based Control of Variable Speed Induction Machine Wind Generation System," by K. Kaur, S. Chowdhury, S.P. Chowdhury, K.B. Mohanty, A. Domijan,in the Proceedings of the IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century, 2008 pp.1-11, 20-24 July 2008After careful and...
The current tendency of the development of wind power technology is that the variable wind turbines adjust the speed of wind rotor at real time in accordance with wind speed to absorb wind energy more effectively and improve the operating condition of power chain. A critical point of the design of variable wind turbines is to settle the influence of wind speed changes on the smooth electric power...
This paper proposes a new solution for wind electrical energy generating system (WEEGS). The system here taken into account is moved by a modular multiple blade fixed pitch wind turbine (MMBFPWT) and foresees a new MPPT algorithm whose main characteristics are low cost, low noise, buildings simplicity and modularity. The mathematical model of the entire WEEGS has been here developed taking into account...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.