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.
In this paper, a novel dynamic model of a self-excited induction generator (SEIG) is presented. In the proposed model, the fundamental stray load and iron losses are accounted for in a way that preserves the order of the conventional induction machine (IM) model. The corresponding equivalent resistances are determined from the standard tests. The SEIG has been considered as part of a wind conversion...
This paper presents a robust sensorless control technique for Permanent Magnet Synchronous Generator-wind Turbine (PMSG-WT). This strategy is based on Adaptive sliding interconnected observer to estimate the stator currents, the rotor speed and and the stator resistance. The vector control is applied to the control of the PMSG. The stability analysis of the applied observer is provided using the Lyapunov...
With rapid increase in the use of wind energy as a source of renewable energy, it is necessary to keep wind turbines (WT) connected with the grid during grid faults and other disturbance. Since the disconnection of wind energy system lose a significant share of power grid. To accomplish this issue protective measure should be taken. This paper incorporates superconducting fault current limiter (SFCL)...
The doubly fed induction generators (DFIGs) are used in almost 50% of the offshore and onshore wind power plants. The DFIGs offer advantages compared to fix speed induction generators. The DFIGs are sensitive to grid voltage disturbances and require additional protection for the rotor side power electronic converter, like crowbar protection. In the present paper two active crowbar topologies are compared,...
Nowadays, wind power has been developed very fast in China and the installed capacity of wind turbine has been increased rapidly. As an important wind driven generator, doubly-fed induction generator (DFIG) has been applied very popularly for its many advantages, such as less converter losses and simpler control methods. When the grid voltage dip occurs, a crowbar beside the rotor-side converter is...
The crowbar circuit installed in the rotor side is frequently adopted by doubly-fed induction generator (DFIG) to implement low voltage ride through (LVRT) ability. Based on DFIG transient characteristic, this paper discusses the principle of choosing crowbar resistance and input lasting time from the view point of converter security, wind turbine security and wind power generation system restoring...
The crowbar resistance plays an important role in the protection of Doubly-fed induction generator (DFIG) wind power generation systems during grid voltage dips. This paper presents a novel control strategy primarily based on the real-time adjustable resistance crowbar structure. Design and control of the real-time adjustable resistance crowbar structure is described to limit the peak values of the...
An analytical method of calculating an optimal resistance for crowbar of doubly fed induction generator (DFIG) under single phase fault is proposed by taking into account the impact of crowbar on reactive power, rotor current, voltage and electrical torque respectively. Finding the optimal resistance value for the crowbar is based on Analytic Hierarchy Process (AHP) in this paper, of the DFIG during...
Low Voltage Ride Through is an important feature for wind turbine systems to fulfill grid code requirements. In case of wind turbine technologies using doubly fed induction generators the reaction to grid voltage disturbances is sensitive. Hardware or software protection must be implemented to protect the converter from tripping during severe grid voltage faults. In this paper two methods for low...
Permanent magnet synchronous generators (PMSG) are at the core of small scale wind power generators manufactured by a wide range of manufacturers in different configurations: vertical or horizontal axis blades, with various geometries and aerodynamics of the blades; by installing these small scale wind turbines in very large numbers at household levels, it is expected that these will make a positive...
This paper presents a direct drive of multiple multi-pole synchronous generators for wind energy conversion system. The concept of multiple-synchronous-generator drive is demonstrated by a single current-controlled inverter feeding 2 multi-pole synchronous generators connected in parallel. In addition, the torque unbalance of the drive is investigated by taking into account the parameters mismatch...
For DFIG (doubly fed induction generator)-based wind turbines, crowbar is a commonly used protection method against surge current caused by sudden drop of the grid voltage during the period of LVRT (low voltage ride-through). Based on detailed analysis of the transient flux characteristics of DFIG with the crowbar fired, a simplified model is proposed to analyze and approximate the short circuit current...
Nowadays, wind turbines implementing doubly fed induction generators (DFIG) occupy the largest share of the wind power market. These machines incorporate the benefits of variable speed generators in a cost-effective way but are very sensitive to grid disturbances and especially to voltage dips. To prevent the damages that grid disturbances can cause to the converter, the machines are equipped with...
This paper presents an artificial neural network (ANN) observer for a speed sensorless permanent magnet synchronous generator (PMSG) in wind energy conversion system (WECS). In order to perform maximum power point tracking control of the wind generation system, it is necessary to drive wind turbine at an optimal rotor speed. From the aspect of reliability and increase in cost, wind velocity sensor...
In order to investigate the transient response of doubly fed induction generator (DFIG) under grid disturbances, an accurate model is required. This paper uses available DFIG models and investigates the influence of various model parameters and simplifications for both mechanical (two-mass model) and electrical (saturation) subsystems on DFIG based wind plant transient response. Then, the factors...
This paper investigates the impact of the control system bandwidth on the detection of incipient faults in doubly fed induction generators used in wind turbines. In this application, the rotor is supplied by a static converter for the control of active and reactive power flows from the generator to the electrical grid. The Impact of the closed loop control system cannot be neglected when the detection...
The doubly-fed induction generator (DFIG) based wind turbines of today are often equipped with a crowbar, which can be used to limit the inrush rotor current and protect the ac excitation converter from damage via a set of resistors that are connected to the rotor windings of the DFIG. When the rotor current becomes too high due to the severe grid voltage dips on the transmission line, the crowbar...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.