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The aim of this paper is to develop a doubly-fed induction generator (DFIG) wind turbine model suitable for the simulation of this generator in the healthy mode and faulty mode. The dynamic model of a DFIG with rotor and stator inter-turn short circuit fault is proposed. A model (abc) is developed, which can represent both the healthy and faulty conditions. The DFIG is directly connected to the grid...
In recent years, environmental problems are becoming serious and renewable energy systems, especially wind power generation, have attracted much attention and been introduced into power systems. However, wind power generator output is intermittent, resulting frequency fluctuations in the connected power system. A doubly fed induction generator (DFIG) based diesel generation system is proposed in this...
Wind power generation has an essential role in renewable energy development. Doubly-fed induction generators (DFIGs) are widely used in wind energy systems due to their variable speed operation capability. In DFIG-based wind generation systems, the machine's stator is directly connected to the ac grid, while the rotor is controlled with a back-to-back converter. For practical simulation of large-scale...
Technological advancements has made production of electrical energy more efficient and minimized the consumption of non-renewable sources of energy. Wind energy has been harvested for more than a decade and has been considered to be one of the cleaner methods of producing electricity. This paper focuses on wind electric system connected to the grid. There are different types of wind electric generators...
Variable-speed turbines have gained increasing importance in pumped-storage power plants since they present big advantages compared to the classical topology with a synchronous generator. Within the variable-speed solutions, the one employing a doubly-fed induction generator (DFIG) has become the preferred alternative for large installations since it provides the advantages of variable-speed operation...
Although the brushless Doubly-Fed Induction Machine (DFIM) has great potential as generator system in large-scale wind turbines, its complexity has so far retained a commercial breakthrough. This paper contributes by combining brushless DFIM Finite Element (FE) modelling with multi-objective optimization. A static brushless DFIM FE model is applied with the NSGA-II multi-objective optimization algorithm...
The principle of DFIG wind power generation system is analyzed and the mathematic model is developed. The function of the active Crowbar in LVRT is studied and the parameters of the active Crowbar are given. The simulation result shows that the DFIG system with active crowbar can protect converter against overvoltage and over current. Finally, main power circuit and driving circuit of the active Crowbar...
When there has a sudden drop of grid voltage, crowbar protection circuit is a widely used method to improve the low voltage ride-through ability of wind turbines with doubly fed induction generator (DFIG), which is commonly used in wind power. This paper studied three-phase symmetrical short circuit current characteristics of DFIG with crowbar protection in depth, and simulations have been made in...
As a renewable, clean energy, wind energy has attract more and more attention. It has become a common understanding of the world to vigorously develop wind energy. In order to guarantee the safety and reliability for wind power integration operation, it is of great significance to establish an appropriate wind power generator system model and analyze its electromagnetic transient characteristics....
The fault ride-through ability of doubly fed wind generators (DFIG) has got more and more attention. New grid codes for interconnection of wind turbines required that wind turbines remain connected to the grid and actively contribute to the system stability during and after grid faults. Uninterrupted excitation of DFIG can both avoid running over-speed of wind turbines during grid faults and accelerate...
This paper presents a simple DFIG-based wind farm equivalent model which can be used to quantify a wind farm's short circuit current contributions to the grid, e.g. for the purpose of protective relaying setting. The model has taken the equivalent impedances Xss and the equivalent potential E'q as the characteristic parameters. By analyzing the short circuit behavior of a doubly fed induction generator...
Short circuit current characteristics of wind generators have been studied in this paper. Two types of wind generators have been considered. One is the induction generator; the other is the doubly-fed induction generator (DFIG). As to DFIG, there is always a crowbar to protect the power electronic converter at the rotor side. So the short circuit current of DFIG has been analyzed with consideration...
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