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The use of the Doubly-fed Induction Generator (DFIG) in large wind turbines is growing rapidly, the wind farms are today required to participate actively in grid operation by an appropriate generation control. The study focuses on the direct power control (DPC) of the DFIG active and reactive powers (DPC) using the so-called sliding mode control (SMC). A model has been developed, including the mechanical,...
A statistical approach is proposed in the assessment of voltage quality of network interconnected to a wind-farm. Random wind speed and uncertainty in the network status contribute toward the stochastic nature of the voltage quality. The analysis takes into consideration the reactive power capability of wind turbine generators (WTG). Judicious application of the reactive power control is shown to...
This paper calculates the reactive power limit of DFIG (doubly fed induction generator), and discusses the current reactive power control schemes of DFIG. Three methods, which use both the grid and rotor side converters for voltage regulation and reactive power support, are analyzed and compared. This paper presents a new coordinated control strategy, which central idea is to use the grid-side converter...
Oscillation damping via variable speed wind generators have been addressed in literature. Among the techniques, active power modulation has been studied. However, active power is closely related with electromagnetic torque. Modulating active power can introduce oscillations in the torque. This is undesired. The objective of this paper is to study an alternative technique - reactive power modulation...
With a view to the integration in national power system of new power plants based on renewable energy sources, such as wind energy, this paper presents the technical requirements related to the connection of the wind power plants to the main grid. Grid connected wind turbines may cause power quality problems, such as voltage variation and flicker, and therefore, the connection of wind farms requires...
Since the doubly fed induction generator (DFIG) converters are designed by the slip power (a fraction 25-30% of the total power) to achieve full control of the generator, there is not enough capacity to provide reactive power when the voltage dips below the tolerable grid voltage level at the point of common coupling (PCC). We propose in this paper to use the static synchronous compensator (STATCOM)...
The paper presents the dynamic model of doubly fed induction generator (DFIG) including the mechanical model, the generator model and the PWM voltage source converter model. The mechanical model uses two-mass model, and the generator model includes both the stator side and the rotor side dynamics. The PWM voltage source converter is modeled as an average model in which the action of power electronic...
Summary form only given. This work demonstrates that the integration of variable speed wind systems with doubly fed induction generators and a four quadrant AC-to-AC converter connected to the rotor windings (DFIG), increases the transient stability margin of the electrical grids, when compared with the case where the fixed speed wind systems with cage generators are used. The results clearly show...
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