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This paper presents a theoretical study, a numerical simulation and an experimental validation of a Wind Energy Conversion System (WECS) control by using a back to back three-level NPC converter. In this context, the WECS, which is based on Doubly Fed induction Generator (DFIG), has been briefly described, and its hierarchical control system with a three-level NPC back-to-back converter has been detailed...
Nowadays, there is a tendency to increase the capacity of wind turbines, multilevel converter is a realistic alternative in such high power applications. As the wind power penetration continues to increase, grid codes have been revised to require wind farms to operate as conventional power plants. This paper proposes a reconfiguration scheme of control strategies for doubly fed induction generator...
This paper presents a general modeling and an experimental validation of a doubly fed induction generator (DFIG) based wind conversion system (WCS). The wind conversion system has been briefly presented. Then, the d q control of the grid side converter (GSC) has been detailed theoretically. Moreover, the decoupled active and reactive powers control of the DFIG has been presented. The last is carried...
Nowadays, the most widely used variable speed machine for wind turbine above 1 MW is the doubly fed induction generator (DFIG). As the wind power penetration continues to increase, wind turbines are required to provide Low Voltage Ride-Through (LVRT) capability. Crowbars are commonly used to protect the power converters during voltage dips. Its main drawback is that the DFIG absorbs reactive power...
Nowadays, the wind market is dominated by doubly fed induction generator (DFIG) based wind turbines. However, they are very sensitive to grid faults due to the small rated power converters and direct connection to the grid. In order to improve its Low Voltage Ride-Through (LVRT) capability, this paper proposes a modified vector control strategy of the DFIG by considering the dynamics of stator flux...
Nowadays, the most widely used variable speed wind turbine type for units above 1 MW is doubly fed induction generator (DFIG). As the wind power penetration continues to increase, wind turbines are required to remain connected during grid faults to ride-through the faults. This paper gives a control oriented modeling of DFIG wind turbines by using causal ordering graph (COG). The control system consists...
Vector field control of Doubly Fed Induction Generators enables to generate/absorb reactive power. These machines are more and more used in wind farms. Their reactive power generation capabilities are related to their operating points. This paper presents a centralized supervision of the reactive power control for a wind farm. A weighting distribution strategy has been used in order to determine the...
One of the most inherent problems of the multi-level NPC topology is to maintain the neutral point voltage in a narrow band around the half of the DC voltage. This paper presents a DC-link voltage balancing algorithm for three-level voltage source inverter using a new space-vector based on hysteresis current control (SV-HCC). The proposed SV-HCC controls the active and reactive power delivered to...
In order to investigate the dynamic behaviour of a wind turbine with Doubly Fed Induction Generator (DFIG) connected to the network during grid disturbance, this paper presents an equivalent continuous model. This model includes mechanical, electrical parts and the connection system to a distribution network. A comparison of two different DFIG control strategies during network faults is shown with...
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