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This paper presents an innovative DFIG which has autonomous frequency control for stand-alone operation. When the wind farm is islanded, such DFIGs synchronize to form a reliable wind farm frequency source which does not collapse when member DFIGs fail. The frequency enables frequency droop control to be implemented for load sharing. The wind farm can provide fast reserve, ready to support a weakened...
The behavior of wind farms with doubly fed induction generators (DFIGs) in fault ride through (FRT) conditions is investigated in the first part of this article. The requirements mandated by grid-codes to contribute to the voltage stability are introduced. Afterwards, the problems associated with applying the crowbar system in FRT conditions are discussed. In the next part, modeling of this problem...
The paper deals with a wind power generation system which consists in wind turbines driving an asynchronous Doubly-Fed Induction Generator — DFIG connected to a 0.4 kV three-phase network. The wind turbines which use DFIG generators provide a constant frequency although the rotor operates with variable speed, by means of the converter with IGBT AC-DC-AC transistors based on PWM control. There are...
Coordination of STATCOM and DFIG becomes necessary during steady-state as STATCOM exists in the system to improve the fault-ride through capability of DFIG. This paper aims to perform the coordination by means of minimizing the power loss of the system. As reactive power flow in the system has direct impact on the loss of the system, utilizing reactive power sources effectively can reduce the loss...
With the capacities of wind generators in power system rapidly increasing, wind farms has impact on the AC grid obviously. So the problem which is to improve Low Voltage Ride Through (LVRT) capability of wind generators needs to be solved urgently. Base on the design of controllers of DFIG and controllers of VSC-HVDC system, the wind farms connected to the AC grid by two different methods of AC and...
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,...
Due to growing power demand and environmental concerns, electrical power generation from renewable is receiving more attention. Wind energy generation systems are being connected in increasing numbers to power systems worldwide. DFIG has remained as promising research area for many researchers due to many reasons. This paper presents a critical survey on grid integration issues of DFIG based wind...
Wind farms begin to influence the power systems with the increasing amount of wind power penetration. The study of such influence justifies the need of a dynamic wind farm model comprising of a large number of generators, but detail models require high simulation computation time. An aggregation technique is required to reduce the model order while maintaining its accuracy. In this paper, a complete...
This paper investigates the contribution of Doubly-Fed Induction Generator (DFIG) based wind farms in short term frequency control of power systems. First, three features of DFIGs that make them capable to participate in frequency control are introduced. Then, a new effective method to exploit these capabilities is proposed. The method estimates the system active power imbalance, using system average...
This paper proposes a decoupled fault ride-through strategy for a doubly fed induction generator (DFIG) to enhance network stability during grid disturbances. The decoupled operation proposes that a DFIG operates as an induction generator (IG) with the converter unit acting as a reactive power source during a fault condition. The transition power characteristics of the DFIG have been analyzed to derive...
For wind farms in near sea, in which doubly-fed induction generator (DFIG) runs, located at different site respectively, multi-terminal VSC-HVDC (Voltage Source Converter based HVDC) helps to resolve connection for each other and transmitting electrical power into main grid. The paper models wind farms, VSC-HVDC, designs control system and specially takes their control together into account in order...
Increasing penetration of the large wind farm in the system has forced the power system policy makers to develop new electricity grid codes which are required for the wind power generator to fulfill the same requirements as conventional power plants. In this paper, a series connected grid side converters with conventional doubly-fed induction generator (DFIG) scheme is explored to suit the grid code...
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