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The paper builds a digital dynamic model of real time wind power grid system that STATCOM joined up DFIG on the platform of RTDS, analyses the main circuit and the control system of STATCOM, builds high voltage STATCOM model with small time step. According to the analysis on the converter theory of DFIG, control system of the grid side converter and the rotor side converter is constructed. Finally,...
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...
The use of doubly fed induction generators (DFIGs) in large wind energy conversion systems (WECS) has significantly increased during the last few years. The DFIG is interfaced to the AC network through a grid side voltage source converter (GSC) and a rotor side voltage source converter (RSC) to enable the variable speed operation of the wind turbine. Moreover, it provides reactive power support to...
Using power electronic converters with reduced capacity in Doubly-Fed Induction Generator (DFIG) based wind turbines makes them vulnerable to over-current during grid disturbances. Crowbar is an effective device to address this issue. This paper aims to analyze the behaviour of a doubly-fed induction generator (DFIG) based wind farm for various timing schemes of crowbar deactivation and resumption...
Nowadays, the power system is facing new challenges in increasing renewable energy sources' penetration. One of these problems is voltage stability in wind farms equipped with doubly fed induction generators (DFIGs) during grid faults. Flexible AC Transmission System (FACTS) devices can be used for this problem. This paper, investigates the Static Synchronous Compensator (STATCOM) application to achieve...
Optimal fault ride-through (FRT) conditions for a doubly-fed induction generator (DFIG) during a transient grid fault are analyzed with special emphasis on improving the active power generation profile. The transition states due to crowbar activation during transient faults are investigated to exploit the maximum power during the fault and post-fault period. It has been identified that operating slip,...
The doubly-fed induction generator (DFIG) now represents the dominant technology in wind turbine design. One consequence of this is limited damping and inertial response during transient grid disturbances. A dasiadecoupledpsila strategy is therefore proposed to operate the DFIG grid-side converter (GSC) as a static synchronous compensator (STATCOM) during a fault, supporting the local voltage, while...
Conceptually, a micro-grids can operate in parallel with the main grid system to support the grid voltage or as an isolated system to support customers isolated from the grid. In islanding operations, the micro-grid can continue to supply power to the customers thereby increasing the reliability of the power system. In a micro-grid with a significant percentage of wind power, a reactive power source...
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