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In this paper sub-synchronous control interactions (SSCI) in doubly-fed induction generator (DFIG) based wind farms are studied. The SSCI problem has come into prominence since the Electric Reliability Council of Texas (ERCOT) event of 2009, where a faulted line and subsequent outage in the network caused a large DFIG wind farm to become radially connected to the series compensation network, resulting...
This paper proposes a novel rotor position estimation algorithm for the vector control of the doubly-fed induction generators (DFIGs) in wind power applications. The proposed algorithm uses a sliding mode observer (SMO) to estimate the rotor position information from the stator currents. The estimated rotor position is then used for the position sensorless vector control of the DFIG. The proposed...
Power generation and grid stability have become key issues in the last decade. The high penetration of large capacity wind generation into the electric power grid has led to serious concerns about their influence on the dynamic behavior of power systems. The Low-Voltage Ride-Through (LVRT) capability of wind turbines during grid faults is one of the core requirements to ensure stability in the power...
This paper proposes a power architecture to utilize doubly-fed induction generator (DFIG) for power generation from oscillating wave energy converter (WEC). Unlike in wind energy conversion system, the stator circuit of the DFIG can not be tied directly with the grid in wave energy conversion system (WECS). In WECS, the speed of the DFIG oscillates from one direction to another. Due to the change...
The performance of doubly-fed induction generators (DFIGs) would be affected by the rotor winding inter-turn short circuit fault, such as harmonics increase in electromagnetic quantities and torque pulsation. Thus, it is necessary to monitor and diagnose the rotor inter-turn fault for DFIGs. However, the rotor three-phase windings inherent imbalance and static air gap eccentricity may cause misdiagnosis...
As the contribution of wind energy to the power grid increases, serious concern about its influence on the dynamic behavior of the power system has also increased. This has raised the need for advanced analysis and simulation tools that can study the complicated dynamic behavior of wind turbines, test their controllers as well as emulate a complex power grid. Therefore, to meet all the aforementioned...
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