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The need for accurate dynamic models of wind plants for grid planning studies is increasing as penetration of wind power increases. Furthermore, the ultimate objective is a moving target. As wind penetration increases, grid codes are evolving to include more rigorous performance requirements, which in turn lead to more sophisticated control functions and dynamic characteristics of wind turbines and...
A variable frequency transformer (VFT) is being installed at AEP's Laredo substation, where it will be used to exchange up to 100 MW of power between the asynchronous power grids of ERCOT (Texas) and CFE (Mexico). Functionally, the VFT is similar to a back-to-back HVDC converter. The core technology of the VFT is a rotary transformer with three-phase windings on both rotor and stator. A motor and...
A new power transmission technology has been developed. The variable frequency transformer (VFT) is a controllable, bi-directional transmission device that can transfer power between asynchronous networks. Functionally, the VFT is similar to a back-to-back HVDC converter. The core technology of the VFT is a rotary transformer with three-phase windings on both rotor and stator. A motor and drive system...
Turbine-generators have torsional natural frequencies due to physical properties of their long multi-element shafts. Series capacitor compensation in ac transmission networks has a tendency to reduce damping of torsional vibrations of nearby turbine generators. The phenomenon is called subsynchronous resonance (SSR), and it affects turbine-generators at subsynchronous frequencies that are specific...
A new power transmission technology has been developed. The variable frequency transformer (VFT) is a controllable, bi-directional transmission device that can transfer power between asynchronous networks. Functionally, the VFT is similar to a back-to-back HVDC converter. The core technology of the VFT is a rotary transformer with three-phase windings on both rotor and stator. A motor and drive system...
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