Vestas Wind Systems A/s

Leonard Schaier

Lars Helle

Allan Holm Jørgensen

Allan Holm JØRGENSEN

The present invention relates to an improved wind turbine, of the type which employs doubly fed induction generators (DFIG), and a wind park including the same, which permits the use of lighter weight turbines, with the ability to have greater energy capture, more precise control of asymmetrical phases and enhanced maintenance and support of the grid during fault conditions.

Variable speed wind turbine with a doubly-fed induction generator and rotor and grid inverters that use scalar controls

Methods for increasing a total reactive power capability of a cluster of wind turbines operationally connected to a grid and systems for carrying out the methods. The method includes generating a voltage value representative of a grid voltage level, determining a total required reactive power value based on the voltage value, and activating at least one wind turbine in said cluster to increase the total reactive power capability from a present value to the required total reactive power value by a predetermined amount.

Apparatus and method for controlling the reactive power from a cluster of wind turbines connected to a utility grid

A wind turbine and an associated method for controlling the output current from the wind turbine to an electric power grid and including the wind turbine and the method for controlling the current under conditions of grid voltage variations due to changing grid conditions as in the case when the wind turbine experiences and recovers from a fault.

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Port Washington, NY, United States of America

Leonard Schaier