Patent ID: 8880228
Filing Date: 2014-11-04
Classification: H02J,Y02E

Abstract:
1. A system for mitigating an electric unbalance of a three-phase current at a Point of Common Coupling being located between a wind farm, the wind farm comprising a plurality of wind turbines and a power grid, the system comprising: a measurement device for measuring the electric unbalance at the Point of Common Coupling and for providing a measurement signal being indicative for the measured electric unbalance, and a central wind farm controller for controlling the operation of the plurality of wind turbines, wherein the central wind farm controller is coupled to the measurement device, wherein in response to the measurement signal the central wind farm controller is configured for providing a control signal for mitigating the electric unbalance at the Point of Common Coupling, and wherein the measurement signal is a Voltage Unbalance Factor which is given by the ratio between the amplitude of a negative sequence and the amplitude of a positive sequence of the voltage signal of the three-phase current at the Point of Common Coupling.