Patent ID: 7518256
Filing Date: 2009-04-14
Classification: F03D,H02P,Y02E

Abstract:
1. A control system for a double-fed induction generator (DFIG) comprising a rotor ( 1 ) having rotor windings and a stator ( 2 ) having stator windings connectable to a grid for electric power distribution; said control system comprising a converter ( a rotor-inverter ( a grid-inverter ( a DC-link ( the converter ( when the clamping unit is in its non-operating state, currents in the rotor windings cannot pass through said clamping element, and when the clamping unit is in its operating state, currents in the rotor windings can pass through said clamping element, the clamping unit further comprising for each phase of the rotor, a connector ( said clamping element comprising at least one passive voltage-dependent resistor element (