Ride-Through Analysis of Doubly Fed Induction Wind-Power Generator with SGSC under Unbalanced Grid Voltage Conditions

Abstract

This paper presents a ride-through analysis of control way for a doubly fed induction generator DFIG based wind-power generation system with series grid-side converter (SGSC) underneath unbalanced conditions of network voltages. The analyses of the DFIG with SGSC running under network unbalance are delineated. That by injecting a series management voltage generated from the SGSC to balance the generator stator voltage. This unpleasant effects of voltage unbalance upon the DFIG, like stator  and rotor current unbalances, electromagnetic torque and power pulsations may be removed, then the standard vector management scheme for the rotor-side converter remains fully force underneath unbalanced conditions. As the same time, 3 control targets for the parallel grid-side converter (PGSC) are taken, together with eliminating the oscillations within the total real power or reactive power, or eliminating no order negative-sequence current injected to the network. In addition a definite current reference generation scheme for the PGSC has been made in the way to get more develops the operation carried out in the total work system. At last the proposed coordinated approach to the control scheme for the DFIG system with SGSC has been made certain by the simulation results of a MW DFIG based wind turbine with SGSC and testing results on a laboratory scale experimental to arrange underneath little steady-state grid voltage unbalance.