Mathematical Problems in Engineering / 2014 / Article / Fig 9

Research Article

The Virtual Resistance Control Strategy for HVRT of Doubly Fed Induction Wind Generators Based on Particle Swarm Optimization

Figure 9

Rotor current, voltage with variable damping control in subsynchronization.
(a) Rotor current and voltage with 0.5 pu virtual resistance
(b) Rotor current and voltage with 1.5 pu virtual resistance