2.3.3 Rotor side converter controller
The RSC controller, as shown in Figure 4 [12,17,18,25], aims to control the active and reactive power of the DFIG’s
stator. RSC controller consists of current inner loop and power outer loop.
In Figure 4, QS and QS- ref are the reactive power and the reference reactive power of the DFIG’s stator; PS and PS -ref are the active power and the reference active power of the DFIG’s stator; x 18, x19 ,x 20 and x21 are intermediate variables; other parameters mean the same as above. The units are in p.u. except t in seconds.