Coordinated Control Using Backstepping of DFIG-Based Wind Turbine for Frequency Regulation in High Wind Energy Penetrated System

Table 2

Simulation scenarios.

Scenarios	S1	S2	S3	S3	S4
Generation units 1, 2, and 3	C	C	C	C	C
Generation unit 4	C	NC	NC	NC	NC
Wind farm	NC	C no control	C only IC	C only PFC	C IC and PFC

C: connected; NC: nonconnected; PFC: primary frequency control; IC: inertial control.