A Novel Active Power Control Framework for Wind Turbine Generators to Improve Frequency Response

Wind generation is expected to reach substantially higher levels of penetration in the near future. With converter interface, the wind unit's rotor inertia is effectively decoupled from the system, causing a reduction in inertial response. Moreover, the replacement of conventional synchronous generators with governors also reduces primary control capability. This paper proposes a novel active power control framework to enable doubly fed induction generator (DFIG) to participate in frequency regulation. The DFIG is controlled in different operating modes with switching among the different modes achieved by modifying reserve input. The DFIG is designed to provide both inertial and primary frequency support considering both underfrequency and overfrequency events. The effectiveness of the proposed control framework is demonstrated through case studies on a 181-bus WECC system with 50% wind penetration.