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Model‐based control addition to prescribe DFIG wind turbine fast frequency response

Funding information Electric Power Research Center, Iowa State University; Power Systems Engineering Research Center (PSERC), Project S-73G This paper investigates the physical capability of doublefed induction generator (DFIG) wind turbines for inertial support of frequency response. Frequency stability is modeled using the DFIG electromechanical and generator controller dynamics and a destabilizing effect is demonstrated in low-inertia systems. To improve response, a synchronous reference frameDFIG controller is proposed that acts by following low-frequency grid dynamics and adds a fast-acting PI-controlled frequency-responsive component to existing qd current commands. The proposed controller is derived in a straightforward manner using only the DFIG dynamic equations and is designed using pole/zero placement techniques. Laboratory experiments using a micro-scale DFIG wind turbinewith hub-emulatingflywheel provebetter capability for transient frequency regulation even under extreme load change. The result is a DFIG controller that balances the appearance of transients in electrical and mechanical systems. Value is achieved in providing immediate continuous inertial response to support load change. The proposed frequency response can improve the use of existing physical inertia fromwind turbines.