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JEET, Vol. 10, No. 2, March 2015 
Inertial Control of a DFIGbased Wind Power Plant using the Maximum Rate of Change of Frequency and the Frequency Deviation
Yong Cheol Kang 
Area 
A  Electric Power Engineering 
Abstract 
In order to let a wind generator (WG) support the frequency control of a power system, a
conventional inertial control algorithm using the rate of change of frequency (ROCOF) and frequency
deviation loops was suggested. The ROCOF loop is prevailing at the initial stage of the disturbance,
but the contribution becomes smaller as time goes on. Moreover, its contribution becomes negative
after the frequency rebound. This paper proposes an inertial control algorithm of a wind power plant
(WPP) using the maximum ROCOF and frequency deviation loops. The proposed algorithm replaces
the ROCOF loop in the conventional inertial control algorithm with the maximum ROCOF loop to
retain the maximum value of the ROCOF and eliminate the negative effect after the frequency
rebound. The algorithm releases more kinetic energy both before and after the frequency rebound and
increases the frequency nadir more than the conventional ROCOF and frequency loops. The
performance of the algorithm was investigated under various wind conditions in a model system,
which includes a doublyfed induction generatorbased WPP using an EMTPRV simulator. The
results indicate that the algorithm can improve the frequency drop for a disturbance by releasing more
kinetic energy. 
Keyword 
Inertial control,Frequency deviation,Maximum rate of change of frequency and frequency support

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