Assessment of System Frequency Support Effect of PMSG-WTG Using Torque-Limit-Based Inertial Control

Vahan Gevorgian, Yingchen Zhang, Eduard Muljadi, Xiao Wang, Wenzhong Gao, Jianhui Wang, Ziping Wu, Weihang Yan, Moses Kang, Min Hwang, Yong Kang

Research output: Contribution to conferencePaper

3 Scopus Citations


To release the 'hidden inertia' of variable-speed wind turbines for temporary frequency support, a method of torque-limit based inertial control is proposed in this paper. This method aims to improve the frequency support capability considering the maximum torque restriction of a permanent magnet synchronous generator. The advantages of the proposed method are improved frequency nadir (FN) in the event of an under-frequency disturbance; and avoidance of over-deceleration and a second frequency dip during the inertial response. The system frequency response is different, with different slope values in the power-speed plane when the inertial response is performed. The proposed method is evaluated in a modified three-machine, nine-bus system. The simulation results show that there is a trade-off between the recovery time and FN, such that a gradual slope tends to improve the FN and restrict the rate of change of frequency aggressively while causing an extension of the recovery time. These results provide insight into how to properly design such kinds of inertial control strategies for practical applications.
Original languageAmerican English
Number of pages6
StatePublished - 2017
Event2016 IEEE Energy Conversion Congress and Exposition (ECCE) - Milwaukee, Wisconsin
Duration: 18 Sep 201622 Sep 2016


Conference2016 IEEE Energy Conversion Congress and Exposition (ECCE)
CityMilwaukee, Wisconsin

NREL Publication Number

  • NREL/CP-5D00-68304


  • inertial control
  • torque limit


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