| Title |
Synthetic Inertia Control Scheme of Wind Turbine Generators Using Event Size and Rotor Speed |
| Authors |
강종원(Jongwon Kang) ; 강용철(Yong Cheol Kang) ; 강기철(Kicheol Kang) ; 이영선(Youngsun Lee) ; 허견(Kyun Hur) ; 김규호(Kyu-Ho Kim) |
| DOI |
https://doi.org/10.5370/KIEE.2025.74.12.2083 |
| Keywords |
Event size; frequency deviation; frequency nadir; rotor-speed-dependent gain; synthetic inertia control |
| Abstract |
To enhance the frequency nadir without causing the excessive deceleration of rotor speed, synthetic inertia control (SIC) schemes of wind turbine generators (WTGs) need to provide incremental power in response to the frequency event size. Conventional stepwise SIC approaches face limitations during large events due to the increase of predefined incremental power, which does not match the actual event size. This paper presents an SIC strategy for WTGs that adjusts incremental power in relation to the event size while preventing excessive of rotor speed. During the frequency support phase, the incremental power is modulated based on the frequency deviation and its associated variable gain proportional to rotor speed. After the frequency support phase, the proposed method decreases the active power reference in accordance with rotor speed, ensuring it stabilizes within a secure operating range. Following stabilization, the WTG transitions smoothly back to maximum power point tracking operation. Simulation results indicate that the proposed approach significantly enhances the frequency nadir during large events, even under low wind conditions, while avoiding the excessive deceleration of rotor speed. |