基于事件大小和转子转速的风力发电机合成惯性控制

To enhance the frequency nadir without causing the excessive deceleration of the rotor speed (ωr), synthetic inertia control (SIC) schemes of a wind turbine generator (WTG) need to provide incremental power in response to event magnitude and ωr. 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 event size and ωr. During the frequency-support phase, the incremental power is modulated based on the frequency deviation, along with a control gain proportional to ωr, rather than the rate of change of frequency. While this approach accounts for the power imbalance, it remains vulnerable to noise and delays in practical applications. After the frequency-support phase, the proposed method decreases the active power reference in accordance with ωr, 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 excessive deceleration of the rotor speed.