Active Frequency Support Control Strategy for Wind Farm Considering the Energy Discrepancy of Wind Turbines

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LI Fengneng, YANG Ping, WEI Zhichu, CHEN Wenhao, ZHOU Qianyufan, WAN Siyang

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Abstract

[Objective] Wind turbine generators generally operate in maximum power point tracking mode and do not provide inertial response and frequency support to the power grid. To fully utilize the frequency regulation capabilities within a wind farm, this study proposes an active frequency support control strategy for wind farms that accounts for the energy discrepancy among wind turbines. [Methods] The relationship between wind energy loss and rotor speed during the frequency regulation process was derived, and the available frequency regulation energy of wind turbines was evaluated to establish a frequency response model for a wind farm. Model predictive control was subsequently employed to optimize the active power distribution among wind turbine generators. This strategy aims to satisfy the frequency regulation demands of the wind farm, fully utilize the frequency regulation energy of the turbines, and minimize wind energy loss during the process. Following the frequency support phase, a rotor speed recovery strategy is implemented to restore the generator speed. [Results] Simulation results demonstrate that the proposed control strategy effectively utilizes the frequency regulation energy of wind turbines within the farm to actively support system frequency, while also reducing energy loss during the frequency regulation process and mitigating secondary frequency drops during the rotor speed recovery phase. [Conclusions] The proposed strategy effectively enhances the frequency support capability of wind farms by optimizing the allocation of frequency regulation energy, reducing wind energy loss, improving the efficiency and economic performance of wind farm frequency regulation, and providing technical support for the large-scale integration of wind power.

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LI Fengneng, YANG Ping, WEI Zhichu, CHEN Wenhao, ZHOU Qianyufan, WAN Siyang. Active Frequency Support Control Strategy for Wind Farm Considering the Energy Discrepancy of Wind Turbines[J]. Electric Power Construction. 0

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Funding

This work is supported by National Key Research and Development Program of China (No. 2023YFB4203102) and the Marine Economic Development (Six Marine Industries) Special Fund Project of Guangdong Province (No. GDNRC[2023]27).