考虑风机调频能量差异的风电场频率主动支撑控制策略

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电力建设 ›› 0

李丰能, 杨苹, 隗知初, 陈文皓, 周钱雨凡, 万思洋

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

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

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摘要

【目的】风电机组通常运行在最大功率跟踪的状态,不为电网提供惯性响应及频率支撑的功能。为充分利用场站内风电机组的调频能力,提出一种考虑风机调频能量差异的风电场频率主动支撑控制策略。【方法】首先,推导风电机组在调频过程中的风能损失与转子转速之间的关系,对风电机组的可用调频能量进行评估计算,建立风电场的频率响应模型;其次,采用模型预测控制,以满足风电场的调频需求,充分利用机组的调频能量,减小调频过程中的风能损失为目标,优化调整风电场内各风电机组有功功率,充分利用场站内风机的调频能量为系统频率提供主动支撑。在频率支撑结束后,采用转子转速平滑恢复策略来恢复机组的转速。【结果】仿真结果表明,所提控制策略能够根据调频需求充分利用场内风电机组的调频能量,实现系统频率的有效支撑,同时降低调频过程中风电场的能量损失,在转速恢复阶段能够缓解频率二次跌落现象。【结论】该策略有效提升了风电场的频率支撑能力,通过优化调频能量分配降低了风能损失,提高了风电场的调频效率和经济性,为大规模风电并网提供了技术支撑。

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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李丰能, 杨苹, 隗知初, 陈文皓, 周钱雨凡, 万思洋. 考虑风机调频能量差异的风电场频率主动支撑控制策略[J]. 电力建设. 0

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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