基于减载系数变化的风电机组一次调频控制

风电机组参与电网一次调频对提高高比例风电并网系统的频率调节能力具有重要意义。分析风电机组传统一次调频控制下超速减载控制的功率跟踪曲线与下垂控制间的交互影响机制，结果表明该交互影响不能充分释放风电机组减载控制储备的备用功率，削弱了风电机组的调频能力；为了消除该交互影响，提出基于减载系数变化的风电机组一次调频控制策略，并给出一次调频参数设置方法。在PSCAD/EMTDC中搭建仿真算例，结果表明，所提控制策略能够很好地消除该交互影响，其频率改善效果优于传统一次调频控制。

Primary frequency control of wind turbine based on deloading coefficient variation

The participation of wind turbines in primary frequency control of power grid is of great significance to improve the frequency regulation ability of power system with high proportion of wind power. The interaction influence mechanism between power tracking curve of over-speed deloading control and droop control under the traditional primary frequency control of wind turbines is analyzed, and results show that the interaction influence cannot fully release the reserve power of deloading control of wind turbines, which weakens the frequency regulation ability of wind turbines. In order to eliminate the interaction influence, a primary frequency control strategy of wind turbines based on deloading coefficient variation is proposed, and a parameter setting method of primary frequency control is given. A simulation example is built on PSCAD/EMTDC, and the results show that the proposed control strategy can well eliminate the interaction influence, and its frequency improvement effect is better than that of the traditional primary frequency control.