风电场采用健康系数与变下垂输出系统参与电网调频研究

针对风电场参与电网调频导致备用功率冗余的问题，建立了风电场基于健康系数的备用功率分配系统与变下垂系数的备用功率输出的系统。为了分配风机备用功率与控制风机备用功率输出，采用了ARMA风功率预测法对风电场5台风机的历史功率数据进行处理，得到风机的能量密度和功率预测准度，再通过模糊逻辑系统求得风机健康系数，并按照健康系数进行备用功率分配。当频率响应系统检测到频率误差后，控制风机变下垂功率输出系统进行功率补偿，稳定电网频率。仿真结果表明，基于健康系数的功率分配系统与变下垂功率输出系统增加了风电参与电网调频的能力，减少了系统备用功率的冗余。

Research on Wind Farm Standby Power Participating in Power Grid Frequency Modulation Based on Load Shedding Control

To solve the problem of redundancy and over-frequency modulation of the backup power caused by wind farms participating in grid frequency modulation, a backup power distribution system based on the turbine health factor and a backup power output system with the variable droop coefficient are established. At the same time, in order to distribute the turbine standby power and control the turbine standby power output, the ARMA wind power prediction method is used to process the historical power data of 5 turbines in the wind farm to obtain the energy density and power prediction accuracy of the turbines and then the health factor of the turbines is obtained by fuzzy logic system, and the standby power is allocated according to the health factor. When the frequency error is detected by the frequency response system, the variable droop power output system of the turbine is controlled for power compensation to stabilize the power grid frequency. The simulation results show that the power distribution system based on health factor and the variable droop power output system increase the ability of wind power to participate in the power grid frequency modulation and reduce the redundancy of the system reserve power.