基于模型预测控制的混合储能风电场一次调频策略

Primary Frequency Modulation for Hybrid Energy Storage Wind Power Plant Based on Model Predictive Control

风电机组通过减载控制预留备用容量参与系统调频,导致风机发电效益低。提出了混合储能参与风电场一次调频的策略,风电机组的调频完全由储能系统控制,无须改变或增加风电机组额外控制。该策略在考虑储能各自约束条件下,定义其优化指标,求解滚动时域最优控制问题协调两者间的输出功率分配。电网的有功功率不平衡值通过滚动时域估计求解,以获得更精准的系统状态。对比表明所提出的混合储能调频策略可以提高调频性能。

Wind turbines generally participate in frequency modulation of the system by reserving reserve capacity through load reduction control,which leads to low power generation efficiency of the fan and problems such as frequent changes in pitch Angle and speed.Based on the model predictive control method,the strategy of mixed energy storage participating in wind farm primary frequency modulation is proposed.The frequency modulation at the wind turbine is completely controlled by the energy storage system,and there is no need to change or add additional control to the wind turbine.Considering the constraints of the two kinds of energy storage,the optimal index is defined,and the rolling time domain optimal control problem is solved to coordinate the out put power allocation between the two kinds of energy storage.The active power imbalance value of the grid can be solved by rolling time domain estimation,so more accurate system state can be obtained.Finally,the simulation results verify the proposed FM strategy,and the results show that the strategy can improve the performance of FM.