Two-Stage Optimal Re/Active Power Control of Large-Scale Wind Farm to Mitigate Voltage Dip Induced Frequency Excursion
Zhao Chen, Dan Sun, Long Zhang, Heng Nian, Bin Hu
Abstract
A two-stage optimal active and reactive power coordinated control strategy of large-scale wind farm (WF) to mitigate voltage dip induced frequency excursion (VDIFE) is proposed in this letter. Before the voltage fault occurs, the power reference look-up table of each wind turbine (WT) are calculated. When voltage fault occurs, the power reference values of each WT are optimized based on model predictive control. Distinguished from existing works, the proposed optimal power control can better mitigate VDIFE and balance the variation of rotor speed of each WT. Case studies on a doubly-fed-induction-generator based WF built in MATLAB/Simulink are carried out to demonstrate the effectiveness of the proposed control scheme.