提高互联系统频率稳定的风电场与VSC-MTDC协同控制策略OA

In response to the growing frequency stability concerns caused by large-scale integration of renewable energy,this study investigates a coordinated control strategy for wind farms connected through voltage source converter based multi-terminal high voltage direct current(VSC-MTDC)systems.Wind farms are equipped with additional inertia and droop control to release rotor kinetic energy for frequency regulation.The converter stations employ virtual inertia control to establish a correlation between AC fre-quency and DC voltage,thereby utilizing DC capacitors energy for power regulation.Meanwhile,the power margin of converter stations is introduced to adjust droop coefficients,enabling rational redistribution of power imbalances in the DC system and mutual power support among AC systems.Furthermore,the fre-quency deviation is used as the input signal,and processed through a first-order low-pass filter,where high-frequency components are applied to the rotor control of wind turbines and the low-frequency com-ponents to the droop control of converter station,synergistically improving the frequency response of the AC system.Simulation results validate the effectiveness of the proposed method,demonstrating its capability to significantly increase the equivalent inertia of the system and improve frequency stability performance.