Research on Strategy of Wind-Storage Combined System Participating in Primary Frequency Modulation of Power System

With the yearly increase in wind power penetration and the mature application of energy storage (ES) technology, the primary frequency modulation (PFM) of wind-storage auxiliary power system is the main frequency modulation (FM) mode of the new power system in the future. First of all, this paper proposes the control strategy of wind-storage combined FM and the corresponding mathematical model. Thus, a combined FM control strategy of adaptive inertia control and ES dynamic droop control of wind turbine (WT) is proposed. Secondly, according to the operating conditions of the WT, this paper divides the wind speed section of the WT, and formulates the comprehensive control strategy of wind storage FM in different regions of low wind speed, medium wind speed and high wind speed, so as to improve the frequency response ability of the system. Finally, a typical two-area four-machine system is used as an example for simulation. The results show that the PFM of the auxiliary power system combined with WT and ES system can complement each other. It not only effectively improves the FM ability of the system, but also ensures the safe and stable operation of the high proportion of new energy power system.