Coordinated control strategy of primary frequency regulation of power grid with actively participating combined wind-storage system
Enhancing the rotational inertia level of the wind power grid-connected system through the coordinated control of the wind-storage combined system(WSCS)is an important means to enhance the frequency stability of the system.The coupling degree of WSCS is low,and it is difficult to give full play to the response and adjustment capabilities of wind power and energy storage to frequency disturbances.In this regard,this paper proposes a coor-dinated control strategy for the WSCS based on the Linear Quadratic Regulator(LQR).This strategy takes the out-put frequency of the DFIG and the total output power of the WSCS as the control input of the energy storage to im-prove the damping and stability of the system and enhance the frequency response adjustment capability of the sys-tem.Firstly,according to the state equation of the system,the small-signal stability model of the DFIG and the WSCS is established,and the effect of coordinated control on the damping ratio of WSCS is analyzed.On this ba-sis,the energy storage power capacity is determined according to the maximum rotor kinetic energy released by the synchronous generator.Finally,the grid-connected model of the WSCS is built in Matlab/Simulink,which verifies the effectiveness and superiority of the strategy.
wind powerenergy storagecoordinated controlfrequency modulationLQR control
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NSTL
万方数据
维普
