Abstract

Large-scale grid integration of variable speed wind generators may pose a threat to the security of power system operation, one of which is the damping of power system low frequency oscillations. On the one hand, the newly integrated wind generators interact with the electromechanical oscillation circuit of the traditional synchronous generators. On the other hand, there are interactions between multiple wind generators, both of which will affect the low frequency oscillation of the power system. This paper develops the damping torque method to study the influence of the dynamic interaction between multiple DFIGs on the low frequency oscillation of the power system. Firstly, the state space model of the multi-machine power system is established, and the transfer function model of the DFIG is given. Then, the damping torque of the two DFIGs connected to the power system simultaneously is analyzed. The direct influence path and indirect influence path of the two DFIGs on the electromechanical oscillation circuit are given. Through decoupling, the influence of the dynamic interaction between the two DFIGs on the electromechanical oscillation mode of the power system can be quantitatively evaluated. Finally, the correctness of this method is demonstrated by an example. The research results of the paper provide the theoretical support for the optimal design and control of wind generators.

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