Virtual Inertia Strategy of Doubly-Fed Induction Generator Participating in Power Grid Primary Frequency Modulation

With the continuous increase of new energy generation and large-scale grid-connected and the rapid construction of new power systems, the form of power system is undergoing important changes. The proportion of traditional units such as water and thermal power in the total power generation will continue to decrease, and the reduction of system inertia will also become a major problem. This paper studies the control strategy and inertia level of doubly-fed induction generator, and combines the existing two virtual inertia control methods, using MATLAB/Simulink platform to simulate the system. In a three-machine nine-node system with a wind power penetration rate of 20%, the influence of these methods on the frequency modulation ability of the system is verified, and their advantages and disadvantages are analyzed. The results show that these methods have important application value in improving the frequency security of new power systems.