Inertia control of DFIG-based wind turbines for interconnected power system stability enhancement

When the variable speed wind turbines with virtual inertia are connected to the grid, the transient stability control of the interconnected system will be more flexible. Firstly, the linearized state equation of equivalent two-machine system with wind power was derived, and respective influences of terminal unit inertial changes on the transient stability of power system were analyzed. Secondly, a power angle transient stability control strategy based on inertia regulation was proposed, which can improve the system transient stability by coordinating the inertia of two sub-regions. Finally, this paper established a simulation model of the two regional power grids with high wind power penetration. The simulation results verified the correctness of the analysis results and the effectiveness of the proposed control strategy.