An Emergency Control Method for Wind-Thermal Bundled System

Wind and thermal power bundling is an effective means to solve the problem of power delivery from energy bases. In this paper, an emergency control method for wind-thermal bundled system is proposed. After the system is out of step, the stability of the system can be assessed quickly by using phase measurement unit (PMU) data and the power angle threshold can be determined. When the power angle threshold is reached, using power electronic equipment quickly to exchange the connection by disconnecting the primary side phase of the line at the synchronizer outlet. Then, the A, B, C three-phase series are connected to the C, a, B three-phase series, and the angle is reduced by 120 degrees instantaneously. This preventing the system from falling out-of-step while maintaining the integrity of the system and the inertia level. The higher the wind power permeability, the better the performance of the proposed control method is. A case study is provided to verify the effectiveness of the proposed method.