Emergency Control Strategy for Transient Stability in Large Power Grid Considering Distributed Generation

Most of the distributed generation supply based on power electronic technology will connect small-scale power sources such as photovoltaic, wind power and fuel cell into the grid. The active and reactive power generated by distributed generation changes greatly in case of grid failure, and it is lack of coordination with the existing emergency control measures, which threatens the safe and stable operation of the grid. An emergency control strategy for power system transient stability considering distributed generation is proposed. Based on the offline calculation and on-line correction of the emergency control strategy, the process of the distributed power participating in the transient emergency control is divided into three stages: the active regulation of the distributed power, the correction of the emergency control strategy and the additional strategy in turns. This method gives full play to the fast support ability of the distributed generation to the power grid after the power grid fault, and improves the economy of the emergency control measures on the premise of ensuring the safe and stable operation of the system after the fault. The effectiveness of the proposed method is verified by the simulation of the actual power grid connected to the distributed generation.