Load margin and stability analysis of power-gas interconnection system considering N-1 and power flow transfer prediction

In view of the influence of N-1 disconnection on the maximum load margin and system stability of power-gas interconnection system, a continuous power flow model of power system and natural gas system considering the dynamic piping characteristics of natural gas was established. Based on the increase of system load, the system N and N-1 load margin of power system and natural gas system is calculated by SRSM continuous hybrid power flow. The power flow transfer factor after N-1 branch of the electric-gas interconnection system is defined, and the power flow transfer is predicted for the system so as to obtain the off-limit branch of the system. The weak nodes and EH coupling degree of the power system, natural gas system and electric-gas coupling link under the electric-gas coupling are further evaluated.