Quick reliability estimation algorithm based on ring-radiation network decoupling

The invention discloses a quick reliability estimation algorithm based on ring-radiation network decoupling. The quick reliability estimation algorithm comprises the following steps: constructing an initial power grid topological structure, and eliminating small branch paths so as to obtain a simplified power grid topological structure; decomposing a power grid into a ring network and a radiation network according to the power grid topological structure; performing reliability state sampling on the whole grid by a Monte Carlo simulation method; performing result estimation on a system state obtained by sampling after the reliability state sampling so as to estimate reliability results of a power system; counting the reliability results of the power system to obtain a reliability index of the system. According to the estimation algorithm disclosed by the embodiment of the invention, reliability estimation is carried out on different power grid structures, so that the reliability estimation speed can be effectively increased, and necessary auxiliary decision suggestion can be provided for a power grid planning and operating worker; moreover, the quick reliability estimation algorithm can be applied to estimation on the reliability and the economical property of the power system.