In order to assess the reliability of large scale and complex distribution system,this paper analyzes the distribution network topology and proposes a new algorithm for the reliability assessment of large scale and complex distribution system using fault associate matrix,based on the Failure Mode and Effect Analysis method.

However,software failure dependency,the differences of testing environment and operational environment are not considered by most SRGMs.

Furthermore,a fault matrix deduced from that model can resolve the problem that the numbers of measurable parameters are not enough to acquire the performance parameter.

According to this approach, the product is firstly, divided into a set of functional units the dependency matrix between the function units are then defined.