The simplifying partition algorithm of reliability evaluation to complicated medium voltage power distribution grid

Combining with the characteristic of medium voltage power distribution grid, this paper puts forward a simplifying partition algorithm of reliability evaluation to medium voltage power distribution network. At first, the system is simplified; branch sub-feeder is made to be equivalent to an element, so the system is simplified. Then the construction method of adjacency matrix is presented. Finally, the partition algorithm of power distribution network is come into being. Considering that the common tree operating of medium voltage distribution network, so the adjacency matrix is stored by making use of sparse technique. During the fault is analyzed and simulated, the fault enumeration time and repeated searching time of switching element is saved greatly. Reliability evaluation has been taken on the bus of the testing system RBTS-4 presented in the literature by applying the algorithm, and the calculating example has shown that the algorithm has high efficiency and engineering practicability.