There are many problems with traditional centralized power service restoration method

such as wide information interaction range and lots of calculation

so a distributed power service restoration method based on smart terminal unit is proposed. This paper describes the structure and function of distributed power service restoration system with the smart terminal unit as the core

which can use peer to peer communication to exchange information. On this basis

the implementation of distributed power service restoration method including two parts of distributed topology search and service restoration control is put forward. First of all

the distributed method is used to search for the out-of-service area. Then

the scope of the actual restoration is determined based on adverse searching method and constraint conditions. Finally

considering the characteristics of distributed generation and constraints

the islanding scope is determined. The simplified calculation method of the constraint conditions is proposed

which is compatible with the topology search process of distributed service restoration and is based on stepwise Thevenin equivalent. The power

voltage and branch power flow constraints are carried out in the search process of the restorable area without the need for centralized power flow calculation. Furthermore

the effect of the branch is discussed and the method is improved. Finally

one case study is given to validate the proposed method.