Application topology recognition method for distribution networks

A method for automatic identification of an application network topology for power distribution network control, which comprises the following steps:

• step 1:
• statically configuring attributes of a switch, in which
• the switch attributes and the application network topology types are statically configured firstly for a power distribution network intelligent terminal STU which corresponds to a power distribution network switch in the power distribution network;
• said switch attributes comprise an inherent attribute and a position attribute of the power distribution network switch, wherein the inherent attribute is classified into a substation outlet switch, a section switch and an end switch;
• the position attribute of the switch is a position of the switch in the network, together with network addresses of power distribution network switches adjacent to said switch;
• step 2:
• determining, by the power distribution network intelligent terminal STU, whether a query trigger condition is satisfied, in which
• the power distribution network intelligent terminal STU determines whether the query trigger condition preset by itself for a real-time application network topology is satisfied, and if the query trigger condition is satisfied, then step 3 is carried out, and if the query trigger condition isn't satisfied, then a query is not initiated;
• step 3:
• sending, by an inquirer, a query command to initiate a query into the application network topology, in which
• any power distribution network intelligent terminal STU in the power distribution network corresponding to a power distribution network switch can be used as the inquirer that sends a query command for querying the application network topology to an adjacent power distribution network intelligent terminal STU, wherein the query command is passed level by level down until a terminal switch is encountered;
• step 4:
• replying to the query command, in which
• after receiving the query command for querying application network topology, a power distribution network intelligent terminal STU corresponding to the terminal switch sends its respective switch attribute information back to an upper level power distribution network intelligent terminal STU having sent the query command for querying application network topology, and
• the present level of power distribution network intelligent terminal STU, after receiving the switch attribute information sent from a lower level of power distribution network intelligent terminal STU, sends its switch attribute information along with the received switch attribute information from the lower level back to the upper level of power distribution network intelligent terminal STU, and refills data length check code, until the switch attribute information is sent level by level to the inquirer sending the command for querying application network topology;
• step 5:
• receiving the switch attribute information of power distribution network switches, in which
• step 6 is carried out after the inquirer receives the switch attribute information of all power distribution network switches in the power distribution network;
• step 6:
• checking an integrity of the switch attribute information, in which
• the inquirer checks the integrity of all switch attribute information which should have an end as a terminal switch, wherein if all switch attribute information is complete, then step 7 is carried out;
• if not, which means the query fails, then step 2 is carried out again;
• step 7:
• forming an application network topology, in which
• the inquirer extracts its required topology information from the received switch attribute information of all power distribution network switches according to its application network topology so as to form an application topology network;
• said application network topology comprises a position application topology, a load pre judgement application topology, an application topology for automatic identification of tie switches, and an application topology for tracking a main network power source for islanding protection;
• wherein power distribution network control is performed based on said application network topology.