Power supply recovery method of power distribution network comprising distributed power supplies after fault

Abstract

The invention relates to a power supply recovery method of a power distribution network comprising distributed power supplies after a fault. The power supply recovery method is technically characterized by comprising the following steps of (1) splitting the distributed power supply which does not have isolated island operation capability after a large-area power failure condition is caused by the fault of the power distribution network; (2) carrying out isolated island division by using a searching method on the basis of the principle that the distributed power supplies run with surrounding loads, and then enabling an isolated land, with the surrounding load, of the distributed power supply with the isolated island operation capability to run; (3) isolating a fault point and recovering power supply of the remaining sound network; and (4) enabling the distributed power supply or isolated island with a grid-connection condition to run in a grid-connection manner and enabling the isolated land without the grid-connection condition to further run. The effects of the distributed power supplies can be fully developed under the premise of recovering load power supply as much as possible; the important load power supply reliability is improved; meanwhile, the switching action frequency is reduced as few as possible in the power supply recovery process; and the network loss is reduced as much as possible after power supply recovery.

Description

technical field [0001] The invention belongs to the technical field of power distribution automation, in particular to a power supply recovery method after a fault in a power distribution network including a distributed power source. Background technique [0002] At present, when the distribution network containing distributed generation (DG) fails and a large-scale power outage occurs, the distributed generation is generally removed from the distribution network, and then the power supply is restored to the healthy area of ​​the distribution network, and finally the distributed generation is connected to the grid. However, this approach fails to give full play to the function of distributed power to improve power supply reliability. Therefore, when the distribution network fails and a large-scale power outage occurs, the distributed power with island operation capability will operate in isolated islands with surrounding loads, and does not have the distribution of island ope...

AI Technical Summary

Problems solved by technology

However, in the power supply recovery process after the fault of the distributed power distribution network, the distributed power only operates in an isolated island with fixed loads, and does not consider the operation of the distributed power with the surrounding load at its maximum capacity and the process of restoring power to healthy areas. , without considering the network loss and the number of switching operations after the distributed power generation is connected to the grid

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