Method and system for power distribution network area protection

Abstract

The invention provides a method for power distribution network area protection. Area protection is achieved on a power distribution network, the power distribution network comprises a master transformer substation, a slave transformer substation and a plurality of connecting switches, and the connecting switches are connected to a line between the master transformer substation and the slave transformer substation in series. The method comprises the steps that the current operating mode of the power distribution network is determined; under the current operating mode, a fault point generated when the line between the master transformer substation and the slave breaks down is acquired, the current operating state and the corresponding communication state of each connecting switch are acquired, a controllable connecting switch corresponding to the fault point is obtained according to the current operating state and the corresponding communication state of each connecting switch, a corresponding protection strategy is further started, the controllable connecting switch corresponding to the fault point is controlled to act, and power distribution network area protection is achieved. According to the method, the method can be suitable for various grid structures and different system operating modes, fault locating is automatically achieved, the number of protection actions is reduced, the speed of network reconstruction can be increased, and network reconstruction time can be shortened.

Description

technical field [0001] The invention relates to the technical field of distribution network fault processing, in particular to a method and system for area protection of a distribution network. Background technique [0002] Distribution automation is an important part of the smart grid, and its core is distribution network fault handling, which is of great significance for improving power supply reliability, expanding power supply capacity and realizing efficient and economical operation of the power grid. The traditional current protection principle is based on the voltage and current detection of independent units. The coordination between protection depends on the action current setting and the corresponding delay, and does not care about the protection action of adjacent switches. In the case of multi-level switches running in series, the position and operation mode of tie switches are often changed, and a large number of distributed power sources are connected to the di...

AI Technical Summary

Problems solved by technology

But the disadvantage is that a highly reliable communication system and computer hardware and software system are required. Once the communication is interrupted, the entire reconstruction plan will fail, and it will take a long time to restore power supply

[0008] The advantage of this mode is that it no longer depends on a single "smart" center at the master station to handle every small fault that occurs on site, even if the communication between the data acquisition and control system is interrupted, it will not affect the fault processing and restore power supply, At the same time, it can realize automatic fault location, improve the speed of network reconfiguration, and reduce the time of network reconfiguration, but the disadvantage is that it needs switch trial and closing to locate the fault. Once there are too many protection actions, it will have a certain impact on the line.

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