Reclosing method of distribution network with distributed generation based on wide area information

Abstract

The invention discloses a reclosure method involving a distributed generation power distribution network based on wide area information. The reclosure method aims at achieving the technical purpose of guaranteeing the power supply reliability of loads. The reclosure method includes the following steps that directional elements, a circuit breaker and a protector are arranged, reclosure operational motion is set, whether a distributed generation has the isolated island operation capacity or not is judged, and protection and reclosure are conducted. Compared with the prior art, the problem of asynchronous reclosure caused by DG upstream protection maloperation generated by adjacent feeder line faults is solved, operation of switching DG control strategies and splitting an isolated island generated when a DG downstream line breaks down in a reclosure front acceleration protection action mode is avoided, DG control method switching and the action cooperative relationship between reclosure and protection are achieved by fully utilizing the wide area information, the reclosure method can be suitable for the power distribution network with DG access, the DG power supply capacity is brought into full play, the power failure range is reduced, the power failure time is shortened, and the power supply reliability of loads is guaranteed.

Description

technical field [0001] The invention relates to a protection and control method for a distribution network of a power system, in particular to a protection and control method for a distribution network with distributed power sources. Background technique [0002] Distributed generation (DG) is a new type of electric energy, including photovoltaic power generation system, wind power generation system, micro gas turbine power generation system, etc. Distributed power generation has a series of advantages of environmental protection and economy, and can well meet people's requirements for power safety, stability, economy and environmental protection. It has attracted widespread attention and has been gradually promoted and developed. However, the integration of DG into the distribution network system (distribution network, system) also brings new problems and challenges to the protection and control of the distribution network. [0003] The impact of DG access to the distribut...

AI Technical Summary

Problems solved by technology

In addition, the islanding detection method in the prior art mostly adopts the combination of passive islanding detection method and active islanding detection method. By injecting disturbance voltage or frequency to make the voltage or frequency of islanding exceed the allowable range, the DG is cut off from the islanding system. However, these methods go against the original intention of making full use of renewable energy, reducing the scope of power outages, and improving the reliability of distributed power supply, and cannot give full play to the role of DG.

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