Protection scheme developing method for active power distribution network with distribution generation

Abstract

The invention discloses a protection scheme developing method for an active power distribution network with distribution generation. The method includes the steps of firstly, determining the type of a to-be-protected circuit; secondly, configuring the main protection and backup protection of the to-be-protected circuit and upper circuit and lower circuit of the to-be-protected circuit; thirdly, configuring master backup protection; fourthly, judging whether secondary protection equipment and communication are good or not, if so, entering the fifth step, or else entering the seventh step; fifthly, determining the cooperative relationship of the main protection and the backup protection; sixthly, determining cooperative relationship between the master backup protection and the main protection and between the master backup protection and the backup protection; seventhly, processing the abnormality of the secondary equipment and the communication. The method has the advantages that traditional stage type protection is improved and developed, fast development control and information and communication technology are combined, the main protection is intensified and the backup protection is flexibly configured, and accordingly protection suitable for the active power distribution network with the distribution generation is achieved.

Description

technical field [0001] The invention relates to a method in the technical field of distribution network relay protection, in particular to a method for formulating an active distribution network protection scheme including distributed power sources. Background technique [0002] With the development of the economy, the user side has higher and higher requirements for power supply reliability, and the power supply radius of the distribution network is becoming smaller, and it is becoming more and more difficult to coordinate the selectivity and sensitivity of the line protection setting value, and the line protection also needs to keep pace with time. Combining the development of electronic technology and communication technology, control technology, etc., innovations are made in configuration methods and setting strategies. The rapid development of 4G wireless and other communication technologies has brought opportunities for distribution network relay protection. [0003] F...

AI Technical Summary

Problems solved by technology

[0003] For the power distribution system with distributed generation (DG), due to the randomness of its power output, it will make it difficult to set the value of the traditional current protection

In order to ensure its reliability, the traditional protection configuration has to be configured and adjusted according to the most severe situation. In order to ensure its selectivity, the rapidity and sensitivity of the backup protection are sacrificed; and the traditional backup protection only uses local information and considers the existing backup protection. The composition mode of functions has been stretched to solve the problem of adapting to the changeable network topology and operation mode. Considering the randomness of distributed power output, traditional backup protection can no longer meet the requirements, and even played a role in fueling the system crash.

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