Abstract ▼ AI-Helper

Recently, new problems have arisen as the number of distributed generation connected to power systems has increased.
The role of the protection system in the power system is very important, and the existing protection method can’t solve the problem in the distribution system connected with the ...

Recently, new problems have arisen as the number of distributed generation connected to power systems has increased.
The role of the protection system in the power system is very important, and the existing protection method can’t solve the problem in the distribution system connected with the distributed generation. Therefore, new protection methods are needed to solve these problems.
When a number of distributed generation are connected to the distribution system by Y ground-⊿ connections, if a single line to ground fault occurs, it affects not only the own circuit but also other circuits. The protection relay element in the current distribution system can malfunction due to failure to determine whether the location of the accident is its own circuit or other circuit.
Therefore, in this paper, I propose a new protection method using DOCGR and distance relay to solve the problem.
In PSCAD/EMTDC software, distance relay support internal components for modeling with the master library. Therefore, the distance relay uses the library to implement module, and the DOCGR is not supported, so fortran language is used to implement the module. After implementing each module, I modeled the full system.
I also simulated the setting of the distance relay and the fault resistance. Simulation result show that the protection relay to adjacent lines don’t malfunction when the new protection method is applied by using the proposed DOCGR and distance relay. Therefore, it is confirmed that the new protection method proposed in this paper is valid.

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