Abstract
Digitalization of substations is universally expanding through digital transformation in existing and new substations. Accordingly, to improve the reliability of operation in digital substations, the requirement is not only expanded for the protection adequacy evaluation on each protection IED but also the constant evaluation of the protection adequacy of the entire digital substation. In general, there is a problem that the state change of the power system is not reflected in protection systems of substations because the protection systems operate without evaluating the protection adequacy of the entire substation after determining the correct value of the protection IEDs. The proposed method in this paper enables the constant evaluation of protection adequacy without additional facilities by applying digital twin technology. In addition, the interoperability of the digital twin model is secured by developing the information exchange between the devices of the digital twin model based on IEC61850.
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