A novel approach to adaptive active relay protection system in single phase AC coupling Off-Grid systems

•Analysis of failure states of real-operated Off-Grid system was carried out.•A novel Adaptive Active relay protection system for Off-Grid systems is proposed.•A security and reliability of the Off-Grid power systems was enhanced.

This research paper presents an Adaptive Active Relay Protection (AARP) system for the failure state and abnormal operation states, such as short-circuits and overloads, in single phase Off-Grid systems. This proposed AARP system is intended for an Off-Grid system which contains several independent sources of short-circuit power and is able to change and configure itself for various operation states in the Off-Grid system. Moreover, the proposed AARP system is based on central control and real-time analysis of data acquired from electronic measuring devices. Presented paper includes a theoretical analysis and the experimental work is confirmed in practice.