Planning & application of distance relays coordination for IEC microgrid considering intermediate in-feed factor

The conventional over-current protection schemes depend on current magnitude detection are inefficient to protect microgrid consisting dispersed Distributed Generation (DG) and dispatched non-linear communities. Distance protection considered among the reliable solutions for microgrid protection, due to its insignificant influence by the variance in the power flow in the microgrids and island mode operation and the weak nature of inverter-based DG's. This paper presents a new adaptive distance scheme for calculating the preset parameters based on the operational topology and the location of distributed generation. Accordingly, adaptive adjustment for a new predefined configuration takes place. The network divided into manageable sections, the measurements of voltage and currents were pre-calculated for each operating topology, and various fault situations were extensively simulated for radial and meshed topology in macrogrid and microgrid mode of operation. The simplified simulated network implemented in NEPLAN represents a standard IEC microgrid model. The comprehensive results show the reliability of the proposed adaptive relaying scheme in providing an effective protection measure for secured microgrid operation.