Utilization of L-index in microgrid interconnected power system network

This paper proposes the application of a novel voltage stability index computation scheme to microgrid (MG) interconnected power systems. The L-index provides an online mechanism for computing and rating the status of the interconnected system into the utility-supplied, pre-microgrid, microgrid-supplied and island operational modes for improved operation. It may also provide a triggering signal to control the point of common coupling (PCC) converter to reduce network voltage violations in situations where the MG system has the capability to inject reactive power to the grid during periods of emergency or peak loads. Simulation results obtained with IEEE 14 bus system with MG later connected to load bus twelve as a PCC to the microgrid system, showed the suitability of the developed model towards providing smooth operation under both normal and distressed conditions.