Protection assessment method for flexibility of hybrid power system protection improvement: Study case Sumbawa subsystem, Indonesia

Abstract

Indonesia has targeted 23% renewable energy contribution in 2025 power production plan to drive the utilisation of renewable energy potentials spreading in various grid locations. The location and capacity of photovoltaic (PV) have been planned to obtain optimum operation in each area and subsystem. However, PVs' integration challenges reliable protection and flexibility of network for transmission system operator and distribution system operator (DSO) companies, they should be improved to adapt grid and its protection system for such new challenges. This study examines the Sumbawa subsystem as a hybrid power system including PVs according to the energy mixed roadmap in 2025. In the absences of DER, the settings of devices are calculated selectively. The protection security assessment method automatically evaluates the operation of devices in the present network. To validate the protection system, three-phase and single-phase faults are studied at predefined locations. Adaptive rules are developed to correct miscoordinations by proposing new settings and evaluated again by implementing the new proposals schemes. This paper focused is the identification of proper adaptive rules and it is assumed that the schemes are transferred to devices using utility workforces with manual or automated workflow based on proper communication infrastructure.