Battery energy storage systems reinforcement control strategy to enhanced the maximum integration of PV to generation systems

Java Bali area has high potential of renewable energy resources (RES) especially for photovoltaic (PV) energy which can supply the power system electricity. However, the PV generation has intermittent characteristic, which in may disturb the power system operation. The disturbance is related to the system technical minimum load (TML) and system ramping capability. For that purpose, the maximum size of PV generation should be determined and regulated since it depends on generating unit size and type. The regulation can be realized using the reinforcement of battery energy storage system (BESS) which can provide the system flexibility, frequency regulation and energy management. The method to determine maximum penetration level of PV penetration is proposed in this research, which is based on the unit commitment (UC) procedure. The BESS facilities are also included as the technology option which can provide more flexibility. The proposed method will determine penetration level, periodically committed generating unit, dispatched generating unit, BESS charging and discharging status. The method is simulated in simplified Java Bali System under three different period that are weekdays, weekend and lowestday scenario having different demand and peakload combining to BESS facilities as the options. The result shows that under BESS reinforcement the PV integration are 49%, 35% and 23% during weekdays, weekend and lowestday, respectively. On contrary, without BESS reinforcement the PV integration are only 45%, 31% and 17%.