Design of Battery Energy Storage System Control Scheme for Frequency Regulation for PV Integrated Power System

The penetration of intermittent renewable energy sources (IRES) will affect the power balance between generation and load, which can disturb the stability of the frequency in the system. Ancillary service that can be used to increase frequency stability due to IRES penetration is a battery energy storage system (BESS). This paper discusses the effect of BESS implementation on the performance of frequency stability due to interference from the generation of IRES. Tests carried out on the IEEE 9 bus system modified with IRES generator in the form of photovoltaic (PV). The control circuit in BESS that is used is virtual inertia control as inertial response (IR) unit and droop control as primary frequency response (PFR) unit. The results show that BESS as a support unit for frequency regulation can reduce the frequency nadir of the system from 49.49 Hz to 49.80 Hz. The rate of change of frequency (RoCoF) value is reduced from 0.270 Hz/s to 0.078 Hz/s. The steady-state frequency value also approaches the reference frequency value of 50 Hz from 49.80 Hz to 49.89 Hz.