Solution of using battery energy storage systems for power transmission congestion of Ninh Thuan - Binh Thuan power grid

Abstract Currently, in order to reduce CO2 emissions to combat climate change as committed at the COP 26-27-28 conferences, many countries around the world, including Vietnam, are strongly transitioning from traditional energies to renewable ones. The development of renewable energy (RE) sources such as wind and solar power contributes not only to supplement and diversify the electricity sources but also to enhance the national energy supply security. However, the rapid and concentrated development of RE sources in some areas causes many disadvantages in the operation of Vietnam power system. Especially, this overdevelopment puts more pressures on the weak interconnected transmission infrastructure of the system. As a result, many RE power plants are forced to reduce their outputs, and hence they cannot feed the full capacity into the power grid. Ninh Thuan - Binh Thuan is a particularly notable area where the local electricity demand is very low while many RE sources have been putting into operation in recent years. As the power system in this region is expected to develop with a high proportion of RE in the future, the negative impact of RE on the transmission is inevitable. To handle this unexpected situation, this paper focuses on studying the impact of RE on the power system in Ninh Thuan - Binh Thuan region by 2025. In this research, the power flow analysis over the time is carried on to identify the overloading locations on the power grid. The solution of using battery energy storage systems (BESS) for Ninh Thuan - Binh Thuan power system is then validated on the analysis platform of ETAP 22.5. The obtained results show that the use of BESSs with reasonable powers, capacities and locations can ensure the stable, safe and reliable operation of the power grid.