DETERMINATION OF BATTERY ENERGY STORAGE SYSTEM SIZING FOR HYBRID POWER SYSTEM IN PHU QUY ISLAND

Abstract

Currently, Phu Quy Island is being supplied by three power sources: a diesel plant, a wind power plant, and a solar power plant with capacities of 10 MW, 6 MW, and 0.8 MW respectively. The load is expected to achieve a capacity of 8.4 MW in 2025, and 14.9 MW in 2030. With the high increase in load demand, and far from the mainland, the Phu Quy power systems is difficult to get electrical energy from the national power grid. Renewable energy is being extended to meet the high load demand on the Phu Quy island. However, the issues of renewable energy often depend on weather conditions such as solar radiation and the wind’s speed, therefore the diesel power plant is still the main energy supply that causes an increase in the power system operating cost. In order to meet the demand as well as the need for renewable energy using to be optimized in the future, the paper is devoted to determination of the Battery Energy Storage System (BESS) sizing to support Phu Quy hybrid in storage of renewable energy and decrease the operation cost for Phu Quy power system. The installation of renewable energy sources such as wind and solar is difficult to manage, between generation and consumption often has excess and shortage over time. The proposed BESS solution can store energy when there is excess from source and release it to the lines when load demand increases. It’s suitable with the current status of power system on Phu Quy Island, as well as the development trend in the future, especially the COP26 and Power Development Plan VII.