How to optimize the sizing of the Battery Energy Storage System for the Hybrid System

The EVNPECC4 company used ETAP software for modeling and calculations to meet Phu Quy's load demand and optimize the use of renewable energy sources in the future. The case study proposes to investigate the capacity of the Battery Energy Storage System (BESS) selection to support Phu Quy's hybrid power system, which stores electrical energy and reduces the output capacity of the Phu Quy diesel power plant.
Mr. Huynh Kim Long, Power system calculation engineer, EVNPECC4

The integration of Battery Energy Storage Systems improves system reliability and performance. This case study demonstrates how the EVNPECC4 company utilized ETAP to size the Battery Energy Storage System (BESS) for the Phu Quy Island electrical distribution network. Plans involve installing additional wind and solar power plants to meet increasing load demands on Phu Quy Island. However, due to renewable energy's dependence on weather conditions, the diesel power plant remains crucial, prompting a study on the optimal size of Battery Energy Storage Systems (BESS) to support the integration of renewable energy and optimize costs.

Power Engineering Consulting Joint Stock Company 4 (EVNPECC4), formerly known as Southern Power Planning and Designing Sub-Institute, was founded in 1976 with the mission of renovating, restoring, and reconstructing the power system for Southern provinces to meet people’s living needs and restore the post-war economy. Nowadays, EVNPECC4 has become one of Vietnam's leading power engineering consulting companies. With over 48 years of experience in the field of power engineering consulting, EVNPECC4 has successfully designed for more than 1,000 power grid projects with voltage up to 500kV; more than 500 hydropower, thermal power, and renewable projects stretched along the country, including technical infrastructure, civil and road-bridge projects.

Location: Nha Trang City, Khanh Hoa Province, Vietnam

Year: 2023

Choose the optimized size of the Battery Energy Storage System

Challenges

  • Find a tool and create a power system model for Phu Quy Island.
  • To make electrical calculations for power system studies and energy balance with many electrical energy sources.
  • To size and choose a Battery Energy Storage System according to wind and sun energy fluctuations forecasts while limiting diesel energy.
  • To reduce fuel energy spending and costs. Renewable sources should mainly produce electricity.

Which solutions did they choose?

Selected applications

They chose the ETAP modeling software with Load Flow Analysis Software, with ETAP µGrid™, ETAP DERMS™ and Automatic Battery Management Systems (BMS) actions during network analysis including ETAP eTraX™. ETAP Digital Twin is the leading solution.

ETAP ensured compliance with all electrical standards needed to design and calculate the BESS, and Renewables electrical installations.

Why do they use ETAP?

Main Customer Benefits

  • Valuable digital modeling of the system, including wind turbines, solar panels, diesel generators, connections, and locations, is available.
  • Easy creation of intelligent single diagrams of the actual Electrical Power System, with easy management of different electrical data and other energy production scenarios. Easy modeling of developed networks for the future using ETAP models.
  • Optimized BESS power rating calculation according to the challenges and energy production evaluation. 
  • Choosing the right battery technology, with the calculation of costs and savings.
  • Decreasing the cost of diesel energy.
  • The Electrical Transient Analysis Program (ETAP) guarantees high-quality calculations.

What do they think about ETAP?

Opinions

Thanks to the ETAP software, which calculates load flow results in the time domain, we can determine the total power surplus in 2025.
Mr. Huynh Kim Long, Power system calculation engineer, EVNPECC4

We chose lithium-ion technology. The ETAP model indicates that it is the most cost-effective and environmentally friendly investment.
Mr. Huynh Kim Long, Power system calculation engineer, EVNPECC4



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Optimization of Battery Energy Storage System Sizing for Hybrid System in PHU QUY Island

To meet increasing load demands on Phu Quy island, plans involve installing additional wind and solar power plants, yet due to renewable energy's dependence on weather conditions, the diesel power plant remains crucial, prompting a study on the optimal size of Battery Energy Storage Systems (BESS) to support renewable energy integration and optimize costs.


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