FGI Achieves Breakthrough with 5MW/20MWh Aqueous Organic Flow Battery Commercial Launch

Project Overview

Recently, FGI successfully delivered a 5MW/20MWh aqueous organic flow battery energy storage system, equipped with a 5MW boost-integrated unit, achieving one-time grid connection in Ordos, Inner Mongolia. The project has obtained the official approval from the Inner Mongolia Power Dispatch and Control Company for completing the trial run of an independent new-type energy storage system. It has not only been successfully connected to the Inner Mongolia spot electricity market, but has also officially entered the commercial operation stage, marking a significant milestone in the practical deployment of this energy storage project.

This project integrates a 195MW lithium iron phosphate (LFP) battery system with a 5MW aqueous organic flow battery system, forming an independent grid-side energy storage system with a total capacity of 200MW/800MWh. Notably, this is the world’s first MW-level application of an aqueous organic flow battery, a breakthrough with milestone significance for the global energy storage industry.

System Solution Highlights

The 5MW boost-integrated unit adopts a modular design, consisting of two 2.5MW units operating in coordination to deliver stable and efficient power output. To ensure the reliable startup of the aqueous organic flow battery, each 2.5MW unit is equipped with a dedicated 100kW DC/DC converter, designed for the 0V activation process of the flow battery. By precisely regulating voltage, the system ensures smooth transition from the initial state to normal operation, providing a solid foundation for efficient system performance.

Leveraging its expertise in power electronics, FGI has developed a tailored solution for aqueous flow battery energy storage with the following features:

1. Flexible 0V activation options – Multiple activation methods can be selected according to flow battery characteristics, making battery regeneration simpler and more convenient.
2. Dedicated PCS for flow batteries – Fully compatible with flow battery BMS, achieving one-time grid connection at MW scale.
3. Robust thermal design – Operates without derating at ambient temperatures up to 45°C, ensuring reliability under sand, heat, and extreme cold.
4. Long lifecycle – Supports 20,000 deep discharge cycles with a design lifespan of up to 25 years, significantly reducing maintenance costs and replacement frequency.

FGI PCS Technology Advantages

• Fast islanding detection technology
• LVRT & HVRT (Low/High Voltage Ride-Through) capability
• Peak shaving and valley filling functionality
• Reactive power compensation & harmonic suppression
• Constant power and constant current charging/discharging modes
• Multi-machine parallel operation, scalable to MW-level systems

FGI 100kW DC/DC Technology Highlights

1. Full-stack in-house development – Mastery of topology design, thermal simulation, and intelligent control technologies
2. Rigorous validation – 67 reliability tests including salt spray, vibration, and high/low temperature cycling
3. Fast response – Supports rapid customized design and development, with lifetime O&M services provided

Project Value and Significance

Once commissioned, the project will:

• Enhance renewable energy integration capacity in the surrounding region
• Alleviate transmission pressure of renewable power export
• Improve grid flexibility and supply reliability
• Strengthen grid stability and safety

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Furthermore, it provides a demonstration model for large-scale wind and solar integration, offering strong support for the construction of a new-type power system and promoting the sustainable and rapid development of renewable energy.