FGI Provides Energy Storage Backup Power System for Intelligent Coal Mining Project in Northeast China

I. Introduction
A key state-owned coal enterprise in Northeast China, historically known for operating the first mechanized, electrified, and modernized large-scale open-pit coal mine in the country—and once the second largest in the world and the largest in Asia—has been a pioneer in China’s coal industry electrification.

In recent years, this mining group has actively advanced its strategy for fully intelligent coal mining and accelerated the construction of a “Smart Mine.” FGI supported this initiative by supplying a fixed energy storage emergency power system for the group's materials company. The project features a 6kV 4MW/4MWh lithium iron phosphate (LFP) battery system, with an output voltage of 0.69kV. Through a 0.69kV/6kV isolation step-up transformer, the system is connected to the mine’s 6kV power grid.

II. Operating Modes

1. Grid-connected Peak Shaving and Valley Filling Mode:
Reduces load fluctuations on the grid. Charges during off-peak and mid-peak periods, discharges during peak and critical peak periods, lowering the enterprise's electricity costs.

2. Grid-connected Load Smoothing Mode:
Gas generator sets are highly sensitive to load fluctuations. The energy storage system helps stabilize the load curve, enhancing power quality.

3. Off-grid Emergency Power Supply Mode:
Operates independently from the grid to supply critical loads during power outages.

4. Off-grid Gas Power Station Support Mode:
Supplements the limited capacity of gas generator sets, providing extended backup power during grid failures.

III. Project Highlights
This project features the following key advantages:

• Direct PCS off-grid parallel output ensures power supply for critical mining loads.

• Seamless startup and operation of major equipment such as main ventilation fans, hoists, and drainage pumps.

• Over 4 hours of stable joint operation with gas generator sets during emergency mode.

IV. Conclusion
FGI’s energy storage emergency power system has proven to be mature and internationally advanced. It ensures fast, stable, and continuous power for critical loads during grid outages in coal mines, significantly reducing safety risks and accident probability. The system greatly enhances emergency power supply and disaster resilience in mining areas, offering substantial economic and social value with broad potential for nationwide application.

Production Base: Jincheng Road, Economic Development Zone, Wenshang County, Jining City, Shandong Province, China

Email: overseas@fengguang.com