FGI Energy Storage Emergency Power Comprehensive Solution
Under the guidance of the "dual carbon" goals and in the context of continuously rising energy costs, the demand for energy conservation and consumption reduction in all industries is becoming increasingly urgent. The energy storage emergency power supply system meticulously crafted by FGI for coal mines has become an innovative model in the field of coal mine energy management with its outstanding performance. It can not only serve as an emergency backup power source when the dual power supply in the coal mine is cut off, ensuring the continuous power supply of important loads in the coal mine, but also reduce electricity expenses through the "peak shaving and valley filling" strategy. At the same time, it can intelligently adjust the operating frequency of the fan, achieving remarkable energy-saving and consumption-reducing effects.
The framework of the energy storage emergency power supply system mainly includes energy storage converters (PCS), batteries, battery management systems (BMS), energy management systems (EMS), as well as auxiliary systems such as temperature control, fire protection and video surveillance.
The framework of the energy storage emergency power supply system mainly includes energy storage converters (PCS), batteries, battery management systems (BMS), energy management systems (EMS), as well as auxiliary systems such as temperature control, fire protection and video surveillance.
2. Types of energy storage emergency power supplies
At present, there are three types of energy storage emergency power supply systems applied in coal mines: cascade storage emergency power supply systems, variable frequency energy storage emergency power supply systems, and low-voltage energy storage emergency power supply systems. Each type of technical topology has its own characteristics.
(1) Graded reserve energy emergency power supply system
The cascade storage emergency power supply system is a solution where the energy storage output voltage directly reaches the power supply of the coal mine busbar. The emergency power supply system is connected in parallel to the power supply busbar of the coal mine. Its technical topology scheme is shown in the following figure.
Feature of the solution:
Each battery cluster operates independently, and all cells are under control.
The cascaded energy storage system has an efficiency increase of over 3% compared to the low-voltage system.
The output harmonic content is low, the power quality is good, and the response speed is fast.
The professional operation and maintenance of the transformer in the energy storage system is reduced.
(2) Variable frequency energy storage emergency power supply system
The variable frequency energy storage emergency power supply system is a solution that integrates variable frequency technology and energy storage technology. The emergency power supply system is connected in series to the key loads in coal mines to achieve emergency power supply within seconds. Its technical topology scheme is shown in the following figure.
Feature of the solution:
The emergency power supply switching is fast, enabling seamless grid connection and disconnection switching. The time for establishing the grid after power loss is ≤ 5 seconds.
It can achieve rapid reverse ventilation function, with the reverse ventilation time ≤ 5 minutes.
It can realize the one-click automatic grid connection and charging/discharging function during long-term idle state.
It can achieve fault conversion to mains frequency and variable frequency speed regulation functions.
(3) Low-voltage energy storage emergency power supply system
The low-voltage energy storage emergency power supply system is a solution that boosts the voltage to the power bus of the coal mine through a transformer. The emergency power supply system is connected in parallel to the power bus of the coal mine through a transformer. Its technical topology scheme is shown in the following figure.
Feature of the scheme:
The architecture is simple, and there is a large amount of energy storage capacity for new energy.
The batteries are connected in multiple clusters in parallel, resulting in circulation.
The power of the single PCS unit reaches 2.5MW.
