Using Battery Energy Storage Systems (BESS) for Reliable Backup Power
Introduction
Certain equipment, such as pumps in water utilities, require rapid power restoration, typically within a few seconds, to prevent service disruptions or damage. Traditional diesel or gas-powered generators take longer to start and supply power, leading to delays in restoring critical services.
Battery Energy Storage Systems (BESS) provide a faster, cleaner, and more efficient backup power solution. They can supply power to either permanent or temporary power supplies, bridging the gap instantly during outages by acting as the primary power source. This rapid response ensures critical loads are supported immediately, avoiding costly downtime.
How BESS Supports Critical Loads
When a power outage occurs, the BESS takes the load for a short period, allowing an alternative power source to be introduced or for the system to be safely shut down. BESS also helps maintain essential power quality parameters such as frequency and voltage regulation, which are crucial for the proper functioning of sensitive equipment. This results in a stable and resilient power system, reducing the risk of service disruptions.
Key Sectors Benefiting from BESS Backup Power
- Utilities: Pump stations in sewage and wastewater management are essential to prevent overflows and maintain sanitation.
- Construction, Services, and Contracting: Critical equipment such as lifts and safety systems need to remain operational to ensure safety and efficiency.
- Manufacturing: Continuous power is vital to avoid production interruptions.
- Petrochemicals: Reliable power is critical for safety and process control.
Benefits of Using BESS for Backup Power
- System Resilience: Instantaneous power supply during outages.
- Frequency and Voltage Regulation: Maintains power quality for sensitive loads.
- Power Factor Regulation: Improves overall electrical efficiency.
- Lower Fuel Use: For unreliable grid sites, the battery backs up the load until the generator starts, reducing fuel use by keeping the generator off most of the time leading to high fuel savings. For off-grid sites, the battery improves generator efficiency.
- Reduced Emissions: Cuts CO2 and other pollutant emissions by minimising generator use.
Real-World Examples of BESS Backup Power
Example 1: Remote Sewage Site Protection
A customer operates a sewage site in a remote location with frequent power cuts, causing control systems to trip and pumps to shut down. This leads to sewage overflow into a local river, risking pollution and fines. The site only becomes aware of outages after overflow begins.
Traditional Solution: A 200 kVA generator running 24/7, which is inefficient during low demand periods.