What is load frequency control?

A simple way to understand Load Frequency Control (LFC) is to think of it like a production line. If consumer demand is high and you don’t increase production accordingly, then production will fall behind. If customer demand decreases and you don’t adjust, you have the problem of overproduction.

In a power system, "load" refers to the total electricity demand from consumers, while "frequency" refers to the stability of the system, typically measured at 50 or 60 Hz.
If the load (demand) increases or decreases, then the power plant must adjust the output (production) to maintain a stable frequency.

Load Frequency Control is a mechanism for continuously monitoring the frequency and adjusting the output to ensure the system remains stable. This helps prevent outages, equipment damage, or inefficiencies, ensuring that the electrical grid operates smoothly and reliably.

Why is LFC important for manufacturers?

Power stability is crucial in manufacturing plants. If power goes down, it can have huge implications on productivity (and profits).
But it’s not just power outages that cause problems. Frequent power surges or lags can cause:

•  Damage to sensitive electronic components
•  Data loss and corruption
•  Equipment malfunction and downtime
•  Calibration and precision issues.
•  Increased maintenance and repair costs
•  Safety hazards for workers
•  Production disruptions and delays
•  Disruption to interconnected systems

And this is why Load Frequency Control is important. By helping to maintain a stable frequency on the local grid, LFC ensures you experience fewer disruptions, such as power outages, surges or sags.

Maintaining a consistent frequency reduces the risk of equipment malfunction or degradation, extending the lifespan of your machinery.

How can manufacturers improve power stability?

While the national grid does have good systems in place for LFC, manufacturers can take their own measures to improve power supply and stability.

Monitoring systems and data collection: Install sensors and smart meters to monitor energy usage and frequency fluctuations. This can help you make adjustments quickly to maintain balance and allow for automated responses to frequency changes.

Integrate local energy sources: If your facility has on-site power generation (like solar panels, wind turbines, or diesel generators), integrate these into your LFC strategy. These sources can be ramped up or down based on frequency needs, reducing the strain on the grid and ensuring stable operations.

Battery energy storage systems (BESS): Battery storage allows you to store power when there is low demand on the grid to be used when demand is high. This reduces your reliance on the grid and helps reduce demand on the grid during peak times.

Reduce energy consumption during peak times: Rescheduling non-critical processes to off-peak times and automating load shedding can help manage load, support grid stability and reduce costs during peak times.

Collaborate with utility providers: Many energy providers offer incentives for reducing energy consumption or exporting excess power during peak times. Speak to your energy provider about how you can help support grid stability.

Surge protectors: Surge protection devices, such as surge suppressors, can help mitigate the risks associated with power surges. These devices should be installed at critical points in your electrical distribution system.

Voltage optimisation: Electrical equipment is designed to run at the most efficient levels, but poor control over the incoming voltage (and tolerances) reduces efficiency. Voltage optimisation manages the voltage coming in and ensures the correct voltage is used and distributed to maximise efficiencies.

Power factor correction (PFC): PFC reduces the load on the electrical distribution system and increases energy efficiency. It also decreases the risk of instability and equipment failure. The most common way to achieve PFC is through the addition of capacitors in parallel to the load. Static PFC can be applied at each individual motor, at the distribution board, or at the origin of the installation.

Uninterruptible power supply (UPS) systems: UPS systems provide backup power during voltage fluctuations, power outages, and surges. They safeguard against immediate disruptions and give you time to shut down equipment or switch to alternative power sources safely.

Control and automation: Control and automation systems allow you to manage your production lines more effectively and provide real-time data about power fluctuations and voltage optimisation.

Working with AES

At AES, we specialise in electrical contracting services for manufacturers. If you haven’t got a strategy in place for managing your electrical installations, we can help.

As well as proactive and reactive maintenance, we offer a range of specialist services to help you reduce downtime, improve power stability, and increase energy efficiency:

• Voltage optimisation
• Power factor correction
•  Variable speed drives
•  Energy-efficient lighting
•  Battery Energy Storage Solutions (BESS)
•  Uninterrupted Power Supply (UPS)
•  Testing and inspecting any electrical installations
•  Electrical vehicle charge points
•  Solar installation
•  Smart controls
•  Control and automation systems

AES personnel are also CompEx accredited to work in ATEX areas.

If you’d like to learn more about how AES can keep your factory operating efficiently, get in touch with our expert team.