Overcoming capacity constraints with BESS through peak shaving
What is peak shaving?
Peak shaving is a strategy aimed at supporting peak power demand when available power is restricted. When it comes to Battery Energy Storage Systems (BESS), this involves storing energy when demand is low and deploying the stored power when demand exceeds the available capacity from the primary power source, whether this be a grid connection or a generator package. In this blog, we investigate how BESS can effectively address capacity constraints associated with limited power availability, making it a valuable tool for ensuring a stable, resilient power supply.
Many facilities and projects encounter peaks in energy demand, driven by factors like time of day, HVACR equipment, heavy duty machinery or motor starts. When power demand surpasses the available capacity, it can lead to equipment malfunctions, decreased production efficiency, or even process disruptions. By integrating BESS into a power system to mitigate these constraints, we can enhance system flexibility, manage demand peaks, improve efficiency, reduce emissions, and optimise energy consumption.
How does this work?
We can talk about peak shaving in two ways.
1. In terms of a hybrid power system, using a BESS to downsize a generator.
2. A limited grid supply, using a BESS to help overcome a limited grid connection.
Peak shaving to downsize a generator package
The Problem: In many projects a generator is sized for large peaks in power, however this means the generator is often oversized for the normal running load of the equipment. The initial peak current drawn would trip a smaller generator so how can we get around this challenge? Take the example of a 750kW chiller, we could use a generator to cover the start up load of 580 amps but the remainder of the time run underloaded.
Aggreko Solution: Aggreko can address this issue by integrating a BESS with a downsized generator, ensuring the efficient operation of equipment such as a 750kW chiller. The BESS, in peak shave mode, allows the chiller to accommodate higher current during start up without the need for an oversized generator.
Benefits: This mode enables the generator to be downsized which immediately gives fuel and emissions saving. It also ensures that when the generator is running, the load is sitting at a higher percentage ensuring a more efficient consumption rate and improve equipment reliability.