Battery storage for grid ancillary services
Providing Grid Services with a battery system
Historically the electricity supply system is characterised by stable generation and variable loads. However in most countries renewable electricity production is rapidly becoming the cheapest source of electricity. Renewable energy sources have a continuously changing production profile with clouds moving over solar plants or variations in wind at wind turbines.
There is an increasing need for flexibility options to maintain stable grid operations!
Battery energy storage systems to provide primary control reserve
Advantages of a Battery Energy Storage System
- A Battery Energy Storage System (BESS) is able to inject energy into the grid or absorb it from the grid when needed.
- The operational costs of a BESS are low compared to a conventional power station burning gas, diesel or coal to provide primary control reserve. There is very little energy required to operate a BESS.
- Additional benefit is that a BESS is scalable and flexible. Its capacity can always be increased by adding additional storage racks or containers.
- A BESS can be installed in just 6 months, compared to a standard power station dependent on the approval delay and delivery time. It can also easily be moved to another location when required.
- A BESS does not harm the environment.
By introducing a battery storage behind the meter an industrial costumer is able to “optimize” the load curve as to reduce his peaks (peak shaving) and make the profile atypical. Reducing peak load by having the same electricity consumption over an increased number of utilization hours.
Energy Storage to increase flexibility
Unbundling of the energy markets resulted in a separation between generation, transportation and trading of energy. Traders are responsible for maintaining the balance in the grid.
Deviations within the balance cause additional costs. These costs increase the energy bill of all consumers.
Battery Energy Storage Systems provide flexibility for traders, reducing penalty costs. The main benefit of a BESS is that its response time is very short and the energy it provides has very low marginal cost. Also a BESS can act as a negative load, absorbing energy when sudden drops in load occur or a rapid increase in production. This way energy doesn’t get lost.
The operational costs of a BESS are low compared to a conventional power station, providing balance flexibility.