Control power is often also referred to as control energy and acts as a reserve to compensate for fluctuations in the power grid or power frequency. Electricity is both fed into the grid and also taken from the grid. There are two types of control power:
- Positive control energy: Power feed-in to compensate for a network frequency that is too low
- Negative control energy: Throttling of the feed in to reduce the grid frequency
Why do we need control power?
As the number of renewable energies increases, there are higher fluctuations in the power grid because neither sun nor wind are constantly available for production. Of course, every electricity consumer causes load profiles with constant fluctuations. To ensure that electricity does not suddenly fail, electricity producers and electricity suppliers are obliged to provide precise forecasts about their feed-in and withdrawal. The aim is to keep the power grid in Germany stable by providing the most accurate forecast possible.
If a fluctuation does occur because a power plant fails or the weather changes at short notice, the control energy takes effect to compensate for the fluctuation within seconds and avert a collapse.
- power fluctuations are compensated for within seconds or quarter of an hour
- electricity producers, electricity consumers and electricity storage facilities can provide balancing energy