Fig. 5
From: Burden on hydropower units for short-term balancing of renewable power systems
Strength payments based on the strength obtained from the −0.1 Hz frequency step change and a −0.05 Hz frequency step change. For each frequency change case, the relative values are normalized with the respect to the strength under Ep1 and S1 for HPP 1. a For HPP 1; b For HPP 2
