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. 2019 Mar 7;21(3):257. doi: 10.3390/e21030257

Figure 5.

Figure 5

Performance of PID controllers with and without adaptation of the gains based on the minimisation of free energy. The integral absolute error (IAE) is used to measure the effects of the oscillations introduced by a single load disturbance at t=150 s (see text for the exact definition of the IAE).