fig3
![PEM fuel cell system to extend the stack life based on a PID-PSO controller design](https://image.oaes.cc/a1530c52-0580-440f-bca2-4e9614a70e69/4703.fig.3.jpg)
Figure 3. Transfer function of the proportional-integral-derivative controller.
Figure 3. Transfer function of the proportional-integral-derivative controller.
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