Fractional-Order 𝑃𝐼 Control of First Order Plants with Guaranteed Time Specifications

Figure 4

Frequency specifications volumes for 𝑃𝐼^𝛼, 𝐼𝐼^𝛽, and 𝐼^𝛼𝐷^1−𝛼 controllers.

(a)

(b)

(c)