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Problem 3. (15 points) Consider the feedback system in Figure 3, where G(s)1 (s -1)3 Ge(s) G(s) Figure 3: Problem 3 1. Let the compensator be given by a pure gain, ie, Ge(s)-K, K 0 (a) Draw the root locus of the compensated system (b) Is it possible to stabilize the systems by selecting K appropriately? If so, find the range for K such that the closed-loop system is BIBO stable. If not, explain. 2. This time, let the compensator Gc(s) be given by the PID controller Ge(s) = K, + Ai + Kas (a) Find Kp, Ki, and Kd such that the PID controller, when written equivalently as introduces a pair of zeros at z1,2 --11ij. (b) Draw the root locus of the compensated system (c) Is it possible to render the closed-loop system BIBO stable by selecting Kd appropriately? Explain. (d) Discuss, qualitatively, the behavior of the transient response to a step reference input for Ki -> oo and for Kd-> 0

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