A wide variety of nonlinear phenomena, such as bifurcation and chaos, have been observed in power electronics converters. Much research has been conducted on these behaviors in different converter topologies. The Buck converter is known to exhibit chaotic behavior in a wide parameter range, giving rise to instable behaviors depending on the circuit parameters values. This paper investigates this bifurcation behavior by varying the parameters of a voltage PI controlled Buck converter operating in continuous conduction mode, using a continuous-time model and constant frequency control signal. Furthermore, a novel and improved version of the PI compensation technique, designed using the multi-objective grey wolf optimizer, is proposed to stabilize the Buck converter from chaotic state to periodic orbit.