Set-point tracking of a dc-dc boost converter through optimized PID controllers

Controlling a boost converter having a right-half-plane zero in its transfer function as compared to a buck converter is a difficult task to accomplish. This paper suggests the optimization of the traditional proportional-integral-derivative (PID) control algorithms for the boost converter through the unconstrained nonlinear optimization technique. This reduces the labor for finding out the well-tuned PID controller parameters for nonminimum phase plants like boost converter. Firstly, the Ziegler-Nichols improved open-loop step response method and its variants and the closed-loop step response method are employed to get the nominal values of PID parameters. Secondly, the parameters are further tuned using the unconstrained nonlinear optimization technique to boost the performance of the compensated system. MATLAB/Simulink results are provided to compare the performance of the conventional and the optimized PID controllers.