Design of Robust PID Controller for Improving Voltage Response of a Cuk Converter

Power electronics based cuk converter finds many practical and industrial applications such as renewable energy systems, hybrid electric vehicle, electronic voltage regulators, etc., to provide required voltage regulation between input DC stage and output DC stage. For the effective operation of all these kinds of practical applications, it seeks a quick and smooth response from a cuk converter along with the regulated DC output magnitude. The converter control is achieved through a closed-loop PID (proportional cum integral cum derivative) controller. Hence, the efficacy of the overall converter depends on how well the PID gain specifications are designed. There are many methods available for the tuning of PID controller gain specifications, but, the identification of better methods is a tedious task. Further, a method identified as best for a given system can’t be generalized as it may not suit for other systems. Hence, a better method for PID tuning has to be identified with respect to each and every system. Keeping this in mind, this paper provides a comprehensive investigation of all the key tuning methods and suggests the best one for cuk converter control with the help of time-domain performance index and frequency-domain stability index. The analysis is done using MATLAB/Simulink software models.