Abstract: Modern Digital Excitation control system now started utilizing the power flexibility and cost advantage of Microprocessors for control. Many rotary excitation control system are still using analog type of Automatic voltage regulator which now started to replace with the digital Automatic voltage regulator. Modern Digital automatic voltage regulator is provided with PID controller in the forward path and tuning of PID controller is a challenging task. This paper discusses two methods of tuning PID controller i.e. Pole placement method and pole zero cancellation method. GUI (Graphical user interface) prepared for both the methods on the platform of MATLAB. Using this GUI performance results and time required for tuning for both the methods are compared.