Ding, Chao
(2021)
A new digital PID controller and its applications on DC-DC converters.
MPhil(R) thesis, University of Glasgow.
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Abstract
PID controller is widely employed in industry due to its simplicity and precise control. Lots of PID controllers are based on the pole placement method. However, the pole placement method is complicated for designers. Thus, in this report, a new digital PID controller is proposed to provide a simple PID controller with satisfactory performance. The proportional term is designed to guarantee the stability of the original proportional control system (without integral term and derivative term). The integral term is the same as conventional integral term to achieve zero steady-state error tracking. The conventional derivative term is replaced by a lead-phase compensator and it is connected with integrator in series. Comparing with conventional PID controllers, the number of control gains are reduced from three to two, which is easier to be designed. In addition, a tuning method for the new digital PID controller is proposed to adjust the error convergence rate. A numerical simulation example is implemented to test the performance of the new digital PID controller, and it is compared with conventional pole placement method. Finally, the new digital PID controller is employed on the DC-DC converters. The simulation results are analysed, and the results obtained show that the new digital PID controller has desired and satisfactory performance for DC-DC converters.
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