Owing to the positive and negative sequence “bi-resonance” feature and no need for complex rotating coordinate transformation

the proportional-resonant (PR) controller is widely used in the control system of the pulse width modulation (PWM) converter. From the engineering point of view

this paper summarizes three key points of the application of the PR controller

i.e.

parameter design method

the impact of the digital control delay and its phase compensation strategy

as well as a frequency adaptive PR controller and its discrete method. Simulation and experimental results have verified the rationality and effectiveness of the parameter design consideration

the effectiveness of digital delay compensation and the frequency adaptive nature of the frequency adaptive PR controller.