DC link stabilization of single-phase power factor correction by using differential flatness-based control approach

In high power and high dynamics applications (such UPS or Welding Machine) to reduce line current harmonics, power factor correction PFC regulators are essential. This paper presents an innovative control law for a single-phase PFC boost converter. This kind of system is a nonlinear behavior. Classically, to control the voltage and the current in the converter, a linearized technique is often used to study the stability and to select the controller parameters of the nonlinear converter. In this paper, a nonlinear-control algorithm based on the flatness property of the system is proposed. Utilizing the flatness theory, we propose uncomplicated solutions to the system performance and stabilization problems. To validate the proposed method, a prototype single-phase PFC converter (1-kW, 360-Vdc is realized in the laboratory. The proposed control law is implemented by digital estimation in a dSPACE 1104 controller card. Experimental results in the laboratory corroborate the excellent control scheme.