Comparison of Current Control Method for Single-phase PFC converter with 1-switch Voltage Doubler Strategy

Abstract

-This paper describes the performance comparison results for current controller of a single-phase PFC converter with 1-switch voltage doubler strategy for single-phase double-conversion UPS(Uninterruptible Power Supply). A single-phase PFC converter with 1-switch voltage doubler strategy needs a diode bridge and one bidirectional active switch. Thus it is possible to reduce the material cost. However, the study results of current controller design and comparison of current control method has not been known after the converter circuit was proposed. For the performance comparison of current control, single-phase 3 kVA double-conversion UPS was tested. The performance of PI and PR current cotnroller is experimentally confirmed with followings -input current reference tracking, input power factor correction and input current THD suppression.

Low Cost and High Performance Single Phase UPS Using a Single-Loop Robust Voltage Controller

“…The input current controller uses a PI controller, and is uses the absolute value in the input current control in order to reduce the zero-crossing distortion. In addition, duty feedforward compensation is also added to the output of the current controller in order to reduce the leading phase effect of the input current [23]. Additionally, the 120Hz mean value of the DC bus voltage is used on the DC bus voltage control and the duty feedforward compensation.…”

“…4 shows a block diagram of a PI current controller. The performance of the PI current controller is experimentally tested to confirm the input current reference tracking, input power factor correction and input current THD suppression [23]. (1)…”