A new control scheme for single-phase PWM multilevel rectifier withpower-factor correction
Bor-Ren Lin; Hsin-Hung Lu
Industrial Electronics, IEEE Transactions on
Volume 46, Issue 4, Aug 1999 Page(s):820 - 829
Digital Object Identifier 10.1109/41.778250
Summary:A new control scheme for a single-phase bridge rectifier with
three-level pulsewidth modulation is proposed to achieve high power
factor and low current distortion. The main circuit consists of a
diode-bridge rectifier, a boost inductor, two AC power switches, and two
capacitors. According to the proposed control scheme based on a voltage
comparator and hysteresis current control technique, the output
capacitor voltages are balanced and the line current will follow the
supply current command. The supply current command is derived from a
DC-link voltage regulator and an output power estimator. The major
advantage of using a three-level rectifier is that the blocking voltage
of each AC power device is clamping to half of the DC-link voltage and
the generated harmonics of the three-level rectifier are less than those
of the conventional two-level rectifier. There are five voltage levels
(0, ±VDC/2, ±VDC) on the AC side of
the diode rectifier. The high power factor and low harmonic currents at
the input of the rectifier are verified by software simulations and
experimental tests
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