ABSTRACT:
A new
interleaved three-phase PFC AC-DC single-stage multilevel is proposed in this
paper. The proposed converter can operate with reduced input current ripple and
peak switch currents due to its interleaved structure, a continuous output
inductor current due to its three-level structure, and improved light-load
efficiency as some of its switches can be turned on softly. In the paper, the
operation of the converter is explained, the steady-state characteristics of
the new converter are determined and its design is discussed. The feasibility
of the new converter is confirmed with experimental results obtained from a
prototype converter and its efficiency is compared to that of another
multilevel converter of similar type.
KEYWORDS:
1.
AC-DC power factor correction
2.
Single-stage converters
3.
Three-Phase Systems
4.
Three level converters
5.
Phase shifted modulation.
SOFTWARE: MATLAB/SIMULINK
CIRCUIT DIAGRAM:
Fig. 1. An interleaved
three-phase three-level converter.
Fig. 2. Proposed
single-stage three-level ac-dc converter.
EXPECTED SIMULATION RESULTS:
(a)
Input current and voltage (V: 100 V/div, I: 4 A/div)
(b)
Primary voltage of the main transformer (V:100V/div.,t: 4 µs/div.)
(c)
Vds and Id current of S4 (V: 100V/div.,
I:5A/div, t:10 µs/div.s)
Fig.
3. Typical converter waveforms.
Fig.
4. Efficiency of PWM and PSM three-level single-stage ac-dc converters
CONCLUSION:
A new
interleaved three-phase, three-level, single-stage power-factor-corrected AC-DC
converter using standard phase-shift PWM was presented in this paper. In this
paper, the operation of the converter was explained and its feasibility was confirmed
with experimental results obtained from a prototype converter. The efficiency
of the new converter was compared to that of another converter of the same
type. It was shown that the proposed converter has a better efficiency,
especially under light-load conditions, and it was explained that this is
because energy from the output inductor can always be used to ensure that the
very top and the very bottom switches can be turned ON with ZVS, due to a
discharge path that is introduced by its flying capacitor.
REFERENCES:
[1]
“Limits for Harmonic Current Emission (Equipment Input Current>16A per
Phase),” IEC1000-3-2 International Standard, 1995.
[2] J.M. Kwon, W.Y. Choi, B.H. Kwon,
“Single-stage quasi-resonant flyback converter for a cost-effective PDP sustain
power module,” IEEE Trans. on Industrial. Elec., vol. 58, no. 6, pp
2372-2377, 2011.
[3] H.S. Ribeiro and B.V. Borges, “New
optimized full-bridge single-stage ac/dc converters,” IEEE Trans. on
Industrial. Elec., vol. 58, no. 6, pp. 2397-2409, 2011.
[4] N. Golbon, and G. Moschopoulos, “A
low-power ac-dc single-stage converter with reduced dc bus voltage variation”, IEEE
Trans. on Power Electron., vol. 27, no.8, pp. 3714–3724, Jan. 2012.
[5] H. M. Suraywanshi, M.R. Ramteke. K.
L. Thakre, and V. B. Borghate, “Unity-power-factor operation of three phase
ac-dc soft switched converter based on boost active clamp topology in modular
approach,” IEEE Trans. on Power Elec., vol. 23, no. 1., pp. 229-236,
Jan. 2008.
