IEEE Transactions on Power Electronics, 2018
ABSTRACT:
A buck-boost ac-ac
converter with inverting and non-inverting operations is proposed. It
compensates both the voltage sag and swell when used as a dynamic voltage
restorer. Its basic switching cell is a unidirectional buck circuit, owing to
which it has no shoot-through concerns. It achieves safe commutation without
using RC snubbers or soft commutation strategies. Further, it can be
implemented with power MOSFETs without their body diodes conducting, and for
current freewheeling external diodes of good reverse recovery features can be
used to minimize the reverse recovery issues and relevant loss. The detailed
theoretical analysis and experimental results of a 300-W prototype converter
are provided.
KEYWORDS:
1.
AC–AC
converter
2.
Bipolar
voltage gain
3.
Commutation
4.
Dual-buck
5.
DVR
6.
MOSFET
SOFTWARE: MATLAB/SIMULINK
CIRCUIT DIAGRAM:
Fig
1: Proposed buck-boost ac-ac converter
EXPECTED SIMULATION
RESULTS:
Fig.2.
NIB operation. (a) Input and output voltages and inductor current. (b)
Drain-source voltages of switches.
Fig.
3. IBB operation (buck mode). (a)
Input and output voltages and inductor current. (b) Drain-source voltages of
switches.
Fig.
4. IBB operation (boost mode). (a) Input and output voltages and inductor
current. (b) Drain-source voltages of switches.
Fig.5. INIBB operation (non-inverting buck). (a) Input and
output voltages and inductor current. (b) Drain-source voltages of switches.
Fig.6. INIBB operation (inverting buck). (a) Input and
output voltages and inductor current. (b) Drain-source voltages of switches.
Fig. 7. INIBB
operation (inverting boost). (a) Input and output voltages and inductor
current. (b) Drain-source voltages of switches.
Fig. 8. Experimental results with partially
inductive load. (a) NIB operation. (b) IBB operation.
Fig. 9. Experimental results with non-linear load in
NIB operation.
Fig. 10. Experimental results of the
proposed DVR.
CONCLUSION:
In this paper, a
novel buck-boost ac-ac converter is proposed. It combined the operations of
non-inverting buck and inverting buck-boost converters in one structure.
Similar to the buck converter, it has a non-inverting buck operation, and
similar to an inverting buck-boost converter, it has an inverting buck-boost
operation. In addition, it has an extra operation, in which the output voltage
higher or lower than the input voltage that is in-phase or out-of-phase with
the input voltage can be obtained. Thus, the proposed converter can compensate
both voltage sag and swell when used in a DVR.
The
basic unit of the proposed converter is a unidirectional buck circuit,
therefore it has no short-circuit and open-circuit problems. It has no
commutation problems, and does not require lossy snubbers and/or soft
commutation strategies for operation. Further, it can utilize MOSFETs without
their body diodes conducting and without reverse recovery issues and relevant
losses. A detailed analysis of the proposed converter and DVR has been
presented and validated by experimental results.
REFERENCES:
[1]
W. E. Brumsickle, R. S. Schneider, G. A.
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[2]
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[3]
IEEE Recommended Practice for Monitoring
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[4]
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