ABSTRACT:
Multilevel dc–dc converters making use of high frequency
transformers are suitable for integration in solid-state solutions for
applications in electric power distribution systems. This paper presents a
simplified switching scheme for three-level full-bridge dc–dc converters that
enables zero-voltage and zero current switching of all the main power devices.
It describes the main operational modes and design equations of the converter
as well as provides simulation and experimental results to demonstrate the
feasibility of the proposed ideas.
KEYWORDS:
1.
Distributed
energy resources
2.
multilevel
converters
3.
soft-switching
converters
4.
three-level
(3L) full bridge (FB)
5.
zero-voltage
zero-current switching (ZVZCS)
SOFTWARE:
MATLAB/SIMULINK
BLOCK DIAGRAM:
Fig.1.
3L FB ZVZCS converter. (a) Schematic
CONCLUSION:
This paper proposed a
3L ZVZCS converter with a simplified switching scheme for use in solid-state
solutions. The converter was shown to have the advantages of soft switching and
reduced voltage stresses across the devices, allowing higher voltage operation.
The operation of the 3L FB ZVZCS converter was analyzed. Experimental results
further demonstrated the feasibility of the proposed ideas. Future research
would include designing a prototype to implement an active clamp to reset the
current thus eliminating the series diodes and the losses associated with them.
This would have the added benefit of reducing the spikes from the rectifier
diodes when the dc voltage is applied during modes 1 and 6.
REFERENCES:
[1]
F. Blaabjerg, Z. Chen, and S. B. Kjaer, “Power electronics as efficient interface
in dispersed power generation systems,” IEEE Trans. Power Electron.,
vol. 19, no. 5, pp. 1184–1194, Sep. 2004.
[2]
J. D. Leeper and J. T. Barich, “Technology for distributed generation in a
global market place,” in Proc. Amer. Power Conf., 1998, vol. 1, pt. 1, pp.
33–36.
[3]
E. R. Ronan, S. D. Sudhoff, S. F. Glover, and D. L. Galloway, “A power
electronic-based distribution transformer,” IEEE Trans. Power Del.,
vol. 17, no. 2, pp. 537–543, Apr. 2002.
[4]
L. M. Tolbert and F. Z. Peng, “Multilevel converters as a utility interface for
renewable energy systems,” in Proc. 2000 Power Eng. Soc. Summer Meeting,
2000, vol. 2, pt. 2, pp. 1271–1274.
[5]
A. Nabae, I. Takahashi, and H. Akagi, “A new neutral point clamped PWM
inverter,” IEEE Trans. Ind. Appl., vol. IA-17, no. 5, pp. 518–523, Sep./Oct.
1981.
