Download Low-Common Mode Voltage H-Bridge Converter with Additional

1
Low-Common Mode Voltage H-Bridge
Converter with Additional Switch Legs
Abstract:
H-bridge converter with additional switch legs (HA converter) and its offspring circuit are
proposed in this paper with the intent to reduce the common mode noise. The proposed
topology connects grounds of the input and output terminals, which gives zero common
mode current in the ideal case. The operation of the proposed circuit is flexible and allows
for the circuit to be capable of both ac-dc and dc-ac conversions. The proposed topology is
especially advantageous when it is applied to the photovoltaic power conditioning system in
dc distribution system or stand-alone power system because they include large stray
capacitances and are prone to common mode EMI. In this paper, a 4-switch HA (HA4S)
converter for both ac-dc rectification and dc-ac inversion is derived from the proposed HA
converter as the implementation example. The experimental results based on the proposed
and the conventional prototype circuits prove that the HA4S converter outperforms the
conventional counterparts.
INTRODUCTION:
E days due to the fossil fuel depletion, energy demand increase, and carbon dioxide gas
NERGY shortage and environmental problems are gathering global concerns in these
emission. Renewable energy sources such as photovoltaic (PV) panels and wind turbines
are highlighted as solutions to reduce the fossil fuel consumption and greenhouse gas
emission, and dc distribution is considered as an emerging candidate of the new power
distribution system [1]-[3]. The dc distribution system has many advantages such as high
efficiency [4] and compatibility to the renewable energy sources. The dc distribution system
shows better accessibility to the renewable energy sources than ac distribution counterpart
by reducing the number of power conversion stages which interface the renewable energy
source to the dc bus. To stabilize the dc distribution system against the fluctuating outputs
of the renewable energy sources and achieve proper cooperation with the conventional ac
utility grid, various power conversion technologies are employed. The power converters in
the dc distribution system such as ac-dc rectifiers and
Manuscript received March 31, 2012; revised June 26, 2012; accepted August 6, 2012.
Date of current version October 26, 2012. Recommended for publication by Associate
Editor T. Shimizu.
www.frontlinetechnologies.org
[email protected]
+91 7200247247
2
Architecture Diagram:
CONCLUSION:
HA converter and its subset circuit HA4S converter have been presented. The proposed
converters generate negligible common mode voltage because they fix the voltage level of
the common mode stray capacitance by connecting the grounds input and output terminal.
Due to its flexibility and expandability, the HA
converter is capable of both ac-dc rectification and dc-ac inversion by properly selecting
the switching states. The operation analysis and dedicated control algorithm for line current
shaping and control have been illustrated. The experimental results verify that the proposed
HA4S converter shows lower common mode EMI than the conventional counterpart, while
demonstrating comparable efficiency in both ac-dc and dc-ac conversion.
References:
1.
J. M. Carrasco, L. G. Franquelo, J. T. Bialasiewicz, E. Galvan, R. C. Portillo Guisado, M.
A. M. Prats, J. I. Leon, and N. Moreno-Alfonso, “Power- electronic systems for the
grid integration of renewable energy sources: A survey,” IEEE Trans. Ind. Electron.,
vol. 53, no. 4, pp. 1002-1016, Jun. 2006.
2.
H. Kakigano, Y. Miura, and T. Ise, “Low voltage bipolar type DC microgrid for super
high quality distribution,” IEEE Trans. PowerElectron., vol. 25, no. 12, pp. 30663075, Nov./Dec. 2010.
3.
A. Kwasinski, “Quantitative evaluation of dc micro-grids availability: effects of
system architecture and converter topology design choices,” IEEE Trans.
PowerElectron., vol. 26, no. 3, pp. 835-851, Mar. 2011.
www.frontlinetechnologies.org
[email protected]
+91 7200247247
3
4.
A. Pratt, P. Kumar, and T. V. Aldridge, “Evaluation of 400 V DC distribution in telco
and data centers to improve energy efficiency,” in Proc. IEEE 29th Int. Telecommun.
5.
6.
Energy Conf., 2007-2010, pp. 32-39.
H. Ott, Electromagnetic Compatibility Engineering. Hoboken, NJ: Wiley, 2009.
A. F. Souza and I. Barbi, “High power factor rectifier with reduced conduction and
commutation losses,” in Proc. Int. Telecommun. Energy Conf., Jun. 1999, pp. 8.1.1—
8.1.5.
7.
P. Kong, S. Wang, and F. C. Lee, “Common mode EMI noise suppression for
bridgeless PFC converters,” IEEE Trans. Power Electron., vol. 23, no. 1, pp. 291-297,
Jan. 2008.
8.
K. Mainali and R. Oruganti, “Conducted EMI mitigation techniques for switch-mode
power converters: A survey,” IEEE Trans.
., vol. 25, no. 9, pp. 2344-2356, Sep.
2010.
9.
L. Huber, Y. Jang, and M. M. Jovanovic, “Performance evaluation of bridgeless PFC
boost rectifiers,” IEEE Trans. Power Electron., vol. 23, no. 3, pp. 1381-1390,
May 2008.
10.
P. Kong, S. Wang, F. C. Lee, and C. Wang, “Common-mode EMI study and reduction
technique for the interleaved multichannel PFC converter,” IEEE Trans.
PowerElectron., vol. 23, no. 5, pp. 2576-2584, Sep. 2008.
www.frontlinetechnologies.org
[email protected]
+91 7200247247