Three-Level Converters based Generalized Unified Power Quality Conditioner

A generalized unified power quality conditioner (GUPQC) by using three single-phase three-level voltage source converters (VSCs) connected back-to-back through a common dc link is proposed in this paper as a new custom power device for a three-feeder distribution system. One of the converters is connected in shunt with one feeder for mitigation of current harmonics and reactive power compensation, while the other two VSCs are connected in series with the other two feeders to maintain the load voltage sinusoidal and at constant level. A new control scheme based on synchronous reference frame is proposed for series converters. The simulation analysis on compensation performance of GUPQC based on PSCAD/EMTDC is reported.

Authors:

• Bahr Eldin S. M
• K. S. Rama Rao
• N. Perumal

Keywords:

• Custom power device
• generalized unified power quality conditioner
• PSCAD/ETMDC
• voltage source converter

References:

[1] H. Fujita and H. Akagi, "The unified power quality conditioner: The
integration of series and shunt-active filters," IEEE Trans. Power
Electron, vol. 13, no. 2, pp. 315-322, Mar. 1998.
[2] B. Han, B. Bae, S. Baek, and G. Jang, "New configuration of UPQC for
medium-voltage application," IEEE Trans. Power Deli., vol. 21, no. 3,
pp. 1438-1444, Jul. 2006.
[3] V. Khadkikar and A. Chandra, "A novel structure for three-phase fourwire
distribution system utilizing unified power quality conditioner,"
IEEE Trans. Ind. Appl., vol. 45, no. 5, pp. 1897-1902, Sept./Oct. 2009.
[4] B. Hen, B. Bae, H. Kim, and S. Baek, "Combined operation of unified
power-quality conditioner with distributed generation," IEEE Trans.
Power Del., vol. 21, no. 1, pp. 330-338, Jan. 2006.
[5] B. Fardanesh, B. Shperling, E. Uzunovic, and S. Zelingher, "Multiconverter
FACTS devices: The generalized unified power flow
controller (GUPFC)," IEEE Power Eng. Soc. Summer Meeting 2000, pp.
2511-2517.
[6] X. P. Zhang, E. Handschin, and M. Yao, "Modeling of generalize
unified power flow controller (GUPFC) in a nonlinear interior point
OPF," IEEE Trans. Power Syst., vol. 16, pp. 367-373, Aug. 2001.
[7] A. K. Jindal, A. Ghosh, and A. Joshi, "Interline unified power quality
conditioner," IEEE Trans. Power Del., vol. 22, pp. 364-372, 2007.
[8] H. R. Mohammadi, A. Y. Varjani, and H. Mokhtari, "Multiconverter
unified power quality conditioner system MC-UPQC," IEEE Trans.
Power Del., vol. 24, no. 3, pp. 1679-1686, Jul. 2009.
[9] Y. Rong, C. Li, H. Tang, and X. Zheng, "Output feedback control of
single-phase UPQC based on a novel model," IEEE Trans. Power Del.,
vol. 24, no. 3, pp. 1586-1597, Jul. 2009
[10] M. Kesler and E. Ozdemir, "Synchronous reference frame based control
method for UPQC under unbalanced and distorted load conditions,"
IEEE Trans. Ind. Electron., vol. 58, no. 9, pp. 3967-3975, Sep. 2010.
[11] V. Khadkikar, P. Agarwal, A. Chandra, A. O. Barry, and T. D. Nguyen,
"A simple new control technique for unified power quality conditioner
(UPQC)," 11th Int. Conf. Harmonics and Quality of Power, in 2004, pp.
289-293.
[12] H. Akagi, E. H. Watanabe, M. Arades, Instantaneous Power Theory
and Applications to Power Conditioning, Wiley-IEEE Press, New
Jersey, 2007, pp. 265-371.
[13] V. Khadkikar and A. Chandra, "UPQC-S: A novel concept of
simultaneous voltage sag/swell and load reactive power compensations
utilizing series inverter of UPQC," IEEE Trans. Power Electon., vol. 99,
pp. 2414-2425. Jan. 2011.
[14] M. Basu, S. P. Das, and G. K. Dubey, "Comparative evaluation of two
models of UPQC for suitable interface to enhance power quality," Elect.
Power Syst. Res., vol. 77, pp. 821-830, 2007.