Email this article Srf Theory Revisited†To Control Self-Supported Dynamic Voltage Restorer (Dvr) For Unbalanced And Nonlinear Loads
Abstract
In this paper a fuzzy controller based DVR is proposed for the protection of the sensitive unbalanced nonlinear loads from sag/swell, distortion, and unbalance in supply voltage is achieved. A simple generalized algorithm based on basic synchronous reference frame theory has been developed for the generation of instantaneous reference compensating voltages for controlling a DVR. This novel algorithm makes use of the fundamental positive sequence phase voltages extracted by sensing only two unbalanced and/or distorted line voltages. In addition to this a fuzzy logic controller have been developed to reduce the % THD compared with the conventional method. The compensating voltages when injected in series with a distribution feeder by three single-phase H-bridge voltage-source converters A capacitor-supported DVR does not need any active power during steady-state operation because the injected voltage is in quadrature with the feeder current. The proposed control strategy is validated through simulation results with the help of MATLAB/SIMULINK software.
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References
M. H. J. Bollen, Understanding Power Quality Problems: Voltage Sags and Interruptions. Piscataway, NJ, USA: IEEE Press, 2000.
A. Ghosh and G. Ledwich, Power Quality Enhancement Using Custom Power Devices. London, U.K.: Kluwer, 2002.
R. C. Dugan, M. F. McGranaghan, and H. W. Beaty, Electric Power Systems Quality, 2nd ed. New York, NY, USA: McGraw-Hill, 2006.
H. Akagi, E. H. Watanabe, and M. Aredes, Instantaneous Power Theory and Applications to Power Conditioning. Hoboken, NJ, USA: Wiley, 2007.
A. Moreno-Munoz, Power Quality: Mitigation Technologies in a Distributed Environment. London, U.K.: Springer-Verlag, 2007.
IEEE Recommended Practices and Recommendations for Harmonics Control in Electric Power Systems, IEEE Std. 519, 1993.
A. Ghosh, “Performance study of two different compensating devices in a custom power park,†Proc. Inst. Elect. Eng.—Gen. Transmiss. Distrib., vol. 152, no. 4, pp. 521–528, Jul. 2005.
P. Jayaprakash, B. Singh, D. P. Kothari, A. Chandra, and K. Al-Haddad, “Control of reduced rating dynamic voltage restorer with battery energy storage system,†in Proc. Power Syst. Technol. IEEE POWERCON Oct.12–15, 2008, pp.1–8.
B. Singh, P. Jayaprakash, and D. P. Kothari, “Adaline based control of capacitor supported DVR for distribution systems,†J. Power Electron., vol. 9, no. 3, pp. 386–395, May 2009.
A. Ghosh and A. Joshi, “A new algorithm for the generation of reference voltages of a DVR using the method of instantaneous symmetrical components,†IEEE Power Eng. Rev., vol. 22, no. 1, pp. 63–65, Jan. 2002.
A. Ghosh and G. Ledwich, “Compensation of distribution system voltage using DVR,†IEEE Trans. Power Del., vol. 17, no. 4, pp. 1030–1036, Oct. 2002.
M. Vilathgamuwa, R. Perera, S. Choi, and K. Tseng, “Control of energy optimized dynamic voltage restorer,†in Proc. IEEE IECON, 1999, vol. 2, pp. 873–878.
S.-J. Lee, H. Kim, S.-K. Sul, and F. Blaabjerg, “A novel control algorithm for static series compensators by use of PQR instantaneous power theory,†IEEE Trans. Power Electron., vol. 19, no. 3, pp. 814–827, May 2004.
M. I. Marei, E. F. El-Saadany, and M. M. A. Salama, “A new approach to control DVR based on symmetrical components estimation,†IEEE Trans. Power Del., vol. 22, no. 4, pp. 2017–2024, Oct. 2007.
J. W. Liu, S. S. Choi, and S. Chen, “Design of step dynamic voltage regulator for power quality enhancement,†IEEE Trans. Power Del., vol. 18, no. 4, pp. 1403–1409, Oct. 2003.
A. K. Jindal, A. Ghosh, and A. Joshi, “Critical load bus voltage control using DVR under system frequency variation,†Elect. Power Syst. Res., vol. 78, no. 2, pp. 255–263, Feb. 2008.
A. Ghosh, A. K. Jindal, and A. Joshi, “Design of a capacitor-supported dynamic voltage restorer (DVR) for unbalanced and distorted loads,†IEEE Trans. Power Del., vol. 19, no. 1, pp. 405–413, Jan. 2004.
S. Sasitharan and M. K. Mishra, “Constant switching frequency band controller for dynamic voltage restorer,†IET Power Electron., vol. 3, no. 5, pp. 657–667, Sep. 2010.
J. G. Nielsen and F. Blaabjerg, “A detailed comparison of system topologies for dynamic voltage restorers,†IEEE Trans. Ind. Appl., vol. 41, no. 5, pp. 1272–1280, Sep./Oct. 2005.
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