Investigation on Dynamic Voltage Restorers With Two DC-Links and Series Converters for Three-Phase Four-Wire Systems

IEEE, 2014 

ABSTRACT

This paper proposes three dynamic voltage restorer (DVR) topologies. Such configurations are able to compensate voltage sags/swells in three-phase four-wire (3P4W) systems under balanced and unbalanced conditions. The proposed systems in this work use two independent dc-links. The complete control system, including the PWM technique, is developed and comparisons between the proposed configurations and a conventional one are performed. Simulation and experimental results are provided to validate the theoretical approach.

 

SOFTWARE: MATLAB/SIMULINK

 

BLOCK DIAGRAM:

Fig. 1 Typical DVR location in a 3P4W power distribution system

 

 EXPECTED SIMULATION RESULTS:

Fig. 2. Simulation results. Injected voltages by the DVR considering conventional 3HB topology and proposed configurations with equal dc-link voltages (vCa=vCb ! dc-link ratio 1:1) and different dc-link voltages (vCa 6= vCb ! dc-link ratios 1:2 and 1:3).

 

Fig. 3 Simulation results. Dynamic system operation under 30% single-phase sag in time domain. (a) Grid voltages. (b) Injected voltages by DVR. (c) Load voltages.

Fig. 4. Simulation results. Dynamic system operation under 30% two-phase sag in time domain. (a) Grid voltages. (b) Injected voltages by DVR. (c) Load voltages.

Fig. 5. Simulation results. Dynamic system operation under 30% three-phase sag in time domain. (a) Grid voltages. (b) Injected voltages by DVR. (c) Load voltages.

 

CONCLUSION

In this paper three four-wire dynamic voltage restorers (DVRs) have been presented. The studied configurations in this work are based on the concept of open-end winding. Simulated and experimental results presented show that the proposed DVRs are feasible and suitable for power distribution system with YY transformers with neutrals grounded.

 

REFERENCES

  • Brumsickle, G. Luckjiff, R. Schneider, D. Divan, and M. Mc- Granaghan, “Dynamic sag correctors: cost effective industrial power line conditioning,” in Industry Applications Conference, 1999. Thirty-Fourth IAS Annual Meeting. Conference Record of the 1999 IEEE, vol. 2, pp. 1339–1344 vol.2, 1999.
  • McGranaghan, D. Mueller, and M. Samotyj, “Voltage sags in industrial systems,” Industry Applications, IEEE Transactions on, vol. 29, no. 2, pp. 397–403, 1993.
  • -m. Ho and H.-H. Chung, “Implementation and performance evaluation of a fast dynamic control scheme for capacitor-supported interline DVR,” Power Electronics, IEEE Transactions on, vol. 25, no. 8,pp. 1975–1988, 2010.
  • Ghosh and G. Ledwich, “Compensation of distribution system voltage using DVR,” Power Delivery, IEEE Transactions on, vol. 17, no. 4, pp. 1030–1036, 2002.
  • Nielsen, M. Newman, H. Nielsen, and F. Blaabjerg, “Control and testing of a dynamic voltage restorer (DVR) at medium voltage level,” Power Electronics, IEEE Transactions on, vol. 19, no. 3, pp. 806–813,2004.

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