Transformer-less dynamic voltage restorer based on buck-boost converter

ABSTRACT

In this study, a new topology for dynamic voltage restorer (DVR) has been proposed. The topology is inspired by the buck-boost ac/ac converter to produce the required compensation voltage. This topology is able to compensate different voltage disturbances such as sag, swell and flicker without leap of the phase angle. The mass of the proposed topology has been reduced due to lack of injection topology. In addition to, the required compensation energy is directly delivered from the grid through the grid voltage. Therefore, the massive dc-link capacitors are not required to implement. To verify the qualification of the topology, the simulation results by MATLAB/SIMULINK software have been presented. Moreover, an experimental prototype of the case study has been designed and tested.

 

SOFTWARE: MATLAB/SIMULINK

 

BLOCK DIAGRAM:

Fig. 1 Proposed topology

 

EXPECTED SIMULATION RESULTS:

Fig. 2. Simulation results for sag compensation

 

 

Fig. 3 Simulation results for swell compensation

 

Fig. 4. Simulation results

 

CONCLUSION

In this paper a new topology for DVR using buck-boost ac/ac converter was proposed. This topology contains five bidirectional switches, an inductor and a capacitor. Unlike the conventional topologies, the proposed DVR does not have any injection transformer due to the structural features. Because of direct connection to the grid, the storage elements are not required in the proposed topology. Therefore, this topology has less physical volume, mass and price in comparison with traditional topologies. Any kind of voltage disturbances can be compensated by the proposed topology and the effective operation has been confirmed by simulation and experimental results.

 

 

 

REFERENCES

 

  • Hietpas, S.M., Naden, M.: ‘Automatic voltage regulator using an AC voltagevoltage converter’, IEEE Trans. Ind. Appl., 2000, 36, (1), pp. 33–38
  • Vilathgamuwa, D.M., Member, S., Perera, A.A.D.R., et al.: ‘Dynamic voltage restorer’, 2003, 18, (3), pp. 928–936
  • Wijekoon, H.M., Vilathgamuwa, D.M., Choi, S.S.: ‘Interline dynamic voltage restorer: an economical way to improve interline power quality’, IEE Proc. Gener. Transm. Distrib., 2003, 150, (5), pp. 513–520
  • Wang, B., Member, S., Venkataramanan, G., et al.: ‘Operation and control of a dynamic voltage restorer using transformer coupled H-bridge converters’, 2006, 21, (4), pp. 1053–1061
  • Babaei, E., Farhadi Kangarlu, M.: ‘Voltage quality improvement by a dynamic voltage restorer based on a direct three-phase converter with fictitious DC link’, IET Gener. Transm. Distrib., 2011, 5, (8), p. 814

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