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
[1]
Hietpas,
S.M., Naden, M.: ‘Automatic voltage regulator using an AC voltagevoltage converter’,
IEEE Trans. Ind. Appl., 2000, 36, (1), pp. 33–38
[2]
Vilathgamuwa,
D.M., Member, S., Perera, A.A.D.R., et al.: ‘Dynamic voltage restorer’,
2003, 18, (3), pp. 928–936
[3]
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
[4]
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
[5]
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
