Page 172 - Power Quality in Electrical Systems

154 Chapter Ten

■ Three phases, to 50 percent voltage remaining, 2 s
■ Three phases, to zero voltage remaining, 3 cycles standard, 12 cycles
with extended outage provision

Summary
The dynamic voltage compensator typically corrects line voltage sags
down to zero percent remaining for a time of 12 cycles, and to 50 percent
remaining for up to 2 s. The compensator does not require any stored
energy, such as batteries. Therefore, the compensator is a less costly
equipment than a battery-powered UPS. However, the compensator
cannot supply power to critical loads for outages longer than 2 s, while
a battery-powered UPS is only limited in time by the ampere-hour
capacity of its batteries.

References

[10.1] D. G. Fink and H. W. Beaty, Standard Handbook for Electrical Engineers, 14th edi-
tion, McGraw-Hill, 2000, Figure 10.28.
[10.2] S. M. Silva, S. E. da Silveira, A. de Souza Reis, and B. J. Cardosa Filho, “Analysis
of a Dynamic Voltage Compensator with Reduced Switch-Count and Absence of
Energy Storage Systems,” IEEE Trans. Ind. Appl., vol. 41, no. 5, September 10,
2005, pp. 1255–1262.
[10.3] T. Jimichi, H. Fujita, and H. Akagi, “Design and Experimentation of a Dynamic
Voltage Restorer Capable of Significantly Reducing an Energy-Storage Element,”
Conference Record, 2005 40th IAS Annual Meeting, pp. 896–903.
[10.4] W. E. Brunsickle, R. S. Schneider, G. A. Luckjiff, D. M. Divan, and M. F.
McGranaghan, “Dynamic Sag Correctors: Cost-Effective Industrial Power Line
Conditioning,” IEEE Trans. Ind. Appl., vol. 37, no. 1, January/February 2001,
pp. 212–217.
[10.5] A. Kusko and N. Medora, “Economic and Technical Comparison of Dynamic Voltage
Compensators with Uninterruptible Power Supplies,” Power Quality Conference,
October 24–26, 2006.
[10.6] SoftSwitching, “Technical Bulletin,” Middleton, WI.