13-05-2011, 03:21 PM
Presented by
Ahmed A. Helal
ICPSE_2010_DVR.ppt (Size: 363.57 KB / Downloads: 118)
DVR Design Procedure
The design procedure can be divided into
The power circuit design
The control Algorithm
The power circuit is composed of;
Injection transformers
Filter
inverter
DC source
The following data are the same for the simulation and the practical system;
Source: Vs = 110 V (line to line)
Zs = 1.3 Ω
Load: three phase balanced load 120 Ω per phase
Filter: L = 370 µH
C = 90 µF
Injection transformers:
Turns ratio = 1:1 ratings = 45V, 2A
DC source for the inverter: Vdc = 70V
Conclusions
The following outcomes may be concluded:
DVR is a function/price compromised solution to mitigate voltage sag especially at medium level loads
The simulation of three phase DVR using SVPWM technique to control its inverter was presented
Practically, the DVR can respond very fast to mitigate voltage sag (<0.5 cycle) which is perfect for almost all sag sensitive loads
The DC source capacity imposes a limitation on the restoration capability of the DVR