This paper presents a novel dynamic voltage restorer (DVR) capable of handling deep sags including outage on a low voltage distribution system. The DVR recovers sags up to 10% of nominal voltage; otherwise, it will operate as an uninterruptible power supply (UPS). A transformer is connected in series with the load when restoring sags, and is reconfigured into parallel connection using switches when handling outages. The controller uses a Fuzzy Logic with 3 inputs to maintain the load voltage through d-q transformation. Preliminary results from laboratory tests are also presented in this paper.

1. ELECTRICAL PROJECTS USING MATLAB/SIMULINK
Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in
0-9347143789/9949240245
For Simulation Results of the project Contact Us
Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in
0-9347143789/9949240245
A Novel Dynamic Voltage Restorer with Outage
Handling Capability Using Fuzzy Logic Controller
ABSTRACT:
This paper presents a novel dynamic voltage restorer (DVR) capable of handling deep sags
including outage on a low voltage distribution system. The DVR recovers sags up to 10% of
nominal voltage; otherwise, it will operate as an uninterruptible power supply (UPS). A
transformer is connected in series with the load when restoring sags, and is reconfigured into
parallel connection using switches when handling outages. The controller uses a Fuzzy Logic
with 3 inputs to maintain the load voltage through d-q transformation. Preliminary results from
laboratory tests are also presented in this paper.
SOFTWARE: MATLAB/SIMULINK
BLOCK DIAGRAM:
Fig. 1. Block diagram of the proposed DVR

2. ELECTRICAL PROJECTS USING MATLAB/SIMULINK
Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in
0-9347143789/9949240245
For Simulation Results of the project Contact Us
Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in
0-9347143789/9949240245
EXPECTED SIMULATION RESULTS:
(a) Grid Voltage
(b) Load Voltage
(c) Inverter Voltage
Figure 2. The grid, load and inverter voltages under 3-phase fault

3. ELECTRICAL PROJECTS USING MATLAB/SIMULINK
Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in
0-9347143789/9949240245
For Simulation Results of the project Contact Us
Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in
0-9347143789/9949240245
Figure 3. Grid and load voltages during 1-phase to ground fault
CONCLUSION:
A dynamic voltage restorer using Fuzzy Logic controller was demonstrated to remedy sags and
outage voltages. Phase jumps and unbalanced conditions due to single phase-to-ground fault can
also be compensated by the DVR. In the event of outage, where the voltage drops below 10%,
the DVR restore the voltage into the normal. Thus, the load voltage is unaffected by the
disturbances including sags and outages.
REFERENCES:
[1] T Wunderlin, P. Dahler, D. Amhof, and H. Gruning, “Power Supply quality improvement
with a dynamic voltage restorer (DVR)”, proc of EMPD ’98, Mar 3-5.

4. ELECTRICAL PROJECTS USING MATLAB/SIMULINK
Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in
0-9347143789/9949240245
For Simulation Results of the project Contact Us
Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in
0-9347143789/9949240245
[2] A. Arora, K. Chan, T. Jauch, A. Kara, and E. Wirth,”Innovative system solutions for power
quality enhancement”, ABB Review 3, 1998.
[3] A. Campos and G Joos et al.,”Analysis and design of a series voltage unbalance compensator
based on threephase VSI operating with unbalanced switching function”, IEEE Trans. On
Power Electronics, vol. 9 no. 3, pp.269-274, May 1994.
[4] K. Haddad and and G. Joos,”Distribution system voltage regulation under fault conditions
using static series regulators”, proc of Annual Meeting IEEE Ind. Appl. Soc., 1997. pp. 1383-
1389.
[5] Ashari, M., C.V. Nayar and S. Islam, “Steady-State Performance of a Grid Interactive
Voltage Source Inverter”, proceedings of IEEE PES Summer Meeting, 15-19 July 2001,
Vancouver, BC Canada.