An enhanced voltage sag compensation scheme for dynamic voltage restorer To Get this projects Call : 9566355386 / 99625 88976 Visit : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com

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An Enhanced Voltage Sag Compensation
Scheme for Dynamic Voltage Restorer
Abstract
In industrial distribution systems, the grid voltage
disturbances (voltage sags, swells, flicker, and harmonics) are
the most common power quality problems. Sag, being the most
frequent voltage disturbance, is typically caused by a fault at the
remote bus and is always accompanied by a phase angle jump.
The phase jump in the voltage can initiate transient current in
the capacitors, transformers, and motors. It can also disturb the
operation of commutated converters and may lead to glitch in
the performance of thyristor-based loads. It is therefore
imperative to protect sensitive loads, especially from the voltage
sags with phase jump. To protect sensitive loads from grid
voltage sags, custom power devices (such as SVC, D-
STATCOM, dynamic voltage restorer (DVR), and UPQC) are
being widely used. Among these devices, DVR has emerged as
the most cost effective and comprehensive solution.
Proposed system
This paper proposes a new control strategy in which the
main objective is to enhance the sag compensation time while

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LeMeniz Infotech
36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue,
Pondicherry-605 005.
Call: 0413-4205444, +91 9566355386, 99625 88976.
Web : www.lemenizinfotech.com / www.ieeemaster.com
Mail : projects@lemenizinfotech.com
mitigating the voltage phase jump. The proposed method aims at
regulating the contribution of active power to the least possible
value. To avoid the problem of over modulation, in the case of
deeper sag depth, an iterative loop is employed in the control
block. It is found that the proposed method can result in more
than 50% additional sag support time.
Advantages
 Improves the voltage quality of sensitive loads.
 Increases compensation time by operating in MAP mode.
 Reduction in dc link capacitor size.

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LeMeniz Infotech
36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue,
Pondicherry-605 005.
Call: 0413-4205444, +91 9566355386, 99625 88976.
Web : www.lemenizinfotech.com / www.ieeemaster.com
Mail : projects@lemenizinfotech.com
Applications
 Voltage SAG mitigation
Block diagram
AC
LC FILTER
THREE PHASE
VOLTAGE SOURCE
INVERTER
DC INPUT
SOURCE
THREE PHASE
DRIVER
PIC CONTROLLER
WITH BUFFER
12V
DC
5V DC

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Copyright © 2015 LeMeniz Infotech. All rights reserved
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LeMeniz Infotech
36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue,
Pondicherry-605 005.
Call: 0413-4205444, +91 9566355386, 99625 88976.
Web : www.lemenizinfotech.com / www.ieeemaster.com
Mail : projects@lemenizinfotech.com
Tools and software
 MPLAB – microcontroller programming.
 ORCAD – circuit layout.
 MATLAB/Simulink – Simulation.