IJSRD - International Journal for Scientific Research & Development| Vol. 6, Issue 05, 2018 | ISSN (online): 2321-0613

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Voltage Quality Improvement by using Advanced Detection Technique of

Dynamic Voltage Restorer

Kalpesh Chaudhari1 Prabodh Khampariya2 1,2SSSUTMS Sehore, India

Abstract— This paper shows and confirms the utilization of

dynamic voltage restorer (DVR) to shield delicate burdens

from the impacts of voltage list/swell on the conveyance

feeder. DVR is one of the custom power gadgets which are

utilized as a compelling answer for the security of delicate

burdens against voltage unsettling influences in control

appropriation framework. For alleviation of voltage

droop/swell by utilizing DVR it is essential for the DVR

control framework to recognize begin and end of a voltage

list/swell and to decide the hang/swell size and any related

stage move. The DVR, which is utilized as a part of

arrangement with a delicate load, must have the capacity to

react rapidly to a voltage droop/swell if end clients of touchy

hardware are to encounter no voltage hangs/swell. The d-q

hypothesis is utilized for the location of droops/swells,

though the control of the voltage source inverter (VSI) is

finished with the assistance of Sinusoidal Pulse Width

Modulation (SPWM) the re-enactment was done with the

assistance of SIMULINK and MATLAB and the outcomes

were observed to be as per hypothesis.

Key words: Dynamic Voltage Restorer (DVR), Voltage

Quality

I. INTRODUCTION

Extensive variety of utilizations of energy electronic gadgets

in control framework makes control quality a critical issue in

the present power situation. It is the obligation of the utility

to supply an unadulterated sinusoidal voltage of required size

and recurrence at constantly and with no deviation to its

shoppers. Be that as it may, actually it isn't conceivable to see

perfect waveforms of the voltage. The voltage waveforms are

bothered from perfect waveform because of event of

unsettling influences like voltage hang, voltage swell,

intrusions, and gleam vacillations and so on and furthermore

because of the utilization of non-straight loads. Such voltage

mutilation antagonistically influences the execution of

hardware associated in the framework. The different

businesses like process ventures, petrochemical enterprises,

semiconductor ventures, compound enterprises, paper

factories and so forth utilize gear which are extremely touchy

to voltage contortion. Poor voltage quality may bring about

end of the procedure, loss of information in advanced gadgets

and so on. And subsequently gigantic money related

misfortune to customer. Out of the different voltage

aggravations, voltage droop is an incessant unsettling

influence in control framework. It has been watched that

around 92% of the intrusions in mechanical establishments

are because of voltage lists.

II. LITERATURE SURVEY

A writing study is completed for the examination and usage

methods for dynamic voltage restorer. It is discovered that

dynamic voltage restorer (DVR) is a streamlined and

financially savvy answer for moderation of voltage hang and

swell. It is discovered that DVR can likewise be utilized for

alleviation of voltage symphonious.

III. PROPOSED IMPLEMENTATION OF DYNAMIC VOLTAGE

RESTORER

A. Operating Principle of DVR

Dynamic Voltage Restorer (DVR) is one of the compelling

custom power gadgets that can be utilized to enhance control

quality from any unsettling influences in the dissemination

line. The DVR can be utilized for insurance and recuperation

or reestablish the nature of voltage to the delicate load. An

arrangement of three stage voltages with a fitting extent and

term can be infused through infusion transformer and must be

in stage with the lattice voltage [8]. A DVR is a strong state

control gadgets exchanging gadget comprising of either GTO

or IGBT, a capacitor bank as a vitality stockpiling gadget and

infusion transformers. Schematic outline of a DVR associated

with control framework is appeared in Fig. 2.1.

Fig. 3.9: Schematic Diagram of Dynamic Voltage Restorer

The essential thought of the DVR is to infuse a

controlled voltage produced by a constrained drove converter

in arrangement to the transport voltage by methods for an

infusing transformer. A DC capacitor bank which goes about

as a vitality stockpiling gadget, gives a managed dc voltage

source. A DC to AC inverter controls this voltage by

appropriate PWM technique. An identical circuit chart

of the DVR and the guideline of arrangement infusion for Sag

remuneration is delineated in Fig. 2.2

Fig. 3.10: Equivalent Circuit of DVR

DVR can be represented as a voltage source (inj

v )

in series with impedance DVR

Z , where DVR

Z is the impedance

of the DVR. For voltage control, inj

v should be in phase with

Voltage Quality Improvement by using Advanced Detection Technique of Dynamic Voltage Restorer

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load voltageL

V . S

V Represents voltage sag which is the

supply voltage to the load without compensation.

Using Kirchhoff’s voltage law it can be written:

)()()( tvtvtvinjSL

(2.1)

Where, )(tvL

is the load voltage, )(tvS

is the sagged supply

voltage, )(tvinj

is the voltage injected by the DVR as shown

in Fig.2.2. Under normal voltage conditions, the load power

(L

S ) on each phase is given by eqn. (3.2),

LLLLLjQPIVS

* (2.2)

Where,

LI* Is the load current,

LP and

LQ are active and

reactive power taken by the load respectively, during a

sag/swell. When the DVR is active and restores the voltages

back to normal, the following equation applies for each

phase:

)()(injinjSagSagLLL

jQPjQPjQPS (2.3)

Where the “sag” subscript refers to the sagged

supply quantities. The “inj” subscript refers to Quantities

injected by the mitigation device. Generally dynamic voltage

restorer is located at the point where sensitive loads are

connected or regulated voltages are required as shown in Fig.

2.3.

Fig 3.11: Location of DV

IV. RESULT & DISCUSSIONS

A. Implementation of DVR

As said before DVR comprise of an inverter. Inverter

exchanging ought to be controlled such that yield of the

inverter tracks the reference remunerating voltage. Sine

triangular PWM and Hysteresis voltage control can be

utilized to produce heartbeats to the switches of three stage

inverter. The three stage inverter is associated in arrangement

with the transmission line with the assistance of arrangement

transformer. Finish model of DVR utilizing sine-triangular

PWM system for inverter6circuit is given in Fig.4.1.

Different framework parameters considered for reenactment

are given in Table.4.1

Parameter Valve

Source voltage V L-L 415V

DC Bus Voltage 400V

Filter Capacitance 26 µF

Load Resistance 31.84 Ω

Load Inductance 0.139H

Table 4.1: System parameters

Case1. (a) Voltage sag compensation using sine

triangular PWM

An adjusted voltage drop of greatness 50% of

ostensible voltage happens from t=0.05 sec to t=0.10 sec. The

voltage waveforms of source voltage, reference repaying

voltage, and DVR inverter infused voltage and load voltage

after pay are appeared in Fig. 4.10 (a), (b), (c), (d) separately.

An arrangement transformer of 1:1 proportion is utilized for

reproduction. It is seen from the waveform that the real

infused voltage is same as the reference repaying voltage. A

capacitor is associated at the yield of the inverter for the

sifting reason.

(a)

(b)

(c)

(d)

Fig. 4.2 (a): The voltage waveform with sag, (b) reference

compensating voltage, (c) DVR injected voltage and (d)

load voltage after compensation using sine triangular PWM.

Voltage Quality Improvement by using Advanced Detection Technique of Dynamic Voltage Restorer

(IJSRD/Vol. 6/Issue 05/2018/008)

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Fig. 4.2 (d) shows that voltage at load terminal is at

its pre sag value all the time.

1) Case 1. (a) Voltage swell compensation using sine

triangular PWM

The advantage of d-q-0 theory is that it is also applicable to

compensation under voltage swell. Voltage swell of 20% can

be consider for the simulation. The voltage waveform with

swell, DVR injected voltage and load voltage after

compensation are shown in Fig.4.3 (a), (b), (c) respectively.

(a)

(b)

(c)

Fig. 4.3 (a): The voltage waveform with swell (b) DVR

injected voltage and (c) load voltage after compensation

using sine triangular PWM. It is clear from waveform of

Fig. 4.3 (c) that voltage at sensitive load is at desired value

all the time.

2) Case 1. (b) Voltage sag compensation using hysteresis

voltage control

Usage of DVR utilizing hysteresis voltage control is

confirmed for a similar circuit utilizing MATLAB. An

adjusted voltage drop of half extent happens from t=0.05sec

to t=0.10 sec. The Fig. 4.12 (a), (b), (c) demonstrates the

waveform of source voltage, DVR inverter infused voltage

and load voltage after pay separately.

(a)

(b)

(c)

Fig. 4.4 (a): The voltage waveform with sag (b) DVR

injected voltage and (c) load voltage after compensation

using hysteresis voltage control

3) Case1. (b) Voltage swell compensation using hysteresis

voltage control

Implementation of DVR using hysteresis voltage control for

swell is verified for the same circuit using MATLAB. The

waveform with swell, DVR injected voltage and load voltage

after compensation for voltage swell using hysteresis control

are shown in Fig.4.5 (a), (b), (c) respectively.

(a)

Voltage Quality Improvement by using Advanced Detection Technique of Dynamic Voltage Restorer

(IJSRD/Vol. 6/Issue 05/2018/008)

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(b)

(c)

Fig. 4.5 (a): The voltage waveform with swell (b) DVR

injected voltage and (c) load voltage after compensation

using hysteresis control

4) Case 2. Unbalance Voltage Compensation

Reenactment is improved the situation the unbalance voltage

pay by utilizing hysteresis voltage control method. The

voltage waveform with unbalance, reference remunerating

voltage, DVR infused voltage and load voltage after pay as

appeared in Fig.4.6 (a), (b), (c), (d) separately.

(a)

(b)

(c)

(d)

Fig. 4.6 (a): The voltage waveform with unbalance (b)

reference compensating voltage (c) DVR injected voltage

and (d) load voltage after compensation for unbalance

voltage.

5) Case 3. Non-Sinusoidal voltage sag compensation

Simulation is done for the non-sinusoidal voltage sag

compensation by using hysteresis voltage control technique.

The voltage waveform with harmonics, DVR injected voltage

and load voltage after compensation as shown in Fig. 4.15 (a),

(b), (c) respectively.

(a)

(b)

(c)

Fig. 4.7 (a): The voltage waveform with unbalance (b) DVR

injected voltage and (c) load voltage after compensation for

Non-sinusoidal voltage sag

Voltage Quality Improvement by using Advanced Detection Technique of Dynamic Voltage Restorer

(IJSRD/Vol. 6/Issue 05/2018/008)

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Complete Mat lab model of DVR using hysteresis

voltage control is given in Fig.3.18.

Fig. 3.16: MATLAB Model for Implementation of DVR

using Hysteresis Voltage Control

V. CONCLUSION

DVR is an extremely successful custom power gadget for

Compensating power unsettling influences, for example,

voltage droop, voltage swell, lopsided voltage hang, and

voltage list with music. The effect of these unsettling

influences is serious on the power framework, and it makes

disturbances the heap.

As conclusion Dynamic voltage restorers (DVR)

can be utilized to shield touchy hardware from the power

quality aggravations as said in this venture. In all cases it is

required for the DVR control framework to identify begin and

end of a voltage hang and voltage swell and furthermore to

decide the profundity or ascent of voltage droop or voltage

swell separately. The DVR, which is set in arrangement

between supply framework and delicate load must have

dynamic reaction against the aggravations.

REFERENCES

[1] Roger C. Dugan, Mark F. McGranaghan, Surya Santoso,

H. Wayne Beaty, “Electrical Power Systems Quality”,

Chapter 1 & 2 pp. 1-30, Second Edition, Tata McGraw-

Hill, 2004.

[2] M. H. J Bollen, Understanding Power Quality Problems,

Voltage Sags and Interruption, Piscataway, NJ: IEEE

Press, 1999.

[3] S. W. Middlekauff, and E. R. Collins, “System and

customer impact: consideration of series custom power

devices,” IEEE Trans. on Power Delivery, vol. 13, no.1,

pp.278-282, Jan. 1998.

[4] S.S. Choi, J. D. Li and D.M. Vilathgamuwa, “A

generalized voltage compensation strategy for mitigating

the impacts of voltage sags/swells,” IEEE Trans. on

Power Delivery, vol. 20, no.3, pp.2289-2297, July 2005.

[5] IEEE Standards Board (1995), “IEEE Std. 1159-1995”,

IEEE Recommended Practice for Monitoring Electric

Power Quality”. IEEE Inc. New York.

[6] Dr ir Marcel Didden Laboreles;Voltage Disturbances,

consideration for choosing the appropriate sag mitigation

device[LPQI April 2005]

[7] Ian K.P.Ross, MIEE, Omniveter Inc., Voltage sags: An

Explanation- Causes, Effects and Correction-Part-1

[8] John Godsk Nielsen, Michael Newman, Member, IEEE,

Hans Nielsen, and Frede Blaabjerg, Fellow, IEEE

“Control and Testing of a Dynamic Voltage Restorer

(DVR) at Medium Voltage Level” IEEE

TRANSACTIONS ON POWER ELECTRONICS,

VOL. 19, NO. 3, MAY 2004

[9] Hingorani N, Gyugyi L, Understanding FACTS, Wiley

IEEE Press, ISBN 0-7803-3455-8, 1999.

[10] Paisan Boonchiam and Nadarajah Mithulananthan,

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11,No. 3, July-September 2006

[11] H. Ezoji, A. Sheikholeslami, M. Tabasi, M.M. Saeednia

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(2009), pp.152-166 ,© EuroJournals Publishing, K.

Chan, A. Kara, and D. Westermann, "Integrated gate

commutated thyristor based voltage restorer," in 1998

International Conference on Power System Technology,

Beijing, China, 1998, pp. 635-638

[12] N. G. Hingorani, "Power Electronics Applications In

Energy Systems," in NSF Faculty Workshop on

Teaching of Courses in Power Electronics and Electric

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[13] R. McHattie, "Dynamic Voltage Restorer the

Customers's Perspective," in IEE Half Day Colloquium

on Dynamic Voltage Restorer - Replacing Those

Missing Cycles, 1998, pp. 1/1-

[14] S. Chen, G. Joos, L. Lopes, and W. Guo, "A nonlinear

control method of dynamic voltage Restorers," in 2002

IEEE 33rd Annual Power Electronics Specialists

Conference, 2002, pp.

[15] R. Buxton, "Protection from voltage dips with the

dynamic voltage restorer," in IEE Half Day Colloquium

on Dynamic Voltage Restorers - Replacing Those

Injection Transformer

Hysteresis Voltage Crontrol

Sensitive Load

Programmable voltage Source

d-q-0 Transformation

Continuous

In1

Out1Out2Out3Out4

Conn1Conn2Conn3

In1

In2

In3

In4

In5

In6

Out1

Out2

Out3

Out4

Out5

Out6

Out7

Out8

Conn5

Conn7

Conn8

Conn9

Voltage Source Inverter

A1+

A1

B1+

B1

C1+

C1

A2+

A2

B2+

B2

C2+

C2 Vabc

Iabc

A

B

C

a

b

c

Vabc

IabcA

B

C

a

b

c

N

A

B

C

Subtract3

Subtract2

Subtract1

A

B

C

A

B

C

Relay2

Relay1

Relay

NOT

Logical

Operator2

NOT

Logical

Operator1

NOT

Logical

Operator

[A]

Goto

[A]

From