Supply Current Harmonics Control Using Multipulse Converters Current... · conversion, however , full- wave and half wave rectifier are also used up to 120kW ratings. Phase shifting

Supply Current Harmonics Control Using

Multipulse Converters Rinki Jain Deependra Singh, Monesh Jain S.A.T.I. Vidisha Lect, ASCT Bhopal [email protected], [email protected] [email protected], ABSTRACT:-

The three phase multipulse AC-DC

converters are developed for improving

power quality at dc output side and ac

input side. This dissertation deals with

input current shaping of uncontrolled

and controlled rectifier using Multipulse

current shaping concept. The topology

referred to as the multipulse converter,

used as a modular structure where each

power module comprises of a three

phase bridge rectifier (controlled or

uncontrolled), a transformer for 12 pulse

converter and AC and DC side LC

filters. Rectifier used is 6 pulse and 12

pulse uncontrolled and controlled

converter. The performance

improvement of multipulse converter is

achieved in terms of supply power

factor, total harmonics distortion (THD)

in supply current and dc voltage ripples.

Effect of filter in output voltage and

current of inverter is presented in terms

of their THD. Investigations have been

made for different values of LC filter

elements on output current, output

voltage, and supply current and ripple in

dc component. These results confirms

according to IEEE Standard 519-1992.

WHAT ARE MULTIPULSE AC-DC

CONVERTERS

Multi pulse converters are converters

providing more than six pulses of DC

voltage per cycle from AC input. Or the

converter having more steps in AC input

current than that of six pulse bridge

rectifier supply current. Bridge rectifier

is the basic block required for AC- DC

conversion, however , full- wave and

half wave rectifier are also used up to

120kW ratings. Phase shifting

transformers are used to derive multiple

phase supply from three-phase AC

mains using different combinations of

transformer windings such as star, delta,

zigzag, fork, polygon, etc.

The following are multi-pulse converter

are used in paper:

(1) 6 Pulse Converters

(2) 12 Pulse Converters

SIX PULSE DOIDE CONVERTER

In multiples converters server six

pulse diode rectifier all diodes are

connected in parallel. Each rectifier fed

by phase shifted secondary windings

voltages of a transformer to shape the

primary current close to sinusoidal. As

compared to a six - pulse rectifier the

transformer primary current in a

multipulse converter is shaped using

time displaced step wave shaped.

Increasing the number of rectifier raises

the number of steps in the primary

current wave from & produces a sinusoidal

shaped supply current flowing into the

transformer primary winding.

The three - Phase input supply voltage (Van,

Vbn, Vcn) without line impedance drop

could be expresses as

)3.(....................3

2sinVV

)2.(....................3

2sinVV

)1.(..............................sinVV

mcn

mbn

man

t

t

t

The voltage at the input of rectifier (Vsa,

Vsb, and Vsc) can be expressed in equation.

)6.........(..........dt

discL-RsiscVV

)5.......(..........dt

disbL-RsisbVV

)4.......(..........dt

disaL-RsisaVV

scnsc

sbnsb

sansa

The derivative of the load current is:

)7(....................LL2

iRR2V

dt

di

Ls

LLsLLSL

The three phase supply currents

(isa, isb, isc) can be determined for this the

input currents for six conduction

intervals of diode pairs (D1D2, D2D3,

D3D4, D4D5, D5D6 and D6D1) with 600

duration for an interval.

D1

VO

D3 D5

D4 D6 D2

A

BC

Figure: 3-Ø six pulse diode converter

Figure: Voltage waveform for 3- Ø 6-

pulse converter

SIMULATION & RESULT

The simulation block of three-phase

six-pulse diode is shown in further

figures. It consists of three phase ac

source to supply .The line voltage are

Vab, Vbc & Vca.

A RL load is connected across the six-

pulse diode converter. The result can be

visualized through the scope.

It can be observed by seeing waveform

that the distorted input current waveform

is obtained form this converter. It is not

pure sinusoidal the output voltage

waveform contains the ripple in greater

amount & the THD of supply current

also in greater amount. To modify these

waveforms & remove the harmonics,

number of pulse is too increased.

Figure 3 Subsystem of Inverter Side

L, C Filter

Figure: Three Phase six Pulse Diode Converter without filter

Figure: Three Phase Six Pulse Diode Converter with Filter

6-pulse uncontrolled converter

Effect of different output voltage waveform with and without filter

0.45 0.46 0.47 0.48 0.49 0.5-1000

-500

0

500

1000

Time (s)

volta

ge

0 10 20 30 40 500

20

40

60

80

100

Harmonic order

Fundamental (50Hz) = 507.3 , THD= 52.56%

Mag

(% o

f Fun

dam

enta

l)

0 10 20 300

5

10

15

20

25

30

Harmonic order


Mag (

% of

Fund

amen

tal)

(a) Output voltage without filter

0.45 0.46 0.47 0.48 0.49 0.5-1000

-500

0

500

1000

Time (s)

volta

ge

0 10 20 30 40 500

20

40

60

80

100

Harmonic order


Mag

(% o

f Fun

dam

enta

l)

0 10 20 300

1

2

3

Harmonic order


Mag

(% o

f Fun

dam

enta

l)

(b) Output voltage after filter L= 0.5mH, C=700 µf

0.45 0.46 0.47 0.48 0.49 0.5-1000

-500

0

500

1000

Time (s)

volta

ge

0 10 20 30 40 500

20

40

60

80

100

Harmonic order


Mag

(% o

f Fun

dam

enta

l)

0 10 20 300

2

4

6

8

10

Harmonic order


Mag (

% of

Fun

dame

ntal)

(c) Output voltage after filter L= 0.5mH, C=250 µf

0.45 0.46 0.47 0.48 0.49 0.5-1000

-500

0

500

1000

Time (s)

voltg

e

0 10 20 30 40 500

20

40

60

80

100

Harmonic order


Mag

(% o

f Fun

dam

enta

l)

0 10 20 300

0.5

1

1.5

Harmonic order


Mag

(% o

f Fun

dam

enta

l)

(d)Output voltage before filter L= 1mH, C=700 µf

Figure: Different Waveform of Output Voltage of 6- Pulse Controlled Converter (a) Output voltage without filter (b) Output voltage with filter L=0.5mH, C=700 µf (c) Output voltage with filter L=0.5mH, C=250 µf (d) Output voltage with filter L=1mH, C =700 µf

Effect of different output current waveform with and without filter

0.45 0.46 0.47 0.48 0.49 0.5-40

-20

0

20

40

Time (s)

curre

nt

0 10 20 30 40 500

20

40

60

80

100

Harmonic order


Mag

(% o

f Fun

dam

enta

l)

0 10 20 300

1

2

3

4

Harmonic order


Mag (

% of

Fun

dame

ntal)

(a) Output current without filter

0.45 0.46 0.47 0.48 0.49 0.5-40

-20

0

20

40

Time (s)

curr

ent

0 10 20 30 40 500

20

40

60

80

100

Harmonic order


Mag

(%

of F

unda

men

tal)

0 10 20 300

0.2

0.4

0.6

0.8

Harmonic order


Mag

(% o

f Fun

dam

enta

l)

(b) Output current after filter L=0.5mH, C=700 µf

0.45 0.46 0.47 0.48 0.49 0.5-40

-20

0

20

40

Time (s)

curre

nt

0 10 20 30 40 500

20

40

60

80

100

Harmonic order


Mag

(% o

f Fun

dam

enta

l)

0 10 20 300

0.5

1

Harmonic order


Mag (

% o

f Fun

dame

ntal)

(c)Output current after filter L=0.5mH, C=250µf

0.45 0.46 0.47 0.48 0.49 0.5-40

-20

0

20

40

Time (s)

curre

nt

0 10 20 30 40 500

20

40

60

80

100

Harmonic order


Mag

(% o

f Fu

ndam

enta

l)

0 10 20 300

0.2

0.4

0.6

0.8

1

Harmonic order


Mag

(% o

f Fun

dam

enta

l)

(d)Output Current before Filter L=1mH, C= 700 µf

Figure: Different Waveform of Output Current of 6- Pulse Controlled Converter (a) Output Current without Filter (b) Output Current with Filter L=0.5mH, C=700 µf (c) Output Current with Filter L=0.5mH, C=250 µf (d) Output Current with Filter L=1mH, C =700 µf

TWELVE PULSE DOIDE CONVERTER

In the proposed converter circuits Multiples

rectifiers could be connected either in parallel or

in series. The choice of series or parallel

connection depends upon the load voltage

requirement. To connect multiple rectifier units

in a multiples converter circuit, a transformer

with a single primary and multiple isolated

secondary winding is needed. A configuration

(simple, zigzag, and/or multiple sections) of

secondary windings in the transformer magnetic

cores ensures windings produces leading voltage

and the remaining half produces logging voltage

with respect to that of primary winding voltage.

The windings are divided into two equal

numbers to produce the desisted leading &

lagging voltage with respect to primary winding

voltage.

LOAD

iD1

A1

B1C1

A2

C2 B2

iD2

A

CB

D1

VO1

VO2

VO

IP

D'1 D'3 D'5

D'4 D'6 D'2

D3 D5

D4 D6 D2

Figure: Twelve Pulse Diode Converter

with Star Connection Primary

0.7 0.705 0.71 0.715 0.72 0.725 0.73 0.735 0.74 0.745 0.75-400

-300

-200

-100

0

100

200

300

400

time

vs / is

phase difference between voltage and current

Figure: Phase Difference between Voltage and Current in 12-Pulse Uncontrolled Converter

SIMULATION & RESULT

The simulation block of three phase twelve

pulse diode is shown in further figures. It consists

of three phase ac source to supply .The line

voltage are Vab, Vbc & Vca.

Two six pulse diode bridge is connected to the

three phase supply. This is universal thyristor

bridge. The input of these converters is taken from

the output of YgY & YgD transformer. This

configuration provides the phase shift of 30

degrees between the two converters. A RL load is

connected across the six pulse thyristor converter.

The result can be visualized through the scope.

The simulation block of three phase twelve pulse

thyristor is shown in further figures. It consists of

three phase ac source to supply .The line voltage

are Vab, Vbc & Vca. Two six pulse thyristor

bridge is connected to the three phase supply. The

result can be visualized through the scope. It can

be observed by seeing waveform that the input

current waveform is obtained form this converter

are softer than six pulse converter. This is pure

sinusoidal .the output voltage waveform contains

the ripple in lesser than six pulse & the THD of

supply current also in very lesser amount. To

modify these waveforms & remove the harmonics,

number of pulse is too increased.

Figure: Three Phase Twelve Pulse Diode Converter without Filter

Figure: Three Phase Twelve Pulse Diode Converter with Filter

12-pulse uncontrolled converter

Effect of different output voltage waveform with and without filter

0.45 0.46 0.47 0.48 0.49 0.5-400

-200

0

200

400

Time (s)

volta

ge

0 10 20 30 40 500

20

40

60

80

100

Harmonic order


Mag

(% o

f Fun

dam

enta

l)

0 10 20 300

10

20

30

Harmonic order


Mag

(% o

f Fun

dam

enta

l)

(a)Output voltage without filter

0.45 0.46 0.47 0.48 0.49 0.5-400

-200

0

200

400

Time (s)

volta

ge

0 10 20 30 40 500

20

40

60

80

100

Harmonic order


Mag

(% o

f Fun

dam

enta

l)

0 10 20 300

0.5

1

1.5

2

2.5

3

Harmonic order


Mag (

% of

Fun

dame

ntal)

(b) Output voltage with filter with filter L=0.5mH,

C=700 µf

0.45 0.46 0.47 0.48 0.49 0.5-400

-200

0

200

400

Time (s)

Output voltage with filter (L=1mH, C=700uf)

volta

ge

0 10 20 30 40 500

20

40

60

80

100

Harmonic order


Mag

(% o

f Fun

dam

enta

l)

Time (s)

0 10 20 300

0.5

1

1.5

2

Harmonic order


Mag (

% of

Fun

dame

ntal)

(c) Output voltage with filter with filter L=0.5mH, C=250 µf

0.45 0.46 0.47 0.48 0.49 0.5-500

0

500

Time (s)

volta

ge

0 10 20 30 40 500

50

100

Harmonic order


Mag

(% o

f Fun

dam

enta

l)

0 10 20 300

1

2

3

4

Harmonic order


Mag (

% of

Fun

dame

ntal)

(b) Output voltage with filter with filter L=1mH, C=700 µf

Figure: Different Waveform of Output voltage of 12- Pulse Controlled Converter (a) Output Voltage without Filter (b) Output Voltage with Filter L=0.5mH, C=700 µf (c) Output Voltage with Filter L=0.5mH, C=250 µf (d) Output Voltage with Filter L=1mH, C=700 µf

Effect of different output current waveform with and without filter

0.45 0.46 0.47 0.48 0.49 0.5-20

-10

0

10

20

Time (s)

curre

nt

0 10 20 30 40 500

20

40

60

80

100

Harmonic order


Mag

(%

of F

unda

men

tal)

0 10 20 300

1

2

3

4

Harmonic order


Mag

(% o

f Fun

dam

enta

l)

(a) Inverter output current without filter

0.45 0.46 0.47 0.48 0.49 0.5-20

-10

0

10

20

Time (s)

Output current with filter (L=0.5mH, C=700uf)

curr

ent

0 10 20 30 40 500

20

40

60

80

100

Harmonic order


Mag

(%

of

Fun

dam

enta

l)

0 10 20 300

0.2

0.4

0.6

0.8

Harmonic order


Mag

(% o

f Fun

dam

enta

l)

(b) Output current with filter L=0.5mH, C=700μf

0.45 0.46 0.47 0.48 0.49 0.5-20

-10

0

10

20

Time (s)

Output current with filter (L=.5mH, C=250uf)

curr

ent

0 10 20 30 40 500

20

40

60

80

100

Harmonic order


Mag

(%

of F

unda

men

tal)

0 10 20 300

0.5

1

Harmonic order


Mag (

% of

Fun

dame

ntal)

(c) Output current with filter L=0.5mH, C=700μf

0.45 0.46 0.47 0.48 0.49 0.5-20

-10

0

10

20

Time (s)

curre

nt

0 10 20 30 40 500

20

40

60

80

100

Harmonic order


Mag

(% o

f Fu

ndam

enta

l)

Time (s)

0 10 20 300

0.2

0.4

0.6

0.8

1

Harmonic order


Mag

(% o

f Fun

dam

enta

l)

(d) Output current with filter L=1mH, C=700μf

Figure: Different Waveform of Output Current of 12- Pulse Controlled Converter

(a) Output Current without Filter (b) Output Current with Filter L=0.5mH, C=700 µf (c) Output Current with Filter L=0.5mH, C=250 µf (d) Output Current with Filter L=1mH, C=250µf

COMPARISON BETWEEN 6- PULSE AND 12- PULSE CONVERTER

0.45 0.46 0.47 0.48 0.49 0.5-40

-20

0

20

40

Time (s)

curre

nt

0 10 20 30 40 500

20

40

60

80

100

Harmonic order


Mag

(% o

f Fun

dam

enta

l)

0 10 200

5

10

15

Harmonic order


Mag

(% o

f Fun

dam

enta

l)

(a) Input supply current of 6- pulse converter

0.45 0.46 0.47 0.48 0.49 0.5-40

-20

0

20

40

Time (s)

curre

nt

0 10 20 30 40 500

20

40

60

80

100

Harmonic order


Mag

(% o

f Fun

dam

enta

l)

0 10 20 300

0.5

1

1.5

Harmonic order


Mag

(% o

f Fun

dam

enta

l)

(b) Input supply current of 12- pulse converter

Figure: Different Waveform of Supply Current Wavefrom of 6- Pulse and 12-Pulse Uncontrolled Converter

0.45 0.46 0.47 0.48 0.49 0.5-400

-200

0

200

400

Time (s)

volta

ge

0 10 20 30 40 500

20

40

60

80

100

Harmonic order


Mag

(% o

f Fun

dam

enta

l)

0 10 20 30 400

0.02

0.04

0.06

0.08

0.1

0.12

Harmonic order


Mag

(% o

f Fun

dam

enta

l)

(a) Input supply voltage of 6- pulse converter

0.45 0.46 0.47 0.48 0.49 0.5-400

-200

0

200

400

Time (s)

volta

ge

0 10 20 30 40 500

20

40

60

80

100

Harmonic order


Mag

(% o

f Fun

dam

enta

l)

0 10 20 300

0.005

0.01

0.015

0.02

Harmonic order


Mag

(% o

f Fun

dam

enta

l)

(b) Input supply voltage of 12- pulse converter

Figure: Different Waveform of Supply Voltage of 6- Pulse and 12-Pulse Uncontrolled Converter

D.C. VOLTAGE WAVEFORM OF 6-PULSE AND 12- PULSE CONVERTER

0 0.1 0.2 0.3 0.4 0.50

500

1000

Time (s)

D.C.Voltage

vo

ltage

DC component = 591.2 , THD= 0.88%

DC Component value is 591.2volt (a) Input supply voltage of 6-pulse converter

0 0.1 0.2 0.3 0.4 0.50

100

200

300

400

Time (s)

D.C. Voltage

voltage

DC component = 390.1 , THD= 1.41%

DC Component value is 390.2volt (b) Input supply voltage of 12 – pulse converter

Figure 16 Different Waveform of D.C.Voltage of 6- Pulse and 12-Pulse Uncontrolled Converter

D.C. RIPPLE COMPONENT OF 6-PULSE AND 12- PULSE CONVERTER Table 1 D.C. voltage of 6- Pulse and 12-Pulse Controlled Converter

D.C. capacitor In µf

6- pulse D.C. ripple component

12- pulse D.C. ripple component

500 8 5 600 6 4 700 5.4 3.5 800 4.1 3 900 4 2.1 1000 3 2

0

1

2

3

4

5

6

7

8

9

500 600 700 800 900 1000 1100

capacitor

D.C

.rip

ple

com

pone

nt

6-pulse ripple

12-pulse ripple

Figure: D.C. voltage ripples of 6- Pulse and 12-Pulse Controlled Converter

SUPPLY CURRENT OF 6-PULSE AND 12- PULSE CONVERTER Table 2 Input Supply Current of 6- Pulse and 12-Pulse Controlled Converter

Capacitor in μf

Is for 6-pulse (L=0.5mH)

Is for 6-pulse (L=1mH)


Is for 12-pulse (L=0.5mh)



100 22.81 22.61 22.54 2.05 2.04 2.16

250 22.67 22.70 22.85 2.05 2.06 2.07

450 22.72 22.84 23.08 2.07 2.09 2.10 550 22.76 22.9 23.22 2.07 2.09 2.13

650 22.80 22.99 23.38 2.08 2.06 2.16

700 22.81 23.02 23.23 2.07 2.10 2.18

converter

1

5

9

13

17

21

25

0 100 200 300 400 500 600 700 800

Capacitor

Su

pp

ly c

urr

en

t T

HD

6-pulse Is L=0.5

6-pulse Is L=1

6-pulse Is L=2

12-pulse Is L=0.5

12-pulse Is L=1

12-pulse Is L=2

Figure: Input Supply Current of 6- Pulse and 12-Pulse Controlled Converter

COMPARISON OF MULTIPULES CONVERTER WITH PASSIVE FILTER Table 3Effect of different capacitor values in six and twelve pulse uncontrolled converter parameters when (L=0.5mH)

L=0.5mH C= 100µf

C= 250µf

C= 450µf

C= 550µf

C= 650µf

C= 700µf

Fund(A) 18.46 23.29 37.91 46.26 55.64 60.35 Iio THD% 541.2 245.45 165.10 107.53 96.56 81.63

Fund(A) 20.59 20.72 20.91 21.01 21.12 21.17 Io THD% 7.44 1.67 4.00 1.01 2.49 1.17

Fund(V) 509.3 508.6 508.5 508.5 508.5 508.5 Vio THD% 52.8 52.69 52.68 52.68 52.58 52.66

Fund(V) 508.3 511.9 516.5 519.2 522 523.3 Vo THD% 61.62 13.10 11.72 5.46 12.98 4.08

Fund(V) 357.7 357.7 357.7 357.7 357.7 357.7 Vs THD% 0.38 0.38 0.38 0. 38 0.38 0.38

Fund(A) 31.11 30.45 30.75 30.89 31.07 31.11 Is THD% 22.81 22.67 22.72 22.76 22.80 22.81

6-PULSE UNCONTROLLED RECTIFIER WITH

AC SIDE LC FILTER

Vd DC comp Fund(V)

591.2 591.2 591.2 591.2 591.2 591.2

Fund(A) 12.17 15.25 24.94 30.76 36.42 39.47 Iio THD% 568.82 246.17 160.34 106.07 94.60 80.86

Fund(A) 13.54 13.66 13.76 13.86 13.86 13.89 Io THD% 7.33 1.62 3.68 1.38 2.23 0.94

Fund(V) 336.5 335.5 334.6 334.2 334 333.6 Vio THD% 52.57 52.7 52.69 52.67 52.65 52.56

Fund(V) 336.2 338.3 340.7 342.1 343.1 343.9 Vo

THD% 61.24 12.95 12.37 5.15 11.40 4.25 Fund(V) 358.1 358.1 358.1 358.1 358.1 358.1 Vs

THD% 0.03 0.03 0.03 0.03 0.03 0.03 Fund(A) 21.58 21.79 21.92 21.97 22.05 22.08 Is

THD% 2.05 2.05 2.07 2.07 2.08 2.07


AC SIDE LC FILTER

Vd DC comp Fund(V)

390.1 390.1 389.1 388.6 388.1 387.9

Table 4 Effect of different capacitor values in six and twelve pulse uncontrolled converter parameters when (L=1mH)

L=1mH C=

100µf C=

250µf C=

450µf C=

550µf C=

650µf C=

700µf Fund(A) 18.38 23.38 38.53 47.57 57.12 62.06 Iio THD% 166.32 107.36 111.26 50.16 41.17 38.29 Fund(A) 20.53 20.83 21.26 21.48 21.7 21.86 Io THD% 2.18 1.06 7.20 0.82 0.72 1.0 Fund(V) 508 507.9 507.7 507.9 507.9 507.9 Vio THD% 52.63 52.62 52.61 52.62 52.62 52.62 Fund(V) 507.2 515 525.1 530.3 535.8 538.5 Vo THD% 17.49 5.59 12.81 2.60 2.12 2.17 Fund(V) 357.5 357.6 357.7 357.5 357.7 357.7 Vs THD% 0.39 0.40 0.41 0.41 0.41 0.41


AC SIDE LC FILTER Is Fund(A) 30.14 30.59 31.28 31.54 31.9 32.05

THD% 22.61 22.70 22.84 22.9 22.99 23.02 Vd DC

comp 591.3 591.2 591.2 591.2 591.2 591.2

Fund(A) 12.15 15.37 25.28 30.97 37.38 40.41 Iio THD% 166.35 108.05 107.5 50.11 41.44 38.66 Fund(A) 13.58 13.37 13.93 14.04 14.15 14.21 Io THD% 2.20 1.13 6.89 0.77 0.91 1.18 Fund(V) 335.9 334.7 332.8 332.1 331.2 330.8 Vio THD% 52.63 52.56 52.48 52.56 52.61 52.56 Fund(V) 335.9 339.7 344.8 347.4 350.3 351.6 Vo THD% 17.50 6.15 12.17 2.73 2.41 2.55 Fund(V) 358.8 358.1 358.1 358.1 358.1 358.1 Vs THD% 0.03 0.03 0.03 0.03 0.03 0.03 Fund(A) 21.66 21.85 22.14 22.26 22.35 22.48 Is THD% 2.04 2.06 2.09 2.09 2.06 2.10


AC SIDE LC FILTER

Vd DC comp Fund

391 389.6 387.4 386.6 385.6 384.9

Table 5 Effect of different capacitor values in six and twelve pulse uncontrolled converter parameters when (L=2mH)

L=2mH C=

100µf C=

250µf C=

450µf C=

550µf C=

650µf C=

700µf Fund(A) 18.34 23.69 39.9 49.84 60.69 66.18 Io THD% 70.06 57.41 28.76 22.88 20.38 20.94 Fund(A) 20.5 21.12 22.02 22.5 23.06 23.27 Iio THD% 1.08 1.31 0.32 0.27 1.60 2.38 Fund(V) 507.6 507.2 507.6 507.6 507.5 504.4 Vo THD% 52.56 52.58 52.58 52.56 52.57 52.88 Fund(V) 506.9 522.2 543.8 555 565.4 573.6 Vio THD% 7.26 2.68 1.58 1.89 4.36 4.12 Fund(V) 357.5 357.7 357.6 357.6 357.5 357.5 Vs THD% 0.42 0.38 0.39 0.39 0.42 0.42 Fund(A) 30.09 31.21 32.39 33.14 33.99 34.54 Is THD% 22.54 22.85 23.08 23.22 23.38 23.23


AC SIDE LC FILTER

Vd DC comp Fund

591.3 591.2 591.1 591 590.9 590.9

Fund(A) 12.13 15.56 25.98 32.2 38.95 42.13 Iio THD% 70.10 51.14 28.74 22.88 20.35 20.82 Fund(A) 13.56 13.87 14.25 14.54 14.8 14.82 Io THD% 1.07 1.24 0.39 0.29 1.59 2.32 Fund(V) 335.8 333.3 328.2 327.9 325.8 321.2 Vio THD% 52.59 52.59 52.57 52.56 52.57 52.88 Fund(V) 335.6 342.8 352.5 359.6 365.1 364 Vo THD% 7.44 2.67 1.51 1.45 4.38 4.96 Fund(V) 358 358.1 358.1 358.1 358 358 Vs THD% 0.03 0.03 0.03 0.03 0.01 0.01 Fund(A) 22.02 22.03 22.58 22.71 23.25 23.71 Is THD% 2.16 2.07 2.10 2.13 2.16 2.18


AC SIDE LC FILTER

Vd DC comp Fund

379.2 388.3 382.2 381.7 379.2 376.3

CONCUSION:-

In this paper following objectives are fulfilled:

1. The various characteristics of

multipulse converter are obtained

from the simulation. With increase

in the number of pulses,

harmonics in AC input quantities

are reduced considerably. This has

been obtained from the simulation.

Compared to six pulse Thyristor /

Diode converter in twelve pulse

Thyristor / Diode converter

a) The ripple in Vd is decreased

b) The Total Harmonics

Distortion in supply current

,supply voltage , output

voltage ,output current is

decreased

c) Shape of the primary current

changes from non- sinusoidal

to closed sinusoidal

2. In order to increase pulse in the

converter circuit, additional

bridges and corresponding phase

shifting transformers are required

due to which the VA rating of

converter is increased. It can be

used in large range for large range

with same model.

3. Work has been carried out for

different values of L and C

parameter of LC filter to eliminate

/ reduce harmonics. Results have

been shown in tables and graph.

On effect the value of Capacitor :

a) The fundamental value of

inverter output current is

increased with increasing

value of capacitor.

b) The fundamental value of

output current is increased

with increasing value of

capacitor.

c) The fundamental value of

output voltage is increased

with increasing value of

capacitor.

d) The total harmonics distortion

of output current is decreased.

e) The total harmonics distortion

of output voltage is decreased

or increased with particular

value of L and C. it not

depends only increasing the

value of C and L.

f) The total harmonics distortion

of output current is decreased

or increased with particular

value of L and C. it not

depends only increasing the

value of C and L.

Elimination of specified

harmonics LC filter has been

analyzed for different resonating

frequency. From this study, it is

observed that lower order

harmonics have been eliminated

from output Voltage and current

of converter. Results have shown

in graph.

BIBLIOGRAPHY

[1] Grade “Analysis of Steady

State Operation of Three Phase Six -Pulse

Line Commutated Converter”, Appendix 3

operation of six pulse line commutated

converters, June 2005.

[2] Yeddo B. Blauth, IVO Barbi, “A

Phase Controlled Twelve Pulse

Rectifier without Phase Shifting

Transformer”, IEEE Transaction,

P.o-7803, September 1998.

[3] Unknown, “Introduction to

Different Types of Harmonic

Reduction Technique”

[4] Dr.P.S.Bhimrao, “Power

Electronics”, Khanna publications,

New Delhi.

[5] Mohammad H. Rasheed “Power

Electronics – Circuit, Devices &

Application”, Third Edition, 2004

[6] G.K.Dubey ,S.R.Doradla, A joshi,

Rmk sinha ,“ Thyristored Power

Controllers”, New Age

International publishers, July 1996.

[7] Ned Mohan, Undeland, Robbins,

“Power Electronics – Converters

Application & Designs”, Second

Edition.

[8] S.Rao, HV-AC, HVDC –

Transmission & distribution

Engineering”, Khanna

publications, 1999.

[9] “Matlab users guide”, Math books.

Inc. Corporation

[10] M.S.Berde, “Thyristor”, Fourth

Edition, Jan’1986

[11] Rajib Datta, Haiqing Weng,

Kunlun Chen, Allen M.Ritter,

Ravisekhar Raju “Multipulse

Converter – Topology and Control

for Utility Conversion”

[12] Rajaa Labaki, Bachir Kedjar and

Kalam Al-Haddad “Single-Phase

Active Front End Converter with

Series Compensation” IEEE

[13] Katsunori Taniguchi Yasumasa

Ogino and Kiyoshi Ohishi “Novel

PWM Strategy for Power Mosfet

Converter” Osaka 535” Japan.

ISIE 2006, July 9-12.2006.

Montreal, Quebec, Canada.

[14] P.K.Chaturvedi, Shailendra Jain,

K.C.Pradhan and Veshali Goyal

“Multi-Pulse Converters as A

Viable Solution for Power Quality

Improvement”

[15] Bhim Sen Senior Member ,IEEE,

G. Bhuvaneswari, Senior Member

,IEEE, and Vipin Garg Member

,IEEE, “Harmonic Mitigation

Using 12-Pulse AC-DC Converter

in Vector-Controlled Induction

Motor Drive” IEEE Transactions,

On Power Delivery, Vol.21 No.3

July 2006.

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Supply Current Harmonics Control Using Multipulse Converters Current... · conversion, however , full- wave and half wave rectifier are also used up to 120kW ratings. Phase shifting