Thesis Ebe 2010 Oyedokun d

BY: DAVID TEMITOPE OYEDOKUN

DEPARTMENT OF ELECTRICAL ENGINEERING UNIVERSITY OF CAPE TOWN

This thesis was submitted to the University of Cape Town in fulfilment of the academic

requirements for the Masters of Science degree in Electrical Engineering

Power flow and rotor angle stability studies of HVAC-HVDC power system interconnections using DigSILENT

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-86

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Time (sec)

Rot

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(deg

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B;

+ 89"/

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1 E'%#

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0 1 2 3 4 5 6 7 8 9 100.99

1

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1.05

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1.07

Time (sec)

Term

inal

vol

tage

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B%

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0 2 4 6 8 10 12 14 16 18 200

500

1000

1500

2000

2500

3000

Time (sec)

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ive

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BD

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0 1 2 3 4 5 6-1000

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0

500

Time (sec)

Rea

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G2: Reactive Power during 3-phase Fault at G1

1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3-79

-78.5

-78

-77.5

-77

-76.5

Time (sec)

Rot

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BE

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0 1 2 3 4 5 6 7 8 9 10 11-0.2

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1

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Term

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Vol

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BB

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0 2 4 6 8 10 12 14 16 18 200

500

1000

1500

2000

2500

Time (sec)

Act

ive

Pow

er (M

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G1: Active power during 3-phase fault at G1

0 5 10 15 20

-200

0

200

400

600

800

1000

1200

Time (sec)

Rea

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G1: Reactive power during 3-phase fault at G1


B:

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0 5 10 15 20 25-170

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:(

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0 2 4 6 8 10 12 14 16 18 20-500

0

500

1000

1500

2000

2500

Time (sec)

Act

ive

pow

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0 2 4 6 8 10 12 14 16 18 20 220.94

0.95

0.96

0.97

0.98

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1

1.01

1.02

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Term

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200

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Time (sec)

Rea

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G2: Reative Power during 3-phase Fault at G1


:'

4) -:((,-'%(,-:%(,

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both the HVAC and the HVDC transmission lines between bus six and bus five is 85 MW

(i.e. losses on HVDC 1005-975=30 MW, losses on HVAC= 995-940=55MW) and it is higher

than the loss in case one (56MW).


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0 10 20 30 40 50 60 70 80-200

-150

-100

-50

0

50

100

150

200

Time (sec)

Rot

or a

ngle

(deg

)

G3 Rotor angle During Rectifier and Inverter Fault

Rectifer FaultInverter Fault


)(:

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0.8 1 1.2 1.4 1.6 1.8 2

0.65

0.7

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0.8

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0.9

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1

1.05

Time (sec)

Term

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vol

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G3 Terminal voltage During Rectifier and Inverter Fault



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0

500

1000

1500

2000

2500

3000

Time (sec)

Act

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Pow

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W)

G3 Active Power During Rectifier and Inverter Fault



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0.9 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9-500

0

500

1000

1500

2000

2500

3000

3500

Time (sec)

Rea

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e P

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(Mva

r)

G3 Reactive Power During Rectifier and Inverter Fault



))'

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0 1 2 3 4 5 6 7 8-87.2

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-87

-86.95

-86.9

-86.85

Time (sec)

Rot

or a

ngle

(deg

)

G2 Rotor angle During Rectifier and Inverter Fault



))@

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0 1 2 3 4 5 6 7 8 9 100.995

1

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1.01

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1.02

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1.03

1.035

1.04

Time (sec)

Term

inal

vol

tage

(pu)

G2 Terminal Voltage During Rectifier and Inverter Fault


0.5 1 1.5 2 2.5 3 3.5 4

400

600

800

1000

1200

1400

1600

Time (sec)

Act

ive

pow

er (M

W)

G2 Active power During Rectifier and Inverter Fault



));

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0.5 1 1.5 2 2.5 3

-200

-100

0

100

200

300

400

500

Time (sec)

Rea

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wer

(Mva

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0 5 10 15 20 25 30 35 40-55

-50

-45

-40

-35

-30

Time (sec)

Rot

or a

ngle

(deg

)

G3 Rotor Angle During Rectifier and Inverter Fault



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0 0.5 1 1.5 2 2.5 3 3.5 40.65

0.7

0.75

0.8

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0.9

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1

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Time (sec)

Term

inal

vol

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(pu)




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& B)@/'32/& 4@

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0.5 1 1.5 2 2.5 3 3.5 4 4.5 50

500

1000

1500

2000

2500

3000

3500

Time (sec)

Act

ive

Pow

er (M

W)



0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4

0

500

1000

1500

2000

2500

3000

3500

Time (sec)

Rea

ctiv

e P

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(Mva

r)




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0 5 10 15 20 25-87.05

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-86.9

-86.85

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Time (sec)

Rot

or a

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(deg

)

G2 Rotor Angle During Rectifier and Inverter Fault



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& B)D/'32/& #94'

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0 5 10 15 20 25 300.99

0.995

1

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1.02

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Time (sec)

Term

inal

vol

tage

(pu)



0 2 4 6 8 10 12 14200

300

400

500

600

700

800

900

1000

1100

1200

1300

Time (sec)

Act

ive

Pow

er (M

W)




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0 5 10 15 20 25 30-150

-100

-50

0

50

100

150

200

250

300

350

Time (sec)

Rea

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(Mva

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G2 Reactive Power During Rectifier and Inverter fault



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0 1 2 3 4 5 6 7 8-87.2

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Time (sec)

Rot

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)

G2: Rotor Angle During 3-phase Fault at G4


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0 2 4 6 8 10 12 14 16 18 200.995

1

1.005

1.01

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1.03

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Time (sec)

Term

inal

vol

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(pu)

G2: Terminal Voltage During 3-phase Fault at G4


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& B'' 4'

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'%((,A# "/

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0 1 2 3 4 5 6 7 8200

400

600

800

1000

1200

1400

1600

Time (sec)

Act

ive

Pow

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G2: Active Power During 3-phase Fault at G4


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0 0.5 1 1.5 2 2.5 3-300

-200

-100

0

100

200

300

400

500

Time (sec)

Rea

ctiv

e P

ower

(Mva

r)

G2: Reactive Power During 3-phase Fault at G4

0 10 20 30 40 50 60 70 80-200

-150

-100

-50

0

50

100

150

200

Time (sec)

Rot

or a

ngle

(deg

)



)'%

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0.5 1 1.5 2

0.4

0.5

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0.7

0.8

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Time (sec)

Term

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vol

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(pu)



)'D

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0 1 2 3 4 5 60

200

400

600

800

1000

1200

Time (sec)

Act

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pow

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)'E

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8%1%1%1 "1>*$($ ") ""

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87

;(

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0.5 1 1.5 2 2.5-200

0

200

400

600

800

1000

1200

1400

1600

1800

2000

Time (sec)

Rea

ctiv

e P

ower

(Mva

r)

G3: Reactive Power During 3-phase fault at G4


)'B

.$8%17"1>#! 430".! !0!$ 1

& B'B/'324;@-& #94'

0 5 10 15 20 25 30-87

-86.98

-86.96

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-86.9

-86.88

-86.86

-86.84

-86.82

-86.8

Time (sec)

Rot

or a

ngle

(deg

)


0 5 10 15 20 25 30 35 400.975

0.98

0.985

0.99

0.995

1

1.005

1.01

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Time (sec)

Term

inal

Vol

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(pu)



)':

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89"/

0 5 10 15 20 25 30 35200

300

400

500

600

700

800

900

1000

1100

1200

1300

Time (sec)

Act

ive

Pow

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G1 Reactive Power During Reactifier and Inverter Fault


Documents

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