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THE ITAIPU HVDC SCHEME

 

 

Between:      Foz do Iguaçu at the border of Brazil and Paraguay to Sao Paulo, Brazil

 

Power Co.:    Furnas Centrais Elétricas S.A. Brazil

 

Manufacturer: ASEA Promon HVDC consortium, formed by ASEA Sweden, ASEA Elétricas Ltda, Brazil and Promon Engenharia S.A. Brazil

 

Commissioned:

             

    Bipole 1. 1. stage: ± 300 kV, 1575 MW in July   1984

2. stage: + 300kV,2362.5 MW in April  1985   

          - 600 kV

3. stage: ± 600 kV, 3150 MW in May    1986

 

              4.stage: ± 300 kV, 1575 MW    { commissioned

   Bipole 2.  5.stage: + 300 kV, 2362,5 MW  { at the  

                       - 600 kV             { same time by   

              6.stage: ± 600 kV, 3150 MW    { August, 1987 

 

 

Main purpose:      Bulk power supply from the great Hydro Power station (12600 MW) at Foz do Iguaço to the São Paulo industrial area. The power is generated by 18 hydro generators, nine of them are designed for 60 Hz with a capacity of 765 MVA, P.F. = 0,95 and the other nine are designed for 50 Hz with a capacity of 823 MVA, P.F. = 0,85 supplying the HVDC system.

 

Main data:    The HVDC system consists of two bipolar transmission systems, each one designed for 3150 MW at ± 600 kV D.C. and 2625 A.

 

              overload capacity:  5 seg. ------- 3260 Amp.

                                 20 seg. ------- 3000 Amp.

 

A.C. networks:

              24 single three phase winding converter transformers are used at each terminal which means three transformers/12 pulse unit, forming four converters per bipole.

 

              Foz do Iguaçu: 50 Hz, 314 MVA

                             500/_ 3 kV+20 x 1,25 % kV

                     - 6

              min. short circuit capacity: 16373 MVA

 

 

 

                   Sao Rogue: 60 Hz, 300 MVA

              345/Ö 3 kV+20 x 1,25 % kV

                          - 6   

              min. short circuit capacity: 7800 MVA (light road)

 

 

Synchronous

Compensator:  Sao Roque - 4 x 330 MVAr

 

AC filters:   Harmonic filters are provided at the 50 Hz and 60 Hz side. Shunt capacitor bank only at the 60 Hz side

 

 

 

 

         50 Hz Side - FOZ DO IGUACU

 

         AC FILTERS

 

             

TYPE

HARMONIC

MVAr

UNITS

TOTAL

1

3º/5º.11º/13º. HP1A,HP1B

 349.0

2

 698.0

2

11º/13º. HP2

 280.3

3

 840.0

 

 

 

TYPE 1

    

 

 

 

 TYPE 2

 

COMPON.

3º/5º

11º/13º

  HP1A

  HP1B

11º/13º

HP2

C1(µF)

   0.814

   1.691

   0.916

   0.929

   1.691

   1.858

L1(mH)

 830.0

  41.95

  19.86

   7.715

  41.95

   9.41

C2(µF)

   2.986

  49.15

    -

    -

  49.15

    -

L2(mH)

 226.6

   1.44

    -

    -

   1.44

    -

R(ohms)

2930.0

   0.444

1060.0

  305.0

   0.444

 170.0

MVAr

  70

 134.3

  72

   72.7

 134.3

 146.0

 

 

         60 Hz Side - SAO ROQUE

 

          AC FILTERS

 

 

HARMONIC

MVAr

UNITS

TOTAL

 11º. 13º

220.8

3

662.4

 11º. 13º. 3º/5º

279.8

1

279.8

 3º/5º. HP2

296.0

1

296.0

 HP1

237.0

4

948.0

 HP2

296.3

1

296.3

 

 

 

 

COMPON.

3º/5º

11º

13º

HP1

HP2

 C1(µF)

   1.160

   2.417

   2.468

   5.273

   6.591

 L1(mH)

 405.0

  24.06

  16.87

   2.318

   2.318

 R(ohms)

2500

3990

3300

  46.76

  46.76

 C2(µF)

   4.281

    -

    -

    -

    -

 L2(mH)

 110.1

    -

    -

    -

    -

 MVAr

  59.0

  109.4

 111.4

 237.0

  296.3

 

              Shunt capacitor bank:

                        2 x 294,0 MVAr, 6,45 µF

 

 

HVDC System:  Route length:

              Bipole 1 (South Line): 807 km

              Bipole 2 (North Line): 818 km

 

             

Overhead lines:

              Conductors: 4 x 689 mm2 ACSR (1272 MCM)

 

              Shielding:7 strand, galvanized steel wire 9.5mm)

 

              Line towers: 23 % are selfsupported and 77 % are guyed lattice steel structures

              The two bipolar line systems are separated 10 km from each other as a minimum.

 

Electrodes:   The electrode switching houses are situated far from the stations:

 

              Foz do Iguaçu: Bipole 1: 15,5 km

                             Bipole 2: 16 km

 

              San Roque:     Bipole 1: 67,2 km

                             Bipole 2: 66 km

 

              conductors type: 2 x 689 mm2, 1272 MCM

 

D.C. Filters:

 

 

 

 

BANK

TUNING

 

 

 

 

 

STATION

BRANCH

CAPACITANCE

FREQUENCY

CH

L1

R1

C1

LH

 

 

(µF)

(HZ)

(µF)

(mH)

(ohms)

(µF)

(mH)

 Foz do

2º/6º

    0.533

  100/300

  0.500

 2111.0

  23.0

 0.533

 1267.0

 Iguacu

12º

    0.715

  600

  1.285

    -

   1.32

 0.715

   35.04

 

HP

    1.570

 1200

  1.010

    -

 660.0

    -

   17.42

 

2º/6º

    0.558

  120/360

  0.523

 1401.0

  18.0

 0.5579

  841.0

S. Roque

12º

    0.878

  720

  0.828

    -

   1.29

 0.8753

   28.42

 

HP

    1.570

 1440

  1.570

    -

 210.0

    -

    7.78

 

 

HVDC Valves: The Itaipu HVDC System uses thyristor valves, indoor type, water cooled and isolated by air. Mechanically, the valves are built up as quadruple-valves forming a converter. One single valve is made up of 8 thyristor modules series connected, containing 12 thyristors with voltage dividers and control circuits.

 

 

 

 

 

References :

 

 

 

 

System correspondent :

 

Mr Antonio Joäo DIRENE

Superintendencia de Transmissao

Furnas Centrais Eletricas S.A.

Real Grandeza 219, Sala 1206, Bloco A

22283 RIO DE JANEIRO RJ

BRAZIL

 

Telex :     021 21 21166 / 21239

Telephone : (55) 021 536 3112

            ext. 5615 or 5701

              Telefax :   (55) 246 5389

                               226 7005