hvdc converter station layout

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Station Design& Layout

Kjell Eriksson

Project Manager

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Simplified single line diagram bipolar converter station

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Converter transformer allocation

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Inside view of Valve Hall

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Monopolar converter station

210 m

4,5 m265 m

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Layout of a bipolar converter station of 500 kV, 2000 MW

330 m

385 m

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DC switchyard

The DC switchyard contains all the external equipment neededfor an HVDC transmission: Voltage dividersCurrent measuring devicesSmoothing ReactorsDC Filters

Transmissions with cables (underground or underwater) doesnot require any DC filter. Transmissions with OH typicallyrequire DC filters to prevent the harmonics generated by the converter to be transported along the DC line. A harmonic filter for 12th and a high pass is usually enough.

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Substation Earthing

The converter station is connectedwith the earth in a grid of groundwires (cu).

All apparatus and structures are connected to the earthing gridfrom the station as a securitymeasure.

Prevents dangerous potentials to establish in occurrances of lightnings, short circuits and transitional currents at commutations

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Protection against lightning

The apparatus in the converter station are protected againstlightning by a network of shield wires

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System bus

The buses are fixed or flexible. Connection joints are designed to withstand forces of short circuits, the earthquakes, and the winds and loads of ice. The telescopicconnection between the valves is particularly capable to withstand seismic forces.

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Typical HVDC Station

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Layout of Monopolar Station

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Layout of Bipolar station

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Valve hall Fire protection

Recommended fire protectionDeluge system for transformersInergen fire fighting, valve hall

Water mist systemSmoke detectionFlame detection

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Acoustic design

Calculation regarding sound levels

Specify requirements regarding noise levels for apparatus

Specify noise limiting measures (screening)

Measurement and analysis of sound levels

FILTER 24/36

FILTER 24/36

FILTER 24/36

FILTER 11/13

FILTER HP3 FILTER 11/13

FILTER 11/13

FILTER HP3

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Scale 1:344600 15 30 60 90 120m

Longquan (5)

LegendIndustrial sources point

Industrial sources line

Industrial sources area

Main building

Screening edge

Noise levelin dB(A)

<= 45.045.0< <= 47.547.5< <= 50.050.0< <= 52.552.5< <= 55.055.0< <= 57.557.5< <= 60.060.0< <= 62.562.5< <= 65.065.0< <= 67.567.5< <= 70.070.0< <= 72.572.5< <= 75.075.0< <= 77.577.5< 80.080.0<

SoundPLAN

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Calculations with SoundPLAN

•Data in 3D model

•Data required•Arrangement of station and ambient location

•Buildings

•Sound sources

•Sound potential

•Location and extension

•Frequency content

•Directivity

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All transformers boxed in

800 kV converter

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Verification of earthquake design

The verification is basically by calculations of earthquake forces.

A simple mechanical testing is often done to measure mechanicaldamping and resonance.

In special cases it is tested in a vibration table.

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Earthquake

In the New Zealand projectequipment withstand 0.5 g

Some components are suspended, for examplethyristor valves and DC filter capacitors.

Transformer and wallbushings are specificallydesigned for earthquake

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Itaipú

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Longquan Converter Station, Panorama View

Converter Station size: 600m x 360m

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Longquan AC Filters

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Three Gorges – Guangzhou, Jingzhou

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Double Valves 500 kV DC, Zhengping

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Longquan - Double Valves & Converter Transformers

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Chandrapur site

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Chandrapur ac yard

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Baltic Cable, Kruseberg

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Baltic cable, ac side

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Baltic Cable, dc yard

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New Zealand, ac filters

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New Zealand, dc filter

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New Zealand, sound barriers

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New Zealand, smoothing reactor

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New Zealand, valve hall

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Brazil - Argentina, Modular valve housings

Converter Transformers including one spare

Capacitors for CCC

Modular ValveHousings

Cooling Towers

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