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State Grid Corporation of ChinaJan.2009 India

Innovations in the engineering of ±800kV UHVDC in China

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1. Project introduction2. Technical features and innovations3. Conclusion

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工程示意图

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Construction site of converter station

Transmission line construction

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Typetest of the 800kV and 600kV upper transformer were passed in Nov.2008 and Jan. 2009 respectively.

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Typetest of the 6’’ thyristor was passed.Manufacture of valve module and test of the valve is ongoing.

Test of 800kV/4000A smoothing reactor was passed.

Bypass CB

Disconnector

RI capacitorDC Divider

Composite support insulator

DC yard equipment are successfully manufactured and energised for one year.

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According to the national regulation, the audible noise limitation at the boundary of station is: Daytime not exceed 60dB(A) ， Night time 50dB(A) 1. Movable BOX-IN for the converter transformer;

11 ．． Sound damping of the converter stationSound damping of the converter station

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2. Layout:Face to face arrangement for the HV and LV valve hall, back to back for the two LV valve halls and AC filter grid type arrangement is well designed to damp noise and save land as much as possible.

3. Sound-proof screen along part of the station boundary

4. Smoothing 4. Smoothing reactor:reactor:Sound-proof cap, Sound-proof cap, sound absorb designsound absorb design

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2 ． Study on Ieq limitation

Soil resistivity

Ieq limitation

200·m 3000 mA≤Ieq≤6000 mA

600m 2000 mA≤Ieq≤4000 mA

1000m 1500 mA≤Ieq≤3000 mA

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Electrode at the sending side was designed to be shared by two to three HVDC converter which is quite close to each other. Block of same polarity of 2 different HVDC links are considered. Max.allowable step voltage was carefully studied to optimize the electrode design.

３． Common electrode at the sending side

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The scheme of de-icing is to boost the current in the transmission line by altering the connection status between converter units through the ON/OFF status of related switches added in the DC switchyard.

4 ． De-icing configuration

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Conclusion：1.For a safe, economic UHVDC project, a series of innovative and optimized design different from conventional HVDC links have been applied in Xiangjiaba-Shanghai project which

is under construction.2.Those new features will be of good reference for future HVDC projects.

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Thank you