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Torino, 6 July 2010 – ESOF2010 1 What role does High Voltage Direct Current play and what HVDC backbones or supergrids does Europe need? Gianluca Fulli European Commission Joint Research Centre Institute for Energy

What role does High Voltage Direct Current play and what HVDC

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Page 1: What role does High Voltage Direct Current play and what HVDC

Torino, 6 July 2010 – ESOF2010 1

What role does High Voltage Direct Current play and what HVDC backbones or supergrids does Europe need?

Gianluca Fulli

European CommissionJoint Research CentreInstitute for Energy

Page 2: What role does High Voltage Direct Current play and what HVDC

Torino, 6 July 2010 – ESOF2010 2

• The European transmission grid

• HVDC features and challenges

• Developments of offshore/Mediterranean grids

• A vision for a European super grid

• Conclusions

Outline

Page 3: What role does High Voltage Direct Current play and what HVDC

Torino, 6 July 2010 – ESOF2010 3

Distribution (smart)

Transmission (super-smarter)

Power system evolution

TRANSMISSION(EXTRA HIGH VOLTAGE GRID)

HIGH-MEDIUM VOLTAGEDISTRIBUTION

LOW VOLTAGEDISTRIBUTION

GENERATION SYSTEM

TRANSMISSION SYSTEM

DISTRIBUTION SYSTEM

UTILISATION SYSTEM

SUBTRANSMISSION(HIGH VOLTAGE GRID)

Page 4: What role does High Voltage Direct Current play and what HVDC

Torino, 6 July 2010 – ESOF2010 4

• Power grids traditionally based on HVAC – High Voltage

Alternating Current technologies

• HVDC already used

– to link systems with different frequencies (asynchronous) and

– for very long lines and underground/submarine cables

• New HVDC concepts add on flexibility, responsiveness and

controllability over traditional HVDC

– also for multi-terminal applications needed for offshore wind

HVDC – recent trends

Page 5: What role does High Voltage Direct Current play and what HVDC

Torino, 6 July 2010 – ESOF2010 5

The breakdown distance depends on link length, voltage and power rating

HVDC vs. HVAC

HVAC

HVDC

Page 6: What role does High Voltage Direct Current play and what HVDC

Torino, 6 July 2010 – ESOF2010 6

• Investment costs for HVDC may be sizeable

• HVDC displacing HVAC can reduce environmental/visual impact

• HVDC can act as a ‘firewall’ immunising the AC grid from wide

area problems/disruptions

• Open questions for research & demonstration:

– Meshed (i.e. multiterminal) HVDC lines

– Interoperability of HVDC into AC grids

– HVDC superconductors

HVDC features and challenges

Page 7: What role does High Voltage Direct Current play and what HVDC

Torino, 6 July 2010 – ESOF2010 7

From present European transmission grid to...

(Source: ENTSO-E)

Page 8: What role does High Voltage Direct Current play and what HVDC

Torino, 6 July 2010 – ESOF2010 8

2030 vision of EWEA (Wind association)

Mid-long term vision of ENTSOE

HVDC for offshore grids

Page 9: What role does High Voltage Direct Current play and what HVDC

Torino, 6 July 2010 – ESOF2010 9

Crucial challenge for DC meshed grids: DC breaker and new technology developments

(Source: OffshoreGrid project)

Grid developments: North Sea

Page 10: What role does High Voltage Direct Current play and what HVDC

Torino, 6 July 2010 – ESOF2010 10

Mediterranean ring

(Source: Medring update study)

Page 11: What role does High Voltage Direct Current play and what HVDC

Torino, 6 July 2010 – ESOF2010 11

Technical, economic and political issues for this long-term project

(Source: Desertec)

DESERTEC

Page 12: What role does High Voltage Direct Current play and what HVDC

Torino, 6 July 2010 – ESOF2010 12

Long-term combination of offshore (HVDC/HVAC) grids, enlarged HVAC continental network, DESERTEC and MedRing as parts of the European transmission grid

European Super Grid vision

(Source: ENTSO-E)

Page 13: What role does High Voltage Direct Current play and what HVDC

Torino, 6 July 2010 – ESOF2010 13

• HVDC favourite option for long-distance power transmission and

for connection of offshore large-sized renewable plants

• Significant investment and technological demonstration needed

for reinforced transmission highways leading to a super grid

• Coordination of HVDC planning and operation necessary, as well

as an appropriate legislative and regulatory framework

Conclusions

Page 14: What role does High Voltage Direct Current play and what HVDC

Torino, 6 July 2010 – ESOF2010 14

What role does High Voltage Direct Current play and what HVDC backbones or supergrids doesEurope need?

[email protected]

European CommissionJoint Research CentreInstitute for Energy