Grid connection characteristics

Vattenfall Vesterhav Projects

31-10-18, Kenneth Skaug System Design, Vattenfall WindFarm Design

31/10/2018

Confidentiality – None (C1) 1

Agenda

1. Vesterhav site conditions

2. Grid connection at 150 kV Transmission

3. Grid connection definition

4. Grid code – V/Q example

5. Wind power plant characteristic

6. Voltage control scheme

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Concession areas:Danish nearshore projects

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Vesterhav South (VS)

Vesterhav North (VN)

Vesterhav north site conditions

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Vesterhav south site conditions

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Grid connection at 150 kV transmission

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Confidentiality – Critical (C4), High (C3), Medium (C2), None (C1) 6

Grid connection

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Vesterhav North

Rating 180 MW

WTG 21 x SG8.4-167

Grid connection 150 kV Engbjerg (ENG)

SCR 12-25 (2021)

Vesterhav South

Rating 170 MW

WTG 20 x SG 8.4-167

Grid connection 150 kV Søndervig (SVG)

SCR 10-20 (2021)

Principal grid layout

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Onshore

cable

150 kV

66 kV

150 kV cable

150 kV

Onshore

cable

Offshore

cable

Offshore

cable

Offshore cable Onshore cable Onshore substation Onshore transmission

Grid connection defintion

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Onshore

cable

150 kV

66 kV

150 kV cable

150 kV

Onshore

cable

Offshore

cable

Offshore

cable

POC PCC

POC: The point in the public electricity supply grid where the wind power plant is or can be connected

PCC: The point in the public electricity supply grid where consumers are or can be connected

60 kV

Voltage reference point

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Onshore

cable

150 kV

66 kV

150 kV cable

150 kV

Onshore

cable

Offshore

cable

Offshore

cable

POC PCC

The voltage reference point is either in the Point of Connection (POC), the Point

of Common Coupling (PCC) or a point in between.

Voltage

reference

Grid code requirementV/Q example

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Example: V/Q requirement

Energinet TF3.2.5 rev 4. 22.07.2016

V [pu]

Q [pu]

Grid code requirement

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V [pu]

Q [pu]

Data Value

Sn 160 MVA

Uk 12 %

V – HV 150 kV

V – LV 60 kV

POC

150 kV66 kV

P = 1.0 pu

Q={-0.33 – 0.33} pu

V=[0.9 -1.06] pu

V/Q requirement – POC 66 kV

POC

150 kV66 kV

P = 1.0 pu

Q={-0.33 – 0.33} pu

V=[0.9 -1.06] pu

Grid code requirement

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V [pu]

Q [pu]

Data Value

Sn 160 MVA

Uk 12 %

V – HV 150 kV

V – LV 60 kV

PCC

Effective 150 kV V/Q characteristic

POC

150 kV66 kV

P = 1.0 pu

Q={-0.33 – 0.33} pu

V=[0.9 -1.06] pu

Grid code requirement

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V [pu]

Q [pu]

Data Value

Sn 160 MVA

Uk 12 %

V – HV 150 kV

V – LV 60 kV

PCC

Limit on the voltage range ±10% PCC

Grid code requirement

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V [pu]

Q [pu]

Operating the tap changer

V [pu]

Q [pu]

90,0060,0030,000,00-30,00-60,00 [Mvar]

1,08

1,04

1,00

0,96

0,92

0,88

[p.u.]

Pow er Plant VQ Diagram (EN): Q = 0 in Mvar / Voltage at PCC in p.u.

Pow er Plant VQ Diagram (EN): Reactive pow er reference (at Pn) in Mvar / Voltage at PCC in p.u.

Pow er Plant VQ Diagram (EN): Reactive pow er at PCC in Mvar / Voltage at PCC in p.u.

V-Q Diagram

Date: 3/28/2017

Annex: /2

DIg

SIL

EN

T

Wind power plant characteristicPOC performance

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90,0060,0030,000,00-30,00-60,00 [Mvar]

1,08

1,04

1,00

0,96

0,92

0,88

[p.u.]

Pow er Plant VQ Diagram (EN): Q = 0 in Mvar / Voltage at PCC in p.u.

Pow er Plant VQ Diagram (EN): Reactive pow er reference (at Pn) in Mvar / Voltage at PCC in p.u.

Pow er Plant VQ Diagram (EN): Reactive pow er at PCC in Mvar / Voltage at PCC in p.u.

V-Q Diagram

Date: 3/28/2017

Annex: /2

DIg

SIL

EN

T

Wind power plant characteristicPOC performance

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3

1

1

2

2

1. Performance limit

2. Extra capacity

3. Rated voltage

Wind power plant characteristicPCC performance

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60,0040,0020,000,00-20,00-40,00 [Mvar]

1,08

1,04

1,00

0,96

0,92

0,88

[p.u.]

Pow er Plant VQ Diagram (EN): Q = 0 in Mvar / Voltage at PCC in p.u.

Pow er Plant VQ Diagram (EN): Reactive pow er reference (at Pn) in Mvar / Voltage at PCC in p.u.

Pow er Plant VQ Diagram (EN): Reactive pow er at PCC in Mvar / Voltage at PCC in p.u.

V-Q Diagram

Date: 3/16/2017

Annex: /2

DIg

SIL

EN

T

• Combining the tap changer

operation with voltage

control on the 150 kV side.

• Utilises the Wind power

plant capacity for grid

support

• Optimum operation of the

wind power plant

150 kV66 kV

V=[0.9 -1.06] puQ={-0.33 – 0.33} pu

Principal voltage control scheme

150 kV

66 kV

WFC

AVR

AVR

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Voltage control in remote area

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