Technical criteria for wind farm power stations connected to the transmission system - Wind Power Integration: Connection and System Operational Aspects - page 273

specified under CC .5.4. There are three control modes required to
control Reactive Power generation of the WFPS :

(i) Voltage Control mode

(ii) Power Factor control mode

(iii) Reactive Power Dispatch

The technical requirements to control voltage differ between
WFPSs Connected to the 132 kV and higher voltage Systems
and WFPSs Connected to the 33 kV System.

(a) For WFPSs Connected to the 132 kV and higher voltage

Systems:

(i) Whilst the WFPS is operating in Voltage Control

mode the minimum reactive capability is defined by
the envelope ABCD in the Voltage Control char-
acteristic shown in CC.S2.3.2 Figure 1.

(ii) Whilst the WFPS is operating in control mode the

reactive capability is defined by the envelope AEB in
the Power Factor control mode characteristic shown
below.

(iii) Whilst the WFPS is operating in Reactive Power

Dispatch control mode, the WFPS , as a minimum,
must be capable of exporting or importing MVAr
within the envelope ABCD.

Minimum Reactive Capability Characteristic of WFPS at the Connection Point

1.1

A B

1

Connected at
132 kV and above

0.9

0.8

0.7

0.6

0.5

Voltage Control Mode/
Reactive Power Dispatch
Mode
Power Factor Control
Mode

0.4

0.3

0.2

0.1

C
-0.33
Consumption (lead) Mvar Capability
of the WFPS at the Connection Point

D

0

0.33
Production (lag) Mvar Capability of
the WFPS at the Connection Point

E

Q/P max

CC.S2.3.2 Figure 1 Minimum reactive Capability of Wind Farm Power Stations

Connected to the Transmission System at 132 kV and above
when operating in various modes