Operating State 29

Mark,

The operating state codes 2 to 6 represent manual pitch overide.
The user can issue these pitch overides from the "Control blade angle" screen
as shown in Figure-1.

The operating state code 13 represent manual speed overide.
The user can issue this speed overide from the "Control speed" screen as
shown in Figure-2.

Note that if both manual speed control and manual pitch control are issued at
the same time
then the manual pitch control status is only shown for the operating state.

Figure-1

Figure-2

Operating State (Channel 29)

Value Description

0: Spare
1: Spare
2: Blade angle setpoint (all blades)
3: Blade angle plus
4: Blade angle minus
5: Blade angle stop
6: Blade angle setpoint (single blades)
7: Spare
8: Spare
9: Spare
10: Spare
11: Feathering position
12: Idle position
13: Manual speed setting
14: Run up
15: Idle position
16: Load operation
17: Manual torque setting
18: Shut down (speed)
19: Shut down load
20: Grid disconnection

Note: Operating state gets averaged in the 10-min data (Minana.db),
and will not be accurate if the turbine changes state during the
10-minute period.

---------------------- Forwarded by Joe Chapman/EWC/Enron on 06/27/2002 09:56
AM ---------------------------

Mark V Walker
06/27/2002 08:45 AM
To: Joe Chapman/EWC/Enron@Enron, Garth Ripton/EWC/Enron@Enron
cc: Mark Fisher/EWC/Enron@Enron

Subject: Operating State 29

Joe Chapman sent us an email listing a short textual description associated
with each value of Operating State 29. Some are easy to interpret (ex. 11 is
"Feathering position") because they are a visible element on the state
transition diagram in the controller document supplied by Garth. Others
aren't easy to interpret. Where should we look to understand the triggering
criteria for text strings associated with Operating states 0-6 and 13. We
are willing to do the work of reading the documentation if you can tell us
what to read. These values are labeled "Blade angle setpoint (all blades)",
" Blade angle plus", "Blade angle minus", "Blade angle stop", " Blade angle
setpoint (single blades)", and "Manual speed setting". I assume from these
names and the fact that they are not common in the SCADA data that all but
Blade angle stop are solely used for controller parameter changes or software
changes. We want to use Operating State 29 in our Statistical Process
Control and reporting logic but the lack of understanding on these parameter
values holds us back.