30621127-000-3bd-ee-01824 1_20 r-001
TRANSCRIPT
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11/21/11 J.H.Kim P.H.Kim
11/08/10 J.H.Kim P.H.Kim
DATE CHKD. CERT.
Project Title
Client
Consultant
in association with
Contractor
Document Title
REV.NO.
001
000
APPD.
D.J.Kim
D.J.Kim
DESCRIPTIONBY:
Issued for Approval (Revised as per discussion)J.H.Kim
J.H.Kim Issued for Approval
CONVERSION OF QURAYYAH OPEN CYCLE POWERPLANT TO COMBINED CYCLE POWER PLANT
PROJECT C
Functional Description and Logic Diagram for Block Load Control
DATE COMPLETED:
DOC. NO.
SAUDI ARABIA
DATE STARTED:
REV. NO.
THIS DOCUMENT IS NOT TO BE USED FORCONSTRUCTION OR FOR ORDERING
MATERIAL UNTIL CERTIFIED AND DATED
J.H.Kim
OPR'G. DEPT.:
CREATED BY: J.H.KimCHECKED BY:
ENG. DEPT.:
APPROVAL/CERTIFICATION INFORMATION
QURAYYAH
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Project : QURAYYAH CCPPSubject : Functional Description and Logic Diagram for Block Load ControlDoc. No. : 30621127-000-3BD-EE-01824
CONTENTS
1. General
2. Block Load Control (Station Load Control) Philosophy
3. Conceptual Operation Block Diagram
Appendix:
-. DCS Graphic for Block Load Control
-. Logic Diagrams for Block Load Control System
-. AGC Control Logic in Existing DCS
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Project : QURAYYAH CCPPSubject : Functional Description and Logic Diagram for Block Load ControlDoc. No. : 30621127-000-3BD-EE-01824
1. General
The Block Load Control will be implemented in the Qurayyah Combined Cycle Power
Plant DCS control system. It will co-ordinate the electrical loading of the Gas Turbine
Generators (GTGs) and Steam Turbine Generators (STGs) and will provide setpoints toGTG control systems to achieve Block (Station) MW Control.
2. Block Load Control (Station Load Control ) Philosophy
The block (individual power block) total power demand (target) will be selected by anoperator selectable setpoint or load demand from LDC (Load Dispatch Center) and is
calculated by the DCS, which adjusts the individual load setpoints for each of the
operational GTGs.
Control of the power output from the individual GTGs will also be possible from their local
control panels using a local setpoint. Selection of the point of control will be from the
respective local control panel (remote for DCS control). All the setpoints for local and
remote operation are contained within the GTG respective local control panels. The
transfer from local to remote control and vice versa shall be bumpless.
STG MW OUTPUT
STGs MW output will be controlled separately. They will operate either on a speed/load
control or IPC (Inlet Pressure Control) the load will vary with the process conditions.
Th f h DCS i l d ll ill l id h MW d i f h
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Project : QURAYYAH CCPPSubject : Functional Description and Logic Diagram for Block Load ControlDoc. No. : 30621127-000-3BD-EE-01824
Pre-select Load (Existing in Open Cycle) Station Load Control Base Load (Existing in Open Cycle)
When a GTG control panel is selected to remote operation, the DCS accepts the currentmode of operation which could be Pre-select load, Base load or Manual Raise/Lower.
Station Load Control mode is available only from the DCS. In this mode the DCS
determines the operational setpoint for each GTG based on an operator entered export
requirement. Whilst in any of the local panel modes of operation, the DCS Pre-select load
setpoint will track the GTG MW output.
The DCS receives status signals from the GTG for the current mode of operation and
whether the local control panel is in local or remote. The GTG local control panel is the
master for mode selection.
The DCS has the following analogue output to each GTG local control panel; Pre-select load
The Pre-select load signal to each GTG controller is used both for the Pre-select load and
the Station load control. For Pre-select load the operator selects the setpoint and for
Station load control the DCS determines the setpoint based on the station export
requirement. When neither of these modes are in use, the DCS tracks the GTG MW
output to ensure bumpless transfer on mode change.
Manual Speed/Load Control (Existing in Open Cycle)
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In Pre-select load mode the operator enters a setpoint for each GTG MW output. The
GTG local control panel must be set to remote before an operator can enter a setpoint.
Once the desired setpoint has been entered a confirmation will be required from the
operator before the setpoint is accepted. Only a valid setpoint will be accepted. If the
setpoint is not valid, or the conditions are not correct for the setpoint to be accepted then
the last value will be retained. The GTG local control panel uses the setpoint in a closedloop control system to maintain the desired output.
The limitation of maximum rate of GTG output increase or decrease is set within the GTG
local control panel. This prevents damage to the GTG due to the analogue either ramping
too fast or jumping.
Station load control
In Station load control mode, the operator sets a station Export MW output and the DCS
determines the Pre-select setpoint for each of the GTGs in this mode. The Export MW
value can also be set via grid control, but only if the operator has selected this mode of
operation. Station load control mode for a GTG can only be selected when the respective
local control panel is in remote and the circuit breaker is closed. A GTG has to be in
Station load control mode before an export setpoint can be entered. On selecting a GTG
to Station load control mode the current export MW will become the initial setpoint. If the
GTGs switched to this mode of operation are running at different MW outputs then the
setpoint to each will be adjusted by the DCS until the load is equally shared.
An operator will only be able to enter a valid export MW setpoint. This valid value could
be constantly changing depending on the number of GTGs in Station load control mode,
In house loading and the output of the units in other modes which are supplying load to
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Project : QURAYYAH CCPPSubject : Functional Description and Logic Diagram for Block Load ControlDoc. No. : 30621127-000-3BD-EE-01824
GTG in Droop mode APS ON is Not Initiated
The GTG will exit from Station load control under the following conditions: GTG not remote mode
GTG circuit breaker not closed GTG Station load control Pushbutton OFF Initiated GTG not in Droop mode APS ON is Initiated GTG not pre-select mode GTG base load GTG Load Runback Initiated
Base load (Existing in Open Cycle)
In Base load mode, a GTG is run at its maximum output. The GTG can be set to Base
Load either locally at the control panel, or if the control panel has been set to remote from
the DCS. The GTG is ramped to its maximum output with various parameters (i.e.
temperature) constantly monitored. In the event of the temperature rising above a pre-set
value the output is ramped back to a pre-set point. This mode is configured in the GTG
local control panel. The DCS sends a signal to the GTG local control panel to switch to
Base load and monitors the operation. The GTGs will remain in this mode of operation
until a new mode is selected for each GTG.
3. Conceptual Operation Block Diagram
Refer to next page;
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Project : QURAYYAH CCPPSubject : Functional Description and Logic Diagram for Block Load ControlDoc. No. : 30621127-000-3BD-EE-01824
Block Load Control is Highest Control Loop of APC
(Automatic Plant Control System) in Combined Cycle
Power Plant.
This Control Loop will decide Total Power Demand
and Station Export Power Demand as per Power
Plant Operation Condition or Power Demand fromLDC (Load Dispatch Center) and Control each
Turbine Generator Power.
What is Non STN (Station) Power ?
For GTG, Total MW in Operation Mode in PRESEL
(Fixed Load), not in Operation in Station Load Mode.For STG, Actual Power (MW) because this is always
Non STN Mode.
What is No of STN Mode ?
Number of GTG in Station Mode
What is In House Load ?
Power Consumption in the Qurayyah Power Plant
What is STG Load Control Concept?
STG Power Output will be Controlled under IPC (Inlet
Pressure Control) Mode (Like as Turbine Follow Mode
in Thermal Power Plant).
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Project : QURAYYAH CCPPSubject : Functional Description and Logic Diagram for Block Load ControlDoc. No. : 30621127-000-3BD-EE-01824
Index for Block Diagram
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Project : QURAYYAH CCPPSubject : Functional Description and Logic Diagram for Block Load ControlDoc. No. : 30621127-000-3BD-EE-01824
Appendix :
-. DCS Graphic for Block Load Control
-. Logic Diagrams for Block Load Control System
-. AGC Control Logic in Existing DCS
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Appendix-1- DCS Graphic for Block Load Control
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Appendix-2 - Logic Diagram for Block Control
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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
00 00
01 01
02 02
03 03
04 04
05 05
06 06
07 07
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10 10
11 11
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13 13
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29 29
7/28/2009 11:40:51 AMLast Modified
V01.00.00AModule Revision Customer
AGC IN will be processed only when PER1& PER2 are satisfied.PER1 & PER2 will be specified at site by customer.Title
ELECTRICAL.AGC_1Software Path
5/26/2009 18:35:53Build Major Revision
ELEC1Device Name Site DM Number Requisition
V03.03.27CToolboxST Version DWG Engineer
000 00:00:00Build Minor Revision
8/21/2009 10:13:32 AMPrint Date Process Application Serial Number Shop Order Number Machine Size Cont. on Sh.
0001Sh. No.
SELECTOR_3 19
SELASELB
CASC
INA1
INB1
OUT1
GRP A
GRP B
O UT
C ONT R OL
SELECTOR
CASC
NOT_4 20
AND_5 21
MOVE_4 22
ENABLE
OR_4 23
NOT_5 24
LATCH_2 25
S
R
LATCH_4 32
S
R
LATCH_5 36
S
R
P_B_4 38
P_B_5 39
P_B_6 40
P_B_7 41
P_B_8 42
P_B_9 43
NOT_10 46
Same conditions as discussedabove for other GT's.
Latching of Auto and Manualsignals.
B3.P13MYB75GH001XT13
G3_MANUAL_LATCHLATCH_5.OUT 0001
EGD
B3.P13MYB75GH001XZ61
AGC_INLATCH_1.OUT 0000
EGD
G1_MANUALEGD
G1_AUTOEGD
G2_MANUALEGD
G2_AUTOEGD
G3_MANUALEGD
G3_AUTOEGD
SELECTOR_3.OUT1AGC_BLOCK1.PV3 0000
AGC_TRK3AGC_BLOCK1.TK3 0000
G1_MANUAL_LATCHELECTRICAL.AGC1_4.OR_1.IN2ELECTRICAL.AGC1_4.NOT_3.A
AND_3.IN2 0000OR_2.IN2 0000NOT_8.A 0000
EGD
G2_MANUAL_LATCHELECTRICAL.AGC1_2.OR_1.IN2ELECTRICAL.AGC1_2.NOT_3.A
AND_4.IN2 0000OR_3.IN2 0000NOT_9.A 0000
EGD
G3_MANUAL_LATCHELECTRICAL.AGC1_3.OR_1.IN2
EGD
NOT_4.NOT_AAND_5.OUT
0
B3.P13MYB75GH001XZ61
MOVE_4.DEST
AGC_BLOCK1.PV3 0000
B3.P13MYB75GH001XT13
B3.P13MYB75GH001XT13G3_MANUAL_LATCH
B3.P13MYB75GH001XZ61NOT_10.NOT_A
GT3_STPTEGD ELECTRICAL.AGC1_3.SELECTOR_1.INB1
NOT_5.NOT_AG3_MANUAL_LATCH
NOT_4.NOT_AAGC_TRK3
AGC_BLOCK1.TK3 0000
AGC_IN
P_B_4.OUT
P_B_5.OUT
G1_MANUAL_LATCHEGD ELECTRICAL.AGC1_4.OR_1.IN2
P_B_6.OUT
P_B_7.OUT
G2_MANUAL_LATCHEGD ELECTRICAL.AGC1_2.OR_1.IN2
P_B_8.OUT
P_B_9.OUT
G3_MANUAL_LATCHEGD ELECTRICAL.AGC1_3.OR_1.IN2
G1_MANUAL
G1_AUTO
G2_MANUAL
G2_AUTO
G3_MANUAL
G3_AUTO
G3_MANUAL_LATCH
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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
AGC IN
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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
00 00
01 01
02 02
03 03
04 04
05 05
06 06
07 07
08 08
09 09
10 10
11 11
12 12
13 13
14 14
15 15
16 16
17 17
18 18
19 19
20 20
21 21
22 22
23 23
24 24
25 25
26 26
27 27
28 28
29 29
7/28/2009 11:40:51 AMLast Modified
V01.00.00AModule Revision Customer
Logic for Unit wise operation.Title
ELECTRICAL.AGC1_2Software Path
5/26/2009 18:35:53Build Major Revision
ELEC1Device Name Site DM Number Requisition
V03.03.27CToolboxST Version DWG Engineer
000 00:00:00Build Minor Revision
8/21/2009 10:14:04 AMPrint Date Process Application Serial Number Shop Order Number Machine Size Cont. on Sh.
0000Sh. No.
AND_1 3
SELECTOR_1 1
SELASELB
CASC
INA1
INB1
OUT1
GRP A
GRP B
O UT
C ONT R OL
SELECTOR
CASCOR_1 2
NOT_1 4
NOT_2 5
MOVE_1 6ENABLE
NOT_3 7
Logic for Unit wise operation.
Once unit wise control selected, AGC_Unit wisesetpoint will be processed for individual GT.If GTtaken into manual, operator can enter thesetpoint with bumpless transfer taken intoconsideration.If external load setpoint control DInot received from MarkVI, then MW feedbackfrom Mark VI will be processed.
Ref Screen : P12-MYA-01.cim
AGC_INELECTRICAL.AGC_1.LATCH_1.OUT
EGD
UNIT_SEL_1ELECTRICAL.AGC_1.NOT_7.NOT_A
EGD
G2_MANUAL_LATCHELECTRICAL.AGC_1.LATCH_4.OUT
EGD
B2.P12MYB75GH001XT13
AGC1.AGC_GT2
B2.P12MYB75GH001XZ61
AGC_INUNIT_SEL_1
NOT_3.NOT_AB2.P12MYB75GH001XT13
AND_1.OUTOR_1.OUT
SELECTOR_1.OUT1
AGC1.AGC_GT2
GT2_STPT
P12MYB75GH001YQ66_F1EGD ELECTRICAL.AGC_1.SELECTOR_5.INB1
NOT_1.NOT_AG2_MANUAL_LATCH
NOT_2.NOT_A
AGC_IN
B2.P12MYB75GH001XT13
B2.P12MYB75GH001XZ61NOT_3.NOT_A
GT2_STPTEGD ELECTRICAL.AGC_1.MOVE_3.DEST
G2_MANUAL_LATCH
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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
AGC IN
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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
00 00
01 01
02 02
03 03
04 04
05 05
06 06
07 07
08 08
09 09
10 10
11 11
12 12
13 13
14 14
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22 22
23 23
24 24
25 25
26 26
27 27
28 28
29 29
7/28/2009 11:40:51 AMLast Modified
V01.00.00AModule Revision Customer
Logic for Unit wise operation.Title
ELECTRICAL.AGC1_3Software Path
5/26/2009 18:35:53Build Major Revision
ELEC1Device Name Site DM Number Requisition
V03.03.27CToolboxST Version DWG Engineer
000 00:00:00Build Minor Revision
8/21/2009 10:14:28 AMPrint Date Process Application Serial Number Shop Order Number Machine Size Cont. on Sh.
0000Sh. No.
AND_1 3
SELECTOR_1 1
SELASELB
CASC
INA1
INB1
OUT1
GRP A
GRP B
O UT
C ONT R OL
SELECTOR
CASCOR_1 2
NOT_1 4
NOT_2 5
MOVE_1 6ENABLE
NOT_3 7
Logic for Unit wise operation.
Once unit wise control selected, AGC_Unit wisesetpoint will be processed for individual GT.If GTtaken into manual, operator can enter thesetpoint with bumpless transfer taken intoconsideration.If external load setpoint control DInot received from MarkVI, then MW feedbackfrom Mark VI will be processed.
Ref Screen : P13-MYA-01.cim
AGC_INELECTRICAL.AGC_1.LATCH_1.OUT
EGD
UNIT_SEL_1ELECTRICAL.AGC_1.NOT_7.NOT_A
EGD
G3_MANUAL_LATCHELECTRICAL.AGC_1.LATCH_5.OUT
EGD
B3.P13MYB75GH001XT13
AGC1.AGC_GT3
B3.P13MYB75GH001XZ61
AGC_INUNIT_SEL_1
NOT_3.NOT_AB3.P13MYB75GH001XT13
AND_1.OUTOR_1.OUT
SELECTOR_1.OUT1
AGC1.AGC_GT3
GT3_STPT
P13MYB75GH001YQ66_F1EGD ELECTRICAL.AGC_1.SELECTOR_6.INB1
NOT_1.NOT_AG3_MANUAL_LATCH
NOT_2.NOT_A
AGC_IN
B3.P13MYB75GH001XT13
B3.P13MYB75GH001XZ61NOT_3.NOT_A
GT3_STPTEGD ELECTRICAL.AGC_1.MOVE_4.DEST
G3_MANUAL_LATCH
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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
00 00AGC_INEGD
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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
00 00
01 01
02 02
03 03
04 04
05 05
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07 07
08 08
09 09
10 10
11 11
12 12
13 13
14 14
15 15
16 16
17 17
18 18
19 19
20 20
21 21
22 22
23 23
24 24
25 25
26 26
27 27
28 28
29 29
8/21/2009 4:44:52 AMLast Modified
V01.00.00AModule Revision Customer
Logic for Unit wise operation.Title
ELECTRICAL.AGC1_4Software Path
5/26/2009 18:35:53Build Major Revision
ELEC1Device Name Site DM Number Requisition
V03.03.27CToolboxST Version DWG Engineer
000 00:00:00Build Minor Revision
8/21/2009 10:15:05 AMPrint Date Process Application Serial Number Shop Order Number Machine Size Cont. on Sh.
0000Sh. No.
AND_1 3
SELECTOR_1 1
SELASELB
CASC
INA1
INB1
OUT1
GRP A
GRP B
O UT
C ONT R OL
SELECTOR
CASCOR_1 2
NOT_1 4
NOT_2 5
MOVE_1 6ENABLE
NOT_3 7
Logic for Unit wise operation.
Once unit wise control selected, AGC_Unit wisesetpoint will be processed for individual GT.If GTtaken into manual, operator can enter thesetpoint with bumpless transfer taken intoconsideration.If external load setpoint control DInot received from MarkVI, then MW feedbackfrom Mark VI will be processed.
Ref Screen : P11-MYA-01.cim
ELECTRICAL.AGC_1.LATCH_1.OUTEGD
UNIT_SEL_1ELECTRICAL.AGC_1.NOT_7.NOT_A
EGD
G1_MANUAL_LATCHELECTRICAL.AGC_1.LATCH_2.OUT
EGD
B1.P11MYB75GH001XT13
AGC1.AGC_GT1
B1.P11MYB75GH001XZ61
AGC_INUNIT_SEL_1
NOT_3.NOT_AB1.P11MYB75GH001XT13
AND_1.OUTOR_1.OUT
SELECTOR_1.OUT1
AGC1.AGC_GT1
GT1_STPT
P11MYB75GH001YQ66_F1EGD ELECTRICAL.AGC_1.SELECTOR_4.INB1
NOT_1.NOT_AG1_MANUAL_LATCH
NOT_2.NOT_A
AGC_IN
B1.P11MYB75GH001XT13
B1.P11MYB75GH001XZ61NOT_3.NOT_A
GT1_STPTEGD ELECTRICAL.AGC_1.MOVE_2.DEST
G1_MANUAL_LATCH
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