20240909IPC to Staff 95(e) - Attachment 4 - MLPR200001 Unit 1 Commissioning MLPR1 - Startup_PSS Tuning and VAR-501 Data Collection Guide_R0_.pdf

0IDAHo KmeR.
Milner Power Plant U1
Power System Stabilizer (PSS)
Commissioning Guide
Power Supply
Electrical Engineering
Initial Controller Settings and PSS Operational
Commissioning Procedures with VAR-501 Data
Collection Requirements.
February
© 2024 Idaho Power

Idaho Power Company PSS Commissioning Guide
Review/Revision History
This document has been approved and revised according to the revision history
recorded below.
Review Date Revisions
03/21/2023 Document Origination.
Table of Contents
Tableof Contents..............................................................................................................................i
1 Preparations................................................................................................................................. 1
1.1 PSS Logic Flow Chart Review............................................................................................... 1
1.2 Settings Group Review........................................................................................................ 2
2 Initial PSS DECS-400 Settings ....................................................................................................... 2
2.2 PSS....................................................................................................................................... 2
2.2.1 Configure.................................................................................................................... 2
2.2.2 Control (Primary) ....................................................................................................... 3
2.2.3 Control (Secondary)................................................................................................... 4
2.2.4 Parameters (Primary)................................................................................................. 5
2.2.5 Parameters (Secondary) ............................................................................................ 7
2.2.6 Output Limiter (Primary)............................................................................................ 7
2.2.7 Output Limiter (Secondary) ....................................................................................... 8
3 Commissioning........................................................................................................................... 10
3.1 Final Data Acquisition Summary....................................................................................... 10
3.1 Local Mode Oscillation...................................................................................................... 11
3.2 Develop Phase Compensated —Time Constants .............................................................. 12
3.3.3 Enable PSS and Control Group Verification............................................................. 17
3.3.3 Initial Step Responses and PSS Stability Gain Determination ................................. 18
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Idaho Power Company PSS Commissioning Guide
3.4 PSS Step Response Measurements................................................................................... 20
3.5 PSS OEL Response Measurement..................................................................................... 23
3.6 PSS UEL Response Measurement..................................................................................... 26
3.7 PSS Final -5% Stability Step Response............................................................................... 28
3.7.1 DECS400 Settings File............................................................................................... 28
3.8 Steady State Data Collections........................................................................................... 29
3.9 VAR-501 Evidence Submission.......................................................................................... 30
3.9.1 PSS Output Limits..................................................................................................... 30
3.9.2 PSS Washout Time Constants.................................................................................. 31
Review/Revision History.............................................................................................................i
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Idaho Power PSS Commissioning Guide
1 Preparations
1.1 PSS Logic Flow Chart Review
Review the Basler PSS logic for soft switch settings.
Mechanical
Frequen q ;eTq.,ncy Lc•;,-Pass t cc Power Ramp + CC 00EV
S p- 61P 4'J ashout Fitter—Wash out Fitter—� eye Fitter L Low-pass Track Fitter L —'
e ed 2
SSW o Finer
Pover
Input
Scalar
Po%w Poeer SSW 1
PE Washout Vash out Enabi. Integrator
electrical Filter Fiper2
power naa.
1 ca...
p.—d SSW 2 SSW 4 SSW 5
Scrod �� E-n. Torsional c"�` —ors�cnai
o.;..d _ Filter ti--t Fitter2
ri.al$md os.m i
r.y�mry SSW 3
Phase Phase SSW 6 o.s.n. SSW 7 VPSS
Compensation Compensation �•s
Stage 1 Stage 2
Phase Phase
Comperrs�ion Compensation—
Stage 3 Sege 4
V V .w.
+ a
Temtinal SSW 8
Voltage asb1e
VT Low-Pass Ramp Limiter •
Fitter
cnyd.
a
vox u. PSS
SSWSSW9 err10E.u. Output
Gain Stage —� Scale Facto �
N
Evtle• un M hi Odle•
VgiW.
_ Logic Limiter Logc Limiter
Washout Filter VJ asho ut F fitter roaao-n
n lvo.
i
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Idaho Power PSS Commissioning Guide
1.2 Settings Group Review
JQ
�<
O �0J� O J�
l7 ,� Q- ��
IT <� Q
co
v7
4-
.�
N Y�Q�
r g PSS ON
I_>I OEL Primary Group
I I UEL Primary Group
0 9.8MW 49.OMW
(0.20) (1.0)
1. ❑ Review the plant POG for any rough or forbidden areas.
Note: If the primary PSS and Secondary PSS do not switch correctly during commissioning, or
the primary does not seem to activate and seem stuck in secondary you must set the Setting
Group Logic to 1.0. This should then deactivate the secondary PSS and activate the primary.
This was discovered when commissioning Hells Canyon Unit 1.
2 Initial PSS DECS-400 Settings
2.2 PSS
2.2.1 Configure
Setting Comments
This unit has a Kaplan turbine and there is
Settings Group Logic Disable no rough region to use Secondary values.
Primary only. Will be verified during
commissioning.
Tf mo. =o secondary.
when Setting Group Logic is enabled.
Hysteresis 0.01 Default 0.01 when Setting Group Logic is
enabled.
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Idaho Power P55 Commissioning Guide
Rate of Change Disable
ThrE
Time Delay
Block
Low Pass Filter Tirr -
Wash Out Filter Time Constant
2.2.2 Control(Primary)
1. ❑ Disable the PSS Enable switch within the DECS Excitation Cabinet. (Will be enabled
later)
2. ❑ Verify a standing alarm is present on the plant GUI.
3. ❑ Verify dispatch and Transmission desk receive the PSS Disabled Alarm.
This is a compliance verification of VAR-501 the transmission desk receives the alarm.
Setting Comments
PSS Control Disable This will be enabled later.
Primary Supervisory Function
PSS active is typically set to 2090,
but some units have exceptions.
Power-On Threshold 0.20
** Report/Coordinate this value to
the TP per VAR-501 **
Power Hysteresis 0.05 Standard.
Primary Software Switch (SSW)
SSW 0—Speed Low Pass Filter Disable
SSW 1— Power Washout Filter#2 Disable
SSW 2— PSS Signal Der. Speed Standard, "Acceleration"
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Idaho Power PSS Commissioning Guide
SSW 3— PSS Signal Der.
Freq/Speed Standard
SSW 4—Torsional Filter 1 Disable This is used for long shafts, steam
SSW 5 —Torsional Filter 2 Disable This is used for long shafts, steam
SSW 6—3rd Lead/Lag Stage Include
SSW 7—4t" Lead/Lag Stage Include
SSW 8—Term. Voltage Limiter Enable Enable per VAR-501
SSW 9— Logic Limiter Enable Enable per VAR-501
SSW 10— PSS Output Disable This will be enabled later.
2.2.3 Control (Secondary)
Setting Comments
Primary Supervisory Function
Power-On Threshold 0.20 Use same as Primary.
Power Hysteresis 0.05 Use same as Primary
Primary Software Switch (SSW)
SSW 0—Speed Low Pass Filter Disable
SSW 1— Power Washout Filter#2 Disable
SSW 2— PSS Signal Der. Speed Standard, "Acceleration"
SSW 3— PSS Signal Der. Standard
Freq/Speed
SSW 4—Torsional Filter 1 Disable This is used for long shafts, steam
SSW 5 —Torsional Filter 2 Disable This is used for long shafts, steam
SSW 6—3rd Lead/Lag Stage Include
SSW 7—4t" Lead/Lag Stage Include
SSW 8—Tem. Voltage Limiter Enable VAR-501 Required
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Idaho Power PSS Commissioning Guide
SSW 9— Logic Limiter Enable VAR-501 Required
SSW 10— PSS Output Off This will be enabled later.
2.2.4 Parameters (Primary)
Setting Comments
Low-Pass/Ramp Tracking
-11—Time Consi
Low pass filter of speed signal.
Enabled by switch SSW 0.
Low pass filtering of the integrator
T12—Time Const. 10.0 of the power signal.
In this case 1/10=0.1Hz, thus below
0.1Hz is filtered out. Standard.
Low pass filter. Provides,
attenuation of torsional
T13 —Time Const. components appearing in the speed
input path.
Ramp tracking filter. This is the PT
Tr—Time Constant 0.50 time constant. A value of 0.50 is
standard.
N — Num Exp. 1 Part of the power washout filter 1.
M — Den Exp. 5
Part of the power washout filter 1
and 2.
High-Pass Filtering/Integration
TW1—Time Const. 10.0 Frequency washout filter 1.
Standard is 10, 0.1Hz filter.
TW2—Time Const. 10.0 Frequency washout filter 2.
Standard is 10, 0.1Hz filter.
High pass filter. Power Washout
TW3 —Time Const. 10.0 Filter 1.
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Idaho Power P55 Commissioning Guide
High pass filter. Power Washout
Filter 2.
TW4—Time Const. 10.0 Enabled by SSW 1, Standard is
disabled.
H — Inertia 2.64 Per manufacture literature.
Torsional Filters
Zeta Num 0.05 Enabled by SSW 4, Standard is
disabled.
Zeta Den 0.25 Enabled by SSW 4, Standard is
disabled.
Wn 1 42.5 Enabled by SSW 4, Standard is
disabled.
Enabled by SSW 5, Standard is
Zeta Num 2 0.05 disabled.
Enabled by SSW 5, Standard is
Zeta Den 2 O.z� disabled.
42.tJ�
Enabled by SSW 5, Standard is
disabled.
Rotor Freq. Calculation
Per manufactures literature. This
Quadrature Xq 0.57 can also be adjusted later if
needed.
Power Input
Kpe 1.0 Standard is 1.0. Power signal.
These values will be determined
from Frequency sweep
Phase Comp.—Time Constants compensation values, then
estimated for initial values
followed by testing.
T1- 1st Phase Lead 1.000
T2— 15t Phase Lag 1.000
T3—2nd Phase Lead 1.000
T4—2nd Phase Lag 1.000
T5—3rd Phase Lead 1.000 Enabled by SSW 6. Standard is to
include.
T6—3rd Phase Lag 1.000 Enabled by SSW 6. Standard is to
include.
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Idaho Power PSS Commissioning Guide
T7—41h Phase Lead 1.000 Enabled by SSW 7. Standard is to
include.
T8—41h Phase Lag 1.000 Enabled by SSW 7. Standard is to
include.
2.2.5 Parameters (Secondary)
These should be set to the same as the primary for this unit.
2.2.6 Output Limiter(Primary)
Setting Comments
PSS Output Limiting
Upper Limit 0.100 Must be <+5%per VAR-501.
Lower Limit -0.100 Must be>-5%per VAR-501.
Stabilizer Gain
This value is determined later.
Ks 1.00 Typically, 113 to 112 of ultimate
gain value (max Ks). See VAR-501.
Terminal Voltage Limiter
Low pass filter.
Time Constant 0.20 Enabled by SSW 8. Standard is
enabled.
Limit setpoint.
Setpoint 1.100 Enabled by SSW 8. Standard is
enabled.
Logic Limiter Washout Filter
Normal Time 10.0 Per VAR-501 must be less than 30.
Enabled by SSW 9.
Limit Time 0.30 Enabled by SSW 9.
Logic Output Limiter
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Idaho Power PSS Commissioning Guide
Upper Limit 0.020
Lower Limit -0.020
Time Delay 0.50
2.2.7 Output Limiter(Secondary)
Setting Comments
PSS Output Limiting
Upper Limit 0.100 Must be <+5%per VAR-501.
Lower Limit -0.100 Must be>-5%per VAR-501.
Stabilizer Gain
Use same as Primary, determine
Ks 1.0 final later.
Terminal Voltage Limiter
Low pass filter.
Time Constant 0.20 Enabled by SSW 8. Standard is
enabled.
Limit setpoint.
Setpoint 1.100 Enabled by SSW 8. Standard is
enabled.
Logic Limiter Washout Filter
Per VAR-501 must be less than 30.
Normal Time 10.0 Enabled by SSW 9.
Limit Time 0.30 Enabled by SSW 9.
Logic Output Limiter
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Idaho Power P55 Commissioning Guide
Upper Limit 0.020
Lower Limit -0.020
Time Delay 0.50
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Idaho Power PSS Commissioning Guide
3 Commissioning
This document is to provide guidance tuning the PSS, OEL, UEL and collecting VAR-501
compliance evidence. Portions of this testing evidence can be used for MOD-026 evidence/data
collection.
3.1 Final Data Acquisition Summary
Table 1.Summary of Data Acquisition
Step Time Step Pre-Trigger Sample
Section Test/Record Method' Magnitude' Delay' Duration' Points3 Interva13
PSS Steady State compensation Manual Trigger none O.Os O.Os 0 24.996ms
Ultimate Gain-Steady State Manual Trigger none O.Os O.Os 0 24.996ms
Online PSS Voltage Response
Time Response 2% 0.5s 9.Os 0 24.996ms
(Light Load)
Online PSS Voltage Response
Time Response -2% 0.5s 9.Os 0 24.996ms
(Light Load)
Online PSS Voltage Response
Time Response 2% 0.5s 9.Os 0 24.996ms
(Heavy Load)
Online PSS Voltage Response
Time Response -2% 0.5s 9.Os 0 24.996ms
(Heavy Load)
PSS OEL Limits-Control Time Response 2-5% 0.5s 30.Os 0 49.996ms
Response
PSS UEL Limits-Control Time Response 2-5% 0.5s 30.Os 0 49.996ms
Response
Online PSS Voltage Response
Time Response 2-5% 0.5s 30.Os 0 24.996ms
(Stability)'
Online Steady State Record
Manual Trigger none O.Os O.Os 0 49.996ms
(Multiple Loadings)
Note
1. Selected within the DECS-400 Analysis Time Response Menu.
2. Input switch 3 is the generator breaker closure input.
3. Selected within the DECS-400 Log Setup Menu.
4. Response method or DECS logic operator in Analysis menu
5. The initial MVar may need to be increased to avoid any OEL and UEL
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Idaho Power PSS Commissioning Guide
3.1 Local Mode Oscillation
1. Examine the power signal from the AVR step response above the rough zone in the
online step response.
2. The period of oscillation in the power signal will be the local mode oscillation for the
unit (Measure peak-to-peak oscillations):
1
F = —
T
Example:
F = (1/ 648ms) = 1.462Hz
If the the local mode oscillation is unknown a step response is required to determine
e the natural frequency. This frequency is required as to be avoided during the
Frequency Sweep In the next step. If the natural frequency Is close to values 0.1, 0.2,
0.5, 0.67, 0.77, 1.0, 1.25, 1.67, 2.0, 2.5, 3.33, 5.0, 10.0 the Frequency Sweep test will
need to be two parts; above and below the local mode to avoid exciting the natural
resonance of the machine.
3. The frequency sweep discussed in the next section may need to be broke into two
parts if the local mode oscillation is very close to a sweep value.
RTM Frequency Response
Mode Test Signal Location Frequency Response Automatic Options
Auto AVR Summing Magnitude(dB) Max Freq.(Hz) 1D.0
Transfer Function Phase(Degrees) Min Freq.(Hz 1.0
Exit 1.25
Input � Test Frequency
Magnitude 2.0
r Responnsse��y Output Bode Plot 2.5
3.33
5.0
j]- al;sr tFleal-Tmc F:lcnitcri 0.0
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Idaho Power PSS Commissioning Guide
3.2 Develop Phase Compensated —Time Constants
The unit is to be loaded above any rough zones at unity at the minimum possible loading for
stability. In some cases, units are loaded above 60%or up to 80%but that is not required. The
greater the loading the greater the risk of instability during the frequency sweep.
1. ❑ Disable the PSS of adjacent units. (if on the some bus)
2. ❑X if g r Rd �Srgains+�� TT��S ga d +., —he lead—.,.d
��--crs[�� `2 E" c cv ri s��cc,a cvuc�vcrcrca in
3. ❑ For an initial review the Min to Max frequencies can use the full range for use to
determine the compensated values.
a. The VAR-501 evidence should use a Min to Max range of 0.1-1.25Hz.
4. Using DECS400 Software
a. ❑ Select the Analysis Tab
R BESTCOMS-DECS400-[System Configuration] — ❑ X
- 7 Tnn17 Window, Hell,, _ 8 X
W Configure Settings Gain I limiters I Protection PSS
00�. a An,[;, Data Log Miler Logic
Product Identification I Rated Data I Options I Auxiliary Input I Meter Drivers I System Data I Transient Boost
"9,
PC Version
u
Unit Information
Basler Electric Model
Digital Exbtaon Control System Style
App Code
• DSP Code
BESTCBoot Code
Serial#
r Unit Style Number
DECS-000 Ic J More Info...
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Idaho Power PSS Commissioning Guide
b. ❑ Select Frequency Response
ig - — X
)� AAnalysis(Real-Time Monitor) ❑ X _ 9 x
m a '� �Graphltl(inlphtl Frequency Response Time Response Step Response
m
pf0p Start Clear Time in Graph 6.33aD� Scroll Graph�Maximize Graph Help Exit
Product GFaph1 2
Parameter��
I�ueuuruiJ 1 ......... ......... ......... ......... .........
Y-:.xis Max 2010
Y-Axis Min -2.000 0
Filter(Hz) 0.0
'.............:.............:............
Y Value 1 ............................
_2
0 100 200 300 400 500
Points(16.667ms between points)
GFaph2 2
Parame er
Vfd:Feld Vokage 1 .............
.............:.............:..........................
Y-Axis Max 2.000 0
Y-Aids Min _2.000
Filter(Hz) 0.0 a
.............:.............:.......................................:.
YValue
_2
0 100 200 300 400 Soo
Points(16.667ms between points)
ORTM Parameter 1
c. ❑ Frequency Response
• Check Plot Frequency Response
• Test Signal Location: AVR Summing
• Input: Test Signal {V}
• Output: Gen. Avg. Voltage {V}
• Max Freq (Hz): 5 or 10
• Min Freq (HZ): 0.1
• Magnitude: 1.0
RTM Frequency Response
Mode Lest Signal Location Frequency Response Automatic Options
Magnitude id6) F Max Freq.(Hz) 10.0 •
FAA, AVR Summing
Transfer Function Phase(Degrees) F Min Freq.(Hz) 0.1
bat Inputs
Test Frequency r
p Test Signal{V) . I - Magnitude 1.ON V
� Plot Frequency Bode Plot
Response Output I Gen.Avg.Voltage M
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Idaho Power P55 Commissioning Guide
eAn initial test of 0.1-5.OHz at O.SV can be ran to affirm stability prior to the
frequency response test for evidence.
AWhen performing the frequency sweeps be cautious and monitor the MW
value in the analysis screen. If the MW value starts to excessively oscillate
and increasing to instability you must switch to FCR in an attempt to
stabilize the oscillations.
d. ❑ At the completion of the test a plot should be displayed similar to below. May
need to prerss the "Bode Plot" button if it does not appear automatically.
Analysis(Bode Plot)
0.0
E -0 2
d
.._.............................
-04 ......... ........................... ............. 0900 T
-0-6 .................................................... ............ 0.300 T.
o -0 8 ...................................................... .. ........ 0.095 T
-1-0 .........................................................-12 0.017 T
10-1 100 101 0.095 T
Test Frequency(Hz) 0.017 T
0 0% T
0
a 0.017 T
b -100 :.......... Open
o -150 ...................................:......................... ........
a -200 ..................................: ........................... .... Plot Phw
m
a -250 Apply Pha
-300 Pi
10 t 100 1
Test Frequency(Hz)
Print Open Save Close
e. Using the MathCAD support sheet "IPCo PSS Compensation Calculation" develop
the initial phase compensation values and enter them into them into the Phase
Comp—Time Constants. Select "Plot Phase Compensation" to plot, then adjust
the values as needed to VAR-501 complience.
■ Must be less than 900 at 1.OHz and,
■ Less than 30' at O.2Hz.
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Idaho Power P55 Commissioning Guide
Analysis(Bode Plot)
1.2
0 0.8 .................................................................... 0.130 T1-1st Phase Leads)
0.6 ....................................................................... 0.013 T2-1st Phase Lags)
v 0.4 ....................................................................... 0.130 T3-2nd Phase Leads)
0.2 .......................................................................
0.013 T4-2nd Phase Lag(s)
0.0
100 101 1.000 T5-3rd Phase Lead(s)
Test Frequency(Hz) 1.000 T6-3rd Phase Lag(s)
1.000 T7-4th Phase Lead(s)
1.2
o .0 1.000 T8-4th Phase Lag(a)
1 .....................................
v0.8 ......................................................................... Open Save
0 0.6 .........................................................................
4 0.4 ......................................................................... Plot Phase Compensation
m
a 0.2 ......................................................................... Apply Phase Compensation
0.0 Parameters
10P 101
Test Frequency(Hz)
Print I Open save Close
The red line should be as tight as possible to the blue line between 0.5 and 1.25Hz
per VAR-501. As the frequency increases it will be tougher to align the curves,
expescially at 10Hz as it is normall curved back torwards 0°.
Analysis(Bode Plot)
40
30
...... 0.130 T
20 .................................:.................. . ............. 0.013 T.
10 ....................................... ....................... 0.130 T
Q
� o
10 0.013 T
10-1 100 101 1.000 T
Test Frequency(Hz) 1.000 T
1.000 T
0 1.000 T
d -50 ....................... ...........................
d -100 .............................. ... ..... Open
Cm -150 ............................................................... ..... PlotPha
a -200 ..................................:....................................
Apply Pha
-250 Pe
101 100 101
Test Frequency(Hz)
Print Open _ Sa:e ('lose I
Capture an image or Print a plot of this window, as this is the evidence to show
compliance. Also use the Save button to create *.gif files for the Bode magnitude and
phase plots, and a *.csv file for the raw uncompensated frequency response data.
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Idaho Power PSS Commissioning Guide
Check all options for the Save button pop-up, and use informative file names for future
record keeping. This will create two *.gif files for the Bode magnitude and phase plots,
and one *.csv file for the raw blue-line uncompensated frequency response data. Note
the raw frequency response data for the red-line PSS compensation is not saved, but it
can always be re-ploted at a later time.
Bode Plot Save Options
P Save Image of Magnitude Graph
r7o Save Image of Phase Graph
r%0 Save Graph Data to File
OK
❑ Apply the same values from the primary to the secondary phase compensated time
constants. (This is a precautionary step)
Time constants:
Initial MathCAD Values for Initial
Final Values
Values Step Test
T1
T2
T3
T4
T5
T6
T7
T8
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Idaho Power PSS Commissioning Guide
3.3.3 Enable PSS and Control Group Verification.
Enable the PSS control and verify the AVR control group operates as intended.
Online loaded AVR to PSS Transfer via physical switch within the AVR cabinet.
1. ❑ If the unit is at the existing loading from frequency sweep testing. Enable the soft
switches of the PSS.
Configure Control I Parameters I Output Limiter
Primary Secondary
" PSS Model Info...
r Enable 0_20 Power-0n Threshold
0.05 Power Hysteresis
Disable SSW 0-Speed Low Pass Filter Include SSW 6-3rd LeadiLag Stage
Disable . SSW 1-Power Washout Filter 92 Include SSW 7-4th Lea&Lag Stage
Der Speed . SS1,4-PSS Signal Enable SSW 8 Term.Voltage Limiter
Der.Freq.'Speed SSW 3-PSS Signal Enable SSW 9-Logic Limiter
Disable SSW 4-Torsional Filter 1 Join SSW 10 PSS Output
Disable SSW 5-Torsional Filter 2
2. ❑ At the excitation cabinet set the PSS switch to Enable.
Use communication from the AVR cabinet to the workstation. Before and
Aafter the switch is enabled watch the MW value from the DECS4O0 Analyses
menu. If MW oscillations become unstable, either disable from the manual
switch or the soft switch. If excessive oscillations continue switch to FCR
Mode.
3. ❑ Verify the PSS is active and using primary gains in the System Status menu within
the metering screen.
4. ❑ Verify the AVR gains are using Secondary gain group settings in the System
Status menu within the metering screen.
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Idaho Power PSS Commissioning Guide
3.3.31nitial Step Responses and PSS Stability Gain Determination
Perform an initial 2% step response to confirm stability with minimal PSS influence. This is
not recorded but observed before continuing onto determining the Stability Gain of the PSS.
(Refer to step response section for data logging settings)
1. Setup Data logger for step responses and ultimate stability gain records.
a. Go to Data Log-> Log Setup Menu
.. View seovace Of Evwft
I
rv— Data Logging Enabled
View!Download Data Log
Pre-Trigger Points
Pre-Trigger Duration isec) Download Trand Log
Post-Trigger Points
Post-Trigger Duration isec;
44 996 Sample Interval{ms;
Total Duration{sec;
b. Go to Data Log-> Log Selection Menu
MIN"T.M!11111111111111
Generator Average Voltage(pu`, Generator Real Power(pu)
or Pa ra meter 5
Field Voltage(pu) Generator Reactive Power ipu)
Field Cu-ent ;pu} PSS Final Output {pu)
2. Go to PSS-> Output Limiter Menu
a. Originally the Ks gain is set to 1.0. This provides minimal PSS influence.
b. Slowly increase the PSS Stabilizer Gain Ks until a frequency oscillation is observed
in the power output, or review to see noise appearing on the field voltage.
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Idaho Power PSS Commissioning Guide
m Crxfgure Settngs Gan Lirie• I Rotecton I PSS
n9 r Analysis Data Log Metz Logic
Configure Control Parameters Output Limiter I
Primary Secondary
0.100 Upper Limit 10.0 Normal Time
-0.100 Lower Limit 0.30 Limit Time
IF-, 0.020 Upper Limit
-0.020 Lower Limit
0.20 r•Time Constant 0.50 Time Delay
1.1-Do Setpoint
ePerform observational 2% voltage step responses intermittently as the gain is
increased to verify the MW and War signal for stability. This is typically
done in 3-5 value increments until the value is in the typical final range of 10-
15.
c. Continue to raise the Ks gain until the ultimate gain is achieved. This will typically
be around a Ks of 20 to 30.
eObserve the MW oscillations and field voltage. As the stability gain is
increased the MW oscillation may begin to appear. A noise will also start to
become present on the field voltage and increase as the stability gain is
raised, leading to rapid oscillations. (Reference past commissioning reports
and VAR-501 evidence for observed ultimate gain waveforms)
3. Ultimate Gain evidence record.
a. ❑ Manually trigger a steady state data log event at the Ultimate Gain, Ks-ultimate
b. ❑ Return the Ks gain to the final value (typically 1/3 to 1/2 of Ultimate Gain).
c. ❑ Manually trigger a steady state data log event with the final set Ks value.
eIf different Primary and Secondary groups are used in the PSS, both need to
be determined. This will need to be reviewed prior to tuning as rough or
forbidden zones may be present.
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Idaho Power PSS Commissioning Guide
3.4 PSS Step Response Measurements
A 2% step response is collected to compare to the AVR 2% step response to ensure the
stabilizer is performing. This will also be the data provided/used in the for modeling and MOD-
026 evidence. Compare the PSS step responses with the AVR step responses to ensure the MW
value is dampened and the field voltage displays the
1. Setup Data logger for step response.
a. Go to Data Log-> Log Setup Menu
Reference the table in the section above the
Data •• Setup View Sequence Of Events
PO Data Logging Enabled
View!Download Data Log
Pre-Trigger Pants
Pre-Trigger Duration(sec) Download Trod Log
Post-Trigger Points
Post-Tngger Duration fsec)
24 555 Sample Interval ims,
Total Duration;sec;
b. Go to Data Log-> Log Selection Menu
IN
Generator Average Voltage (pu) Generator Real Power fpu)
Field Voltage fpu) lGenerator Reactive Power fpu)
Field Current (pu) Time Response$w)
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Idaho Power PSS Commissioning Guide
2. Prepare the Analysis menu for a step response.
a. Select the Analysis button, this should bring up the menu.
• Set Graph 1 to display Vave
• Set Graph 2 to display KW
• Adjust the graph according to observe the step response, provide enough
room for the step values. Watch the KW for any instability.
10 BESTCOMS-DECS400-[Data Log]
1
)� File View Communications Tools Window Help = x
Cwtill Settings Gainer, P-otectlon PSS a link
re link Sl
7-1
J �p Malysis Data Log Meter Logic A
Log Setup I Mode Triggers Log Selection I Level Triggers I Logic Triggers I Trending I 6
J@ Analysis(Real-Time�� itor,l ❑
u Graphl Graph2 Frequency Response Time Response Step Response
r- lear Time in Graph 8.33s Scroll Graph Maximize Graph Help Exit
Graph 1
Parameter 1.04 ............:. . . .........,.:...,..,..,..
Vavg Avg N Vol
1 02
Y-Axis M 1.050
Y-Axis Mm 0.950 100 .............:..........................:............
Filter(Hz)
Y Value 0
0-96 ................. ............
0 100 200 300 400 500
Points(16.667ms between points)
8 Graph 2 1.0
Parameter 0.9
KWReal Power 0.8 ...................................................... ............
Y•Axis Max 1.000 0.7 ...........................:.............:.............:............
0.6 .............:.............:.............:.............:.............
Y-Axis Min 0,200 0.5
Filter(Hz) 0-0 0 4
.....................
Y Value F—0 0 3
0-2
0 100 200 300 400 500
Points(16.667ms between points)
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Idaho Power PSS Commissioning Guide
b. Perform the step response.
Refer to the table above for the step magnitude, duration, and Time Delay.
Test Signal
Time Delay Signal Input Stabilizer Test Signal So:eep Sigral Frequency Settirgs
0.5 r/ AVR Summing Step Sweep Type Start Frequency
r PSS Comp Frequency Magnitude Offset tilt( )
r PSS Electric Power (��)
Start r PSS Derived Speed 2 0 0.000 SI
Frequency Step Stop Frequercy
r Manual Summing Frequency(Hz) Duration(sxx) 1000 10.G- k
r VARIPF 0.000 9.0
Analysis(Real-Time Monitor) 0 X
(� 0 u IGraphlIlGraph2l Frequency Re.:_;._r Time Response Step Response
Start Clear Time in Graph 8.33a Scroll Graph Maximize Graph Help Exit
Granh 1
c. Exit the Test Signal Menu and Save the Step Response
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Idaho Power PSS Commissioning Guide
3.5 PSS OEL Response Measurement
This portion is to verify the OEL control gains and the PSS gains. The OEL values will be lowered
and a step response into the OEL should record each level at the respective times for
engagement.
OEL test reference in Basler manual pg. 146
---------------------------------------------
z ----
w
Ir Mgr
Ix ---------- T arwr
Lee
J �
AIedIIe O.D-344U;
ouffm ever
Lw—L N11e 't71�[ OONT1NlOUl" CLURAent C O-20 AW
0_10eec 0-12 wac Le.e
O.0-15 AW
TIME IN SECONDS
Figure 3-10. summing Point,On-Line Overexcitation Limiting
Figure 1. Basler IL DECS-400.
1. Load the machine above any rough areas at unity.
2. Go to the metering screen.
a. Note the machine values prior to start
Ifield
Weld
Vgen
MW
War
3. Go to Limiters -> Configuration.
a. ❑ Check OEL Enable or verify enabled.
b. ❑ Verify in the metering menu the Primary OEL is active.
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Idaho Power PSS Commissioning Guide
4. ❑ Record Original On-Line Values
High Level
High Time
Medium Level
Medium Time
Low Level
5. Go to Limiters -> Summing Point OEL
a. ❑ Lower the levels to slightly above the current value. Verify using the capability
curve the boundaries of the capability curve are not exceeded.
Test Values
High Level
High Time
Medium Level
Medium Time
Low Level
6. Go to -> Settings->AVR/FCR/FVR
a. ❑ It may be preferred to adjust the setpoint into the OEL to ensure stability as
an initial check prior to a 5% step response into the OEL limiter.
7. Go to -> Data Log-> Log Selection
a. ❑ Adjust the log selection.
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Idaho Power PSS Commissioning Guide
Generator Average Voltage(pu) OEL Controller Output{pu)
Feld Vokage(pu) Control Output
Field Current(pu) PSS Final Output(pu)
8. Go to the Analysis menu.
a. ❑ Perform a 5% step response into the OEL, so it is above the medium level tes
setting. Adjust the loading according.
b. ❑ Save the response.
9. If the response is unsatisfactory the OEL gains may need adjusted and rested in AVR
mode, then tried again with the PSS active.
10. ❑ Return OEL Limiter Values to their Initial settings values.
Example Response of the field current. Should be able to see the initial response, and the
timed control reactions 5 seconds apart. (example includes too much preposition samples)
Ifd
345
335
325
315
305
295
2S5
u
275
265
255
245
0 5 10 15 20 25 30
Time(s)
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Idaho Power PSS Commissioning Guide
3.6 PSS UEL Response Measurement
1. The unit should initially be operating at unity.
2. Go to Limiters -> Configuration
a. ❑ Uncheck UEL Enable
b. ❑ Record Existing Values
Real Power (kW) Reactive Power (WAR)
3. Go to Limiters -> UEL
a. ❑ Change reactive power limit value to about-3-5% Wars on the machine.
Test Values
Real Power (kW) Reactive Power (WAR)
4. Go to -> Settings->AVR/FCR/FVR
a. ❑ Increase the voltage setpoint until about +10% of Wars on the machine.
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Idaho Power PSS Commissioning Guide
5. Go to Limiters -> Configuration
a. ❑ Check UEL Enable
6. Go to Data Log-> Log Selection
Field '.'ohage ,u" W I UEL Controller Output{pu} •
Field Current pu • Contra l Output
Generator Reactive Pon,er ypu' FSS Final ,pu_
7. Go to the Analysis menu.
a. ❑ Perform a -5% step response into the UEL.
b. ❑ Save the response.
8. If the response is unsatisfactory the UEL gains may need adjusted and rested in AVR
mode, then tried again with the PSS active.
9. ❑ Return UEL Limiter Values to their Initial settings values.
Example Response
Kvar
Soo
500
N -1500
3
0
N -2500 0 5 15 20 25 30
y -3500
4500
5500
Time(s)
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Idaho Power PSS Commissioning Guide
3.7 PSS Final -5% Stability Step Response
A final stability step response is performed once all settings are in place and to ensure stability.
The capability curve will need to be reviewed prior to the response.
• No limit should be crossed, and the response should be stable.
1. ❑ Adjust the MW loading above any rough zone and below peak loading to avoid the
OEL and UEL, maintain within the capability of the machine.
2. ❑ Adjust the unit into positive MVar loading.
3. ❑ Perform a -5% step response as noted in the PSS Step Response Measurement
Section.
4. ❑ Save the measurement.
3.7.1 DECS400 Settings File
• ❑ Save the final DECS400 controller settings to the server and SharePoint.
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Idaho Power PSS Commissioning Guide
3.8 Steady State Data Collections
This is an online steady state record to collect normal operation for future comparisons of the
AVR and PSS output signals. Preferably at rated loading. This could be collected during MOD-
025 testing to collect the measurements.
The log selection parameters for the data collection should be as such:
..... ...................
IN BESTCOMS-DECS400-[Data Log] ❑ X
n File View Communications Tools window Help _ a' x
Ca�gue Settings Gain Limas Protection PSS
r»
m F
Lp Analysis 1 Data Log I Miler I Logic
Log Setup I Mode Triggers Log Selection I Lee[Triggers I Logic Triggers I Trending
Generator Average Vokage(pu) Generator Real Power(pu)
Fiead Vokage(pu) Contr l Output
Field Current(pu) PSS Final Output(pu)
8
If possible, collect the following loading points:
• ❑ Low Loading at Unity.
• ❑ Under-excited at low loading.
• ❑ Over-excited at low loading.
• ❑ Under-excited at heavy loading
• ❑ Overexcited at heavy loading.
• ❑ Heavy Loading at Unity.
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Idaho Power P55 Commissioning Guide
3.9 VAR-501, PRC-019 Evidence Submission
The data recorded must meet compliance standards for VAR-501 in accordance with
Requirement 3. In the event the collected data does not meet the standard leadership and
the VAR-501 custodian will be notified, future re-tuning of the PSS may be required.
Server location for evidence collected during testing;
\\Fresno\PowerProduction\NERC_Compliance_Standards\VAR-Voltage and Reactive\VAR-
501-WECC-3.1 Evidence\R3
Provide the VAR-501 custodian the follow items for evidence retention.
1. ❑ Final DECs Controller Settings File.
2. ❑ PSS Output Limits
3. ❑ PSS Washout Time Constants
4. ❑ Compensated Time Constants (Bode Plots with Blue and Red Lines)
Provide the PRC-019 custodian the follow items for evidence retention.
1. ❑ Final DECs Controller Settings File.
3.9.1 PSS Output Limits
A copy of the DECS Settings file will provide this data to the VAR-501 Compliance Custodian.
The PSS Output limits shall provide at least±5% of the nominal terminal voltage.
9 BESlCOMS-DEC5400-[PSS(Power System Stabilizer)] — ❑ X
]@ File View Communications Tools Window Help _ d+ x
_dr Configure Settings Gain linters Protection PSS
*-*j Malysis Data Log Meter Logic
Configure I Control I Parameters Output Limiter
Primary Secondary
•
DA00 Upper Limit 10.0 Normal Time
p.ppp Lower Limit F p.30 Limit Time
•
0.00 Ks F 0.020 Lipper Limt
520 Lower Lind
pp r,Time Constant o.50 Time Delay
71.ppp Setpoiat
B
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Idaho Power P55 Commissioning Guide
3.9.2 PSS Washout Time Constants
A copy of the DECS Settings file will provide this data to the VAR-501 Compliance Custodian.
PSS washout time constant shall be no greater than 30 seconds. SSW 9 must be enabled for
this setting to be implemented.
3 BESTCOMS-DECS400-[PSS(Power System Stabilizer)) — ❑ X
ig File View Communications Tools Window Help _ d' x
m Configure Settings Gan Loiters Protection PSS
to j& An*= Data log I Meta Logic
Configure I Control I Parameters Output Limiter
Primary Secondary
•
O.ODD Upper Limit tO,D Normal Time
O.ODD Lower Limit 0.3D Limit Time
0.00 Ks 0.020 Upper Limit
- - -0.020 Lower Limit
1.00
r Time Constant 0.0 Time Delay
1.gp0 Setpoird
8
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Idaho Power P55 Commissioning Guide
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