Modeling and closed Modeling and closed - - loop validation loop validation of a new PSS concept, the Multi of a new PSS concept, the Multi - - Band PSS Band PSS An ABB An ABB - - Hydro Hydro - - Québec joint Québec joint development development R. Grondin, I. R. Grondin, I. Kamwa Kamwa , G. , G. Trudel Trudel , L. , L. - - G. G. Lajoie Lajoie - - Hydro Hydro - - Québec Québec and and J. J. Taborda Taborda - - ABB ABB
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Grondin Slides Modeling and Closed-Loop Validation of PSS4B
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Modeling and closedModeling and closed--loop validation loop validation of a new PSS concept, the Multiof a new PSS concept, the Multi--
Band PSSBand PSS
An ABB An ABB -- HydroHydro--Québec joint Québec joint development development
R. Grondin, I. R. Grondin, I. KamwaKamwa, G. , G. TrudelTrudel, L., L.--G. G. Lajoie Lajoie -- HydroHydro--QuébecQuébec
and and J. J. Taborda Taborda -- ABBABB
PlanPlan
Context
MB-PSS concept
Model : IEEE PSS4B
Results based on simulations : Hydro-Québec system
Close loop tests in the field : LG2 power plant
Conclusions
ContextContextDeregulated power systems :
Power flows are increased (stressed systems)New interconnexions and new modes of oscillationStability margins are reduced
Subject to multiple modes of oscillations :Local modes : - plants (0.8 to 2.0 Hz)
- Intermachines (1.5 Hz to 4.0 Hz )Interarea modes : (0.2 to 1.0 Hz)Global (common) mode : < 0.2 Hz (Hydro-Québec system is 0.05 Hz)is 0.05 Hz)
ConceptProblem :Provide an efficient mean to damp multi-modal oscillations for a frequency range approaching 2 decades (0,04 Hz to 4 Hz)
Concept :Divide the problem in multiple frequency bandsProvide appropriate compensation for each of these bands
DampingDamping performances : MIMO modelperformances : MIMO model
Dominant modes No PSS
Hz ζ1] Global 0.063 0.24
2] Inter – area 1 0.69 0.023
3] Inter – area 2 1.025 0.076
4] Local 49 1.439 0.055
5] Local 59 1.437 0.036
6] Inter – machine 49 - 449 1.484 0.246
7] Inter – machine 59 – 159 1.604 0.121
Hz 0.059
0.58
0.91
2.21
2.16
2.36
2.47
Hz 0.07
0.58
0.93
1.29
1.33
4.2
4.0
ζ0.22
0.14
0.30
0.26
0.34
0.14
0.09
ζ0.35
0.24
0.28
0.4
0.4
0.31
0.37
Current PSS (at both sites) MB-PSS (at both sites)
Frequency domain Frequency domain impulse impulse response at response at LG2LG2
10−1
100
101
0.005
0.01
0.015
0.02
0.025
0.03
0.035
pu
/pu
(a) Speed(449): Gain Response to Voltage Excitation at LG2(49)
10−1
100
101
1
2
3
4
5
6
7
Hz
pu
/pu
(b) Pacc(449): Gain Response to Voltage Excitation at LG2(449)
PSS4B(Normal Gain)PSS4B(High Gain)Existing PSS
Step responses at Step responses at LG2 : LG2 : field and field and simulationsimulation
0.5 1 1.5 2 2.5
−10
0
10
MW
De
via
tio
n
+50MVARS STEP
0.5 1 1.5 2 2.5
−2
−1
0
PS
S S
ign
al(%
)
PSS4B−Normal Gain (Test #7d16)PSS4B−High Gain(Test #17d16)Existing PSS (Test #5d16)
0.5 1 1.5 2 2.5
−0.04
−0.02
0
0.02
Sp
ee
d D
evia
tio
n(H
z)
Time in seconds
0.5 1 1.5 2 2.5
−10
0
10
MW
De
via
tio
n
0.5 1 1.5 2 2.5
−2
−1
0
PS
S S
ign
al(%
)0.5 1 1.5 2 2.5
−0.04
−0.02
0
0.02
Sp
ee
d D
evia
tio
n(H
z)
Time in seconds
PSS4B(Normal Gain)PSS4B(High Gain)Existing PSS
Field : 50 MVARS step Simulation : step on Vref
LG2 power plant : unit 8LG2 power plant : unit 8
Test set-up at LG2 : in the control panel
Test set-up at Gentilly nuclear plant
ConclusionsConclusionsA new concept of PSS was presentedMB-PSS : a Delta Omega PSS with 3 working bandsIEEE model : PSS4BSimplified setting method : 3 Central Frequencies (FL, FI, FH) and 3 Gains (GL, GI, GH) Damping performances on Hydro-Québec system
Simulation results (small signal MIMO modeling) Close loop field tests
Validation of PSS4B modelMB-PSS will be used in all future projects at Hydro-Québec :