WT3 and WT4 Changes 0711 - WECC
Transcript of WT3 and WT4 Changes 0711 - WECC
Proposed Modifications to the WT3 and WT4 Generic Models
Pouyan [email protected] REMTF7/11/11
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GENERIC WIND TURBINE GENERATOR MODELS
• Presently, first generation of models exist in GE PSLF® and Siemens PTI PSS®E
• Developed through WECC REMTF
• Next generation under discussion in both WECC REMTF and IEC TC88 WG27
• Both groups working in collaboration
• Summary memo of all proposed changes in [1]. Other main references are [2], [3], [4], [5] and [7].
• Group effort with many folks and organizations involved, including ABB, Alstom, EPRI, GE, NREL, REPower, Risø, SNL and Siemens.
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CONTEXT OF PRESENTATION
• Please note what is presented here is a work in progress
• These are proposed changes being considered and tested
• Nothing presented here should be assumed as final or yet approved
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WT4 MODEL
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PROPOSED MODIFICATIONS – Q CONTORL [2]
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PROPOSED MODIFICATIONS – P CONTORL [2]
New
New
From
WT3
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SIMULATING THE SAME EVENT
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PROPOSED CHANGE TO WT3 MODEL [5]
Vterm
1 2
Vterm
Active-ReactiveCurrent Priority
G(1 + 1/sTi)
G(1 + 1/sTi)
1
T.s+1
1
T.s+1
s
-+
Isorc
wt3e
Ireactive_Ref
Iactive_Ref
Vterm/Xpp
PowerSystem
Transformation intoGrid Coordinates
CurrentLimitation
Simple representation of stator-dynamics
The goal is to take into account the basic physics of the doubly-fed machine. Replace the first order filters at current output with filters + PI-controllers and negative feedbacks as it is shown in Figure. THIS DOES NOT model any actual controls, butit can be shown that it represents in simple terms the physics of the machine (see [5]).
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Possible WT3+4 Model?
ElectricalControls
Ipcmd
Iqcmd
Pe
PrefVref or
Qref or
pfref Vt
g
Qe
errPord
Generator/Converter
φ∠Isoc
Pe Qe
Aerodynamics/Drive Train
Pe
g
Pref
Pmo
o
o
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Electrical Controls
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Electrical Controls
• The Ipord and Iqord (current order) are then passed through a set of logic statements that determine Ipcmdand Iqcmd (current command)
• The logic statements essential determine the maximum and minimum real and reactive current limits based on P or Q priority and whether or not a voltage-dip is in effect
• The details are discussed in the various references and working models
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Generator/Converter
11 + s Tg
s20
⎟⎠⎞
⎜⎝⎛ +
TicsKpc
.11
11 + s Tg
s21
⎟⎠⎞
⎜⎝⎛ +
TicsKpc
.11 Reference Fram
e Rotation
Grid ReferenceFrame
Controls ReferenceFrame
s18
s19
11 + s Tg
s21
11 + s Tg
s22
Ipcmd
Iqcmd
WT3 or 43
3
4
4
3
3
4
4
φ∠IsocRe
Im
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Aerodynamics [6] & Drive Train
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VALIDATION & SIMULATION
Simulation, simply to confirm that the models match
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VALIDATION & SIMULATION
- Just a simulation
- Does not represent any equipment
- Simply illustrating the various modes of the model
0 2 4 6 8 100
0.2
0.4
0.6
0.8
1
1.2
Time (seconds)
Pe
(pu)
Pflag=0Pflag=1
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DISCLAIMER
• The following show validation results from factory test data graciously provided by ABB Oy, LV Drives, Helsinki, Finland, under an NDA with EPRI
• Presented experimental results show an example of ABB multi-megawatt full-converter and DFIG wind turbine drive transient behavior and not a typical transient performance of current ABB DFIG WT converter technology. The results must not be reproduced and/or used without written permission from ABB Oy, LV Drives, Helsinki, Finland.
• NOTE: It should be fully understood that the intent of the exercise here, and data presented, is to illustrate the process of model validation. The data is from some example factory tests and is not representative of all the capabilities of the equipment. The actual equipment is flexible and able to cater to various grid codes etc. Questions, comments or concerns related to the actual equipment should be addressed to the equipment manufacturer.
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VALIDATION & SIMULATION
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10
0.2
0.4
0.6
0.8
1
Time (seconds)
V (
pu)
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VALIDATION & SIMULATION
Fit of WT4 generator; Data provide by ABB under NDA to EPRI
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VALIDATION & SIMULATION
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10
0.2
0.4
0.6
0.8
1
Time (seconds)
V (
pu)
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VALIDATION
Fit of WT3 generator; Data provide by ABB under NDA to EPRI
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CONCLUSION
• Work in progress for modifying WT3 and WT4 models
• Possibility of merging the models?
• Are the modifications to the generator models needed?
• Do we need shaft dynamics represented for the WT4? (dynamic break)
• Do we need some sort of representation of crow-bar action?
• Note: unbalanced faults are a different story for WT3, not discussed here.
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REFERENCES
[1] Y. Kazachkov and P. Pourbeik, “Review of discussions on structure and functionality of wind generic model”, Memorandum to IEC TC88 WG27, May 6, 2011.
[2] P. Pourbeik, “Proposed Changes to the Type 4 Generic Wind Turbine Generator Model (WT4)”, Memorandum to IEC, WECC and P173, May 12, 2011.
[3] A. Ellis, Y. Kazachkov, E. Muljadi, P. Pourbeik and J. Sanchez-Gasca, “Description and Technical Specifications for Generic WTG Models – a status report”, Proceedings of the 2011 IEEE PES PSCE, March 2011, Phoenix, Arizona, USA.
[4] S. Seman, “WT 4 (full converter RMS model) – IEC 61400-27-1; for Working Draft 4.6 – updated version”, 5/4/11.
[5] J. Fortmann, S. Engelhardt, J. Kretschmann, C. Feltes, M. Janssen, T. Neumann and I. Erlich, “Generic Simulation Model for DFIG and Full Size Converter based Wind Turbines”, Workshop on Large-Scale Integration of Wind Power into Power Systems, Quebec, October 2010
[6] W. W. Price and J. J. Sanchez-Gasca, “Simplified Wind Turbine Generator Aerodynamic Models for Transient Stability Studies”, Proceedings of the IEEE PSCE 2006.
[7] S. Seman, J. Simolin, J.-P. Matsinen, J. Niiranen,"Validation of Type 4 Wind Turbine Generic Simulation Model by Full-Scale Test", Proceedings of The 9th International Workshop on Large-Scale Integration of Wind Power, Québec/Canada, October 2010.