WT3 and WT4 Changes 0711 - WECC

Proposed Modifications to the WT3 and WT4 Generic Models

Pouyan [email protected] REMTF7/11/11

2© 2011 Electric Power Research Institute, Inc. All rights reserved.

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.


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


WT4 MODEL


PROPOSED MODIFICATIONS – Q CONTORL [2]


PROPOSED MODIFICATIONS – P CONTORL [2]

New

New

From

WT3


SIMULATING THE SAME EVENT


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]).


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


Electrical Controls


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


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


Aerodynamics [6] & Drive Train


VALIDATION & SIMULATION

Simulation, simply to confirm that the models match



- 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


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.



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)



Fit of WT4 generator; Data provide by ABB under NDA to EPRI



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)


VALIDATION

Fit of WT3 generator; Data provide by ABB under NDA to EPRI


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.


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.

WT3 and WT4 Changes 0711 - WECC

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