implementation of a current transformer model in … of a current transformer model in ... settings...
TRANSCRIPT
Oleg BAGLEYBTER
Implementation of a current transformer model in Simulink® based on Jiles-Atherton theory of
hysteresis
GRID
CIGRE 2013 Yekaterinburg
Existing CT models – PSCAD, RTDS
Disadvantage:
© ALSTOM 2010. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subject to change without notice. No representation or warranty is given or to be implied as to the completeness of information or fitness for any particular purpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
Disadvantage:
The built-in burden and leads do not allow creating complex protection schemes
Creating CT model in MATLAB/SIMULINK
Main drivers:
1. More flexibility with external burden connection to model complex CT arrangements
II −
© ALSTOM 2010. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subject to change without notice. No representation or warranty is given or to be implied as to the completeness of information or fitness for any particular purpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
BAII −
2. Integrated development and testing of protection algorithms in SIMULINK environment
Mathematical model: well-established Jiles-Atherton theory of electromagnetic hysteresis, parameters identical to RTDS and PSCAD models
CT model algorithm based on Jiles-Atherton hysteresis theory
δ
H PREVH
modk
H
M
)(nδ
anM
eH
eH
H
M
eH
e
an
dH
dM
dH
dM M
e
an
dH
dM
anM
modk
δ
© ALSTOM 2010. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subject to change without notice. No representation or warranty is given or to be implied as to the completeness of information or fitness for any particular purpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
ev
dtdB
dH
dtdH
dH
dM
dtdM
s
1
M
H
s
1
dt
dB
dt
dH
dt
dM
2i
1i
2i
ev
CT model in SIMULINK
© ALSTOM 2010. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subject to change without notice. No representation or warranty is given or to be implied as to the completeness of information or fitness for any particular purpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
Three separate CT models developed:
Advanced settings CT model:
Settings identical to PSCAD and RTDS models (18 parameters in total)
Simple settings CT model:
Only 5 parameters: knee-point voltage and
© ALSTOM 2010. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subject to change without notice. No representation or warranty is given or to be implied as to the completeness of information or fitness for any particular purpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
Only 5 parameters: knee-point voltage and current, pri/sec ratio, secondary resistance, remnant flux
Air-gapped CT model:
EXPERIMENTAL (has not been tested against real physical CTs)
Application examples:1. Building complex CT schemes
BAII −
0.66 seconds of real time per 1 second of simulation
© ALSTOM 2010. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subject to change without notice. No representation or warranty is given or to be implied as to the completeness of information or fitness for any particular purpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
Application examples:2. Studying the Saturation phenomenon
© ALSTOM 2010. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subject to change without notice. No representation or warranty is given or to be implied as to the completeness of information or fitness for any particular purpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
Application examples:3. Transient Biasing in Current Differential
..THRDIFFI
DIFFI
© ALSTOM 2010. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subject to change without notice. No representation or warranty is given or to be implied as to the completeness of information or fitness for any particular purpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
..THRDIFFI
DIFFI
BIASTRI .
Application examples:4. Provisional CT requirements testing in SIMULINK
In order to test the
Linear search of RLIM
for specified combinations of If, X/R, fault type, POW
© ALSTOM 2010. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subject to change without notice. No representation or warranty is given or to be implied as to the completeness of information or fitness for any particular purpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
In order to test the protection with different CT remanence values every fault is applied six times: three times with a positive DC component and three times with a negative DC component.
Application examples:5. Subcycle Current Differential protection
Estimated reduction of the development time through
© ALSTOM 2010. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subject to change without notice. No representation or warranty is given or to be implied as to the completeness of information or fitness for any particular purpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
RTDS test results:
Subcycle operation 17ms for fault currents If > 2*InomPatent pending
Estimated reduction of the development time through the use the SIMULINK CT models: 6 man-weeks
www.alstom.comwww.alstom.com