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Methods of defining generator
synchronizing power during low
frequency oscillations
Pavel Kovalenko
AlteroPower, Yekaterinburg, Russia
EPCC 13 in Bled, Slovenia
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Presentation structure
2
Research background
Assessing generator participation in LFO
Results
Future perspectives
Conclusion
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Presentation structure
3
Research background
Assessing generator participation in LFO
Results
Future perspectives
Conclusion
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Research background
4
Low frequency
oscillations arise
Changing
properties of
power systems
Large-scale power
systems
Distributed
generation
integration
Modern
equipment with
fast regulators
Detecting LFO and their parameters
on-line WAMS
Developing countermeasures
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Case of LFO in Russian power system
5
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Case of LFO in Russian power system
6
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Case of LFO in Russian power system
7
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Presentation structure
8
Research background
Assessing generator participation in LFO
Results
Future perspectives
Conclusion
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Power-angle diagram
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Psync=dP
dθ
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Defining generator load angle
10
Direct measurements
Deriving from measurements involving
excitation parameters values
Deriving from measurements of stator
parameters only
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Load angle of the generator
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salient-pole machine round-rotor machine
U1=Uc
jxqIq
I
Ef
jxdId
d
Id
Iq
φ
θ
ψ
q
Ud
Uq
RId RIq
φθ
ψ I
RI
U
jxcIEf
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Measuring the load angle - model
12
https://www.ntcees.ru/eng/start.php
https://www.ntcees.ru/eng/start.php
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Measuring the load angle - model
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http://www.prosoftsystems.ru/eng/about_en.htm
http://www.prosoftsystems.ru/eng/about_en.htm
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Load angle measurement
14
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Presentation structure
15
Research background
Assessing generator participation in LFO
Results
Future perspectives
Conclusion
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Initial data – Stator current
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Initial data – Stator voltage
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Initial data – Voltage-current angle
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Initial data – Excitation current
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Initial data – Rotor angle (10 kHz)
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Results – Load angle
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Results – Synchronizing power
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Results statistical assessment
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Synchronizing power (W)
1
(measured)
2 (with
excitation)
3 (without
excitation)
Average 4124 4276 4979
Maximum 5953 5879 5895
Minimum 1486 1872 4401
Standard deviation 358 433 123
Average difference 151 854
Difference standard
deviation
425 284
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Presentation structure
26
Research background
Assessing generator participation in LFO
Results
Future perspectives
Conclusion
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Generators controllers monitoring
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Controllers monitoring system involves
detecting the following distinctive failures:
detecting improper controllers operation;
failure to keep within parameters limits.
Controllers monitoring is a distributed and
hierarchical system with the unified control
center based on measurements of generators
operation parameters.
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Generators controllers monitoring
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Local means of generators controllers
monitoring on-site
TPA-02 PMU
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Automatic WAMS Data Acquisition and
Processing System
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On-site equipment scheme
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Presentation structure
31
Research background
Assessing generator participation in LFO
Results
Future perspectives
Conclusion
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Conclusion
32
For the test case disturbance at the
considered generator the derivation
methods show reasonable results
Taking excitation measurements into
account allows to get more accurate values
close to the measured ones
Involving this method may lead to an
impressive effect regarding controllability of
the system along with economics as well
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Thank you for attention.
Any questions?
Pavel Kovalenko, [email protected]
AlteroPower, Yekaterinburg, Russia – www.alteropower.com
EPCC 13 in Bled, Slovenia
mailto:[email protected]://www.alteropower.com/
