methods of defining generator synchronizing power … · methods of defining generator...

Methods of defining generator

synchronizing power during low

frequency oscillations

Pavel Kovalenko

AlteroPower, Yekaterinburg, Russia

EPCC 13 in Bled, Slovenia

Presentation structure

2

Research background

Assessing generator participation in LFO

Results

Future perspectives

Conclusion

Presentation structure

3

Research background

Assessing generator participation in LFO

Results

Future perspectives

Conclusion

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

Case of LFO in Russian power system

5

Case of LFO in Russian power system

6

Case of LFO in Russian power system

7

Presentation structure

8

Research background

Assessing generator participation in LFO

Results

Future perspectives

Conclusion

Power-angle diagram

9

Psync=dP

dθ

Defining generator load angle

10

Direct measurements

Deriving from measurements involving

excitation parameters values

Deriving from measurements of stator

parameters only

Load angle of the generator

11

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

Measuring the load angle - model

12

https://www.ntcees.ru/eng/start.php

Measuring the load angle - model

13

http://www.prosoftsystems.ru/eng/about_en.htm

Load angle measurement

14

Presentation structure

15

Research background

Assessing generator participation in LFO

Results

Future perspectives

Conclusion

Initial data – Stator current

16

Initial data – Stator voltage

17

Initial data – Voltage-current angle

18

Initial data – Excitation current

19

Initial data – Rotor angle (10 kHz)

20

Results – Load angle

21

Results – Synchronizing power

22

Results statistical assessment

23

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

Presentation structure

26

Research background

Assessing generator participation in LFO

Results

Future perspectives

Conclusion

Generators controllers monitoring

27

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.

Generators controllers monitoring

28

Local means of generators controllers

monitoring on-site

TPA-02 PMU

Automatic WAMS Data Acquisition and

Processing System

29

On-site equipment scheme

30

Presentation structure

31

Research background

Assessing generator participation in LFO

Results

Future perspectives

Conclusion

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

Thank you for attention.

Any questions?

Pavel Kovalenko, kovalenko@alteropower.ru

AlteroPower, Yekaterinburg, Russia – www.alteropower.com

EPCC 13 in Bled, Slovenia