CFH Markup Setting Out-Of-Step Protection Using Dynamic Simulations DR2

7/28/2019 CFH Markup Setting Out-Of-Step Protection Using Dynamic Simulations DR2

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Setting Out-Of-Step

Blocking or Tripping UsingDynamic Simulations

Yofre JacomeCOESPeru

Western Protective Relaying Conference

October, 2011

Charles HenvilleHenville Consulting

Inc.

Prepared by


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2

Overview

Power Swing and Out-Of-Step

A Power Swing causes a Southern Peru

blackout An example setting study using Dynamic

Simulations and relay models in the same

software

Conclusions


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0

50

100

150

200

0 1 2 3 4 5

time (s)

Angle(Degrees)

Loss of synchronism

Oscillations leading to

stable equilibrium


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Distance Relays

4


P1

P2

P3

P1 : Steady state stability limit

P2: Transient stability limitP3 : Loss of synchronism


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Power Swing

Out-Of-Step

X

R

Power Swing

Out-Of-Step


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t/s-0.2 -0.1 -0.0 0.1 0.2 0.3 0.4 0.5 0.6

IR R

-10

0

10

t/s-0.2 -0.1 -0.0 0.1 0.2 0.3 0.4 0.5 0.6

IS R

-10

0

10

t/s-0.2 -0.1 -0.0 0.1 0.2 0.3 0.4 0.5 0.6

IT R

-10

0

10

t/s-0.2 -0.1 -0.0 0.1 0.2 0.3 0.4 0.5 0.6

VR R

-50

0

t/s-0.2 -0.1 -0.0 0.1 0.2 0.3 0.4 0.5 0.6

VS R

-50

0

t/s-0.2 -0.1 -0.0 0.1 0.2 0.3 0.4 0.5 0.6

VT R

-50

0

A power Swing is Usually Considered as an Three PhasePhenomena


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A Trip During a Power Swing

SICN SISUR

Mantaro Cotaruse Socabaya

L-2054

L-2053

300 km 300 km

L-2052

L-2051

North-Center area (SICN) of the Peruvian power system

interconnection with the South area (SISUR),


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L-2053 trips 3 phase simultaneously with single phase trip

on line L-2054

Trigger14/01/2010

02:41:57 p.m..593

t/s-0.4 -0.2 -0.0 0.2 0.4 0.6 0.8 1.0 1.2

SUM_CT_IL1/kA

-2

-1

0

1

t/s-0.4 -0.2 -0.0 0.2 0.4 0.6 0.8 1.0 1.2

SUM_CT_IL2/kA

-2

-1

0

1

t/s-0.4 -0.2 -0.0 0.2 0.4 0.6 0.8 1.0 1.2

SUM_CT_IL3/kA

-2

-1

0

1

t/s-0.4 -0.2 -0.0 0.2 0.4 0.6 0.8 1.0 1.2

LINE1_UL1/kV

-200

-100

0

100

t/s-0.4 -0.2 -0.0 0.2 0.4 0.6 0.8 1.0 1.2

LINE1_UL2/kV

-200

-100

0

100

t/s-0.4 -0.2 -0.0 0.2 0.4 0.6 0.8 1.0 1.2

LINE1_UL3/kV

-200

-100

0

100

Two phases carry the

power that was in sixOut of step

condition trips

remaining

two phases


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Power Swing during the

dead time of the single

phasereclosing T

The rate of change of apparent impedance slows down

as the swing angle increases


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System wide review of power

swing protection

Simulations carried out on power system

model with relay models included

Simulates system dynamic performance

And also simulates relay performance in

the same software


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Load

Fault

Power Swing

11

3 Phase fault near Mantaro

2121


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L-2052 3 phase fault near

Cotaruse

Load

Fault with series capacitor in service

Out-Of-Step

470 /sec

Fault with series capacitor by-passed

12

2121


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Load

Fault with series

Capacitor in service

Out-Of-Step

650 /sec

Fault with series

Capacitor by-passed

131313

21 21


Cotaruse


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Load

Fault

Power Swing


Socabaya

141414

21 21


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Power swing blocking for external

fault


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Power swing impedance may

remain in the first quadrant


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Conclusions

Weakened transmission during single phase open

conditions may cause a power swing

Combined modeling of power system dynamics and relayperformance enhances the settings process

Knowing the rate of change of impedance allows trip and

block timers to be set easily


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Conclusions

Out-Of-Step tripping must not be applied in all the lines.

Separation points should be carefully chosen in order to

save the system after out-of-step tripping.

As a result of the analysis of the event in the Peruvian

Power System, and the Coordination Study. Power swing

blocking and tripping functions were activated.


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Questions?

CFH Markup Setting Out-Of-Step Protection Using Dynamic Simulations DR2

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