RT-SIL Performance Analysis of Synchrophasor-and-Active Load-Based

Power System Damping ControllersG.M. Jonsdottir*, M.S. Almas*, M. Baudette*,

M.P. Palsson¶, L. Vanfretti*†

*KTH, Stockholm †Statnett SF, Norway¶Landsnet, Iceland

gmjon@kth.se

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Paper No:15PESGM2009

Background

• The Icelandic power system is heavily loaded. – Idea: Active load modulation of industrial loads

(Aluminum smelters) in the systems using PMU measurements for enhancing small signal stability.

• Developed two active load control algorithms. • Tested

– Using the two area Kundur power system model (0.64Hz).

– In Real-Time Software-in-the-Loop (RT-SIL).

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Results3

55 60 65 70

3

3.5

4

4.5

5x 10

8

Time [s]

Po

we

r tr

an

sfe

red

fro

mA

rea

1 t

o A

rea

2 [

Wa

tts

]

Scenario 1: Small distrubance (5 % Change in Vref

of Generator 1)

Power Transfer Between Area 1 and Area 2

No Active Load ControlLoad Control Algorithm 1Load Control Algorithm 2

55 60 65 70 75

1.63

1.64

1.65

1.66

1.67

1.68

x 109

Time [s]

Scenario 1: Small distrubance (5 % Change in Vref

of Generator 1)

Load Control in Area 2

No Active Load ControlLoad Control Algorithm 1Load Control Algorithm 2

Acti

ve P

ower

Con

sum

tion

By D

ynam

ic L

oad

in A

2 (M

W)

Conclusions/Recommendations• Both algorithms provide adequate damping

for inter-area oscillations.• The algorithm is flexible to accommodate

multiple oscillatory modes. • Future work

– Test algorithm in Real-Time Hardware-in-the-Loop.• Deploy load control algorithm in an external controller,

NI-cRIO (Compact Reconfigurable I/O Controller).• Utilize wide-area synchrophasor measurements to

perform load control.

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