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Department of Electrical Engineering, Faculty of Mechatronics Technical University of Liberec - Czech Republic. Influence of lighting systems on power nets. Jan Václavík, Aleš Richter. Lighting systems of our interest. Small and medium size, nominal power from 1 to 100 kW - PowerPoint PPT Presentation
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Influence of lighting systems on power nets
Jan Václavík, Aleš Richter
Department of Electrical Engineering, Faculty of Mechatronics Technical University of Liberec - Czech Republic
Lighting systems of our interest
Small and medium size, nominal power from 1 to 100 kWRather high density, small area up to 104 m2
All types of discharge lamps operated on magnetic ballastsOffices, factory halls, commercial centers
Outcommings from power-net and lighting system interractions
Production of light and consumption of electrical energy Distortion of power-net currentIrregular instabilities – over- or undervoltageRegular instabilities – current oscillations
Distortion of power-net current
Changes in conductivity of discharge GL=f(GL, IB)
Nonlinearity of ballast inductor LB=f(IB)
0 0.005 0.01 0.015 0.02 0.025 0.03 0.035 0.04-400
-300
-200
-100
0
100
200
300
400
Time [s]
U´F
IX [
V],
IF
IX
[0,0
33
*A],
G
L/G
LMIN
[1
]
UFIX
IFIX
0 100 200 300 400 500 600 700 800 900 1000
-80
-70
-60
-50
-40
-30
-20
-10
0
Frequency [Hz]
Am
plit
ud
e [
dB
]
Irregular instabilities
Occurs only during some transient states, with specific parallel load and energetic balance in power-netDuring startup, load variations, voltage fluctuationsFlickeringUnpredictable out of our concern
0 0.005 0.01 0.015 0.02 0.025 0.03 0.035
-300
-200
-100
0
100
200
300
t [s]
Usvit.
Isvit.G
vyboj
Regular instabilities
Result to prevailing or regularly repeating consequencesPredicableCurrent oscillations
Current oscillations
Oscillations of RNET-LNET-CCOMP circuit
~
RN
RLC obvod
LN
C
L
Lamp
Power net Lighting system
0 0.005 0.01 0.015 0.02 0.025 0.03 0.035 0.04-400
-300
-200
-100
0
100
200
300
400
čas [s]
U´F
IX [
V],
I FIX
[0,0
33
*A],
G
L/G
LMIN
[1
]
UFIX
IFIX
GL/GLMIN
UFIX
IFIX
GL/GLMIN
Simulation and experiments
Computer model of lighting system and associated power-netConductivity model of discharge lampNon-linear model of ballast inductorSimple model of ballast capacitorModel of power net in form of equivalent lumped circuit parameters
Results from simulationsCCOMP=0, LNET=0
0 0.005 0.01 0.015 0.02 0.025 0.03 0.035
-300
-200
-100
0
100
200
300
t [s]
Usvit.
Isvit.G
vyboj
Results from simulationsCCOMP=4.5 μF, LNET= 21 mH
0 0.005 0.01 0.015 0.02 0.025 0.03 0.035
-300
-200
-100
0
100
200
300
t [s]
UFIX
IFIX
GLAMP
Laboratory model of lighting system
Fitting for 24 fluorescent lamp with magnetic ballastsAllows switching between different ballast and compensationBehavior like a real lighting systemComfortable measurements
Work done
Finished measurement and analysis of current oscillations in lighting systemsFinished building of mathematical and laboratory model of lighting systems Successfully produced the same current distortion in models as is realityModels proves to be useful for testing hypotheses
Work in progres
Precautions against current oscillations
~
RNET
LNET
CC Ballast
Lamp
Supply net Lighting system
LF
Filter
Work to do…
Fine-tune parameter of the mathematical modelSuggest and test contra-measurements against rise of current oscillationsTest those contra-measurements on real lighting systems
