Voltage quality regulation in Sweden
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Voltage quality regulation in Sweden Lars Ström, Math Bollen, Rémy Kolessar Energy Markets Inspectorate Eskilstuna, Sweden
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Voltage quality regulation in Sweden. Lars Ström, Math Bollen, Rémy Kolessar Energy Markets Inspectorate Eskilstuna, Sweden. Voltage quality in Sweden. Responsibility of the network operator Monitoring only for internal use, no publication The regulatory process is triggered by a complaint - PowerPoint PPT Presentation
Transcript of Voltage quality regulation in Sweden
Voltage quality regulation in Sweden
Lars Ström, Math Bollen, Rémy Kolessar
Energy Markets InspectorateEskilstuna, Sweden
Frankfurt (Germany), 6-9 June 2011
Responsibility of the network operator Monitoring only for internal use, no publication The regulatory process is triggered by a complaint Step 1: try to reach agreement Step 2: the regulator investigates the case Step 3: the regulator can enforce measures by the
network operator
Lars Ström – Sweden – S2 – 168
Voltage quality in Sweden
Frankfurt (Germany), 6-9 June 2011
What is acceptable voltage quality?
Existing situation: EN 50160 Soon: a new set of limits
100% values for most of the EN 50160 levels EN 50160 for flicker New requirements for dips and swells Limits on duration of interruptions
No complaints = acceptable quality
Lars Ström – Sweden – S2 – 168
Frankfurt (Germany), 6-9 June 2011
Voltage-quality variations
Harmonics EN 50160 levels hold 100% of time MV levels for HV harmonics 17 – 25
Unbalance At most 2%, 100% of time
Flicker 95% of Plt during one week less than 1.0
Slow voltage variations All 10-minute values between 90 and 110%
Lars Ström – Sweden – S2 – 168
Frankfurt (Germany), 6-9 June 2011
Responsibility sharing curve
Installations should tolerate these dips
Limitations on the number of dips
Duration of the dip
Res
idua
l vol
tage
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Voltage dips: Swedish regulation
Installations should tolerate these dips
A reasonable number of dips is acceptable
Dips are unacceptable
Duration of the dip
Res
idua
l vol
tage
Lars Ström – Sweden – S2 – 168
Frankfurt (Germany), 6-9 June 2011
How to choose the curves?
Dips, up to 45 kV CIGRE/CIRED/UIE working group C4.110
Dips, above 45 kV Discussion between the stakeholders
Swells, up to 1 kV Protection requirements microgeneration Highest overvoltages during earthfaults Experiments on equipment damage
Lars Ström – Sweden – S2 – 168
Frankfurt (Germany), 6-9 June 2011
Nominal voltage 45 kV and less
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0.2s 0.5s 1s 5s
40%
70%
90%
60s
Frankfurt (Germany), 6-9 June 2011
Nominal voltage above 45 kV
Lars Ström – Sweden – S2 – 168
0.2s 0.5s 1s 5s
40%
70%
90%
60s
80%
Frankfurt (Germany), 6-9 June 2011
Voltage swells, up to 1 kV
Lars Ström – Sweden – S2 – 168
0.5s 5s
111%
115%
60s
135%
Frankfurt (Germany), 6-9 June 2011
Interruptions – maximum duration
Lars Ström – Sweden – S2 – 168
Frankfurt (Germany), 6-9 June 2011
Conclusions
New specification on what is considered acceptable voltage quality
Variations: 100% of time Dips and swells: responsibility sharing Interruptions: maximum duration
Experience to be gained on what are reasonable numbers of dips and swells
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