Frankfurt (Germany), 6-9 June 2011 Irina Melnik – the Netherlands – Session S2 – 0665...

Frankfurt (Germany), 6-9 June 2011

Irina Melnik – the Netherlands – Session S2 – 0665

Intelligent Distribution Substation improves power quality


Need for new technologies

Monitoring and control New technologies

Changes in power flows Larger voltage variations

Uncertainty for planning Complex grid operation

Fluctuating loads Distributed generation

MV

LV

Load

Power

MV

LV

Load

Power

PowerPowerMV

LVMicroCHP PV

MicroCHP

MicroCHP

Generation

PV

Load

MV

LVMicroCHP

MicroCHP PV

MicroCHP

MicroCHP

MicroCHP

MicroCHP

Generation

PV

Load


Intelligent distribution substation (IntDS)

Additional functions of the IntDS: Monitoring Control Improving Power Quality

Developed by a consortium of Dutch industries

Installed and tested in the grid of DSO Alliander


“Intelligent” components of IntDS

Electricity storage systemwith bidirectional inverter

Measurement system

Smart Transformer


IntDS implementation

District with large amount ofmicro Combined Heat Powerat customers


Test program

Voltage control Reduction of harmonic distortion Reduction of flicker Mitigation of voltage dips

Power Quality improvement by the IntDS:


Voltage control

Performed by Smart Transformer:

Electronic tap changer ensuresa constant voltage level on the LV rail of the IntDS.

The voltage control set-pointhas to be determined to achievethe optimal voltage level on PCC’sof all LV customers.

Smart Transformer


Voltage control – test resultsU avgU maxU min

LV bus-bar

1 2 3

control no control

LV customer

1 2 3

control no control


Harmonic distortion reduction

Performed by ESI(Electricity storage inverter) :

Resistive harmonic damping

Passive harmonic dampingThe filter capacitors of the ESI take part in the filtering of harmonics. Electricity storage system

with bidirectional inverter


Harmonic distortion reduction – test resultsH03 maxH05 maxH07 maxTHD max

LV bus-bar control nono control

LV customer controlno control no


Voltage dips mitigation

Can be performed by:the Smart Transformerthe ESI (Electricity storage inverter)

Voltage dips occur only a few times per yearon an LV bus-bar of Dutch distribution substations.That’s why this functionality is not actively tested.


Flicker reduction (LV side)

Performed by:

The electronic tap changer of the Smart Transformer

The flicker reduction control of the bidirectional inverter (ESI) of the storage system.


Flicker reduction – test resultsPlt avgPst avgPlt maxPst max

LV bus-bar no control

LV customer no control


Conclusions The Intelligent substation has proved to be safe in operation.

The first field test results demonstrate a significant reduction of voltage variations, harmonic and THD levels both at the LV bus-bar of the IntDS and at the LV customers.

Further metering and test programs will be performed to set optimal set-points for control equipments.

The proved principles can be used for area’s with high levels of PQ distortions.

Irina Melnik – the Netherlands – Session S2 – 0665

Frankfurt (Germany), 6-9 June 2011 Irina Melnik – the Netherlands – Session S2 – 0665...

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Transcript of Frankfurt (Germany), 6-9 June 2011 Irina Melnik – the Netherlands – Session S2 – 0665...