Power electronic event 2015

’s Hertogenbosch 23 juni

Prof. dr. ir. J.F.G. Cobben

It is all about Smart!

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– Second level

The future electricity network!

1

From consumers to producers

Not only generation but also additional load

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Even more important in a “smart grid”

PQ and “smart grids”

HV

MV

LV

G

G

L

L

L

G

Smart grids:

More information needed

More control needed

Propagation PQ

“Predict and prevent”

6

MS-LiveLab Alliander

Intelligence

Interconnect

Instrumentation

From

network and

hardware to

data en

data-

applications

Sensors placed in the network

• Part of the MV-network

• Parts of LV-networks

8

Substation MV/LV

9

Substation MV/LV

10

Substation MV/LV

Functionalities Live lab

Optimalisation

Network

performance

Investments

Losses

Fault prediction

Power Quality trend

………..

………..

Measurement in LV-network

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It is all about to make the system “smart”

PAGE 13

From “blind and happy”

How to measure power of distorted waveforms precisely?

The next generation photovoltaic inverter

Flexible LV grid interface for controllable PV production and EV charging

Electric vehicle charging by PV

A DC socket outlet in your house?

Towards a DC distribution system – opportunities and challenges

Without electricity the world stops turning

The importancy of optimal quality of voltage and current

To “state estimation and alert”

DC – An interesting topic

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Power Quality problems

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Problems related to PV-systems

• Overloading of transformer and overvoltages!

2 kW

Protection

?

Voltage dip

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Research related to voltage dips

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N0

1 2

N3

4 56

7 8 9

N10

N15

0

10Primary protective

device

Secondary protective device

3

Grid

.

.

.

DG

...

150kV

10kV

9 other feeders

CB1

CB2

CB3

Local feeder

Neighboring feeders

11 12 13 14 15

Research related to voltage dips

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Inrushcurrents (contactors/circuit breakers)

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The capacitor has the capacity to create problems in the network

Harmonics and monitoring

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15th harmonic voltage problem has to be solved!

Cable cross section

• With high harmonic distortion

B-16A

3 3

Without harmonics: 16 mm2

With 3rd harmonic: 25 mm2

With all harmonics: 35 mm2

PF and the need for compensation

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0 0,85 1

PF=0,6 DPF=0,9

222 DQPS

How to define the content of the glass?

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Reactive power

Active power

Harmonic distortion makes it

difficult to define the quality of the beer!

Examples of non-compatibility

PV

Knowledge and education: Key to smart!

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