Network simulations for optimum utilization of electricity ...ta.twi.tudelft.nl/.../presentation_bhattacharyya.pdf · Network simulations for optimum utilization of electricity grid

Network simulations for optimum

utilization of electricity grid –

From an Utility perspective

Sharmistha Bhattacharyya, Yolanda Knops

Endinet, Eindhoven

22nd November 2012

A DIAM-TU Delft seminar on “Future challenges in modelling power systems”

Contents

• Company profile

• Endinet’s grid structure

• Future changes in energy delivery system

• Network simulations in use and future challenges

2

Alliander & Endinet

Management of gas and electricity grids

Management of gas and electricity grids

Solutions for complex energy infrastructures

From 2010, Endinet has become a part of Alliander

Alliander: the largest network company in the Netherlands

3

Our mission & vision

Constructing, maintaining and managing energy networks 1

Ensuring a reliable, affordable and safe energy supply 2

Contributing to (sustainable) developments for customers and society (cooperation)

3

Contributing to a better society 4

4

5

Energy Supply-Delivery Chain

Delivery/ Users

Networks/ grid

operation

Regulated Liberalised

Production

Liberalised

6

Alliander at a glance

Alliander’s service area

38% market share

3 million customers (E)

2.6 million customers (G)

100% Publicly owned

6,044 employess (FTE)

Electricity

• Transport: 1080 GWh / year

• Customers: 108.000

Endinet’s Service Area

Eindhoven

(North Brabant)

Gas

• Transport: 1100 miljoen m3

• Customers: 400.000

7

Endinet’s grid infrastructure

8

230 V

10 kV

150 kV

SCADA

LS verdeelkast/

OV verdeelkast

Transformator-

stations

Hoofdkabel

Aansluitkabel

Distributie

kabels

Wijkverdeel-

stations

Hoofdverdeel-

stations

Transport

kabels

Stamvoedingen

Inkooppunt

Enexis

- Elektriciteitsnet

- Aardingsnet

- OVnet

- TFnet

- Signalering

9

10 kV

3 x

in E

HV

.

Main

distribution

station

E-distribution network in Eindhoven

Local

Distribution

station

400 V

Distribution

box

Transformer

station

10 kV

108.000 LV

clients

Medium voltage

industrial and

commercial clients

Ene

xis

Endin

et

To provide reliable, safe and

good quality electricity

Expected Changes in energy delivery

system in the future

10

11

Expected changes in energy production

Growth of small-scale decentralized generators (DG) for electricity generation

and increase in biogas production

Expectation: 15-20% electricity production by DGs in 2025

12

Expected changes in energy usage

Increase in electricity demand because of large usage of electric cars and

heat pumps

Expectation: electricity demand will increase by 32-45% in 2025, however, gas

demand will reduce because of better insulation of houses

In 2025, it is expected to have 1 milion

electric cars in the Netherlands.

In 2025, 80% of the new houses in the

Netherlands will have heat pumps..

Upcoming challenges for the network operators

• From few large-scale power plants to many

decentralized production units

• Need for monitoring and controlling energy flows,

large scale introduction of ICT

• Need for large storage capacity

• Local balancing of supply and demand

• Maintaining power quality/decreasing interruptions

A smart grid is needed to optimize grid operation! 13

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Network simulations in use in Endinet and

future challenges

Network simulations in use

Criteria Electrical simulation needed

• Planning of network’s loads

• Optimizing network components

Load flow, short circuit calculations

• Ensuring safety to electricity

service and network assets

Protection coordinations, safe touch

voltage calculation

• Good quality electricity with in the

standard limiting values

Transient simulations, harmonics

analysis, etc.

15

Tools: Vision, Gaia, Power Factory

Present electricity demand of an

average household

16 Daily peak load demand per house can be as high as

1000W!

Simultaneous

usage factor is

included in

network

design!

Load flow analysis

17

Voltage &

loading

profiles

Safety analysis

18

Analyse

safety in

service

Other simulations

- transients, harmonics, voltage dips

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Check voltage

quality as per

standard!

Challenges for Endinet’s grid

Is Endinet’s network ready for the future situation? 20

Challenge1:

Many clients with solar panels

Sunny and clear day

Partially cloudy day

Bi-directional power flow

Production depends on local

weather

21

Amount of charging load per customer

Charging characteristic: slow, fast

Time slot of the car charging

Challenge 2:

Many clients with electric vehicles

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Fast charge

Slow charge

Last minute

Baseline

Future challenges in network

simulations

• Continuously variable power flow profile in the network

• Simultaneous loading factor will be high

• On-line data collection (smart metering) and quick communication with

the clients

• Fast simulation tools are needed to facilitate demand-supply match

• Voltage quality conditions should be verified continuously

• Loading and status of network components (e.g. cables, transformers)

need to be checked regularly

23

Questions?

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