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ELECTRICAL ENERGY DISTRIBUTION NETWORKS: ACTUAL SITUATION AND PERSPECTIVES FOR DISTRIBUTED GENERATION

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Title: ELECTRICAL ENERGY DISTRIBUTION NETWORKS: ACTUAL SITUATION AND PERSPECTIVES FOR DISTRIBUTED GENERATION


1
ELECTRICAL ENERGY DISTRIBUTION NETWORKS ACTUAL
SITUATION AND PERSPECTIVES FOR DISTRIBUTED
GENERATION
Alessandro BERTANI CESI Milano, I
Claudio BOSSI CESI Milano, I
Bruno DELFINO University of Genoa, I
Norbert LEWALD Stadtwerke Karlsruhe, D
Stefano MASSUCCO University of Genoa, I
Elmar METTEN MVV Energie AG, D
Tim MEYER Fraunhofer ISE, D
Federico SILVESTRO University of Genoa, I
Irena WASIAK Technical University of Lodz, PL
2
DISPOWER Distributed Generation with high
penetration of renewable energy sources project
n NNE5-2001-00075
3
Work package descriptions
  • WP 1 Grid stability and control
  • WP 2 Power quality and safety
  • WP 3 Socio-economic issues
  • WP 4 Planning, training and operation tools for
    regional supply systems
  • WP 5 Information, communication and electricity
    trading
  • WP 6 Test facilities for grid stability and
    control
  • WP 7 Implementation of RE technology for
    regional supply systems
  • WP 8 Test facilities for power quality in DG
    grids
  • WP 9 Operation and quality management tools in
    low voltage grids
  • WP 10 Pilot installations and monitoring of
    distributed power generators in low voltage grids
  • WP 11Overall assessment of DG in local power
    supply systems

4
Work Package 1 2
  • Work Package 1 (Grid stability and control) is
    intended to develop equipment and system models
    capable of ensuring effective and economical
    operation of electrical networks with high
    penetration of distributed renewable energy
    sources.
  • Work Package 2 (Power quality and safety) will
    identify new standard requirements for grid
    connection of decentralized power generators with
    particular attention to islanding operation
    problems and the development of innovative
    protection methodologies and systems.

5
Work Package 3 4 5
  • Work Package 3 (Socio-economic issues) is
    oriented to evaluate the influence of new
    communication technologies and distributed
    networks on the development of supply,
    consumption and distribution of electricity.
  • Work Package 4 (Planning, training and
    operational tools for regional supply systems)
    aims at adapting existing tools for planning,
    design, operation of distributed generation
    systems.
  • Work Package 5 (Information, communication and
    electricity trading) will develop an
    internet-based information network for fast and
    secure data exchange and management.

6
Work Package 6 7
  • Work Package 6 (Test facilities for stability and
    control) The new concepts developed in the
    previous work packages need to be tested in the
    partners laboratories. Test sites will include
    distributed generators and communication
    facilities.
  • Work Package 7 (Implementation of renewable
    energy technology for regional supply systems)
    will elaborate scenarios of long term
    perspectives for distributed generation in
    Europe. Both interconnected grids and weak and/or
    isolated networks will be considered.

7
Work Package 8 9
  • Work Package 8 (Test facilities for power quality
    in DG grids) will realize a flexible low voltage
    grid structure. The scope is to evaluate
    different scenarios for the implementation of
    distributed energy sources and energy storage
    devices. A test facility with over 200 kW of
    installed power is already under development at
    CESI (Milano, Italy).
  • Work Package 9 (Operation and quality management
    tools in low voltage grids) will develop a Power
    Operation and Power Quality management system
    which will be used to control energy flows and
    power quality in low voltage grids with concepts
    allowing for use of low cost equipment.

8
Work Package 10 11
  • Work Package 10 (Pilot installations and
    monitoring of distributed power generators in low
    voltage grids) Experimental sites will be
    realized for the testing of distributed
    generators at low voltage level. Actually
    installed pilot sites are expected to be used at
    MVV (Dannenberg, Germany), at Iberdrola (San
    Agustin del Guadalix, Spain), at Stadtwerke
    (Karlsruhe, Germany).
  • Work Package 11 (Overall assessment of DG in
    local supply systems) will coordinate the
    presentation and dissemination of results through
    publications and workshops.

9
Power Quality Operation and Management
systemPOMS
  • PoMS is a communication infrastructure and
    optimisation tool for low voltage grids which is
    expected to perform power quality monitoring and
    control and to optimize grid operation through
    distributed generation control and demand side
    load management
  • A PoMS system implementation consists of a
    central PoMS unit and a communication
    infrastructure, which connects DG and measurement
    units to PoMS.

10
Power Quality Operation and Management
systemPOMS
  • collect information about topology situation and
    power quality
  • provide local strategies for power quality and
    security improvement
  • generates schedules for economically (cost) and
    technically (power quality) optimised operation
    of controllable generators and loads

11
(No Transcript)
12
National Grid Structures
  • Within the first activities of WP 2 and WP 9 in
    DISPOWER, an overview of different network
    structures (Italy, Spain, UK, Germany, Poland)
    and a preliminary classification has been
    performed.
  • The aim is to find solutions and concepts that
    can be applied easily to a certain class of
    systems.
  • Thus, a detailed description of the Low Voltage
    grids has been started by collecting the
    following information/ parameters.

13
National Grid Structure
14
Operating criteria
15
Equipment and automation
16
Load types and characteristics
17
LV network classification
18
Possible networks for the DISPOWER goals 7
19
Test sites
  • Within DISPOWER, four test sites will be set up
    in order to evaluate the performances of active
    networks and the POMS strategies.
  • A test Facility will be installed at CESI, Milan
  • MVV Energie AG will build up a solar settlement
    at the location Querdeich, Dannenberg, Germany
  • The IBERDROLA Technology Demonstration Centre
    (TDC) near Madrid
  • As a fourth test site, Stadtwerke Karlsruhe
    Germany, SWK

20
CESI test site
21
Test facility structure
The topology grid and distributed resources
configuration can be changed using control
command to the transfer switches interconnection
board.
DISH STIRLING
Hybrid PV system
MCFC ?T
?T 1
?T 2
PEM
REDOX
FLY WHEEL
VARIABLE LOAD
LOADS FIELD
Der. 1
Der. 2
Der. 3
BIOMASS
VARIABLE LOAD
PoMS
Meters
LOAD BUS-BAR
Synchronism unit
BUS-BAR 2
BUS-BAR 1
LV Transfer switches board
TELE-CONTROLLED SWITCHES INTERFACE PROTECTIONS
800 kVA
800 kVA
22
Test facility Solar Dish Stirling (1)
CESI Eurodish European Dish Stirling solar
generator system (3rd prototype in the
world) based on the SOLO 161 Stirling motor
parabolic concentrator, 8.5 m diameter, 56
m² 2000 suns, temperature 800C Two axis
tracking azimuth elevation 10 kWe 400 Vac 3
phase Asynchronous alternator grid connected
23
Electrolyte tanks
Test facility Vanadium Redox Battery (1)
42 kW 84 kWh
Stack Nominal Voltage 125 V Maximum Current 500
A Operative Voltage 100 155 V Number of cells
100 Manufacturer SUMITOMO
24
CESI Test facility Wireless communication
Wireless bridge AIRONET from Cisco up to 20 km
with special antenna, data connection speed from
1 to 11 Mb/s. Protocol is IEEE 802.11
(named Wi-Fi) Units must be provided with PCMCIA
or PCI cards Already used to interface PV hybrid
system and Solar Dish Stirling with their remote
control sites.
antenna
25
Pilot Installation MVV Solar
Settlement Querdeich
6.64 kWp thin film PV system First office
building inaugurated in July 2002 Integrated
energy concept Biomass district heating
distributed generation
  • Goals of pilot installation
  • Demonstrate high (premium) power quality in LV
    grids with high penetration of decentralised
    generation
  • Develop measuring concepts for pilot
    installations, having future massive distributed
    generation in mind
  • Demonstrate remote monitoring and control of
    representative pilot installation sites

26
Pilot Installation MVV Current Concept
  • LV grid - 400 kVA-Transformer station
    20/0,4kV - open-ring/ closed ring operation
  • Loads - private houses - office building -
    assisted living - nursing home
  • DG-Generators - PV-Generator 121kWp - CHP
    (BHKW) approx. 50kW - Battery storage
    50kW/20min.
  • PQ Monitoring - SimeasQ (Siemens) or Mavolog
    (GM) - Topas 1000 (LEM)

Source Architektenbüro Pohlmann
27
MVV Pilot Installation Configuration Design
18 x 5 kWp PV
Combined Heat and Power Unit 50 kW
CHP
PV 120 kWp
kWh
kWh
kWh
Transformer 400kVA 20 / 0,4 kV
(optional)
Distribution box
kWh
kWh
Central energy and power quality management PoMS
Battery Storage 50 kW/20min.
30 kWp PV


Communication

28
End
Thank you for your attention
29
Radial 1 and radial 2
  • LV Network in radial configuration
  • radial 1 (rural )
  • radial 2 (urban)

30
Link 1 and 2
  • LV Network in link configuration
  • Link 1 (rural )
  • Link 2 (urban)

31
Ring 1 and 2
  • LV Network in ring configuration
  • ring 1 (rural )
  • ring 2 (urban)

32
Mesheable configuration
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