integrated operation of an energy microgrid with islanded electricity network
DESCRIPTION
INTEGRATED OPERATION OF AN ENERGY MICROGRID WITH ISLANDED ELECTRICITY NETWORK. B. Awad, J. Wu, J. Ekanayake and N. Jenkins Centre for Integrated Renewable Energy Generation and Supply, Cardiff University. Background. The energy policy of the UK - PowerPoint PPT PresentationTRANSCRIPT
INTEGRATED OPERATION OF AN ENERGY MICROGRID WITH ISLANDED ELECTRICITY
NETWORK
B. Awad, J. Wu, J. Ekanayake and N. Jenkins
Centre for Integrated Renewable Energy Generation and Supply,
Cardiff University
Frankfurt (Germany), 6-9 June 2011
The energy policy of the UK
Renewables, MicroGeneration, CHPs, and District heating
Community energy systems and Energy MicroGrids
AWAD–UK–RIFS4–0344
BackgroundBlueElectric Power NetworkRedDistrict Heat Network
Bus1
N1N2
N3
N4
N5
N6
N7
N8
Bus2
Bus3
Bus4
Bus5
Bus6
Bus7
Bus8
Bus9
Bus10
Bus11
Bus12
Bus13
Bus14
District Heat Station
Apa
rtm
ent B
uild
ing
57kV
A 0
.85
pf
Single Residential Consumer
5.7kVA 0.85 pf
FlyWheel30kW
Mic
roT
urbi
ne30
kW
Imm
ersi
on H
eate
r
Pum
p
Single Residential Consumer
5.7kVA 0.85 pf
Apartment Building25kVA 0.85 pf
Group of Four Residences
25kVA 0.85 pf
Fuel Cell10kW
Photovoltaic3kW
Photovoltaic10kW
Photovoltaic10kW
Wind Turbine10kW
72.8kW
8kW
32kW
39.2kW
8kW
20/0.4kV Transformer±5%, ±2.5%
Grid Connection
Frankfurt (Germany), 6-9 June 2011
An electricity MicroGrid
A District Heating System.
Interconnected at the CHP Unit
Both serve the same group of consumers.
Generation/demand balancing is a challenge
AWAD–UK–RIFS4–0344
Energy MicroGridBlueElectric Power NetworkRedDistrict Heat Network
Bus1
N1N2
N3
N4
N5
N6
N7
N8
Bus2
Bus3
Bus4
Bus5
Bus6
Bus7
Bus8
Bus9
Bus10
Bus11
Bus12
Bus13
Bus14
District Heat Station
Apa
rtm
ent B
uild
ing
57kV
A 0
.85
pf
Single Residential Consumer
5.7kVA 0.85 pf
FlyWheel30kW
Mic
roT
urbi
ne30
kW
Imm
ersi
on H
eate
r
Pum
p
Single Residential Consumer
5.7kVA 0.85 pf
Apartment Building25kVA 0.85 pf
Group of Four Residences
25kVA 0.85 pf
Fuel Cell10kW
Photovoltaic3kW
Photovoltaic10kW
Photovoltaic10kW
Wind Turbine10kW
72.8kW
8kW
32kW
39.2kW
8kW
20/0.4kV Transformer±5%, ±2.5%
Grid Connection
Frankfurt (Germany), 6-9 June 2011
Should heat and electricity networks of the Energy MicroGrid be operated as an integrated system or as two independent systems?
Study tool: The Integrated Optimal Power Flow
Non-Integrated Operation Integrated Operation
CHP Unit Supply Temperature Constant Variable
Heat-to-Power ratio (function of the supply temperature)
Constant Variable
Load following Heat driven Flexible
Electricity to heat conversion Not available Available
Thermal storage Not available Available
AWAD–UK–RIFS4–0344
Operation of the Energy MicroGrid
Frankfurt (Germany), 6-9 June 2011
Case Study
24 hours study period
Islanded electricity network
IOPF used to produce optimal schedules
Integrated operation minimises the need to shed loads and to curtail generation
AWAD–UK–RIFS4–0344
0
20
40
60
80
100
120
00:00:00 03:00:00 06:00:00 09:00:00 12:00:00 15:00:00 18:00:00 21:00:00
Hour
Po
wer
(kW
)
MicroSources Renewables CHPMicroSources Non-Renewables Load sheddingAvailable Renewable Generation Available CHP GenerationAvailable Non-Renewable Generation
0
20
40
60
80
100
120
00:00:00 06:00:00 12:00:00 18:00:00
Hour
Po
wer
(kW
)
MicroSources Renewables CHPMicroSources Non-Renewables Load sheddingAvailable Renewable Generation Available CHP GenerationAvailable Non-Renewable Generation
Generation curtailed
Demand shed
Frankfurt (Germany), 6-9 June 2011
Conclusion
Energy MicroGrids
Integrated vs. Non-Integrated Operation
Integrated Optimal Power Flow for Heat and Electricity
Advantages of the Integrated Operation
AWAD–UK–RIFS4–0344
District Heating Station Consumer
Ts
TR
Valve
Radiator
(Heat Exchanger)m
PLoad