CLEWS Summer School ICTP Trieste Italy 13 June 2017 Time representation Longterm energy system models Span a large time horizon eg 2015 2050 Consider a large set of technologies ID: 757285
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Slide1
Basics of energy modelling III: Time representation and considerations
CLEWS Summer School,
ICTP (Trieste), Italy,
13 June, 2017Slide2
Time representation
Long-term energy system models:
Span a large time horizon (e.g. 2015 – 2050)
Consider a large set of technologies
Span a large geographical region (e.g. USA, Africa, Europe, China)
Need to capture temporal variations:
Variability of supply (e.g. wind, solar, hydro)
Variability of demand (e.g. seasonal, monthly, weekly, daily)
Peak load requirements
Trade-off between level of detail and computational costSlide3
What are Time Slices?
Each year divided into representative time periods known as Time Slices:
(Summer-Winter-Intermediate) x (Day-Night) = 6 Time Slices
(Jan-Feb-Mar-…-Dec) x (Weekday-Weekend) x (Day-Night) = 48 Time Slices
(365 days) x (24 hours) = 8760 Time Slices
Number of Time Slices in OSeMOSYS is practically unlimitedTime Slice definition is consistently applied for the entire model
0
8760
Electricity
demand
Water resourcesSlide4
Example of Time Slice definition
2017
2050
Model horizon
Source: R
.
Loulou
, U.
Remne
, A.
Kanudia
, A.
Lehtila
, and G. Goldstein. Documentation for the TIMES model: Part
I
. ETSAP, April
2005
Annual
Seasonal
Weekly
DailySlide5
Time Slice-related parameters
Year Split
: Duration of each Time Slice as a fraction
of a
year
Capacity Factor: Fraction of a technology’s capacity that can be utilized in each Time SliceSpecified Annual Demand*: Fraction of annual demand for a commodity in a each Time Slice*Accumulated Annual Demand: Total annual demand for a commodity. Can be balanced in any Time Slice.Slide6
Time Slice Definition (
Example
of
Bolivia)Slide7
Time Slice Definition
(
Example
cont
.)Year divided in four Seasons
Season 1:
1
st January to 30th
AprilSeason 2: 1
st May to 31st AugustSeason 3: 1st September to 30th NovemberSeason 4: 1
st December to 31st DecemberSlide8
Time Slice Definition (
Example
cont
.
)Season 1
Season 2Slide9
Time Slice Definition (
Example
cont
.)
Season 3
Season 4Slide10
Time Slice Definition:
Exercise
1
01:00-07:00
07:00-18:00
18:00-22:00
22:00-01:00
Seasons
6 hours
11 hours
4 hours3 hoursSeason 1 (Jan-Apr)
????Season 2 (May-Aug)
?
?
?
?Season 3 (Sep-Nov)
?
??
?Season 4 (Dec)
??
??Slide11
Time Slice Definition:
Exercise
1
Time (duration)
01:00-07:00
07:00-18:00
18:00-22:00
22:00-01:00
6 hours
11 hours
4 hours
3 hoursTotal = 24 hoursSeason 1 (Jan-Apr)120 days0.082190.15068
0.05479
0.04110
Season 2 (May-Aug)
123 days0.08425
0.154450.056160.04212
Season 3 (Sep-Nov)91 days
0.062330.11427
0.041550.03116
Season 4 (Dec)31 days
0.021230.038930.01416
0.01062
Total = 365 days
Total = 8760 hoursSlide12
Exercise 2: Earlier example, with TimeSlices
YearSplit
Day
Night
6:00-18:00
18:00-6:00
12 hours
12 hours
Summer
4 months
0.1667
0.1667Winter4 months0.16670.1667Intermediate
4 months
0.1667
0.1667
SpecifiedDemandProfile
Day
Night
7:00-19:0019:00-7:00
12 hours
12 hoursSummer 4 months
0.150.05
Winter4 months0.5
0.1Intermediate4 months
0.150.05
NOTE: ‘SpecifiedAnnualDemand’ instead of ‘AccumulatedAnnualDemand’Slide13
Exercise 2: Earlier example, with TimeSlices Slide14
Exercise 2: YearSplitSlide15
Exercise 2: SpecifiedAnnualDemandSlide16
Exercise 2: SpecifiedDemandProfileSlide17
Exercise 2: DemandSlide18
Exercise 2: ResultsSlide19
Exercise 2: Results