14-06-2016, 06:22 PM
Ok, here are some additional details:
If we assume that the inflow is evenly distributed over the daily hours, we can immediately calculate the pondage storage capacity from the constraints that 1) the plant can run at full capacity for at most 6 consecutive hours every day, and 2) the daily load factor is at most 40%. The storage size can be then calculated as 6/24–0.4*6/24 = 0.15 of the nominal daily maximum production (2400 MWh), i.e. 0.15*2400 = 360 MWh. The figure below illustrates an example production pattern fitting the two constraints:
As you can see, the maximum number of consecutive full load hours is 6, and the daily load factor is 40%, just as required.
The three horizontal lines shown in this figure represent the operational constraints: The topmost line is the storage capacity (=3.6), the blue line is the plant output capacity (=1), and the lowest line is the assumed even inflow distribution (=0.4).
With TIMES v3.9.5, these three constraints can be modelled by specifying the following parameters:
PARAMETER NCAP_AFC /
CH.0.PROR-1.ACT.DAYNITE -1
CH.2010.PROR-1.RORIN.DAYNITE 0.4
CH.2010.PROR-1.ELECTRICITY.DAYNITE 1
/;
PARAMETER NCAP_AF /
CH.2010.PROR-1.ANNUAL.UP 0.15
/;
Here, PROR-1 is name of the process, and RORIN is the input flow (inflow). The process is a DAYNITE level timeslice storage process, with input RORIN, output ELECTRICITY, and PG=ELECTRICITY.
If we assume that the inflow is evenly distributed over the daily hours, we can immediately calculate the pondage storage capacity from the constraints that 1) the plant can run at full capacity for at most 6 consecutive hours every day, and 2) the daily load factor is at most 40%. The storage size can be then calculated as 6/24–0.4*6/24 = 0.15 of the nominal daily maximum production (2400 MWh), i.e. 0.15*2400 = 360 MWh. The figure below illustrates an example production pattern fitting the two constraints:
As you can see, the maximum number of consecutive full load hours is 6, and the daily load factor is 40%, just as required.
The three horizontal lines shown in this figure represent the operational constraints: The topmost line is the storage capacity (=3.6), the blue line is the plant output capacity (=1), and the lowest line is the assumed even inflow distribution (=0.4).
With TIMES v3.9.5, these three constraints can be modelled by specifying the following parameters:
PARAMETER NCAP_AFC /
CH.0.PROR-1.ACT.DAYNITE -1
CH.2010.PROR-1.RORIN.DAYNITE 0.4
CH.2010.PROR-1.ELECTRICITY.DAYNITE 1
/;
PARAMETER NCAP_AF /
CH.2010.PROR-1.ANNUAL.UP 0.15
/;
Here, PROR-1 is name of the process, and RORIN is the input flow (inflow). The process is a DAYNITE level timeslice storage process, with input RORIN, output ELECTRICITY, and PG=ELECTRICITY.