HSC Database Documentation

1 Model setup parameters

Model settings parameters are specified in a hsc_Settings.yml file which should be located in the current working directory (or to specify an alternative location, edit the settings_path variable in your Run.jl file). Settings include those related to model structure, solution strategy and outputs, policy constraints, and others. Model structure related settings parameter affects the formulation of the model constraint and objective functions. Computational performance related parameters affect the accuracy of the solution. Policy related parameters specify the policy type and policy goal. Network related parameters specify settings related to transmission network expansion and losses. Note that all settings parameters are case sensitive.

Table 1a: Summary of the Model settings parameters

2 Inputs

All input files are in CSV format. Running the GenX submodule requires a minimum of five input files. Additionally, the user may need to specify five more input files based on model configuration and type of scenarios of interest. Names of the input files and their functionality is given below. Note that names of the input files are case sensitive.

Table 2: Summary of the input files

2.1 Mandatory input data

2.1.2 HSC_pipelines.csv

This input file contains input parameters related to: 1) definition of pipeline network (regions between which pipelines are explicitly modeled and can be constructed) and 2) definition of pipeline construction costs, booster compressors (for pressure losses along the pipe), and main compressors (compression from hydrogen production pressure to desired pipeline pressure). The following table describes each of the mandatory parameter inputs that need to be specified to run an instance of the model, along with comments for the model configurations when they are needed.

Table 3: Structure of the HSC_pipelines.csv file

2.1.3 HSC_load_data.csv

This file includes parameters to characterize model temporal resolution to approximate annual operations, hydrogen demand for each time step for each zone, and cost of load shedding. Note that DOLPHYN is designed to model hourly time steps. With some care and effort, finer (e.g. 15 minute) or courser (e.g. 2 hour) time steps can be modeled so long as all time-related parameters are scaled appropriately (e.g. time period weights, heat rates, ramp rates and minimum up and down times for generators, variable costs, etc).

Table 4: Structure of the HSC_Load_data.csv file

2.1.4 HSC_generator_variability.csv

This file contains the time-series of capacity factors / availability of each resource included in the HSC_generators_data.csv file for each time step (e.g. hour) modeled.

• first column: The first column contains the time index of each row (starting in the second row) from 1 to N.

• Second column onwards: Resources are listed from the second column onward with headers matching each resource name in the HSC_generators_data.csv file in any order. The availability for each resource at each time step is defined as a fraction of installed capacity and should be between 0 and 1.

2.1.5 HSC_generation.csv

This file contains cost and performance parameters for various generators and other resources like hydrogen storage included in the model formulation.

Table 5: Mandatory columns in the HSC_generation.csv file

Table 6: Settings-specific columns in the HSC_generation.csv file

2.2 Optional input data

2.2.1 HSC_CO2_cap.csv

This file contains inputs specifying CO2 emission limits policies (e.g. emissions cap and permit trading programs). This file is needed if H2CO2Cap flag is activated in the YAML file hsc_settings.yml. h2CO2Cap flag set to 1 represents mass-based (tCO2 ) emission target. CO2Cap flag set to 2 is specified when emission target is given in terms of rate (tCO2/tonne-H$_2$) and is based on total demand met. H2CO2Cap flag set to 3 is specified when emission target is given in terms of rate (tCO2 /tonne-H$_2$) and is based on total generation. Note that there is also a global setting available to set one CO2 constraint for both power and hydrogen, in which case the limits in this file can be set to zero.

Table 6: Structure of the HSC_CO2_cap.csv file

2.2.2 HSC_G2P.csv

This file contains cost and performance parameters for various hydrogen to power resources included in the model formulation.

Table 7: Mandatory columns in the HSC_G2P.csv file

Table 8: Settings-specific columns in the HSC_G2P.csv file

2.2.3 HSC_g2p_generators_variability.csv

This file contains the time-series of capacity factors / availability of each resource included in the HSC_G2P.csv file for each time step (e.g. hour) modeled.

• first column: The first column contains the time index of each row (starting in the second row) from 1 to N.

• Second column onwards: Resources are listed from the second column onward with headers matching each resource name in the HSC_generators_data.csv file in any order. The availability for each resource at each time step is defined as a fraction of installed capacity and should be between 0 and 1.

2.2.4 HSC_trucks.csv

This file contains cost and performance parameters for various hydrogen to power resources included in the model formulation.

Table 7: Mandatory columns in the HSC_trucks.csv file

2.2.5 HSC_load_data_liquid.csv

This optional file includes parameters to characterize model temporal resolution to approximate annual operations for hydrogen liquid demand for each time step for each zone, and cost of load shedding. It is to be used when modeling liquid hydrogen.

Table 8: Structure of the HSC_load_data_liquid.csv file

3 Outputs

The table below summarizes the output variables reported as part of the various CSV files produced after each model run. The reported units are also provided. When the model is run with time domain reduction, if a result file includes time-dependent values (e.g. for each model time step), the value will not include the hour weight in it. An annual sum ("AnnualSum") column/row will be provided whenever it is possible (e.g., emissions.csv), and this value takes the time-weights into account.

3.1 Default output files

3.1.1 HSCgenerationstorage_capacity.csv

Reports optimal values of investment variables (except StartCap, which is an input)

Table 9: Structure of the HSCgenerationstorage_capacity.csv file

3.1.2 HSC_emissions.csv

Reports CO2 emissions for each zone and each hour by H$_2$ Resources; an annual sum row will be provided (in tonnes).

3.1.4 HSC_nse.csv

Reports H$_2$ non-served energy for every model zone, time step and cost-segment.

3.1.5 HSCgenerationdischarge.csv

Reports H$_2$ discharged by each H$_2$ production resource (generation, storage) in each model time step, as well as the annual sum (in tonnes).

3.1.6 HSCh2balance.csv

Reports the use (tonnes/hour or tonnes) of each H$_2$ resource type (Generation, Flexible Demand, Storage Charge & Discharge, Nonserved Energy, H$_2$ Pipeline Import/Export, H$_2$ Truck Import/Export, G2P Demand, and Demand) for each zone and each time step, as well as the annual sum.

3.1.7 HSC_costs.csv

Reports HSC costs for each zone, including sum of fixed costs, variable costs, NSE (non-served energy) costs, start-up costs (for generators), network expansion cost of pipelines, and total costs.

3.2 HSC Optional Output Files

3.2.1 HSCg2pcapacity.csv

Reports optimal values of investment variables (except StartCap, which is an input) for each G2P resource.

Table 10: Structure of the HSCg2pcapacity.csv file

3.2.2 HSCG2PH2_consumption.csv

Reports H$_2$ required (in tonnes) by G2P for each zone and each model time step, as well as the annual sum.

3.2.3 HSC_charge.csv

Reports H$_2$ charging (i.e flow in tonnes for each hour) for storage resources for each zone and time step, as well as the annual sum.

3.2.4 HSC_storage.csv

Reports storage level (i.e amount of H$_2$ in tonnes) for storage resources for each zone and time step.

3.2.5 HSCh2pipeline_flow.csv

Reports H$_2$ level (in tonnes/hour) in each pipeline for each time step, as well as the amount of hydrogen (in tonnes) sent from the source or arrived at the sink.

3.2.6 HSCh2pipeline_level.csv

Reports H$_2$ level (in tonnes/hour) in each pipeline for each time step.

3.2.7 TRUCKS

Reports hydrogen transmission trucks related variables in h2_truck_capacity.csv and other outputs in several subfolders including

• H2TruckTransit: recording different truck transition status of arrive, depart and travel according to types
• H2TruckFlow: recording hydrogen flow according to types
• H2TruckNumber: recording the number of different truck states of full and empty according to types
• H2TruckState: recording the different truck states of available full and available empty and charged or discharged at each zone

3.2.7.1 H2 Truck Capacity

This file reports truck capacity and related compression capacity. The columns are separated by different truck types and ended with a total column recording total capacity over different types of trucks.

Table 11: Structure of the h2truckcapacity.csv file

3.2.7.2 H2TruckTransit Folder

This folder contains output files reporting variables of different transition statuses (arrive, depart and travel) in combination with loading statuses (full and empty). Each file is named after the pattern like H2Truck{transition}{loading}.csv like H2TruckArriveFull.csv reports total number of arriving trucks. The columns are separated by truck types and indexed with time steps. Other files have the same logic of reporting outputs.

3.2.7.3 H2TruckFlow Folder

This folder contains output files reporting variables of hydrogen flow through different types of trucks. Each file is named after the pattern like H2TruckFlow{type}.csv like H2TruckFlowGas.csv. H2TruckFlow_Gas.csv reports hydrogen flow through different types of hydrogen trucks. The columns are separated by zones and indexed with time steps. Other files have the same logic of reporting outputs.

3.2.7.4 H2TruckNumber Folder

This folder contains output files reporting variables of total hydrogen truck number in different loading statuses. Each file is named after the pattern like H2TruckNumber{loading}.csv like H2TruckNumberFull.csv. The columns are separated by different truck types and indexed with time steps. Other files have the same logic of reporting outputs.

3.2.7.5 H2TruckState Folder

This folder contains output files reporting variables of total hydrogen truck state in different statuses. Each file is named after the pattern like H2Truck{state}.csv. Candidate states are in AvailEmpty, AvailFull, Charged and Discharged. The columns are separated by combination of zones and different truck types and indexed with time steps. Other files have the same logic of reporting outputs.