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add electricity purchases operating expense for heat models
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@tyneises
tyneises committed Oct 8, 2023
1 parent 4ffbf3c commit 0d5b825
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Showing 2 changed files with 33 additions and 5 deletions.
34 changes: 29 additions & 5 deletions ssc/cmod_singleowner.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -55,10 +55,13 @@ static var_info _cm_vtab_singleowner[] = {


{ SSC_INPUT, SSC_ARRAY, "gen", "Net power to or from the grid", "kW", "", "System Output", "*", "", "" },
{ SSC_INPUT, SSC_ARRAY, "gen_without_battery", "Electricity to or from the renewable system, without the battery", "kW", "", "System Output", "", "", "" },
{ SSC_INPUT, SSC_ARRAY, "gen_without_battery", "Electricity to or from the renewable system, without the battery", "kW", "", "System Output", "", "", "" },

{ SSC_INPUT, SSC_ARRAY, "degradation", "Annual energy degradation", "", "", "System Output", "system_use_lifetime_output=0", "", "" },
{ SSC_INPUT, SSC_NUMBER, "system_capacity", "System nameplate capacity", "kW", "", "System Output", "?=0", "", "" },

{ SSC_INPUT, SSC_NUMBER, "annual_electricity_consumption", "Annual electricity consumption w/ avail derate", "kWe-hr", "", "Heat Model Output", "?=0", "", ""},

{ SSC_INPUT, SSC_ARRAY, "degradation", "Annual energy degradation", "", "", "System Output", "system_use_lifetime_output=0", "", "" },
{ SSC_INPUT, SSC_NUMBER, "system_capacity", "System nameplate capacity", "kW", "", "System Output", "?=0", "", "" },

/* PPA Buy Rate values */
{ SSC_INPUT, SSC_ARRAY, "utility_bill_w_sys", "Electricity bill with system", "$", "", "Utility Bill", "", "", "" },
Expand Down Expand Up @@ -539,7 +542,10 @@ static var_info _cm_vtab_singleowner[] = {
{ SSC_OUTPUT, SSC_ARRAY, "cf_om_production2_expense", "O&M fuel cell production-based expense", "$", "", "Cash Flow Expenses", "", "LENGTH_EQUAL=cf_length", "" },
{ SSC_OUTPUT, SSC_ARRAY, "cf_om_capacity2_expense", "O&M fuel cell capacity-based expense", "$", "", "Cash Flow Expenses", "", "LENGTH_EQUAL=cf_length", "" },
{ SSC_OUTPUT, SSC_ARRAY, "cf_om_fuel_expense", "Fuel expense", "$", "", "Cash Flow Expenses", "*", "LENGTH_EQUAL=cf_length", "" },
{ SSC_OUTPUT, SSC_ARRAY, "cf_om_opt_fuel_1_expense", "Feedstock biomass expense", "$", "", "Cash Flow Expenses", "*", "LENGTH_EQUAL=cf_length", "" },

{ SSC_OUTPUT, SSC_ARRAY, "cf_om_elec_price_for_heat_techs", "Electricity expense in heat models", "$", "", "Cash Flow Expenses", "*", "LENGTH_EQUAL=cf_length", "" },

{ SSC_OUTPUT, SSC_ARRAY, "cf_om_opt_fuel_1_expense", "Feedstock biomass expense", "$", "", "Cash Flow Expenses", "*", "LENGTH_EQUAL=cf_length", "" },
{ SSC_OUTPUT, SSC_ARRAY, "cf_om_opt_fuel_2_expense", "Feedstock coal expense", "$", "", "Cash Flow Expenses", "*", "LENGTH_EQUAL=cf_length", "" },

{ SSC_OUTPUT, SSC_ARRAY, "cf_property_tax_assessed_value", "Property tax net assessed value", "$", "", "Cash Flow Expenses", "*", "LENGTH_EQUAL=cf_length", "" },
Expand Down Expand Up @@ -685,6 +691,7 @@ enum {
CF_om_production2_expense,
CF_om_capacity2_expense,
CF_om_fuel_expense,
CF_om_elec_price_for_heat_techs,

CF_om_opt_fuel_2_expense,
CF_om_opt_fuel_1_expense,
Expand Down Expand Up @@ -855,6 +862,8 @@ enum {
CF_energy_sales,
CF_energy_purchases,

CF_elec_purchases_for_heat_techs,

CF_energy_without_battery,

CF_battery_discharged,
Expand Down Expand Up @@ -999,6 +1008,8 @@ class cm_singleowner : public compute_module
// In conjunction with SAM - take installed costs and salestax costs (for deducting if necessary)
double cost_prefinancing = as_double("total_installed_cost");

double annual_electricity_consumption_heat_model = as_double("annual_electricity_consumption");

// use named range names for variables whenever possible
double nameplate = as_double("system_capacity");
double year1_fuel_use = as_double("annual_fuel_usage"); // kWht
Expand Down Expand Up @@ -1045,6 +1056,8 @@ class cm_singleowner : public compute_module
escal_or_annual( CF_om_capacity_expense, nyears, "om_capacity", inflation_rate, 1.0, false, as_double("om_capacity_escal")*0.01 );
escal_or_annual( CF_om_fuel_expense, nyears, "om_fuel_cost", inflation_rate, as_double("system_heat_rate")*0.001, false, as_double("om_fuel_cost_escal")*0.01 );

escal_or_annual(CF_om_elec_price_for_heat_techs, nyears, "om_elec_price_for_heat_techs", inflation_rate, 1.0, false, as_double("om_elec_price_for_heat_techs_escal")*0.01 );

escal_or_annual( CF_om_opt_fuel_1_expense, nyears, "om_opt_fuel_1_cost", inflation_rate, 1.0, false, as_double("om_opt_fuel_1_cost_escal")*0.01 );
escal_or_annual( CF_om_opt_fuel_2_expense, nyears, "om_opt_fuel_2_cost", inflation_rate, 1.0, false, as_double("om_opt_fuel_2_cost_escal")*0.01 );

Expand Down Expand Up @@ -1181,6 +1194,7 @@ class cm_singleowner : public compute_module
double first_year_energy = 0.0;
double first_year_sales = 0.0;
double first_year_purchases = 0.0;
double first_year_elec_purchases_for_heat_techs = as_double("annual_electricity_consumption"); //[kWe-hr]


// degradation
Expand Down Expand Up @@ -1211,6 +1225,9 @@ class cm_singleowner : public compute_module
// dispatch
if (as_integer("system_use_lifetime_output") == 1)
{
if (first_year_elec_purchases_for_heat_techs > 0.0)
throw exec_error("singleowner", "system_use_lifetime_output must be 0 if using electricity purchases for heat technologies option");

// hourly_enet includes all curtailment, availability
for (size_t y = 1; y <= (size_t)nyears; y++)
{
Expand All @@ -1232,10 +1249,12 @@ class cm_singleowner : public compute_module
cf.at(CF_energy_net, 1) = first_year_energy;
cf.at(CF_energy_sales, 1) = first_year_sales;
cf.at(CF_energy_purchases, 1) = first_year_purchases;
cf.at(CF_elec_purchases_for_heat_techs, 1) = first_year_elec_purchases_for_heat_techs;
for (i = 1; i <= nyears; i++) {
cf.at(CF_energy_net, i) = first_year_energy * cf.at(CF_degradation, i);
cf.at(CF_energy_sales, i) = first_year_sales * cf.at(CF_degradation, i);
cf.at(CF_energy_purchases, i) = first_year_purchases * cf.at(CF_degradation, i);
cf.at(CF_elec_purchases_for_heat_techs, i) = first_year_elec_purchases_for_heat_techs * cf.at(CF_degradation, i);
}

}
Expand Down Expand Up @@ -1390,6 +1409,8 @@ class cm_singleowner : public compute_module
cf.at(CF_om_capacity2_expense, i) *= nameplate2;
cf.at(CF_om_fuel_expense,i) *= fuel_use[i];

cf.at(CF_om_elec_price_for_heat_techs, i) *= cf.at(CF_elec_purchases_for_heat_techs, i);

//Battery Production OM Costs
cf.at(CF_om_production1_expense, i) *= battery_discharged[i - 1]; //$/MWh * 0.001 MWh/kWh * kWh = $
cf.at(CF_om_production2_expense, i) *= fuelcell_discharged[i];
Expand Down Expand Up @@ -1603,6 +1624,7 @@ class cm_singleowner : public compute_module
+ cf.at(CF_om_production2_expense, i)
+ cf.at(CF_om_capacity2_expense, i)
+ cf.at(CF_om_fuel_expense, i)
+ cf.at(CF_om_elec_price_for_heat_techs, i)
+ cf.at(CF_om_opt_fuel_1_expense, i)
+ cf.at(CF_om_opt_fuel_2_expense, i)
+ cf.at(CF_land_lease_expense, i)
Expand Down Expand Up @@ -3434,6 +3456,7 @@ class cm_singleowner : public compute_module
}

save_cf( CF_om_fuel_expense, nyears, "cf_om_fuel_expense" );
save_cf( CF_om_elec_price_for_heat_techs, nyears, "cf_om_elec_price_for_heat_techs");
save_cf( CF_om_opt_fuel_1_expense, nyears, "cf_om_opt_fuel_1_expense" );
save_cf( CF_om_opt_fuel_2_expense, nyears, "cf_om_opt_fuel_2_expense" );
save_cf(CF_land_lease_expense, nyears, "cf_land_lease_expense");
Expand Down Expand Up @@ -3858,11 +3881,12 @@ class cm_singleowner : public compute_module
double pvFixedOandM = npv(CF_om_capacity_expense, nyears, nom_discount_rate);
double pvVariableOandM = npv(CF_om_production_expense, nyears, nom_discount_rate);
double pvFuelOandM = npv(CF_om_fuel_expense, nyears, nom_discount_rate);
double pvElec_price_for_heat_techs = npv(CF_om_elec_price_for_heat_techs, nyears, nom_discount_rate);
double pvOptFuel1OandM = npv(CF_om_opt_fuel_1_expense, nyears, nom_discount_rate);
double pvOptFuel2OandM = npv(CF_om_opt_fuel_2_expense, nyears, nom_discount_rate);
// double pvWaterOandM = NetPresentValue(sv[svNominalDiscountRate], cf[cfAnnualWaterCost], analysis_period);

assign( "present_value_oandm", var_data((ssc_number_t)(pvAnnualOandM + pvFixedOandM + pvVariableOandM + pvFuelOandM))); // + pvWaterOandM);
assign( "present_value_oandm", var_data((ssc_number_t)(pvAnnualOandM + pvFixedOandM + pvVariableOandM + pvFuelOandM + pvElec_price_for_heat_techs))); // + pvWaterOandM);

assign( "present_value_oandm_nonfuel", var_data((ssc_number_t)(pvAnnualOandM + pvFixedOandM + pvVariableOandM)));
assign( "present_value_fuel", var_data((ssc_number_t)(pvFuelOandM + pvOptFuel1OandM + pvOptFuel2OandM)));
Expand Down
4 changes: 4 additions & 0 deletions ssc/common.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -113,6 +113,10 @@ var_info vtab_oandm[] = {
{ SSC_INPUT, SSC_NUMBER, "annual_fuel_usage", "Fuel usage (yr 1)", "kWht", "", "System Costs", "?=0", "MIN=0", "" },
{ SSC_INPUT, SSC_ARRAY, "annual_fuel_usage_lifetime", "Fuel usage (lifetime)", "kWht", "", "System Costs", "", "", "" },

{ SSC_INPUT, SSC_ARRAY, "om_elec_price_for_heat_techs", "Electricity price for purchases in heat model", "$/kWh", "", "System Costs", "?=0.0", "", "" },
{ SSC_INPUT, SSC_NUMBER, "om_elec_price_for_heat_techs_escal", "Escalation for electricity price for purchases in heat model", "%/year", "", "System Costs", "?=0.0", "", "" },


// replacements
{ SSC_INPUT,SSC_ARRAY , "om_batt_replacement_cost" , "Replacement cost 1" , "$/kWh" , "" , "System Costs" , "?=0.0" , "" , ""},
{ SSC_INPUT,SSC_ARRAY , "om_fuelcell_replacement_cost" , "Replacement cost 2" , "$/kW" , "" , "System Costs" , "?=0.0" , "" , ""},
Expand Down

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