Inverter Temperature Derate based on Pmax ratio #471
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than inv. efficiency
mjprilliman
commented
Oct 27, 2020
temp derate test results in pvsamv1
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See also NREL/SAM#412 |
dguittet
reviewed
Oct 30, 2020
shared/lib_shared_inverter.cpp
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| for (size_t i = 0; i < DCStringVoltage.size(); i++) | ||
| avgDCVoltage += DCStringVoltage[i]; | ||
| avgDCVoltage /= DCStringVoltage.size(); | ||
| calculateTempDerate(avgDCVoltage, tempC, powerAC_Watts, power_ratio, tempLoss); |
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tempLoss will now be in DC. So any comments and the var_info table label should specify that
shared/lib_shared_inverter.cpp
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| } | ||
| double power_ratio = 1.0; | ||
| if (m_tempEnabled) { | ||
| calculateTempDerate(DCStringVoltage, tempC, powerAC_Watts, power_ratio, tempLoss); |
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Since this code is now working to potentially clip the input DC power, this should be done before the calls to acpower.
…to inv_temp_derate_pmax
clipping comparison for thermal derate, updated tests and documentation
mjprilliman
commented
Nov 2, 2020
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@dguittet Need input on how to handle PVYield inverter derate
| double startT2 = 0.0; | ||
| double Vdc2 = 0.0; | ||
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| double p_dc_max = getInverterDCMaxPower(p_dc_rated); |
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Added function to get rated DC power from inverter.
dguittet
reviewed
Nov 2, 2020
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-Changed inverter derate table to be based on ratio of max output power to rated power rather than efficiency
-Update Y-axis label to reflect the ratio rather than the percentage
-Update default inverter temperature derate table to reflect more realistic examples (resource provided by Will Hobbs from Southern Company: https://files.sma.de/downloads/Temp-Derating-TI-en-15.pdf)
-Closes #442