The IBPSA library is currently missing a PV system model which can be used in the context of building performance simulations.
The intended model will have the following features:

• The model will consist of three sub-models, namely a cell temperature, an I-V-characteristic, and a radiation and absorbance model

• The model's input are the weather bus BoundaryConditions.WeatherData.Bus (DryBulbTemp, wind speed and global horizontal irradiance)

• The model's output is the DCOutputPower as Real Interface

The sub-models have the following characteristics:

1. Cell temperature model

• This model calculates the cell temperature which influences the PV System efficiency based on the ambient temperature, the wind velocity, the I-V-characteristic and the radiation on the tilted surface
• It will comprise 3 different approaches which correspond to the PV mounting, i.e., an open rack, a close to ground and a contact to ground installation. The approaches are based on scientific studies: https://www.osti.gov/servlets/purl/919131sca5ep/ and https://www.wiley.com/en-gb/Solar+Engineering+of+Thermal+Processes,+4th+Edition-p-9780470873663

2. I-V-characteristic

• There are different approaches to calculate the I-V-characteristic. This model will follow the analytical 5-p modeling approach as a compromise between accuracy, simulation robustness, and computational effort. The studies referred to can be found on the following websites:
• https://spiral.imperial.ac.uk/bitstream/10044/1/52942/2/tmp_7424-Batzelis%20-%20A%20method%20for%20the%20analytical%20extraction%20of%20the%20single-diode%20%5Baccepted%5D157975443.pdf and
• https://www.sciencedirect.com/science/article/abs/pii/S0038092X05002410
• The I-V-characteristic uses the radiation on the tilted surface, the cell temperature, and the ratio of absorbed radiation under operating conditions to standard conditions as input

3. Radiation and absorbance model

• Uses total irradiance on horizontal plane as input to calculate the ratio of absorbed radiation under operating conditions to standard conditions and radiation on tilted surface
• Follows assumptions of the following study: https://www.wiley.com/en-gb/Solar+Engineering+of+Thermal+Processes,+4th+Edition-p-9780470873663

What steps are necessary to solve this issue?

• Add package structure Electrical.PVSystems
• Add model Electrical.PVSystems.PVSystem
• Implement example of annual simulation
• Implement model as validation data using NIST measurements
• Add regression tests and Simulate and Plot scripts