analysis of solar power plant

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akshata
analysis of solar power plant

I have done the simulation of plant taking "mundargi" region as a reference. for the average GHI of 5.77 kwh/square m/day , yearly production which i got from SAM software is 1778,619 kwh. But when i took another region " vijayapur" with average irradiance of 5.83 kWh/ square.m/day, come up with result of 1630,319 kWh. Hence in general for more value of irradiance, should get more output energy value. where as this a different and opposite case. please help me to get solution. Thank you

Paul Gilman

The answer to your question depends on what kind of system you are modeling (and which performance model you are using in SAM), and what input parameters you are changing along with the weather file. It also depends on how the solar resource is distributed over the day and year. The annual daily average irradiance is only one indication of the solar resource.

Best regards,
Paul.

akshata

Sir, in SAM software, while computing the energy production, why will it consider the ' PTC ' instead of ' STC' in pv module parameter selection. please help me with this. thank you

akshata

I have considered the real time power plant which gives production of 1893.402 MWh. but when i considered same manufacturing companies like for module, Talesun and for inverter ABB, with similar ratings as that of real time and computed using SAM, i came up with result of 1778.619. so what could be the reason?
Thank you

akshata

Sir, i have done simulation with multicrystalline and monocrystalline. The result for multicrystalline is more compared to monocrystalline. But in usual case efficiency of monocrystalline is more than polycrystalline. what could be the reason for this ? ( all parameters are kept same, only multicrystalline is changed to monocrystalline with different manufacturing companies )

Paul Gilman

SAM's photovoltaic models assume that the module design parameters are at Standard Test Conditions (STC).

Best regards,
Paul.

Paul Gilman

There are several factors that might cause SAM's results to be different from measured data from a real system. For example, the weather data you use for SAM's simulation should represent the same conditions under which the real system operated. Also, you should make sure that the shading and loss assumptions in SAM are consistent with how the real system operates. And, you should be careful that the module, inverter, and system design parameters in SAM are the same as those for the real system.

You might find these photovoltaic system case study reports to be helpful:

https://sam.nrel.gov/case-studies

Best regards,
Paul.

Paul Gilman

When you change the module parameters to compare different cell types, you should be sure to take into account the nominal capacities of the different modules. There are factors of a module's design other than the cell type that affect its efficiency. For example the module cover might affect the module efficiency.

SAM reports the energy yield metric and module efficiencies in each simulation time step that might be useful for this kind of comparison.

Best regards,
Paul.

akshata

Photovoltaic system case study reports are very much helpfull for my studies. Thank you sir.

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