| Abstract [eng] |
The inverters and photovoltaic modules of a solar power plant, like all appliances, are tested by the manufacturers themselves in a controlled environment with specified environmental conditions. If the appliances pass the test, they are allowed to be used by the customer. That being said, both the inverters and the photovoltaic modules are used in conditions very different than they are made to be used in. As such, their performance can differ than stated by the manufacturer. Photovoltaic modules are the best example of this, as thei are tested in such an environment, that their temperature does not exceed 25 0C , while in reality it can exceed 35 degrees and more and result in lower power output. Also, due to the fact that photovoltaic modules are installed outdoors, they are subject to not only solar irradiation but wind as well, which helps cool down the modules and keep the power output closer to the one specified by the manufacturer. Inverters, which are designed to transform direct current into alternating current also have their own specific technical parameters, of which efficiency is by far the most important. Typically, manufacturers state that inverters have only a slight efficiency drop comparing performance in low power and high power scenarios, but, due to changes in temperature, windspeed and other environmental factors, the resulting efficiency is lower than stated. By exploring the effect of these environmental factors on the photovoltaic modules and inverters, it is possible to better calculate the return of investment period of the solar power plant, find a more suitable site for the powerplant and other important technical challenges that decide the success of the project. |
