Common fault causes and solutions for distributed photovoltaic power plants (1)
Chapter 1 Factors Affecting Power Generation of Photovoltaic Power Stations
Photovoltaic power generation calculation method, theoretical annual power generation = annual average solar radiation total * total battery area * photoelectric conversion efficiency. However, due to various factors, the power generation of photovoltaic power plants is actually not so much. The actual annual power generation = theoretical annual power generation * actual power generation efficiency. So what are the factors that affect the power generation of photovoltaic power plants? The following is my basic design and construction experience, to tell you some basic knowledge of distributed power generation.
About the author: Liu Jimao, salesman of Shenzhen Jingfuyuan Marketing Department, graduate student of Power Electronics of Harbin Institute of Technology. In 1994, he began to work on equipment maintenance and design. In 2008, he began to work on inverter research and development and photovoltaic system design. Researched the operation of more than 100 photovoltaic power plants at home and abroad, designed more than 1000 grid-connected and off-grid systems, and has a unique understanding of equipment selection, reliability design, operation and maintenance. For more details, please refer to the author's store: http://shop58660964.taobao.com/.
1.1, the amount of solar radiation
A solar cell module is a device that converts solar energy into electrical energy, and the intensity of the light radiation directly affects the amount of power generated. Solar radiation data for each region can be obtained through the NASA Meteorological Data Query website or by PV design software such as PV-SYS or RETScreen.
1.2, the tilt angle of the solar cell module
The data obtained from the weather station is generally the amount of solar radiation on the horizontal plane, which is converted into the radiation amount of the inclined surface of the photovoltaic array to calculate the power generation of the photovoltaic system. The optimum tilt angle is related to the latitude of the project location. The approximate experience values ​​are as follows:
A, latitude 0 ° ~ 25 °, the inclination angle is equal to the latitude
B, latitude 26 ° ~ 40 °, inclination equal to latitude plus 5 ° ~ 10 °
C, latitude 41 ° ~ 55 °, inclination equal to latitude plus 10 ° ~ 15 °
1.3, solar cell module conversion efficiency
1.4. System Loss As with all products, in the life cycle of photovoltaic power plants for 25 years, the efficiency of components and the performance of electrical components will gradually decrease, and the amount of power generation will decrease year by year. In addition to these natural aging factors, there are many factors such as component, inverter quality problems, circuit layout, dust, series-parallel loss, cable loss and so on.
In the financial model of a typical PV power plant, the system's power generation is reduced by about 5% in three years, and the power generation is reduced to 80% after 20 years.
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