Your photovoltaic power plant has less revenue, it may be that these points have not been done!
In recent years, the country has strongly supported distributed photovoltaics. Distributed photovoltaic power generation has gradually entered people's daily lives. In the field of photovoltaic power plants, the operation, maintenance, and custody services of power plants will become The main theme of the photovoltaic power plant.
The operation efficiency and effect of the power station will directly affect the operation stability and power generation of the photovoltaic power station. For owners who plan to hold photovoltaic power plants for a long time, it is very important and urgent to maximize the use efficiency of photovoltaic power plants!
But after the station is built, you will find that in the same area, the revenue of photovoltaic power plants varies, what factors affect the normal power generation of the power station?
Today, the editor summarizes the following reasons for everyone. I hope everyone can maximize the benefits of their own photovoltaic modules in daily cleaning and maintenance!
1. Ash accumulation of photovoltaic panels
For the long-running photovoltaic power generation system, the impact of dust accumulation on the panel cannot be underestimated. The dust on the surface of the panel has the functions of reflection, scattering and absorption of solar radiation, which can reduce the transmittance of the sun, resulting in the reduction of the solar radiation received by the panel and the reduction of the output power, which is proportional to the cumulative thickness of the dust.
In addition, because the dust absorbs solar radiation, the photovoltaic panel can heat up, and the dust contains some corrosive chemical components, which also reduces its photoelectric conversion efficiency.
Figure: A is cleaned monthly under the same conditions, B is the opposite
The results obtained show that during periods of low rain, due to the accumulated dirt on the panel surface, the battery efficiency loss can reach more than 15%. The dirt and dust on the panel surface can reduce the average annual power generation efficiency by 6%. In general, dust and dirt in the air include: dust, rain, and pollutants, and their presence will cause a reduction in battery output energy. Because dust particles have a greater influence on the forward scattering of sunlight, the current loss of such centralized modules is usually much higher than that of non-centralized modules.
Figure: Power attenuation of photovoltaic systems affected by dust
At the same time, other parts of the photovoltaic panel will also be corroded by wet dust, such as joints, brackets and other parts, the materials are mostly all kinds of metals, corrosion may easily lead to damage, reduced safety and other problems, may be due to strong winds, earthquakes, etc. Natural factors have been destroyed to reduce the service life of photovoltaic panels.
2. The photovoltaic module is blocked by the shadow
Shadowing is the most taboo issue of photovoltaic power plants. Design and installation should pay attention, and later operation and maintenance should pay more attention. Common shadows are mainly bird droppings, dust, shade, buildings, fallen leaves, etc ...
Therefore, first of all, you need to do a good job in landmark surveys. You can choose a suitable location to install photovoltaic components. Try not to install components in sheltered areas. In the unavoidable situation, choose a suitable component placement method to reduce shadows caused by occlusion. Impact. In the daily operation and maintenance process, it is necessary to pay more attention to the cleaning of photovoltaic modules and timely clean up foreign objects such as dust accumulation.
According to statistics, shadow occlusion brings 10 ~ 30% power loss to the system, so the shadow of the components must not be !!!
3. Hot spot loss of photovoltaic modules
Speaking of the hot spot effect, many people are puzzled ... But the problem hidden in it, causing the bad effects of the lack of benefit of photovoltaic modules should not be underestimated!
What is the "hot spot effect"? Under certain conditions, a shaded solar cell module in a series branch will be used as a load to consume the energy generated by other illuminated solar cell modules. The shaded solar cell module will generate heat at this time, which is the hot spot effect.
The hot spot effect severely damages the solar cell itself to a certain extent, and part of the energy generated by the solar cell with light may be consumed by the shaded battery. In addition, long-term untimely cleaning has a great impact on the service life of photovoltaic modules, and serious situations are also the source of fire. The hot spot effect of photovoltaic power plants will directly reduce the service life of photovoltaic modules by 30%. In the long run, it may cause module failure.
Since a photovoltaic person has installed a photovoltaic power station, it is essential to develop scientific operation and maintenance habits and master scientific operation and maintenance methods. In response to the above common problems of photovoltaic power plants, the small box will of course let everyone know the solution!
PV module operation and maintenance knowledge
1. Dust removal of photovoltaic modules:
At present, some photovoltaic power generation systems only rely on natural effects such as rainfall and wind to remove the dust accumulation of photovoltaic panels. Some small-scale photovoltaic power plants use manual cleaning methods, usually cleaned with mops, rubber scrapers or soft cloths.
Large and medium-sized photovoltaic power plants are difficult to clean manually, and generally use mechanical cleaning methods. High-pressure water gun cleaning, water pressurized to form a water vapor mixture, the surface of the photovoltaic panel is washed away, the cleaning effect is better, so it is widely used by many photovoltaic power stations. In addition, there is a mechanical dust removal technology, which uses a mechanized brush combined with an automatic dust removal device for washing the photovoltaic panel with water spray, etc., and sweeps away the dust by mechanical force.
2. The photovoltaic module avoids shadow blocking:
Before the construction of the photovoltaic power station, it is necessary to do a preliminary survey to determine whether the surrounding high-voltage lines, railings, vegetation, and existing buildings (planned buildings should also be expected early) will be covered, to find ways to eliminate the blocking, change the installation location .
Some people always think about what they can do for the power station, such as installing a fence, setting up a bird-repellent rod to drive off birds, which is a kind and positive move, but there is a counter-effect of "drawing snakes to add". Dimensional knowledge, such as the wrong practice of drying clothes and vegetables in photovoltaic modules, these actions will invisibly cover the power station.
3. The photovoltaic module avoids hot spot effect:
In order to avoid this factor to reduce the performance of photovoltaic modules, this requires the construction project department to do a good job of technical disclosure before construction, and strengthen the spot check of the project quality during the construction process. Only in this way can this situation be prevented from affecting the life of the module.
The measures in the component production section include: controlling the reverse current of the battery, controlling impurities in the battery, and using parallel diode protection for the components.
The measures on the application side are: use batteries (or components) with good performance consistency, try to ensure that the components are not blocked, and clean and clean in time when they are dirty, so that the photovoltaic system maintains a good power output.
Shandong Xinsuju Steel Co.,Ltd. , https://www.sawlpipe.com