same configuration of photovoltaic products, are the power generation of photovoltaic power plants different? How to improve photovoltaic efficiency will be higher? Ccement. Com/richtext/IMG/zrj93v0syh1695174275072. Normally, the solar radiation utilization efficiency of photovoltaic systems is only about 10%. Therefore, the intensity of solar radiation, spectral characteristics and climate conditions should be taken into account. Inclination angle of the of PV module The azimuth angle
of the PV module is generally selected in the due south direction to maximize the power generation per unit capacity of the PV plant. As long as it is within ± 20 ° due south, it will not have a great impact on power generation. If conditions permit, it should be as far as 20 ° southwest as possible. Tilt angles vary from place to place, and local installers are more familiar with the optimum tilt angle for components. If it is a sloping roof, in order to save brackets, many of them will be tiled on the roof, regardless of the angle of inclination, for the sake of beauty. Efficiency and quality photovoltaic modules There are many types of modules to choose from in the market, such as polysilicon, monocrystalline silicon, etc. Different modules have different power generation efficiency, attenuation and quality.
Calculation formula: theoretical power generation = annual average total solar radiation * total cell area * photoelectric conversion efficiency . There are two factors: cell area and photoelectric conversion efficiency. The conversion efficiency has a direct impact on the power generation of the power station.
Most importantly, when choosing a brand, we must choose the products of well-known brands, and we must buy them from regular channels, so as to ensure stable and reliable power generation for 25 years.
Component matching loss
Current loss is caused by component current difference when connected in series, and voltage loss is caused by component voltage difference when connected in parallel. The loss may reach more than 8%.
In order to reduce the matching loss and increase the power generation of the power station, attention should be paid to the following aspects:
1. Reduce the matching loss and try to use components with the same current in series ;
2. the attenuation of the components is kept as consistent as possible;
3.
Temperature (ventilation)
Data show that when the temperature rises by 1 ℃, the output power of crystalline silicon photovoltaic modules decreases by 0. Therefore, it is necessary to avoid the impact of temperature on power generation and maintain good ventilation conditions for modules. We see a lot of photovoltaic power stations sealed in the back and on both sides, and we need to leave a door on both sides to facilitate ventilation . The influence of
dust should not be underestimated
Power Point Tracking (MPPT)
MPPT efficiency is a key factor in determining the power generation of photovoltaic inverters, and its importance far exceeds the efficiency of photovoltaic inverters themselves. MPPT efficiency is equal to hardware efficiency multiplied by software efficiency. The hardware efficiency is mainly determined by the accuracy of the current sensor and the accuracy of the sampling circuit; the software efficiency is determined by the sampling frequency. There are many ways to implement MPPT, but no matter which method is used, the first step is to measure the change of component power, and then react to the change. The key component is the current sensor, whose accuracy and linearity error will directly determine the hard efficiency, and the sampling frequency of the software is also determined by the accuracy of the hardware.
To reduce line loss
, cables account for a small part of the photovoltaic system, but the impact of cables on power generation can not be ignored. It is suggested that the line loss of DC and AC circuits of the system should be controlled within 5%. Cables in the system shall be provided with insulation performance, heat-resistant and flame-retardant performance, moisture-proof and light-proof performance, type of cable core and size and specification of cable. Therefore, in daily operation and maintenance, we need to check whether the line is damaged, whether there will be leakage and other conditions, especially after each typhoon and hail, it is essential to check whether the line and connector are loose.
The
inverter is the main component and important part of the photovoltaic system. In order to ensure the normal operation of the power station, the correct configuration and selection of the inverter is particularly important. The configuration of the inverter should be based on the technical indicators of the whole photovoltaic power generation system and refer to the product sample manual provided by the manufacturer. Generally, the following technical indicators should be considered:
1. Rated output power
2. Adjustment performance
of output voltage 3. Overall efficiency
4.
There are not many environments that affect the efficiency of inverters in daily life. Pay attention to install the inverter in a cool place and keep ventilation around it to facilitate the heat dissipation of the inverter. Especially in summer and autumn, normal heat dissipation can maintain the power generation efficiency of the inverter.
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