In the previous article, we explained why your photovoltaic power plant has low power generation from the perspective of components, and today we supplement the reasons for the low power generation from the problem of system operation.
system operation problems
A key factor that affects power generation is system efficiency. If the system efficiency is reduced, we can meet the requirements through the local update or maintenance of the equipment.
01
Temperature-induced Efficiency Reduction
The solar cell module will reduce the output voltage and increase the current due to temperature changes, the actual efficiency of the module will decrease, and the power generation will decrease.
Treatment measures
In the design, the voltage change caused by the temperature change is considered, and the number of components in series is selected according to the change to ensure that the components can work within the maximum tracking power range most of the time.
Treatment measures
In the design, the voltage change caused by the temperature change is considered, and the number of components in series is selected according to the change to ensure that the components can work within the maximum tracking power range most of the time.
02
Inverter temperature is too high
Inverter temperature is too high
Due to the high ambient temperature and the unreasonable installation position, the inverter is exposed to direct sunlight. When the temperature of the inverter itself rises to a certain value, due to the characteristics of the electronic components, the inverter will automatically reduce the power output. power generation.
Treatment measures
① The inverter is installed in a cool and ventilated place, and a sun visor can be installed if necessary.
② During installation, pay attention to the minimum distance of up, down, left, and right when installing the inverter, and do not install a 360° protective cover without dead angle for the inverter.
Treatment measures
① The inverter is installed in a cool and ventilated place, and a sun visor can be installed if necessary.
② During installation, pay attention to the minimum distance of up, down, left, and right when installing the inverter, and do not install a 360° protective cover without dead angle for the inverter.
03
The grid voltage is too high
When the grid voltage is too high and exceeds the upper limit of the safety regulations, the machine will report that the grid voltage exceeds the upper limit of the safety regulations. If the grid voltage does not exceed the upper limit of the safety regulations but is close to the upper limit of the safety regulations, the internal voltage regulation function of the inverter will start and the output will be automatically reduced power to adapt to the grid voltage, resulting in a reduction in power generation.
① When multiple machines are connected to the grid at the same time, the total current after the grid connection point increases, the voltage drop on the AC side cable increases, and the AC side voltage of the inverter also increases.
② The cable between the AC side and the grid connection point is too long and too thin, the resistance of the cable itself is large, the voltage drop on the cable will increase, and the voltage on the AC side of the inverter will increase.
Treatment measures
①If multiple inverters are connected to the grid at the same time, you can turn off one or more inverters to check whether the real-time power increases. Separately connected to the grid.
② Check whether the model, grid connection distance and cable diameter meet the standard requirements. If they do not meet the requirements, it is recommended to replace the national standard copper wire with a larger diameter.
① When multiple machines are connected to the grid at the same time, the total current after the grid connection point increases, the voltage drop on the AC side cable increases, and the AC side voltage of the inverter also increases.
② The cable between the AC side and the grid connection point is too long and too thin, the resistance of the cable itself is large, the voltage drop on the cable will increase, and the voltage on the AC side of the inverter will increase.
Treatment measures
①If multiple inverters are connected to the grid at the same time, you can turn off one or more inverters to check whether the real-time power increases. Separately connected to the grid.
② Check whether the model, grid connection distance and cable diameter meet the standard requirements. If they do not meet the requirements, it is recommended to replace the national standard copper wire with a larger diameter.
For more information on products for PV system, please feel free to call Slocable at 86-769-22010201. You can also email us at pv@slocable.com.cn.
