This article explains the common problems and solutions of photovoltaic power plants in summer
The efficiency of photovoltaic modules decreases under high temperature environment
High temperature in summer can easily cause the surface temperature of photovoltaic modules to rise, thereby reducing the photoelectric conversion efficiency. In order to deal with this problem, the operation and maintenance personnel of the power station can take the following measures: Regularly clean the surface of photovoltaic modules, reduce the accumulation of dust and dirt, and improve the light transmittance of photovoltaic modules. Optimize the layout of the power station, and reduce the mutual influence of thermal radiation between modules by reasonably designing the parameters such as the inclination angle and row spacing of the modules. Strengthen the monitoring and maintenance of photovoltaic power stations, promptly discover and deal with the problem of excessive temperature, and ensure the normal operation of the power station.
Overheating of the inverter leads to performance degradation
The inverter is one of the core equipment in the photovoltaic power station, and its performance directly affects the power generation efficiency of the power station. In the high temperature environment in summer, the inverter is prone to performance degradation due to overheating. To address this problem, the operation and maintenance personnel can take the following measures: Strengthen the heat dissipation design of the inverter, such as adding cooling fans, improving heat sinks, etc. Regularly check the operating status of the inverter and clean the dust and dirt on the radiator in time. Set up sunshade facilities around the inverter to reduce the ambient temperature.
Cable aging is accelerated
High temperatures and strong ultraviolet radiation in summer will accelerate the aging process of cables, which may cause cable insulation rupture, short circuit and other faults. In order to ensure the safe operation of cables, operation and maintenance personnel can take the following measures:
Select high temperature resistant and anti-aging cable materials.
Regularly check the insulation performance and connection status of cables, and replace aging cables in time.
Set up sunshade facilities around cables to reduce the impact of ultraviolet radiation.
Threat to power station safety from thunderstorms
Summer is a season of frequent thunderstorms, and lightning and heavy rain may pose a serious safety threat to photovoltaic power stations. In order to ensure the safe operation of power stations, operation and maintenance personnel can take the following measures:
Install lightning protection devices, such as lightning rods, lightning strips, etc., to ensure that power station equipment is protected from lightning strikes.
Regularly check the performance and status of lightning protection devices to ensure that they are in good working condition.
Make waterproof preparations before heavy rain, such as checking whether the drainage system is unobstructed and whether the equipment waterproof measures are complete.
The insulation impedance to ground is too low
Summer is rainy and cloudy, and the bushings are wet and easy to get water in; the module waterproof box may also fail... When encountering these problems, the most common error message is "the insulation impedance to ground is too low". The quick solution we can use is to check the DC cable, the module side grounding and the water ingress of the bushing. Most of the panel insulation impedance problems are caused by the damage of the DC cable, which includes the cables between the modules and the cables between the modules and the inverter, especially the cables in the corners and the cables laid in the open air without pipes, which need to be carefully checked. Check the DC or AC bushing. If the bushing does not have a reserved leak or is improperly positioned, a large amount of rainwater will accumulate in the bushing, resulting in too low line insulation impedance. The photovoltaic inverter is not well grounded. If the inverter is not grounded or the grounding is poor, it will affect the inverter's correct detection of the module insulation impedance value to ground, resulting in false alarms.