In summer, rainstorms are frequent, and the impact on photovoltaic power plants is mainly due to the immersion of a large amount of rainwater on cables and components, and the insulation performance is reduced or even damaged, which causes the inverter to detect a fault and cannot generate electricity.
The sloping roof itself has strong drainage capacity, and generally does not cause excessive water accumulation; if the lower edge of the module on a flat roof is low, it may be soaked by rainwater; for photovoltaic power plants installed on the ground, the rainwater washes the ground and may cause the modules to be unbalanced .
Photovoltaic power station flooded by rain
In the face of inevitable natural disasters, what should photovoltaic power plants do?
Choose your location carefully
Considering photovoltaic power generation site selection requirements comprehensively, in terms of hydrological conditions, the short-term maximum precipitation, water depth, flood water level, drainage conditions, etc. should be considered in many ways. The above factors will directly affect the support system of the photovoltaic system, the design of the support foundation and the electrical equipment. installation height. If the water depth is high, the installation height of components and other electrical equipment will be high, and the flood water level will affect the safety of the support foundation and electrical equipment. Poor drainage conditions will lead to long-term flooding of foundations and metal supports, which will endanger the safety of the power station.
fully designed
In the design stage, in addition to cost control, according to the hydrological data, for the ground power station and the fishery-optical complementary power station, the designed support height should have a relative margin. For the photovoltaic power station on the lake, it is recommended to adopt a floating design scheme. The drainage system is designed according to the terrain, and the corresponding drainage facilities should be designed and set up according to the local meteorological and hydrological conditions for the ground power station, the fishery-optical hybrid power station and the surface power station.
Flood response
Prevention is the main priority, pay attention to weather conditions in a timely manner, and add temporary drainage facilities before the arrival of heavy rainfall. Management inspections, and special measures for flood control dams in special terrain areas during heavy rainfall. When the photovoltaic power generation system is submerged by water, it may cause electric shock when approaching or touching the photovoltaic inverter (PCS) and the connection between the solar panel and the power supply cable. The solar panel damaged by the flood may have faults such as poor insulation. , there is a danger of electric shock if touched. During the recovery process, avoid bare-hand operation, and take measures to prevent electric shock (use rubber gloves and rubber boots, etc.) to reduce the risk of electric shock.
Equipment selection
Priority should be given to equipment with high protection level, such as: micro-inverter with excellent waterproof performance and IP67 protection level; it can be immersed in water for a long time, and it can be rusted for more than ten years or even decades, and its rigidity will not be reduced. Brackets for structural stability. Equipment manufacturers and technical teams upgrade equipment and technologies to avoid or reduce the losses of photovoltaic power plants after floods.
Choose the right PV insurance
Underwriting direct property losses of photovoltaic power plants caused by natural disasters, accidents, etc. Its main protection is: photovoltaic power generation equipment, power transmission and transformation systems, buildings and other ancillary facilities; insurance liability mainly includes natural disasters, non-mechanical or electrical accidents, and mechanical or electrical accidents.
Specific measures to prevent rainstorms in photovoltaic power plants
1. Carry out a comprehensive inspection of the installed photovoltaic modules and projects under construction, including the adjustment of screw fasteners and fasteners, and immediately replace damaged fasteners. Bind the tandem components on the windward side with double strands of 2 square millimeters of iron wire.
2. Install and fasten windproof rods on the photovoltaic support to prevent the support from twisting with the wind; tamp the ground anchors that have been cut through the rock on both sides of the series; tighten all the bolts in the whole site;
3. Strengthen the patrol inspection of components and brackets. Once loose components and brackets are found, fix them in time.
4. If the load of the color steel tile roof does not meet the load-bearing requirements, it must be reinforced according to the correct plan.
Note: During the inspection operation and maintenance in rainy days, avoid electrical operations with bare hands, and do not directly touch the inverter, components, cables, terminals, etc. with your hands. You need to wear rubber gloves and rubber boots to reduce the risk of electric shock.
What about our own safety?
Take shelter from the rain
Do not shelter from rain under transformers or overhead lines
Thunderstorms can easily cause short-circuit and discharge of bare wires or transformers, and strong winds may blow off wires, resulting in electric shock.
Do not shelter from the rain under trees or billboards
Do not stay or take shelter under tall trees or large billboards next to power lines.
travel away
stay away from standing water
When traveling in thunderstorms, you should stay away from the road sections with accumulated water. If you have to wade into the water, you must observe whether there is any electrical equipment nearby to ensure safety and avoid electric shock.
Stay away from utility poles, street light poles and cable-stayed wires
The cable-stayed iron wire is close to the electric wire, and it may be accidentally electrified in bad weather. The street light pole is easy to leak electricity through the water, and it is far away from the telephone pole, street lamp pole and cable-stayed iron wire to prevent electric shock accidents.