With the increasing popularity of clean energy such as photovoltaic power generation, more and more enterprises have installed photovoltaic power stations. While enjoying various benefits brought by photovoltaic power generation, power station owners cannot ignore the maintenance and cleaning of the power station at home.
Correct maintenance and maintenance can not only ensure the power generation of the power station, but also ensure a sufficient service life.
Let's follow along to learn how to do the post-maintenance maintenance of photovoltaic power plants!
1. Cleanup of pollutants
Generally, the lifespan of photovoltaic modules is more than 30 years. Regularly cleaning the shields such as bird droppings and leaves on the module panels can ensure that the panels can maximize sunlight exposure.
If you usually prefer cleanliness and have higher requirements for power generation effects, you can also clean the components yourself, but you need to pay attention to the following points.
1. Generally, component cleaning is performed in the morning or late afternoon. When personnel are cleaning, it is forbidden to stand less than 1 meter from the edge of the roof.
2. Before cleaning the components, check whether there is any abnormal power output record in the monitoring records, analyze whether it may cause leakage, and check whether the connecting wires and related components of the components are damaged or stuck, and you need to use a test pen before cleaning. The components are tested on aluminum frames, brackets, and tempered glass surfaces. In order to eliminate hidden dangers of leakage and ensure personal safety.
3. Personnel cleaning components should wear corresponding work clothes and hats to avoid scratching and injury. Hooks and straps on clothing or tools should be prohibited. Threads and other parts that are easy to cause entanglement.
4. It is strictly forbidden to clean photovoltaic modules under the meteorological conditions of strong wind, heavy rain, thunderstorm or heavy snow. Winter cleaning should avoid rinsing and do not rinse with cold water when the panels are hot.
5. It is strictly forbidden to use hard and sharp tools or corrosive solvents and alkaline organic solvents to wipe photovoltaic modules, and it is forbidden to spray cleaning water into the module junction box, cable tray, combiner box and other equipment.
It is not recommended for users to clean by themselves without knowing the relevant professional cleaning knowledge. It is best to ask professional photovoltaic cleaning personnel for cleaning and maintenance, so as to better ensure that the photovoltaic modules are not damaged during the cleaning process.
2. Maintenance of components and brackets
1. The surface of photovoltaic modules should be kept clean. Dry or damp soft and clean cloth should be used to wipe photovoltaic modules. It is strictly forbidden to use corrosive solvents or hard objects to wipe photovoltaic modules. PV modules should be cleaned when the irradiance is lower than 200W/㎡, and it is not advisable to use liquids with a large temperature difference from the modules to clean the modules.
2. The live warning signs on the photovoltaic modules shall not be lost.
3. Photovoltaic modules should be checked regularly. If the following problems are found, the photovoltaic modules should be adjusted or replaced immediately. Photovoltaic modules have broken glass, scorched backplanes, and obvious color changes; there are air bubbles in the PV modules that form a communication channel with the edge of the module or any circuit; the PV module junction box is deformed, twisted, cracked or burned, and the terminals cannot be good get in touch with.
4. For photovoltaic modules using metal frame, the frame and bracket should be well combined, the contact resistance between the two should not be greater than 4Ω, and the frame must be firmly grounded.
5. Use a DC clamp-type ammeter to measure the input current of each PV module string connected to the same DC combiner box under the condition that the solar radiation intensity is basically the same, and the deviation should not exceed 5%.
3. Maintenance of combiner box
1. The DC combiner box must not be deformed, corroded, leaked, or deposited. The safety warning signs on the outer surface of the box should be intact and unbroken, and the waterproof lock on the box should be flexible to open and close.
2. The terminals in the DC combiner box should not be loose or corroded.
3. The specifications of the high-voltage DC fuses in the DC combiner box should meet the design requirements.
4. The insulation resistance of the positive pole to the ground and the negative pole to the ground of the DC output bus should be greater than 2 megohms.
5. The DC circuit breaker equipped at the DC output bus terminal should be flexible and reliable in its breaking function.
6. The lightning arrester in the DC combiner box should be effective.
Fourth, the maintenance of the inverter
1. The inverter structure and electrical connection should be kept intact, there should be no corrosion, dust accumulation, etc., the heat dissipation environment should be good, and there should be no large vibration and abnormal noise when the inverter is running.
2. The warning signs on the inverter should be intact and undamaged.
3. The cooling fans of the modules, reactors and transformers in the inverter should start and stop automatically according to the temperature. The function of the cooling fan should be normal. There should be no large vibration and abnormal noise when the cooling fan is running.
4. Disconnect the circuit breaker on the AC output side (grid side) once regularly, and the inverter should immediately stop feeding power to the grid.
5. If the temperature of the DC bus capacitor in the inverter is too high or exceeds the service life, it should be replaced in time.
Five, cable maintenance
1. The parts of the cables entering and leaving the equipment should be sealed well, and there should be no holes with a diameter greater than 10mm, otherwise they should be blocked with fireproof mud walls.
2. There should be no perforations, cracks and significant unevenness at the mouth of the cable protection steel pipe, the inner wall should be smooth, the metal cable pipe should not be severely corroded, and there should be no burrs, hard objects, and garbage. If there are burrs, use them after filing. The cable jacket is wrapped and tied tightly.
3. The stakes along the direct buried cable line should be intact, and the ground near the path should not be excavated to ensure that no heavy objects, building materials and temporary facilities are stacked on the ground along the path, and no corrosive substances are discharged to ensure that the outdoor exposed ground cable protection facilities are intact.
4. Ensure that the cover plate of the cable trench or cable well is intact, there should be no water or debris in the trench, ensure that the bracket in the trench should be firm, whether there is rust or looseness, and the sheath and armor of the armored cable should not be seriously damaged. Rust.
5. For multiple cables laid in parallel, the current distribution and the temperature of the cable sheath should be checked to prevent the cables from burning out the connection points due to poor contact.
Six, extreme weather maintenance
1. If it trips when it rains, it may be that the terminal is not tight. If such a situation occurs, it must be dealt with after the rain has passed. The terminal can be wrapped with insulating tape, and then observe whether the tripping occurs. If the tripping phenomenon continues, It should be reported to the service center or local power station.
2. During thunderstorms, the air switch below the meter should be turned off to prevent damage to electrical equipment. After the thunderstorm is over, turn the switch back on.