How to use solar photovoltaic power station in the salt fog environment?

In the salt fog and humidity environment, the main sources of salt fog and wet dust. Centralized inverter generally placed in the house or the container, due to its large and concentration of calorific value, generally adopts direct wind duct forced air cooling method, direct extraction from outdoor air

in the salt fog and humidity environment, the main pollution sources is a wet dust and salt fog. Centralized inverter is usually placed in a brick house or container. Due to the heat generated by the large and concentrated, general use direct ventilation duct forced air cooling, from outdoor air extraction empty directly into the frequency conversion machine room, and then through the conversion and the cooling air duct ( Outlet) To the outside. In this case, the external salt fog particles and moisture will be inhaled by inverter, and accumulate on the internal components, such as circuit boards, connectors, IGBT module, power distribution switch and copper platoon cable, etc. The chloride ion plays a main role in the process of salt fog corrosion damage. The chloride ion is easy to penetrate the metal oxide layer and protective layer on the surface of the electrochemical reaction with internal metal. At the same time, chlorine ion can contain certain hydration, easily absorbed by the pore and crack on the surface of the metal, displacement and displacement chloride layer of oxygen, insoluble oxide into soluble chloride, make passivation surface active surface, reduce the components of the surface of the insulating ability and the connection of electrical conductivity, lead to product failure. In addition, the inverter working at relatively high temperatures during the day and night to stop working. The difference between air temperature and frequency converter body temperature will lead to water condensation on the frequency converter. Two days later, temperature, water vapor evaporation, but salt fog particles condensation and corrosion in the bronze medal. Air humidity is very harmful. If power station built in fish ponds, near coastal areas and mudflats, around the empty air humidity, moisture through direct ventilation into the frequency conversion chamber, prone to internal condensation control equipment, and creepage flashover accident. With IP54 protection grade, direct ventilation and the concentration of frequency conversion machine room, computer room and equipment anti-dust mesh filter is limited to only a few of the larger dust particle size, no filter to salt fog and moisture protection. Inside the converter, common protective coating ( Such as copper platoon coating layer and the case) And protect the paint, Such as anti-corrosion paint printed circuit board) Can't fully protect salt fog and wet dust. Can be seen from the above situation, if the photovoltaic power station to meet in the salt fog and high humidity environment more than 20 years of life asking, both in design and equipment selection should take measures in advance, otherwise the consequence is unimaginable. Photovoltaic power station of the main parts: parts, bracket, cable, inverter, ac/DC power distribution equipment, etc. Need to consider from all aspects. Inverter as the core of photovoltaic power station, has the very high value, its impact on the reliability of power generation. Reasonable choice and protection is the most important factors in the scheme. From the point of the failure mechanism analysis and case, conventional vessel or assembly ( IP55 protection grade) Can't solve the problem of salt fog and high humidity. IP20 protection level for the inverter, power distribution equipment, if used in the salt fog and wet environment, the protection of key method is to realize the electrical and external wet salt spray air isolation body, to eliminate hidden dangers and guarantee the long-term reliability. Centralized inverter and series inverters have different solutions.