华为光伏逆变器靠得住性剖析(国外英文资料).docVIP

华为光伏逆变器可靠性分析(国外英文资料) Huawei pv inverter reliability analysis Solar power systems are usually directly exposed to work in the outdoor environment, often meet with high temperature, cold, humidity, wind, rain, salt fog and other bad weather conditions. Huawei reliability laboratory industry initiative developed by temperature, humidity, corrosive dust three comprehensive stress test equipment, make the inverter product in bad scenario application has the remarkable ability to adapt. For outdoor applications, the use of high temperature, in the rain, charged temperature cycle, field exposure, such as accelerating method, verified the long-term reliability of the inverter, ensure the long-term stable operation. The temperature change mechanism Temperature is different, the material of the structure of the molecular motion of different speeds, appears expansion coefficient between different materials, the matching of heat transfer performance, easy to cause parts of card tight flabby. IGBT module and radiator thermal mismatch between, different material contraction or expansion rate, may induce the deformation or fracture of components, surface coating cracking and worsen or leak tightness, insulation protection failure, etc. Usually the temperature change is slow, the effect is not obvious. Drastic changes in temperature may temporarily or permanently affect the normal work of the equipment. Temperature at the same time, the rapid change of easy in veneer, the position such as casing to form condensation, and water freezes or wait for a phenomenon, the risk of operation of the inverter. The temperature change case The temperature of the inverter is mainly the temperature difference of the region, the temperature difference, the temperature difference of the season, the temperature difference such as the sun, the wind, the rain. At the same time, the temperature difference between the heat source and the device and the shell is also formed, causing the temperature diffe