With the progress of photovoltaic power generation technology and the increase of grid connected operation scale of photovoltaic power generation, problems such as optimization, improvement and operation cost of photovoltaic power stations have seriously restricted the development of photovoltaic power generation. Among them, due to the large area and wide distribution of photovoltaic arrays, it is easy to have "PV modules cracks", "Line aging", "hot spot" and "PID effect" The grid connected inverter is prone to overvoltage, overcurrent, power tube short circuit, open circuit and other faults. These seriously affect the life of photovoltaic modules and the safe and stable operation of photovoltaic power plants. In particular, large grid connected inverters assume the responsibility of feeding power to the grid, and the failure of any key component in their main circuit will cause the entire photovoltaic power station to shut down or even damage the equipment, and a longer shutdown time will reduce the power generation revenue of the power station. These failures of photovoltaic power station seriously affect the normal operation of photovoltaic power generation system.

In order to prevent more serious accidents caused by failures, reduce the loss of revenue of the power station, and timely detect the equipment failures of the photovoltaic power station, it is helpful for the stable and efficient operation of the photovoltaic power station, and it is convenient to take corresponding countermeasures at the beginning of the equipment failure of the photovoltaic power station. Through online monitoring of the operation of photovoltaic power station equipment, timely analyze and handle the fault symptoms, determine the cause and location of the equipment fault, which is also conducive to the work of photovoltaic power station maintenance personnel. Therefore, it is of great significance to study the fault detection and diagnosis methods of photovoltaic power station equipment to realize the stable, reliable and economic operation of photovoltaic power station, and to promote the large-scale development of photovoltaic power generation in China

NOA, as a fair and authoritative third-party service organization in the industry with multiple recognitions at home and abroad, has advanced power station testing equipment and a professional technical service team. Based on IEC 60904, GB/T 9535, IEC 62446, IEC 61215 and other standards, according to the requirements of contracts, technical specifications, key equipment related standards, sampling standards and other requirements, it provides full life cycle testing services and authoritative reports for various types of photovoltaic power plants.