Inverters are the brains and hearts of photovoltaic power generation systems. In the solar PV process, the power generated by the photovoltaic array is DC, whereas many loads require AC power. Dc power supply system has great limitations, it is not easy to transform voltage, load application range is also limited, except for special power load, all need to use inverter to convert DC to AC. The photovoltaic inverter is the heart of the solar photovoltaic power generation system. It converts the direct current generated by the photovoltaic modules into alternating current, which is sent to the local load or the power grid, and has the related protection functions of the power electronic equipment. Photovoltaic inverter is mainly composed of power module, control circuit board, circuit breaker, filter, reactor, transformer, contactor and cabinet, etc. The production process includes electronic parts pre-processing, whole machine assembly, testing and whole machine packaging and other technological links. Its development depends on the development of power electronics technology, semiconductor device technology and modern control technology