What is the workflow and principle of a photovoltaic inverter?

As one of the main core components of the photovoltaic system, the inverter needs to be integrated with other components and provided to the ultimate power plant investment owner for use. Before photovoltaic systems are supplied to terminal owners for use, there are corresponding system design, system component integration, and system installation processes. Although the end users are generally photovoltaic ground power station investment owners, industrial and commercial investment owners, or household investment owners, equipment can also be purchased by certain types of customers in the intermediate process, such as EPC contractors, photovoltaic system integrators, or photovoltaic system installers.
Currently, inverter products are mainly divided into four categories, namely, centralized inverter (mainly used in large ground power plants, with a power range of 250kW-10MW), distributed inverter (mainly used in complex large ground power plants, with a power range of 1MW-10MW) String inverter (mainly used for household, small industrial and commercial distributed and ground power stations, with a power range of 1.5kW-250kW) and micro inverter (mainly used for household and other small power stations, with a power level of 200W-1500W).
Among them, the large-scale centralized photovoltaic inverter is a power electronic device that converts the DC power generated by photovoltaic modules into larger DC power and then converts it into AC power. Therefore, the power of such photovoltaic inverters is relatively large, and centralized inverters of over 500KW are generally used. Especially in recent years, with the rapid development of power electronics technology, the power of large-scale centralized photovoltaic inverters has become increasingly large, gradually increasing from 500 KW to 630 KW, 1.25 MW, 2.5 MW, 3.125 MW, and so on. At the same time, the voltage level is also becoming higher and higher. Large centralized photovoltaic inverters have the advantages of large output power, simple operation and maintenance, mature technology, high power quality, and low cost. They are generally suitable for large ground photovoltaic power stations, agricultural photovoltaic complementary photovoltaic power stations, and water photovoltaic power stations. At the same time, due to its high single output power and high voltage level, with technological progress in recent years, it has begun to integrate with downstream transformers, forming an integrated solution of "inverter boost" and an integrated solution of optical storage combined with energy storage.
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