Solar
inverters can be mainly divided into four categories: centralized, string, distributed and micro inverters. The centralized inverter system has a large total power and is mainly used in large-scale projects such as ground solar power stations with good lighting conditions; distributed inverters can be divided into string
inverters and micro inverters, which are usually used in small and medium-sized Industrial, commercial and household photovoltaic power generation systems, in which string type is the main distributed inverter product type. Distributed
inverters have both centralized and string-type features, and are widely used in projects such as mountain frontrunners. The micro-
inverter is to track the maximum power peak value of each solar module independently, and then merge into the AC grid after inversion. The single-unit capacity of the micro-
inverter is generally below 1kW.
The string
inverter adopts a modular design, which can realize decentralized MPPT optimization. The power station system using the string photovoltaic
inverter usually converts the DC current generated by the modules first through the
inverter for DC-AC conversion, and then merges it into the AC grid after confluence, step-up transformation and AC power distribution. Compared with the centralized inverter, the string
inverter adopts a modular design and has multiple MPPTs; the number of PV modules connected to each MPPT is less, usually 1-4 groups, which can realize distributed MPPT. Search for the best. Since there are few access terminals, when a single component fails, it will only affect the power generation of the module corresponding to the component, which ensures that the power generation efficiency of the overall photovoltaic system is not affected by a single component, and solves the mismatch problem of centralized photovoltaic power plants. .
