The string inverter has become the most popular inverter in the international market. The string inverter is based on the modular concept. Each photovoltaic string (1kW-5kW) passes an inverter with maximum power peak tracking at the DC end and is connected to the grid in parallel at the AC end. Many large photovoltaic power plants use string inverters. The advantage is that it is not affected by module differences and shading between strings, while reducing the optimal operating point of photovoltaic modules.
Mismatch with the inverter, which increases power generation. These technical advantages not only reduce the system cost, but also increase the reliability of the system. At the same time, the concept of "master-slave" is introduced between the strings, so that in the case that a single string of energy cannot make a single inverter work, several groups of photovoltaic strings are linked together, and one or more of them work. To produce more electricity. The latest concept is that several inverters form a "team" with each other instead of the "master-slave" concept, which makes the reliability of the system a step further.
