Centralized inverter generally used with large photovoltaic power station (>10kW) system, many parallel photovoltaic string is connected to the same centralized inverter DC input, the general power of the use of three-phase IGBT power module, less power of the use of field effect transistors, At the same time, the DSP conversion controller is used to improve the quality of the output power, so that it is very close to the sine wave current. The biggest feature is the high power of the system and low cost.
However, due to the matching of photovoltaic string and partial shading, the efficiency and electrical capacity of the whole photovoltaic system are caused. At the same time, the reliability of power generation of the whole photovoltaic system is affected by the poor working state of a certain photovoltaic unit group. The latest research interests are the use of spatial vector modulation control, as well as the development of a new inverter topology connection, in order to obtain a partial load in the case of high efficiency. On the SolarMax (Sauri Mack) centralized inverter, an interface box for a photovoltaic array can be attached to monitor each string of photovoltaic windsurfing strings, and if one of the strings is not working properly, the system will transmit this information to the remote controller, and the string can be stopped from working through remote control. This does not reduce and affect the work and energy output of the entire photovoltaic system due to the failure of a string of photovoltaic strings.