Centralized inverter technology is a number of parallel PV series are connected to the DC input of the same centralized inverter, the general power of the use of three-phase IGB T power module, the use of small power field effect transistor, while using DSP conversion controller to improve the quality of the generated power, so that it is very close to the sine wave current. It is generally used in large photovoltaic power stations (>10kW). The biggest feature is the high power and low cost of the system. However, because the output voltage and current of different photovoltaic clusters are often not completely matched (especially when the photovoltaic clusters are partially blocked due to cloudy, shade, stains and other reasons), the centralized inverter will lead to the reduction of the efficiency of the inverter process and the decrease of the energy of the battery. At the same time, the power generation reliability of the whole photovoltaic system is affected by the bad working state of a photovoltaic unit group. The latest research direction is the use of space vector modulation control and the development of new inverter topology connection to achieve high efficiency under partial load.

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