As an independent photovoltaic system, its DC power generation voltage is relatively low, so the power conditioning device, that is, the inverter, is absolutely indispensable.
There are two main types of inverters used in grid-connected systems to achieve AC power generation.
①Line rectification can use the signal in the power grid as the synchronization reference.
②Self-rectification determines the signal waveform through the internal circuit structure of the inverter, and then inputs it into the power grid.
Products can also be classified according to their application.
① The central inverter is used to rectify the output of large-scale photovoltaic systems with rated power in the range of 20 to 400kWp. The mainstream products at this stage have self-rectifying designs, which are realized through bipolar transistors and field-effect transistors.
② The series inverter is only allowed to receive signals transmitted through independent serial lines, so the rated power is between 1 and 3kWp.
③Duplex series inverters are equipped with various independent DC-DC inverters, which feed signals back to a central inverter device. Such a design can be applied to a variety of different component connection structures, so that the solar cells on each series line can output maximum power.
④The AC component inverter is installed on each photovoltaic component to convert the output of all components into AC.
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