Maoshuo Electric Photovoltaic Grid-connected Inverter

What is a transformerless PV inverter?

The single-phase transformerless PV inverters have become an industrial technology for a long time in grid integration of solar plants. In recent years, these string inverter topologies lower than 5 kW rated power have been widely used in low power solar micro inverters.

Which string inverter topologies are used in low power solar micro inverters?

In recent years, these string inverter topologies lower than 5 kW rated power have been widely used in low power solar micro inverters. The most recent topologies such as H-bridge, NPC, H-NPC, HERIC, T-type, H5 and H6 are being widely used in commercial micro inverters.

Are MPPT methods still used in a single-phase solar inverter?

Therefore, it should be noted that regular and conventional MPPT methods will not be considered any longer. Another remark achieved from literature surveys is the circuit topologies in inverter section of a single-phase solar inverter that are beyond the conventional H-bridge, namely H4, or two-level topologies.

Which inverter topologies are used for grid connections?

If we recall the inverter topologies given in figures Fig. 4, Fig. 7 and Figs. 9–14, it can be seen that the grid connections are performed by commonly using H4, and novel topologies such as H5, oH5, H6 and HERIC type inverter section that follows the HF transformer or output of intermediate DC-link stage.

Which micro inverter topologies provide power decoupling and MPPT control?

The two-stage or multi-stage topologies provide power decoupling and MPPT control at the first stage while active and reactive control with grid connection are performed at the output stage. The list of recent isolated micro inverter topologies are presented in Fig. 8.