Multi-channel MPPT link capable of being freely combined and used for photovoltaic grid-connected inverter

The invention discloses a multi-channel MPPT link capable of being freely combined and used for a photovoltaic grid-connected inverter. The multi-channel MPPT link capable of being freely combined and used for the photovoltaic grid-connected inverter comprises n basic MPPT channels and one output, wherein each basic MPPT channel is provided with one PV input connector, more than one basic MPPT channel is connected in parallel to form one equivalent MPPT channel, one equivalent MPPT channel is connected with one PV input which is arranged outside, the PV input which is arranged outside is divided into multiple input lines, and each input line is connected with the PV input connector arranged in each basic MPPT channel of the equivalent MPPT channel. The multi-channel MPPT link capable of being freely combined and used for the photovoltaic grid-connected inverter can achieve different combined schemes of 1-n independent MPPT at most, improves flexibility of input photovoltaic array configuration of the same typ