Multiple inverters run independently and are connected to the grid

Hou et al. point out that the grid-connected current of inverters in parallel operation consists of three parts, namely the average current, ZSCC and differential circulating current and a decomposed current control scheme is proposed to minimise the differential current from equivalent circuit models.

The grid-connected current amplitudes of two inverters are 6 A. The inductance of 1# inverter is 10 mH, and that of 2# inverter is 6 mH. Fig. 19 shows the proposed current control strategy is more effective in the circulating current suppression and the grid-connected current control.

Several multi-level inverters with multiple DC link voltage sources like PV sources have been discussed in Section 3.2. In a CHB based GCMLI, as all of the H-bridges share the same amount of grid current, it is a necessity to implement a unique grid current control loop.

Conventional two-level inverters when used as an interface between PV sources and the grid (Myrzik, 2001, Kjaer et al., 2005) were found unsuitable for the medium and high voltage utility grid due to a smaller number of output voltage levels (Colak et al., 2011a) and hence, greater harmonics in the injected grid current.

First and foremost, connecting two inverters in series can only be done if the inverters produce direct current (DC) output and you want to increase the voltage level. This is similar to how batteries are connected in series to increase voltage. However, most inverters convert DC to alternating current (AC) for household use.

Yes, you can run two power inverters together, but there are specific considerations. Ideally, the inverters should be of the same brand and model to ensure consistent performance and synchronization. When connected in parallel, their outputs are combined, increasing total power capacity.