As I understand, you want to do evaluation test with simulation of a live working DGs of different kind (a combination of both AC and DC power output systems....Hybrid systems). These days, there are higher rated VSI (PWM) to accomodate many inputs from the different DC DGs. Or you can also use more than one inverter which is also practical. You may need to see from both efficiency and cost point of view. Such systems are more common as off-grid systems as autonomous micro- grid.
Check out my publications, you might get some idea.
Below there are some of the papers that describe the micro-grid implemented by the Electrical Energy Systems group of the University of Calabria.
Such a micro-grid consists of a DC bus connected with several inverters that interface the different sources.
In addition to having the theoretical implementation solution, we have practically implemented this micro-grid at our University. Now it is made up of a DC Bus interfaced with: the power grid inverter, a photovoltaic plant, an inverter that supplies the privileged loads, a storage system, a biomass micro-generator (Stirling-engine). The solution is modular, so many inverters can be interfaced on this DC-Bus microgid.