I am trying to integrate the low voltage dc bus of a solid state transformer(SST) with a dc microgrid. My SST and DC microgrid are operating fine individually. But when i try to connect all of these through a common dc bus, the whole system goes unstable. Since i used different capacitor values for the dc-dc converters of microgrid, when i connect them in parallel with the SST low voltage side capacitor, the equivalent capacitor value of the entire dc bus is changed. Is this the main reason for this unstable condition. (My SST low voltage side capacitor is 10mF and the output capacitor of battery bidirectional dc-dc converter is 1 mF).