When you have single converter and two different storage options, you can adopt for energy sharing options by applying energy management algorithms or simply by the help of charging conditions levels.
But in your research, you are going to have two different systems, I feel the system would be in this configurations with the same source (Hybrid).
It's better to opt for switching regulators in combinations with energy management schemes. Also, try to read the articles on power sharing controllers.
Refer to few papers: Hope this links would give some information related to your query.
Use a reversing elevator inverter or said also buck/boost inverter. Just add a control loop for the SC current. In total, you will use two PI regulators and the energy will be recovered automatically.