I recommend that you can see some famous research centre in Power Electronic, like ETH, CPES, Fraunhofer, ORNL, The University of Tennessee, AAU, and so on.
For hardware, the Wide bandgap devices have huge potential in PE, from the module packaging to the converter and also new topologies which is suitable of using new SiC or GaN devices.
I wish you can make some great contributions to power electronic, good luck.
The research related to the use of Artificial Intelligence for power electronics applications is gaining more and more attention, e.g., Reinforcement Learning (RL).
FYI, you can have a look at the following references related to RL.
Ref[1]: Article A Reinforcement Learning Approach for MPPT Control Method of...
Ref[2]: Conference Paper Multi-objective reinforcement learning algorithm and its app...
Ref[3]: Article An Overview of Artificial Intelligence Applications for Powe...
Ref[4]:Article An Adaptive Network-Based Reinforcement Learning Method for ...