In this paper, we study the unbalance problem of the input Direct Current (DC) voltages of the five-level neutral point clamping (NPC) voltage source inverter (VSI) used in hybrid renewable energy system. The hybrid system is composed of doubly fFed induction generator (DFIG) driven by wind turbine, the rotor is connected to three fivelevel NPC VSI feed by photovoltaic voltage source. We show particularly the problem of the instability of the DC voltages of the inverter and its consequence on the performances of the DFIG. Then, we propose a solution by using fuzzy logic technique in closed loop regulation. We add clamping bridge to stabilize the four DC input voltages of the five-level NPC. The results are full of promise to be used to stabilize the input DC voltages of the five-level NPC VSI in this kind of application

Keywords: Wind system, Photovoltaic (PV) system, Maximum power point tracking (MPPT), Doubly fed induction generator (DFIG), Fuzzy logic control