Considering that DC microgrids should exhibit excellent robustness and coordination when facing source-load side disturbances and the instability problem caused by constant power load (CPL)

the paper proposes an autonomous passivity model predictive control strategy based on fixed-time feedforward decoupling for boost converter parallel system as the object of study. Firstly

the fixed-time sliding mode disturbance observer (FTSMDO) with online estimation of source-load side information is designed

which not only reduces number of system sensors

but also avoids the coupling disturbance of coordinate transformation. Then

combining passivity and model predictive control theories to propose the advanced control strategy that possess the advantages of both and compensate their respective weaknesses

while realizing decentralized power sharing autonomous control structure under fixed-time feed-forward decoupling of observers. Moreover

the stability analysis method of the bifurcation diagram based on the discrete-time model of the system is proposed

which explores the critical power of constant power load and the selection criterion of decoupling control parameters. Finally

the effectiveness and superiority of proposed controller is verified through simulation and experimental results with less system prior knowledge.