In order to overcome the random and intermittent of photovoltaic(PV)power generation

realize the high reliability and quality of power supply

a hierarchical control method based on photovoltaic/storage battery/super capacitor/fuel cell(FC)DC generation system is proposed. For the multi-parameter and non-linear characteristic of hybrid DC power supply system

the control of upper layer designs differential flatness method to compensate non-linear components directly

which realizes the non-linear dynamic reversibility of system

makes the DC bus voltage still stable under situations of great changes of PV output

loads and system parameters. Meanwhile

the upper layer provides reference track for total load current to lower layer. Aiming at different characteristics of multiple power sources in the hybrid DC power supply system

the control of lower layer utilizes model prediction method to design weighting factors to extend cycle life of the system. According to the conditions of photovoltaic output and load demand

the charging and discharging rate of storage unit is dynamically adjusted

which makes the system immediately track the current expectation of total loads to achieve the reasonable distribution of power in various sources. Based on the MATLAB/Simulink

the simulation results show the feasibility and effectiveness of proposed method

which has simple structure

rapid response

high robustness and good stability.