However, the integrated power converter having multiple interfacing ports (defined as multi-port DC/DC converter, or multi-input DC/DC converter) , could be used to replace the individual single-input DC/DC converters, achieving the effective link among the various renewable power generating units, energy storage elements and load by only one power electronic converter.

It consists of a fuel cell,an isolated uni-directional converter,a bi-directional converter,an inverter and a battery.

Bi-directional converter implements bi-directional energy transfer in the system, so the core of energy management is effective control bi-directional converter.

Due to complemented operation of switches in bi-directional converter, traditional soft start method will give rise to large inverse inductor current from the output source at double sources application, and result in damage of converter.

For isolated-type symmetry half-bridge bidirectional converter with phase-shifted control,a simplified circuit under 4 modes using the primary windings of transformer as reference object is built.

Generalized method and steps to model a bidirectional converter derived from the switching function concept and the black-box method using Matlab/ Simulink are proposed.