Alternating-current grid-connected direct-current electronic load used for locomotive power supply test

The invention discloses an alternating-current grid-connected direct-current electronic load used for a locomotive power supply test. The load comprises a phase-shift full-bridge module, a full-bridge inverter, a digital control unit, a logic control module, a switching value input signal module and a switching value output signal output module. The phase-shift full-bridge module completes a simulation function of the electronic load through controlling an input current. The full-bridge inverter feeds consumption energy back to a power grid during a 600V power supply test process. In a control portion, a control method of combining the digital control unit and the logic control module is adopted. The digital control unit mainly completes an algorithm control portion, a software protection function, a data acquisition function and a function of establishing communication with an upper computer of a whole apparatus. The logic control module mainly completes a driving pulse processing function to an IGBT and a h