Device and method for testing IGBT (Insulated Gate Bipolar Translator) submodule of controllable commutation converter valve

The invention relates to a device and a method for testing an IGBT (Insulated Gate Bipolar Translator) sub-module of a controllable commutation converter valve. The device comprises a voltage and current acquisition unit, a power supply unit of a plurality of programmable power supplies, a power supply excitation output unit directly connected with the IGBT sub-module to be tested, and a main control unit, the main control unit is respectively in communication connection with the power supply unit, the power supply excitation output unit and the voltage and current acquisition unit; the power supply unit is connected with an input power supply and outputs various programmable power supplies to the power supply excitation output unit; the power supply excitation output unit outputs various programmable power supply output voltage selections and internal resistance selections of the power supply unit to two ends of the IGBT sub-module to be tested, and discharges internal energy of the IGBT sub-module; and the