BIDIRECTIONAL POWER CONVERSION TOPOLOGY FOR POWER BATTERY TEST EXCITATION POWER SUPPLY, METHOD AND SYSTEM

The invention relates to the technical field of power battery or energy storage battery test systems, and provides a bidirectional power conversion topology for a power battery test excitation power supply, a method, and a system. The topology comprises a three-phase PWM converter, a high-frequency isolation three-level LLC resonant converter and a DC-DC converter. An input end of the three-phase PWM converter is connected to a power grid side. The high-frequency isolation three-level LLC resonant converter is connected in series between the three-phase PWM converter and the DC-DC converter, and is used to achieve bidirectional direct-current voltage conversion and isolation, as well as increase a bus voltage between the high-frequency isolation three-level LLC resonant converter and the DC-DC converter. The DC-DC converter is used to generate a charging and discharging excitation signal for power battery testing. L'invention se rapporte au domaine technique des systèmes de test de batterie d'alimentation ou