The invention relates to a testing circuit of a half-bridge-structure
voltage source current converter and a modulation method of the testing circuit. The testing circuit comprises a testing power source circuit, a
direct current power source, a half-bridge-structure
voltage source current converter sub-module 1, an impedance load and a half-bridge-structure
voltage source current converter sub-module 2. According to the modulation method, by setting the output voltage of the
direct current power source, the voltage of a
direct current bus meets the requirement, and a direct current side
capacitor of the half-bridge-structure
voltage source current converter is charged; after charging is stable, a circuit controller is controlled to output PWM pulse signals, and the half-bridge-structure
voltage source current converter operates under different work conditions; by measuring the current and the voltage of the impedance load and simulating various faults of the half-bridge-structure
voltage source current converter, the performance and stability of the half-bridge-structure voltage source current converter are checked. By constructing the various work conditions of the half-bridge-structure voltage source current converter, the experimental
verification requirements of the design of the half-bridge-structure voltage source current converter and a unit controller control strategy are met.