Voltage transient variation compensation circuit charged by three-phase three-line transformerless phase voltage

The invention discloses a voltage transient variation compensation circuit charged by a three-phase three-line transformerless phase voltage. The voltage transient variation compensation circuit comprises a three-phase inlet inductance circuit, a double-half wave rectification circuit, an AC bypass switch circuit, an inversion circuit, a filter circuit and a three-phase load circuit, wherein the three-phase inlet inductance circuit, the double-half wave rectification circuit, the AC bypass switch circuit and the three-phase load circuit are connected in series, and the inversion circuit and the filter circuit are both connected in parallel with the AC bypass switch circuit. In the voltage transient variation compensation circuit charged by the three-phase three-line transformerless phase voltage, disclosed by the invention, an industrial frequency transformer is not needed to reconstruct a neutral point of a power supply, a DC bus of an injected voltage inverter is charged by the phase voltage in a three-phase three-line power supply, and overhigh bus voltage is prevented.