Low-leakage-current improved H8 type non-isolated three-phase grid-connected inverter

The invention discloses a low-leakage-current improved H8 type non-isolated three-phase grid-connected inverter, which comprises a direct-current power supply udc, a three-phase inverter bridge, a filter circuit, a direct-current side capacitor Cdc, an alternating-current power grid and a direct-current side circuit. Positive and negative electrodes of udc are connected with positive and negativeelectrodes of Cdc. The direct-current side circuit comprises a first power switch tube S1, a second power switch tube S2, a diode D1 which is in anti-parallel connection with the S1 and a diode D2 which is in anti-parallel connection with the S2. The drain electrode of the S1 is connected with the positive electrode of Cdc, and the source electrode of the S2 is connected with the negative electrode of Cdc. The direct current side circuit further comprises a diode D11, a diode D12, a diode D21 and a diode D22. Positive electrodes of the diode D11 and the diode D12 are respectively connected toa drain electrode of the S