The invention discloses a photovoltaic grid-connected system and photovoltaic grid-connected inverters so as to inhibit a PID (potential induced degradation) effect in the photovoltaic grid-connected system. The photovoltaic grid-connected system comprises multiple photovoltaic grid-connected inverters, a PID inhibiting device, dummy neutral point devices in one-to-one correspondence with the photovoltaic grid-connected inverters and controllable switches in one-to-one correspondence with the photovoltaic grid-connected inverters, wherein direct current sides of the photovoltaic grid-connected inverters are connected with independent photovoltaic arrays, and alternating current sides of the photovoltaic grid-connected inverters are connected in parallel; each dummy neutral point device is used for constructing a dummy neutral point for the photovoltaic grid-connected inverter connected with the dummy neutral point device; each controllable switch is connected between a negative busbar and the dummy neutral point of the photovoltaic grid-connected inverter corresponding to the controllable switch; the PID inhibiting device is connected between a grid-connected point of the photovoltaic grid-connected inverters and earth and used for raising voltages to earth of the dummy neutral points of the photovoltaic grid-connected inverters.