An inverter apparatus, wherein the inverter apparatus comprises a plurality of protection units and a plurality of inverter units; each of the plurality of protection units comprises an input terminal, an output terminal, and a control terminal, each of the plurality of inverter units comprises a direct current input terminal and an alternating current output terminal, the input terminal of each protection unit is configured to connect to one of a plurality of direct current source units in a power supply system, the output terminal of each protection unit is connected to the direct current input terminal of one of the plurality of inverter units, and the alternating current output terminal of each inverter unit is configured to connect to a power grid; any one of the plurality of protection units is configured to: when a voltage at the input terminal of the any protection unit is greater than a voltage at the output terminal of the any protection unit, a path between the input terminal of the any protection unit and the output terminal of the any protection unit is in a forward conducted state; when a voltage at the output terminal of the any protection unit is greater than a voltage at the input terminal of the any protection unit, a path between the input terminal of the any protection unit and the output terminal of the any protection unit is in a reverse cut-off state; or when the control terminal of the any protection unit receives a first trigger signal, a path between the input terminal of the any protection unit and the output terminal of the any protection unit is in a reverse conducted state, characterised in that the input terminals of the plurality of protection units are configured to connect to a same energy storage system. each of the plurality of protection units comprises an input terminal, an output terminal, and a control terminal, each of the plurality of inverter units comprises a direct current input terminal and an alternating current output terminal, the input terminal of each protection unit is configured to connect to one of a plurality of direct current source units in a power supply system, the output terminal of each protection unit is connected to the direct current input terminal of one of the plurality of inverter units, and the alternating current output terminal of each inverter unit is configured to connect to a power grid; any one of the plurality of protection units is configured to: when a voltage at the input terminal of the any protection unit is greater than a voltage at the output terminal of the any protection unit, a path between the input terminal of the any protection unit and the output terminal of the any protection unit is in a forward conducted state; when a voltage at the output terminal of the any protection unit is greater than a voltage at the input terminal of the any protection unit, a path between the input terminal of the any protection unit and the output terminal of the any protection unit is in a reverse cut-off state; or when the control terminal of the any protection unit receives a first trigger signal, a path between the input terminal of the any protection unit and the output terminal of the any protection unit is in a reverse conducted state,