CPC H02M 7/53871 (2013.01) [H02M 1/0009 (2021.05); H02M 1/08 (2013.01); H02M 7/483 (2013.01)] | 19 Claims |
1. An inverter apparatus, wherein the inverter apparatus comprises an inverter circuit and a control unit, the inverter circuit is configured to convert a direct current into two or more levels, and the control unit is configured to:
obtain an output voltage and an output current of the inverter circuit, wherein the output voltage comprises an output voltage direction and an output voltage amplitude, and the output current comprises an output current direction and an output current amplitude;
detect, based on the output voltage direction and the output current direction, whether output power of the inverter circuit is active power or reactive power; and
when the output current amplitude of the reactive power is greater than a current threshold and the detecting detects that the inverter circuit outputs reactive power, control the inverter circuit in a full-bridge two-level bipolar control mode; or
when the detecting detects that the inverter circuit outputs active power, or when the inverter circuit outputs reactive power and the output current amplitude is not greater than a current threshold, control the inverter circuit in a three-level control mode.
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