Power conversion device and method for controlling power conversion device

A power conversion device arranged between a power supply and a group of a first power supply port, a second power supply port, and a third power supply port, the power conversion device comprising:

• an inverter configured to convert power output from the power supply into single-phase three-wire alternating-current power and single-phase two-wire alternating-current power, the inverter including a first terminal, a second terminal, and a neutral point terminal;
• a state detector configured to detect a state of the inverter;
• a distribution board configured to distribute power output from the inverter such that the single-phase three-wire alternating-current power is supplied to the first power supply port and the single-phase two-wire alternating-current power is supplied to the second power supply port and the third power supply port;
• and
• processing circuitry configured to control the inverter and the distribution board, wherein
• the inverter includes a first inverter circuit and a second inverter circuit that are connected in parallel to the power supply,
• the first inverter circuit and the second inverter circuit each include a first output terminal and a second output terminal and are configured to generate the single-phase two-wire alternating-current power between the first output terminal and the second output terminal by converting the power output from the power supply,
• the first output terminal of the first inverter circuit is connected to the first terminal,
• the second output terminal of the second inverter circuit is connected to the second terminal,
• the second output terminal of the first inverter circuit and the first output terminal of the second inverter circuit are connected to each other at a connection point,
• the connection point is connected to the neutral point terminal,
• the distribution board includes
• a first switch configured to switch a connection state between the first terminal and the first power supply port and a connection state between the second terminal and the first power supply port,
• a second switch configured to switch a connection state between the first terminal and the second power supply port and a connection state between the neutral point terminal and the second power supply port, and
• a third switch configured to switch a connection state between the neutral point terminal and the third power supply port and a connection state between the second terminal and the third power supply port, and
• the processing circuitry is configured to
• determine whether there is an anomaly in one of the first inverter circuit and the second inverter circuit based on a detection result of the state detector, and
• when determining that there is an anomaly in one of the first inverter circuit and the second inverter circuit, stop the inverter circuit determined to have the anomaly and switch the first switch to an open state.