Power conversion device and harmonic restraint device

A power conversion device comprising:

• a DC power supply connected between a first power supply wiring and a first ground wiring;
• a power converter configured to convert, into an AC voltage, a first power supply voltage between the first power supply wiring and the first ground wiring;
• a control device connected between a second power supply wiring and a second ground wiring, the second power supply wiring being configured to supply a second power supply voltage lower than the first power supply voltage, the control device being configured to control the power converter;
• and
• a separation device configured to separate the first ground wiring and the second ground wiring from each other, wherein
• the first ground wiring is electrically connected to the second ground wiring at a single node.