Heat pump device, heat pump system, and method for controlling inverter

A heat pump device comprising:

• a compressor including a compression mechanism that compresses a refrigerant;
• a motor that actuates the compression mechanism of the compressor;
• an inverter that applies a voltage to the motor;
• and
• an inverter control unit that controls the inverter by outputting a drive signal to the inverter, wherein
• a current value flowing in the inverter is detected and a component having a predetermined first frequency or higher in detected current value is reduced,
• when the component having the first frequency or higher is equal to or larger than a predetermined current value, an output of a drive signal from the inverter control unit to the inverter is stopped,
• the inverter control unit comprises
• a voltage-command generation unit that generates and outputs a voltage command value, and a value of the voltage command value is controlled such that the voltage command value generated by the voltage-command generation unit becomes a value that is equal to or larger than a lower limit determined according to the first frequency,
• wherein the inverter control unit controls the value of the voltage command value such that the voltage command value generated by the voltage-command generation unit becomes a value that is equal to or smaller than an upper limit determined according to an amplitude value of a reference signal having a predetermined second frequency,
• wherein the inverter control unit further comprises a phase switching unit that switches and outputs a voltage phase for generating the voltage command in synchronization with the reference signal,
• the voltage-command generation unit generates the voltage command value by using a phase output from the phase switching unit and an amplitude value V*, and
• the inverter control unit controls the voltage command value to be equal to or smaller than the upper limit by controlling the amplitude value V* to be equal to or smaller than a second value determined according to an amplitude value of the reference signal.