Frequency converter type intelligent interference electricity protection device

The utility model provides a frequency converter type intelligent interference electricity protection device which comprises a bus voltage monitoring unit, a state identification unit, a direct current bus monitoring unit, a bus monitoring unit, a differential pressure monitoring unit, a logic control unit, an execution unit and a backup direct current unit. The input voltage of the frequency converter is monitored through the bus voltage monitoring unit, and the DC bus voltage of the frequency converter and the voltage of the backup DC unit for maintaining the DC bus voltage are respectively monitored through the DC bus monitoring unit and the backup bus monitoring unit, so that the shutdown condition of the frequency converter under-voltage interference electricity can be accurately judged; compared with a traditional mode that a charging capacitor is directly connected to a direct-current bus of the frequency converter in parallel, electric energy stored in the backup direct-current unit can be accurately