Patent ID: 11916397
Assignee: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 3:
4. A combined electric power generations' supply system comprising:
an AC power generator configured to supply electric power by off grid independent operation:
a DC power supply device;
an inverter connected to the same bus as the AC power generator and configured to convert DC power output by the DC power supply device into AC power; and
a control device configured to control the inverter,
wherein the control device includes:
a rotation calculation unit configured to calculate a value relating to a rotation of a rotor of a virtual power generator when the virtual power generator is driven according to an active power command based on a rotor model that simulates driving of the virtual power generator and calculates a value relating to the rotation of the rotor of the virtual power generator and the active power command;
an output determination unit configured to determine a value relating to a voltage frequency to be output to the inverter based on the calculated value relating to the rotation; and
a modulation control unit configured to perform control of a pulse width modulation of the inverter based on the determined voltage frequency,

wherein a time constant relating to synchronization power of the rotor model matches a time constant relating to synchronization power with the AC power generator,
wherein the control device includes a drive torque calculation unit configured to calculate a value relating to a drive torque of the virtual power generator by inputting a voltage frequency and an actual voltage of the bus and a frequency command and an active power command for the inverter, into a governor model that determines a value relating to a drive torque of the virtual power generator based on the active power of the bus, the frequency command, the active power command, and the actual voltage of the bus, and
wherein the rotation calculation unit is configured to calculate a value relating to the rotation of the virtual power generator based on the calculated value relating to the drive torque and the rotor model.