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

Claim 0:
1. 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;
a field voltage calculation unit configured to calculate a value relating to a field voltage of the virtual power generator by inputting the bus voltage and a reactive power command for the inverter to an Automatic Voltage Regulator (AVR) model that determines a value relating to the field voltage of the virtual power generator based on the bus voltage and the reactive power command;
an output determination unit configured to determine a value relating to a voltage frequency, a value relating to an active power, and a value relating to a reactive power to be output to the inverter based on the calculated value relating to the rotation and the value relating to the field voltage; and
a modulation control unit configured to perform control of a pulse width modulation of the inverter based on the determined voltage frequency, active power, and reactive power,
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, and
wherein a droop gain of the AVR model is different from a droop gain of the AC power generator.