US 11,916,397 B2
Combined electric power generations' supply system in off grid independent operation
Osamu Nakakita, Sagamihara (JP); Masayuki Tanaka, Sagamihara (JP); Hiroyuki Suzuki, Sagamihara (JP); Hirotaka Uehara, Sagamihara (JP); Masato Mitsuhashi, Tokyo (JP); and Fujio Eguchi, Sagamihara (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD., Kanagawa (JP)
Appl. No. 17/426,579
Filed by MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD., Sagamihara (JP)
PCT Filed Aug. 29, 2019, PCT No. PCT/JP2019/033974
§ 371(c)(1), (2) Date Jul. 28, 2021,
PCT Pub. No. WO2020/158029, PCT Pub. Date Aug. 6, 2020.
Claims priority of application No. 2019-017466 (JP), filed on Feb. 1, 2019.
Prior Publication US 2022/0166224 A1, May 26, 2022
Int. Cl. H02J 3/46 (2006.01); H02J 3/32 (2006.01); H02P 9/02 (2006.01)
CPC H02J 3/46 (2013.01) [H02J 3/32 (2013.01); H02P 9/02 (2013.01); H02J 2300/22 (2020.01)] 6 Claims
OG exemplary drawing
 
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.