US 12,476,469 B2
Electric power control system simulating a synchronous generator
Kazuyori Tahata, Tokyo (JP); Yoshiyuki Kono, Tokyo (JP); Shuhei Fujiwara, Tokyo (JP); and Shinji Tominaga, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Appl. No. 18/261,927
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Feb. 5, 2021, PCT No. PCT/JP2021/004413
§ 371(c)(1), (2) Date Jul. 18, 2023,
PCT Pub. No. WO2022/168283, PCT Pub. Date Aug. 11, 2022.
Prior Publication US 2024/0088673 A1, Mar. 14, 2024
Int. Cl. H02J 3/46 (2006.01); H02J 3/48 (2006.01)
CPC H02J 3/46 (2013.01) [H02J 3/48 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An electric power control system, comprising:
a plurality of power converters connected in parallel, wherein
each power converter, among the plurality of power converters, converts a direct-current power of an electricity storage device connected to the power converter into an alternating-current power, and outputs the alternating-current power to a power system via a converter transformer;
a power generator simulation unit to simulate characteristics of a synchronous generator based on an aggregate active power to generate a phase for an alternating-current voltage output from the power converter, the aggregate active power being a total sum of active powers output from the plurality of power converters; and
a signal generation unit to generate a control signal for the power converter based on the phase of the alternating-current voltage for the power converter generated by the power generator simulation unit, wherein
the power generator simulation unit
generates a first angular frequency deviation based on a first difference between the aggregate active power and a target value of the aggregate active power, and
generates the phase of the alternating-current voltage output from the power converter based on the first angular frequency deviation.