US 12,463,554 B2
Inverter, parallel inverter system, and method of controlling inverter
Naoki Ayai, Osaka (JP)
Assigned to SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka (JP)
Appl. No. 18/278,410
Filed by Sumitomo Electric Industries, Ltd., Osaka (JP)
PCT Filed Nov. 2, 2021, PCT No. PCT/JP2021/040360
§ 371(c)(1), (2) Date Aug. 23, 2023,
PCT Pub. No. WO2022/185614, PCT Pub. Date Sep. 9, 2022.
Claims priority of application No. 2021-033734 (JP), filed on Mar. 3, 2021.
Prior Publication US 2024/0136947 A1, Apr. 25, 2024
Prior Publication US 2024/0235421 A9, Jul. 11, 2024
Int. Cl. H02M 7/493 (2007.01); H02J 3/24 (2006.01); H02J 3/40 (2006.01); H02J 3/46 (2006.01); H02M 1/00 (2006.01); H02J 3/38 (2006.01); H02M 7/539 (2006.01)
CPC H02M 7/493 (2013.01) [H02J 3/241 (2020.01); H02J 3/40 (2013.01); H02M 1/0025 (2021.05); H02J 3/381 (2013.01); H02J 3/46 (2013.01); H02J 2300/24 (2020.01); H02M 7/539 (2013.01)] 7 Claims
OG exemplary drawing
 
7. A method of controlling an inverter connected in parallel to an alternating-current circuit to which an alternating-current power source is connected, and configured to provide an independent output to the alternating-current circuit, the method comprising:
converting, by a power converter, a direct-current power into an alternating-current power to supply power to the alternating-current circuit, wherein
a controller configured to control the power converter is configured to add frequency feedback processing to an operation of calculating a frequency detection value in a phase locked loop to be executed based on an alternating-current voltage of the alternating-current circuit, the frequency feedback processing being processing of adding a frequency correction value obtained by performing a proportional integral operation on a comparison result between a previous value of the frequency detection value and a frequency reference value.