US 12,273,042 B2
Power conversion system and power conversion control method
Naoto Niimura, Tokyo (JP)
Assigned to TMEIC CORPORATION, Chuo-ku (JP)
Appl. No. 18/007,214
Filed by TMEIC Corporation, Chuo-ku (JP)
PCT Filed Jan. 8, 2021, PCT No. PCT/JP2021/000585
§ 371(c)(1), (2) Date Jan. 27, 2023,
PCT Pub. No. WO2022/149288, PCT Pub. Date Jul. 14, 2022.
Prior Publication US 2024/0258906 A1, Aug. 1, 2024
Int. Cl. H02M 5/458 (2006.01)
CPC H02M 5/458 (2013.01) 13 Claims
OG exemplary drawing
 
1. A power conversion system interconnected to a multi-phase alternating current (AC) power system, the power conversion system comprising:
a plurality of converters including a plurality of switches and provided in parallel for each phase of the power system; and
a control unit configured to control the plurality of converters according to carrier comparison type pulse width modulation (PWM) control using a plurality of carrier signals having a prescribed phase difference from each other,
wherein the control unit detects a current of a primary side of the plurality of converters at each of four or more even-numbered timings when the four or more even-numbered timings are defined at prescribed time intervals during one cycle of a specific carrier signal among the plurality of carrier signals,
wherein the control unit generates a reference voltage for the PWM control using a value of the detected current of the primary side and a value of a reference current of the primary side and updates the reference voltage at each of the four or more even-numbered timings, and
wherein the control unit controls a specific converter among the plurality of converters using the specific carrier signal and the updated reference voltage.