公开(公告)号：US20240291390A1

公开(公告)日：2024-08-29

申请号：US18572720

申请日：2022-06-15

Applicant: IKS Co., Ltd.

Inventor： Yuichi KADO ,  Takashi IMAI ,  Takao GOTO

IPC: H02M3/335 ,  H02J3/36

CPC classification number: H02M3/33576 ,  H02J3/36

Abstract: With a control apparatus for a three-terminal static DC transformer for drive-controlling the three-terminal static DC transformer, a computing unit is provided with first, second, and third self-excited single-phase inverters so that each of voltages at their AC sides is caused to become a rectangular wave of three levels which are a positive voltage, a null voltage, and a negative voltage, wherein the rectangular wave is caused to undergo time changes so that the rectangular wave of the positive voltage is repeated in a half-cycle by being folded at the null voltage; and the computing unit drives each of the first, second, and third self-excited single-phase inverters so that a product of a length of a section in which the AC-side voltage of each of the first, second, and third self-excited single-phase inverters is not zero, and a voltage between the first, second, and third DC terminals becomes equal.

公开(公告)号：US20230179083A1

公开(公告)日：2023-06-08

申请号：US17911549

申请日：2020-03-17

Applicant: IKS Co., Ltd.

Inventor： Takamasa YAMAZAKI ,  Kouichi HIRAOKA ,  Kazuhito SASAKI ,  Makoto MIYATA ,  Takashi IMAI ,  Hideaki ABUMI ,  Takao GOTO

IPC: H02M1/08

CPC classification number: H02M1/083

Abstract: A control unit is provided with a step-down unit which causes a system voltage of each phase of a system to step down, a voltage pulse signal generation unit which generates a voltage pulse signal of each phase that was stepped down by the step-down unit, a current pulse signal generation unit which generates a current pulse signal of each phase of the system, a zero crossing point detection unit which outputs time information of a zero crossing point of the system voltage and the system current of each phase based on the voltage pulse signal and the current pulse signal of each phase of the system, and an arithmetic unit which calculates, respectively, a value of active power and a value of reactive power of AC power output by the power conditioner to the system based on the time information of the zero crossing point of the system voltage and the system current of each phase of the system provided from the zero crossing point detection unit, and thereby controls the power conditioner.