公开(公告)号：US20180219394A1

公开(公告)日：2018-08-02

申请号：US15785991

申请日：2017-10-17

Applicant: OMRON Corporation

Inventor： Kohei TOMITA ,  Akihiko SANO

IPC: H02J7/00 ,  H02H1/00 ,  G01R31/40

Abstract: In a solar power generation system, a solar battery string is connected to a PCS via an electric path. In the solar battery string, a plurality of solar battery units having a solar battery module and an optimizer that optimizes an output voltage of the solar battery module are connected in series. In an arc detection apparatus, capacitors form bypass current paths that bypass the optimizer, and an electric current sensor is provided on the electric path.

公开(公告)号：US20180233901A1

公开(公告)日：2018-08-16

申请号：US15751158

申请日：2016-11-29

Applicant: OMRON Corporation

Inventor： Takeshi ASHIDA ,  Kohei TOMITA

IPC: H02H7/20 ,  G01R31/02 ,  H02H1/00 ,  H02S40/32 ,  H02S40/30

CPC classification number: H02H7/20 ,  G01R31/025 ,  H02H1/0015 ,  H02S40/30 ,  H02S40/32 ,  H02S50/00

Abstract: The objective of the present invention is to reduce erroneous detection of arcs, and to reduce erroneous responses concomitant with erroneous detection. In a photovoltaic power generation system (100), a main control part (37) controls an arc detecting device (40) in such a way as to suspend arc detection during periods in which arc-like noise is being generated. Examples that can be cited of periods during which arc-like noise is generated include a period from when a PCS (30) starts up to when the supply of power to a power grid (80) begins, and a period during which a current (I) flowing from a power generating device (10) to the PCS (30) is changing suddenly.

公开(公告)号：US20170324236A1

公开(公告)日：2017-11-09

申请号：US15657306

申请日：2017-07-24

Applicant: OMRON Corporation

Inventor： Kohei TOMITA ,  Toru FUJII ,  Reiko HATTORI ,  Takeshi ASHIDA

IPC: H02H1/00 ,  H02H3/32 ,  H02H3/10 ,  H01L31/02 ,  G01R31/12 ,  H02H7/20 ,  G01R31/08

CPC classification number: H02H1/0015 ,  G01R31/08 ,  G01R31/1227 ,  G01R31/40 ,  H01L31/02021 ,  H02H3/10 ,  H02H3/32 ,  H02H7/20 ,  H02S50/00

Abstract: An arc detector includes a current sensor, a power spectrum conversion unit that converts an output from the current sensor to a power spectrum, a section value obtaining unit that divides an arc measurement section for the power spectrum into a plurality of regions, and obtains, from region values for the plurality of regions excluding a maximum one of the region values, a region value to be a section value of the arc measurement section, and an arc determination unit that determines a presence of an arc by comparing the section value with a threshold.

公开(公告)号：US20180210022A1

公开(公告)日：2018-07-26

申请号：US15785905

申请日：2017-10-17

Applicant: OMRON Corporation

Inventor： Kohei TOMITA ,  Takeshi ASHIDA

IPC: G01R31/02 ,  H02H1/00 ,  G01R31/40

CPC classification number: G01R31/024 ,  G01R31/40 ,  H02H1/0015 ,  H02S50/10

Abstract: In a solar power generation system, a solar battery string is connected to a PCS via power lines, a DC-DC converter, and power lines. In an arc detection apparatus, capacitors constitute bypass current paths that bypass the DC-DC converter, and an electric current sensor is provided on the power line. Impedances of the capacitors satisfy a condition that a combined impedance of the impedances, impedances of the DC-DC converter, and an impedance of the PCS is smaller than an impedance of the DC-DC converter.

公开(公告)号：US20180166589A1

公开(公告)日：2018-06-14

申请号：US15786732

申请日：2017-10-18

Applicant: OMRON Corporation

Inventor： Tsuyoshi TAKEUCHI ,  Akihiko SANO ,  Kohei TOMITA

IPC: H01L31/02 ,  H02S50/10 ,  H01L31/0443

Abstract: A defect number determination unit determines whether or not a solar cell string is defective in a plurality of positions on the basis of whether or not a combined impedance found from impedances in the case where an inspection signal is applied to a P terminal and an N terminal of the solar cell string deviates from a reference impedance by greater than or equal to a predetermined threshold.

公开(公告)号：US20190288643A1

公开(公告)日：2019-09-19

申请号：US16251101

申请日：2019-01-18

Applicant: OMRON Corporation

Inventor： Satoru IKEMOTO ,  Kohei TOMITA ,  Naoki MAKI ,  Takayuki KUROKI

IPC: H02S50/10 ,  G01R31/08 ,  G01R31/12

Abstract: In the disclosure, the occurrence of an arc is rapidly detected while the frequency of erroneous detection is suppressed. An arc detecting apparatus includes an arc presence/absence determining part determining presence or absence of an arc based on an AC current measured by a current sensor measuring a current from a solar cell, and a repeat number setting part setting, based on a signal strength of the AC current, a repeat number of processing that the arc presence/absence determining part repeatedly performs to determine the presence or absence of the arc.

公开(公告)号：US20180231597A1

公开(公告)日：2018-08-16

申请号：US15751879

申请日：2016-11-22

Applicant: OMRON Corporation

Inventor： Takeshi ASHIDA ,  Kohei TOMITA

IPC: G01R31/02 ,  G01R31/08 ,  H02H1/00 ,  H02H3/42 ,  H02S50/10

CPC classification number: G01R31/02 ,  G01R31/08 ,  H02H1/0015 ,  H02H3/042 ,  H02H3/42 ,  H02H7/20 ,  H02S50/00 ,  H02S50/10

Abstract: In order to identify an arc occurrence position in a DC power source, this arc occurrence position detection device (15) is provided with an arc detection unit (31) which detects occurrence of arc in a solar battery string (11), a disconnection position detection unit (32) which detects a disconnection position in the solar battery string (11), and a main control unit (33) which, when the arc has occurred, outputs the disconnection position detected by the disconnection position detection unit (32) as the arc occurrence position.

公开(公告)号：US20180167029A1

公开(公告)日：2018-06-14

申请号：US15787979

申请日：2017-10-19

Applicant: OMRON Corporation

Inventor： Akihiko SANO ,  Kohei TOMITA ,  Tsuyoshi TAKEUCHI ,  Takuya NAKAI ,  Akihiro FUNAMOTO

IPC: H02S50/10

CPC classification number: H02S50/10 ,  H02S50/00

Abstract: A storage unit stores a defect correlation table indicating what influence a given type of defect will have on the inspection of the other types of defects. When an obtainment unit obtains an inspection result of inspecting for a defect, an influence determination unit refers to the defect correlation table and determines the influence of the other types of defects on the inspection result. Information pertaining to the determined influence is outputted via an output unit.

公开(公告)号：US20190288500A1

公开(公告)日：2019-09-19

申请号：US16249912

申请日：2019-01-17

Applicant: OMRON Corporation

Inventor： Kohei TOMITA ,  Satoru IKEMOTO ,  Naoki MAKI ,  Takayuki KUROKI

IPC: H02H1/00 ,  H02S40/32 ,  H02H3/32 ,  H02S50/10

Abstract: In the disclosure, the occurrence of an arc is rapidly detected while the frequency of erroneous detection is suppressed. An arc detecting apparatus includes an arc presence/absence determining part determining presence or absence of an arc based on an AC current from a solar cell, and a repeat number setting part setting, based on the DC current from the solar cell, a repeat number of processing that the arc presence/absence determining part repeatedly performs to determine the presence or absence of the arc.

公开(公告)号：US20180226919A1

公开(公告)日：2018-08-09

申请号：US15820454

申请日：2017-11-22

Applicant: OMRON Corporation

Inventor： Kohei TOMITA ,  Akihiko SANO ,  Arno van Zwam

IPC: H02S50/10 ,  G01R31/12

CPC classification number: H02S50/10 ,  G01R31/1272 ,  H02H1/0015 ,  H02H7/268 ,  H02J3/385 ,  Y02E10/58

Abstract: In a photovoltaic power generation system, a solar battery string is connected to a string optimizer via power lines, and a solar battery string is connected to the string optimizer via power lines. The string optimizer is connected to a PCS via power lines. In an arc detection apparatus, capacitors form a bypass current route bypassing the string optimizer, and a current sensor is provided in the power line.