公开(公告)号：US12085615B2

公开(公告)日：2024-09-10

申请号：US17278960

申请日：2019-09-24

申请人： Fronius International GmbH

发明人： Joachim Danmayr ,  Christian Kasberger

IPC分类号： G01R31/327 ,  G01R19/165 ,  G01R31/42

CPC分类号： G01R31/3275 ,  G01R19/16547 ,  G01R31/42

摘要： In order to be able to perform a shutdown test on an inverter with little expenditure, a trigger signal is modulated to the AC current or the AC voltage at a first moment, and the inverter is used at a second moment, which occurs a defined duration after the start of the trigger signal at the first moment, to generate an AC current or an AC voltage with a fault signal that is detected by the inverter and which triggers a shutdown of the inverter, and the shutdown moment of the AC current or the AC voltage is determined. A shutdown duration of the inverter is determined from the difference between the shutdown moment and the second moment.

公开(公告)号：US12047046B2

公开(公告)日：2024-07-23

申请号：US17721885

申请日：2022-04-15

申请人： Ig Soo Kwon

发明人： Ig Soo Kwon

IPC分类号： H03G3/30 ,  G01R31/42 ,  H03F3/04 ,  H03K3/037

CPC分类号： H03G3/30 ,  G01R31/42 ,  H03F3/04 ,  H03K3/037 ,  H03G2201/103

摘要： A calibration amplifier includes: a plurality of transistors and a variable resistor configured to change in response to clock pulses. During a calibration cycle, one of the plurality of transistors switches on in each calibration step based on a plurality of enable signals, and a gain of the calibration amplifier changes until an output voltage of the calibration amplifier exceeds a reference voltage and is set to a calibrated gain. The calibration amplifier outputs the output voltage by amplifying an input voltage using the calibrated gain.

公开(公告)号：US12019125B2

公开(公告)日：2024-06-25

申请号：US17019159

申请日：2020-09-11

申请人： GRID20/20, Inc.

发明人： Joe Beaudet ,  Sergio Angeli

IPC分类号： G01R31/40 ,  G01R19/165 ,  G01R19/25 ,  G01R22/06 ,  G01R31/00 ,  G01R31/42 ,  G01R31/62 ,  H04Q9/00 ,  H04Q9/02 ,  G01K13/00 ,  H02S50/00 ,  H02S50/10 ,  H04L67/12

CPC分类号： G01R31/62 ,  G01R19/16538 ,  G01R19/25 ,  G01R19/2513 ,  G01R22/063 ,  G01R31/002 ,  G01R31/40 ,  G01R31/42 ,  H04Q9/00 ,  H04Q9/02 ,  G01K13/00 ,  H02S50/00 ,  H02S50/10 ,  H04L67/12 ,  H04Q2209/40 ,  H04Q2209/60 ,  Y04S40/18

摘要： A transformer monitoring device has one or more voltage sensors and/or one or more current sensors integral with a housing for detecting a voltage of a power cable of a transformer. The transformer monitoring device further has one or more environmental sensors including a smoke sensor, ambient temperature sensor, external transformer temperature sensor, a fire sensor, or a surface and/or ground temperature sensor configured to detect smoke in an area surrounding the transformer and a processor configured to monitor the smoke sensor, the processor configured to transmit an alert if smoke is detected surrounding the transformer.

公开(公告)号：US20240168102A1

公开(公告)日：2024-05-23

申请号：US18516441

申请日：2023-11-21

申请人： Schneider Electric Industries SAS

发明人： Jinlei Xing

IPC分类号： G01R31/42 ,  G01R19/25

CPC分类号： G01R31/42 ,  G01R19/2513

摘要： An apparatus for detecting an islanding state of a power generation device is disclosed. The apparatus includes a first acquisition unit for acquiring a first current amount at a substation; a second acquisition unit for acquiring a second voltage phasor at the power generation device; a processing unit connected with the first acquisition unit and the second acquisition unit, for determining the interconnection impedance between the power generation device and the substation according to the ratio of the variation of the second voltage phasor and the variation of the first current within the same time period, and determining that the power generation device is in an islanding state under the condition that the interconnection impedance meets a predetermined condition. Furthermore, a method for detecting an islanding state of a power generation device and a system for detecting the islanding state of the power generation device is disclosed.

公开(公告)号：US11808794B2

公开(公告)日：2023-11-07

申请号：US17467625

申请日：2021-09-07

申请人： SMA Solar Technology AG

发明人： Vitali Sakschewski ,  Thorsten Buelo ,  Florian Rauscher

IPC分类号： G01R19/25 ,  G01R31/62 ,  G01R29/16 ,  G01R31/42

CPC分类号： G01R19/2513 ,  G01R29/16 ,  G01R31/42 ,  G01R31/62

摘要： The disclosure relates to a method and related device for approximately determining voltages at a high-voltage side of a transformer on the basis of measured voltages at a low-voltage side of the transformer. The method includes measuring delta voltages and phase voltages and phase angles at the low-voltage side of the transformer, transforming the phase voltages and phase angles into positive and negative phase sequence system voltages and phase angles of the positive and negative phase sequence systems, respectively, at the low-voltage side, determining positive and negative phase sequence system voltages and phase angles of the positive and negative phase sequence systems, respectively, at the high-voltage side from the positive and negative phase sequence system voltages and phase angles of the positive and negative phase sequence systems, respectively, at the low-voltage side, determining estimated values of a zero phase sequence system voltage and of a phase angle of a zero phase sequence system at the high-voltage side from the measured delta voltages and phase voltages and phase angles at the low-voltage side, and transforming the positive, negative and zero phase sequence system voltages and the phase angles into phase voltages and/or delta voltages at the high-voltage side of the transformer.

公开(公告)号：US11762030B2

公开(公告)日：2023-09-19

申请号：US16813990

申请日：2020-03-10

申请人： Inventus Holdings, LLC

发明人： Rachana Vidhi ,  Ryan K. McMorrow ,  Carlos H. N. Alves ,  Matthew T. Smith

IPC分类号： G01R31/392 ,  G01R31/42 ,  G01R31/319 ,  G01R31/367 ,  G01R31/389 ,  G01R31/3842 ,  H01M10/48 ,  H01M10/44 ,  G01R31/382

CPC分类号： G01R31/392 ,  G01R31/31907 ,  G01R31/367 ,  G01R31/389 ,  G01R31/3842 ,  G01R31/42 ,  H01M10/441 ,  H01M10/482 ,  G01R31/382

摘要： One example includes a battery power system that includes a plurality of battery containers. Each of the battery containers can include a plurality of battery modules that provide output power to a point-of-interconnect associated with a power grid. Each of a portion of the plurality of battery containers includes a plurality of original battery modules and at least one of a plurality of redistributed battery modules from a redistributed battery container. The redistributed battery container includes battery modules of a substantially similar state-of-health to the plurality of original battery modules of each of the portion of the plurality of battery containers. The redistributed battery container includes a plurality of newer battery modules with a substantially similar state-of-health that is greater than the state-of-health of the plurality of original battery modules and which were subsequently installed after redistribution of the plurality of redistributed battery modules.

公开(公告)号：US20230176142A1

公开(公告)日：2023-06-08

申请号：US17924043

申请日：2021-04-16

申请人： MITSUBISHI ELECTRIC CORPORATION

发明人： Andreja ROJKO

IPC分类号： G01R31/54 ,  G01R31/42 ,  H02M1/32

CPC分类号： G01R31/54 ,  G01R31/42 ,  H02M1/327

摘要： Self-diagnostic method (100) of open-circuit fault, in power switching blocks of a modular inverter comprising a plurality (k=1 . . . n) of blocks (31a, 32a, 33a, 34a, 31b, 32b, 33b, 34b, 31c, 32c, 33c, 34c) in parallel per phase leg (5, 5a, 5b, 5c), and being provided with temperature sensors (6), said method comprising: —sampling and storing (130) temperatures data (I) of said n blocks in a phase leg measured by said temperature sensors at relevant sampling times tSD with a relevant sampling interval ΔtSD; —comparing (150) said temperature data (I) of each (k) block with previously sampled and stored temperature data (II) of said each (k) block and considering a possible fault (FF) on one of said blocks if the following condition is not fulfilled: (III) where Th is a predefined temperature deviation threshold; or —comparing (250) current temperature data (I) of each (k) block with current average temperature data (VI) and considering a fault (OF) on one of said blocks if the following condition is not fulfilled: (V) where ThAV is a predefined average temperature deviation threshold. The invention concerns also a test comprising a shoot-through procedure to identify open circuits in a block.

公开(公告)号：US20190235025A1

公开(公告)日：2019-08-01

申请号：US15881278

申请日：2018-01-26

申请人： HAMILTON SUNDSTRAND CORPORATION

发明人： Steven A. Avritch ,  David F. Dickie

IPC分类号： G01R31/34 ,  G01R31/42 ,  G01R31/06 ,  H02P27/06

CPC分类号： G01R31/343 ,  G01R31/06 ,  G01R31/346 ,  G01R31/42 ,  H02P21/22 ,  H02P27/06 ,  H02P29/0241

摘要： A method of detecting a fault in a sinusoidally controlled permanent magnet synchronous motor (PMSM). The method includes receiving a first rotor reference frame current demand, the first rotor reference frame current demand based on a current control for the PMSM and receiving a first rotor reference frame current feedback, the first rotor reference frame current feedback corresponding to the first rotor reference frame current demand received. The method also includes computing a first error of the rotor reference frame current based on the first rotor reference frame current demand and the first rotor reference frame current feedback and identifying a fault of the sinusoidally controlled PMSM if the first error exceeds a first selected threshold for a first selected duration.

公开(公告)号：US20190229724A1

公开(公告)日：2019-07-25

申请号：US16371331

申请日：2019-04-01

申请人： Texas Instruments Incorporated

发明人： Xiong Li ,  Anant Kamath

IPC分类号： H03K17/567 ,  H03K17/18 ,  G01R31/28

CPC分类号： H03K17/567 ,  G01R31/2608 ,  G01R31/2621 ,  G01R31/2817 ,  G01R31/2837 ,  G01R31/2849 ,  G01R31/42 ,  H03K17/18

摘要： An isolated insulated gate bipolar transistor (IGBT) gate driver is provided which integrates circuits, in-module, to support the measurements of threshold voltage, and collector-emitter saturation voltage of IGBTs. The measured gate threshold and collector-emitter saturation voltage can be used as precursors for state of health predictions for IGBTs. During the measurements, IGBTs are biased under specific conditions chosen to quickly elicit collector-emitter saturation and gate threshold information. Integrated analog-to-digital converter (ADC) circuits are used to convert measured analog signals to a digital format. The digitalized signals are transferred to a micro controller unit (MCU) for further processing through serial peripheral interface (SPI) circuits.

公开(公告)号：US20190195962A1

公开(公告)日：2019-06-27

申请号：US16230755

申请日：2018-12-21

申请人： KONE Corporation

发明人： Matti Mustonen

IPC分类号： G01R31/42 ,  H02P27/16 ,  H02M5/458

CPC分类号： G01R31/42 ,  G01R31/028 ,  H02M5/458 ,  H02P27/16

摘要： The invention relates to a method for maintenance of a frequency converter for driving an electric motor of a transportation device, said frequency converter being supplied with AC mains power via a contactor, and including a rectifier circuit for providing a DC supply voltage, a capacitive intermediate circuit for leveling DC supply voltage, and an inverter circuit for providing power to the electric motor. In the method, after the transportation device has been vacant for a predetermined time period, said contactor is opened to disable power flow from mains supply to the frequency converter, and a test load is connected to the intermediate circuit, parallel to a capacity of the intermediate circuit. The DC supply voltage Udc(t) is detected, and the detected DC supply voltage Udx(t) is utilized for establishing a maintenance information indicating that a maintenance should be done on the frequency converter. Another aspect of the invention is a software program realizing the method when executed on a computer.