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    Current protection to prevent overcurrent in electrical grids and motors
    1.
    发明授权
    Current protection to prevent overcurrent in electrical grids and motors 有权

    公开(公告)号：US12100943B2

    公开(公告)日：2024-09-24

    申请号：US17830179

    申请日：2022-06-01

    Applicant: Caterpillar Inc.

    Inventor： Jesse R. Gerdes ,  Jackson Wai ,  Seok-hee Han

    IPC: H02H3/08 ,  H02M1/00 ,  H02M1/32 ,  H02M7/5387 ,  H02P29/024

    CPC classification number: H02H3/083 ,  H02M1/0009 ,  H02M1/32 ,  H02M7/53871 ,  H02P29/027

    Abstract: An apparatus can include an inverter to provide an output N-phase alternating-current to an external component. When N equals two, a phase of the N phases can include an upper gate and a lower gate. The apparatus can also include a current detector configured to detect a phase current magnitude of the output alternating current. The apparatus can also include a controller coupled to the current detector and to the inverter. The controller can generate a gate command for controlling a gate of the inverter. The controller can also determine a value for a current threshold less than a shutoff current threshold for the external component. The controller can provide a protection command to turn off the upper gate of a corresponding phase of the inverter responsive to detecting that the phase current magnitude is greater than the current threshold.

    Flux estimator for switched reluctance machines
    4.
    发明授权
    Flux estimator for switched reluctance machines 有权

    公开(公告)号：US09800192B1

    公开(公告)日：2017-10-24

    申请号：US15093477

    申请日：2016-04-07

    Applicant: Caterpillar Inc.

    Inventor： Seok-hee Han ,  Jackson Wai ,  Ahmed Khalil ,  Jesse Gerdes ,  James Michael Thorne ,  Sangameshwar Sonth

    IPC: H02P25/08 ,  H02P25/092 ,  H02P23/14

    CPC classification number: H02P25/092 ,  H02P23/14 ,  H02P25/089

    Abstract: A control system for a multi-phase switched reluctance (SR) machine, having at least two phases, is disclosed. The control system may include a converter circuit and a controller. The controller may include a phase voltage estimator module configured to determine a first phase voltage and a second phase voltage associated with a second phase second phase for the SR machine. The controller may further include a flux estimator module configured to determine first and second estimated fluxes, the first estimated flux associated with the first phase and based on the first phase voltage and an associated first mutual voltage and the second estimated flux the second estimated flux associated with the second phase and based on the second phase voltage and an associated second mutual voltage, and a position observer module configured to determine a rotor position based at least partially on the first estimated flux, the second mutual flux.

    FLUX ESTIMATOR FOR SWITCHED RELUCTANCE MACHINES
    5.
    发明申请
    FLUX ESTIMATOR FOR SWITCHED RELUCTANCE MACHINES 有权

    公开(公告)号：US20170294858A1

    公开(公告)日：2017-10-12

    申请号：US15093477

    申请日：2016-04-07

    Applicant: Caterpillar Inc.

    Inventor： Seok-hee Han ,  Jackson Wai ,  Ahmed Khalil ,  Jesse Gerdes ,  James Michael Thorne ,  Sangameshwar Sonth

    IPC: H02P25/092 ,  H02P23/14

    CPC classification number: H02P25/092 ,  H02P23/14 ,  H02P25/089

    Abstract: A control system for a multi-phase switched reluctance (SR) machine, having at least two phases, is disclosed. The control system may include a converter circuit and a controller. The controller may include a phase voltage estimator module configured to determine a first phase voltage and a second phase voltage associated with a second phase second phase for the SR machine. The controller may further include a flux estimator module configured to determine first and second estimated fluxes, the first estimated flux associated with the first phase and based on the first phase voltage and an associated first mutual voltage and the second estimated flux the second estimated flux associated with the second phase and based on the second phase voltage and an associated second mutual voltage, and a position observer module configured to determine a rotor position based at least partially on the first estimated flux, the second mutual flux.

    TECHNIQUES FOR LIMITING POWER USING AN ACTIVE FRONT END
    6.
    发明公开
    TECHNIQUES FOR LIMITING POWER USING AN ACTIVE FRONT END 审中-公开

    公开(公告)号：US20240079876A1

    公开(公告)日：2024-03-07

    申请号：US17901585

    申请日：2022-09-01

    Applicant: Caterpillar Inc.

    Inventor： Seok-hee Han ,  Jesse R. Gerdes ,  Jackson Wai

    IPC: H02J3/16 ,  H02J7/00 ,  H02J7/34

    CPC classification number: H02J3/16 ,  H02J7/007182 ,  H02J7/345 ,  H02J2207/50

    Abstract: Techniques to limit electrical power when forming an electrical grid using an active front end unit having an inverter that is coupled to a capacitor (and inductor) that is coupled to an electrical grid. For example, to limit power, the integration of a commanded frequency of the system can be limited to be within a specified phase delta of a measured phase angle of an electrical grid voltage vector. The calculation from power limit to phase delta can be done when the phase of the electrical grid voltage vector has been determined to be accurate and is calculated based on the measured capacitor voltage, grid voltage, and the estimated voltage drop across the output components of the system.

    Sensorless Control of Switched Reluctance Machines for Low Speeds and Standstill
    8.
    发明申请
    Sensorless Control of Switched Reluctance Machines for Low Speeds and Standstill 审中-公开
    用于低速和静止的开关磁阻机的无传感器控制

    公开(公告)号：US20150381087A1

    公开(公告)日：2015-12-31

    申请号：US14314510

    申请日：2014-06-25

    Applicant: Caterpillar Inc.

    Inventor： Seok-hee Han ,  Carlos Nino Baron ,  Jackson Wai ,  Ahmed Khalil ,  Ernesto Inoa ,  Jesse Gerdes ,  James Michael Thorne

    IPC: H02P6/18

    CPC classification number: H02P6/185 ,  H02P6/18 ,  H02P25/08 ,  H02P25/089 ,  H02P27/06

    Abstract: A method for determining rotor position of a switched reluctance (SR) machine having a rotor and a stator is provided. The method may include injecting a test pulse into one or more idle phases of the SR machine, determining a decoupled flux value based at least partially on a total flux value corresponding to the test pulse and a mutual flux value, and determining the rotor position based at least partially on the decoupled flux value.

    Abstract translation: 提供了一种用于确定具有转子和定子的开关磁阻（SR）机器的转子位置的方法。 该方法可以包括将测试脉冲注入到SR机器的一个或多个空闲阶段中，至少部分地基于对应于测试脉冲的总通量值和相互通量值来确定解耦通量值，并且基于转子位置确定 至少部分地取决于解耦通量值。

    Techniques for limiting power using an active front end
    9.
    发明授权
    Techniques for limiting power using an active front end 有权

    公开(公告)号：US12142922B2

    公开(公告)日：2024-11-12

    申请号：US17901585

    申请日：2022-09-01

    Applicant: Caterpillar Inc.

    Inventor： Seok-hee Han ,  Jesse R. Gerdes ,  Jackson Wai

    IPC: H02J3/16 ,  H02J7/00 ,  H02J7/34

    Abstract: Techniques to limit electrical power when forming an electrical grid using an active front end unit having an inverter that is coupled to a capacitor (and inductor) that is coupled to an electrical grid. For example, to limit power, the integration of a commanded frequency of the system can be limited to be within a specified phase delta of a measured phase angle of an electrical grid voltage vector. The calculation from power limit to phase delta can be done when the phase of the electrical grid voltage vector has been determined to be accurate and is calculated based on the measured capacitor voltage, grid voltage, and the estimated voltage drop across the output components of the system.

    TECHNIQUES FOR TRANSITIONING BETWEEN CONTROL MODES OF AN ACTIVE FRONT END UNIT
    10.
    发明公开
    TECHNIQUES FOR TRANSITIONING BETWEEN CONTROL MODES OF AN ACTIVE FRONT END UNIT 审中-公开

    公开(公告)号：US20240079870A1

    公开(公告)日：2024-03-07

    申请号：US17901509

    申请日：2022-09-01

    Applicant: Caterpillar Inc.

    Inventor： Seok-hee Han ,  Jesse R. Gerdes ,  Jackson Wai

    IPC: H02J3/00 ,  G05B19/042

    CPC classification number: H02J3/001 ,  G05B19/042 ,  G05B2219/2639

    Abstract: Techniques to reduce discontinuities in power, for example, by controlling an electrical power output of an active front end unit during a transition between a first operating mode and a second operating mode. In some examples, to reduce discontinuities, a control unit of the active front end unit can seed the integrator of proportional-integral (PI) controllers that are brought online during the operating mode change with a value that represents the proper state of the current system, such as the measured or calculated value of the component the PI controller is controlling). In other examples, to reduce discontinuities, a control unit of the active front end unit can control reference frame alignment during a transition between a first operating mode and a second operating mode.

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