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    Techniques for limiting power using an active front end
    1.
    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
    2.
    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.

    CURRENT PROTECTION TO PREVENT OVERCURRENT IN ELECTRICAL GRIDS AND MOTORS
    3.
    发明公开
    CURRENT PROTECTION TO PREVENT OVERCURRENT IN ELECTRICAL GRIDS AND MOTORS 审中-公开

    公开(公告)号：US20230396054A1

    公开(公告)日：2023-12-07

    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.

    Hybrid Soft Switching for Current Regulation in Switched Reluctance Machines
    7.
    发明申请
    Hybrid Soft Switching for Current Regulation in Switched Reluctance Machines 审中-公开
    开关磁阻电机电流调节的混合软开关

    公开(公告)号：US20160248362A1

    公开(公告)日：2016-08-25

    申请号：US14626635

    申请日：2015-02-19

    Applicant: CATERPILLAR INC.

    Inventor： Carlos Nino Baron ,  Ernesto Inoa ,  Jackson Wai ,  Jesse Gerdes ,  Ahmed Khalil

    IPC: H02P25/08

    CPC classification number: H02P25/08 ,  H02P25/089

    Abstract: A method of regulating a phase current of an electric motor is provided. The method may include selectively enabling one or more switches of each phase of the electric motor according to one of at least a soft chopping motoring routine and a soft chopping generating routine, monitoring the phase current relative to a first hysteresis band, controlling the switches according to the soft chopping motoring routine when the phase current exceeds the first hysteresis band while operating according to the soft chopping generating routine, and controlling the switches according to the soft chopping generating routine when the phase current exceeds the first hysteresis band while operating according to the soft chopping motoring routine.

    Abstract translation: 提供一种调节电动机的相电流的方法。 该方法可以包括根据至少软斩波电动程序和软斩波产生程序中的至少一个选择性地启用电动机的每个相的一个或多个开关，监测相对于第一滞后带的相电流，根据 根据软斩波产生程序在相电流超过第一滞后频带的同时，根据软斩波产生程序在相电流超过第一滞后频带时控制开关，同时根据 软斩动作程序。

    Turbine engine hybrid power supply
    8.
    发明授权
    Turbine engine hybrid power supply 有权
    涡轮发动机混合动力电源

    公开(公告)号：US09099882B2

    公开(公告)日：2015-08-04

    申请号：US13745228

    申请日：2013-01-18

    Applicant: Caterpillar Inc.

    Inventor： Bryan Gerard Lammers ,  Daniel Edward Henderson ,  James Allen Roal ,  Jackson Wai

    IPC: B60W20/00 ,  H02J7/00

    CPC classification number: H02J7/007 ,  B60W20/00 ,  B60W20/10 ,  B60W20/19 ,  F01D15/10 ,  F02C6/14 ,  F02C9/26 ,  F05D2270/304 ,  F05D2270/335 ,  Y02T10/44 ,  Y02T10/48 ,  Y02T10/50 ,  Y02T10/52 ,  Y02T10/62 ,  Y02T10/6204 ,  Y02T10/6213 ,  Y02T30/36

    Abstract: A method for controlling a hybrid machine is disclosed. The hybrid machine may be equipped with a turbine engine, a generator connected in series with the turbine engine, an electrical energy storage device, and a motor drivingly connected to a power output component for the hybrid machine. A controller may receive a power demand signal, determine a power level in the electrical energy storage device, determine available inertial energy stored at least in rotating components of the turbine engine and the generator, and provide one or more control signals to selectively control powering the turbine engine to full power, selectively turn off all fuel to the turbine engine, selectively store excess energy as electrical energy by directing excess electrical energy from the generator to the electrical energy storage device, and selectively store excess energy as inertial energy.

    Abstract translation: 公开了一种用于控制混合机的方法。 混合动力机械可以配备有涡轮发动机，与涡轮发动机串联连接的发电机，电能存储装置和驱动地连接到混合动力机械的动力输出部件的电动机。 控制器可以接收功率需求信号，确定电能存储装置中的功率电平，确定至少存储在涡轮发动机和发电机的旋转部件中的可用惯性能量，并提供一个或多个控制信号以选择性地控制对 涡轮发动机到全功率，选择性地关闭所有燃料到涡轮发动机，通过将过量的电能从发电机引导到电能存储装置，选择性地将过量的能量存储为电能，并且选择性地将过量的能量存储为惯性能量。

    Dual generator single DC link configuration for electric drive propulsion system
    9.
    发明授权
    Dual generator single DC link configuration for electric drive propulsion system 有权
    双发电机单直流链路配置电驱动推进系统

    公开(公告)号：US08901760B2

    公开(公告)日：2014-12-02

    申请号：US13752012

    申请日：2013-01-28

    Applicant: Caterpillar Inc.

    Inventor： Jackson Wai ,  Robert R. Sychra ,  Robert W. Lindsey ,  Thomas M. Sopko ,  Bruce H. Hein

    IPC: H02P9/00 ,  B60L11/08

    CPC classification number: B60L11/08 ,  B60L3/0061 ,  B60L3/12 ,  B60L15/20 ,  B60L2200/40 ,  B60L2210/30 ,  B60L2210/40 ,  B60L2240/421 ,  B60L2260/28 ,  Y02T10/645 ,  Y02T10/70 ,  Y02T10/7077 ,  Y02T10/7241 ,  Y02T10/7275

    Abstract: A machine is described that includes an electric drive for propelling the machine along a ground surface. The machine includes an electric power supply system configured to deliver operating electrical power to the electric drive. The electric power system includes a first generator and a second generator. The electric power system also includes a first rectifier coupled to the first generator and having a first direct current (DC) output and a second rectifier coupled to the second generator and having a second DC output. Both the first DC output and the second DC output are coupled to the single DC bus, thereby providing an arrangement for the first rectifier and the second rectifier to simultaneously provide power to the single DC bus. The electrical power system also includes a first inverter/controller coupled to the single DC bus and configured to provide a controlled alternating current to a first motor.

    Abstract translation: 描述了一种机器，其包括用于沿着地面推进机器的电驱动器。 该机器包括被配置为向电驱动器输送工作电力的电力供应系统。 电力系统包括第一发电机和第二发电机。 电力系统还包括耦合到第一发生器并具有第一直流（DC）输出的第一整流器和耦合到第二发生器并具有第二DC输出的第二整流器。 第一直流输出和第二直流输出都耦合到单个直流总线，从而为第一整流器和第二整流器提供同时向单个DC总线提供电力的布置。 电力系统还包括耦合到单个DC总线的第一逆变器/控制器，并且被配置为向第一电动机提供受控的交流电。

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