公开(公告)号：US20110309875A1

公开(公告)日：2011-12-22

申请号：US12818895

申请日：2010-06-18

Applicant: Lixiang Wei ,  Russel J. Kerkman ,  Richard A. Lukaszewski ,  Haihui Lu ,  Zhenhuan Yuan

Inventor： Lixiang Wei ,  Russel J. Kerkman ,  Richard A. Lukaszewski ,  Haihui Lu ,  Zhenhuan Yuan

IPC: H03K17/60

CPC classification number: H02M7/537 ,  G01B3/52 ,  G05F1/67 ,  H02M1/32 ,  H02P9/007

Abstract: The present techniques include methods and systems for operating converter to maintain a lifespan of the converter. In some embodiments, the operating frequency of the converter may be increased such that stress may be reduced on the bond wires of the converter. More specifically, embodiments involve calculating the aging parameters for certain operating conditions of the converter operating in a maximum power point tracking (MPPT) mode and determining whether the MPPT operation results in aging the converter to a point which reduces the converter lifespan below a desired lifespan. If the MPPT operation reduces the converter lifespan below the desired lifespan, the frequency of the converter may be increased such that the converter may be controlled to operate at a percentage of MPPT. Thus, in some embodiments, power output may be optimized with respect to maintaining a desired lifespan of the converter.

Abstract translation: 本技术包括用于操作转换器以保持转换器寿命的方法和系统。 在一些实施例中，可以增加转换器的工作频率，使得可以在转换器的接合线上减小应力。 更具体地，实施例涉及为以最大功率点跟踪（MPPT）模式操作的转换器的某些操作条件计算老化参数，并且确定MPPT操作是否导致转换器老化到将转换器寿命降低到期望寿命以下的点 。 如果MPPT操作将转换器寿命降低到期望的寿命以下，则可以增加转换器的频率，使得可以将转换器控制为以MPPT的百分比进行操作。 因此，在一些实施例中，可以相对于维持转换器的期望寿命来优化功率输出。

公开(公告)号：US20110295437A1

公开(公告)日：2011-12-01

申请号：US12789285

申请日：2010-05-27

Applicant: Haihui Lu ,  Lixiang Wei ,  Richard A. Lukaszewski ,  Russel J. Kerkman ,  Zhenhuan Yuan

Inventor： Haihui Lu ,  Lixiang Wei ,  Richard A. Lukaszewski ,  Russel J. Kerkman ,  Zhenhuan Yuan

IPC: H02P9/04 ,  G06F1/28

CPC classification number: H02P9/105 ,  H02J3/386 ,  H02J3/50 ,  H02M5/4585 ,  H02P9/007 ,  H02P2101/15

Abstract: The present techniques include methods and systems for operating a wind power system to maintain a lifespan of the rotor side converter. In some embodiments, the current of the rotor side converter may be minimized to reduce the stress and/or junction temperature variation in the switching transistors and bond wires of the converter. More specifically, embodiments involve using a minimal current in the rotor side converter based on the rotor side and grid side reactive powers. If the grid side reactive power is greater than a maximum grid side reactive power, the grid side reactive power may be reduced. Further, if the total reactive power does not meet the grid reactive power requirements, the minimal current in the rotor side converter may be adjusted such that the system may sufficiently power the grid.

Abstract translation: 本技术包括用于操作风力发电系统以维持转子侧转换器的寿命的方法和系统。 在一些实施例中，转子侧转换器的电流可以最小化，以减小转换器的开关晶体管和接合线中的应力和/或结温变化。 更具体地，实施例涉及在转子侧转换器中基于转子侧和电网侧无功功率使用最小电流。 如果电网侧无功功率大于最大电网侧的无功功率，则电网侧的无功功率可能会降低。 此外，如果总无功功率不满足电网无功功率要求，则可以调节转子侧转换器中的最小电流，使得系统可以对电网充分供电。

公开(公告)号：US20110102012A1

公开(公告)日：2011-05-05

申请号：US12611719

申请日：2009-11-03

Applicant: David M. Messersmith ,  Douglas J. Bader ,  Haihui Lu ,  Thomas A. Nondahl ,  Zhenhuan Yuan

Inventor： David M. Messersmith ,  Douglas J. Bader ,  Haihui Lu ,  Thomas A. Nondahl ,  Zhenhuan Yuan

IPC: G01R31/34 ,  G01R27/00

CPC classification number: G01R31/343 ,  G01R27/08 ,  G01R27/2611 ,  H02P23/14

Abstract: A method of estimating stator resistance of an induction motor is provided. The method includes applying voltage pulses through two phase paths of the motor for a plurality of electrical cycles to inject current in the motor, wherein the voltage pulses are applied until rotor flux of the motor is substantially stabilized and measuring stator voltage and stator current in response to the applied voltage pulses for each of the plurality of electrical cycles. The method also includes calculating the stator resistance based upon the measured stator voltages and the stator currents.

Abstract translation: 提供了一种估计感应电动机的定子电阻的方法。 该方法包括通过电动机的两个相位路径施加电压脉冲多个电循环以在电动机中注入电流，其中施加电压脉冲直到电动机的转子磁通基本稳定并且响应于测量定子电压和定子电流 对于多个电循环中的每一个的施加的电压脉冲。 该方法还包括基于所测量的定子电压和定子电流来计算定子电阻。

公开(公告)号：US07538507B2

公开(公告)日：2009-05-26

申请号：US11741728

申请日：2007-04-28

Applicant: Haihui Lu ,  Thomas A. Nondahl ,  David M. Messersmith

Inventor： Haihui Lu ,  Thomas A. Nondahl ,  David M. Messersmith

IPC: G01P3/00

CPC classification number: H02P6/185 ,  H02P6/182 ,  H02P23/20

Abstract: Control systems and speed estimation systems are presented having a transient-based speed estimation system that provides a rotor speed estimate based on a measured speed-related motor transient signal, and a transient excitation system which selectively modifies at least one switch control signal to excite the measured motor transient.

Abstract translation: 提出了具有基于瞬态的速度估计系统的控制系统和速度估计系统，其基于所测量的与速度相关的电机瞬态信号提供转子速度估计，以及瞬态激励系统，其选择性地修改至少一个开关控制信号以激励 测量电机瞬态。

公开(公告)号：US07227326B1

公开(公告)日：2007-06-05

申请号：US11379887

申请日：2006-04-24

Applicant: Haihui Lu ,  Thomas A. Nondahl ,  David M. Messersmith

Inventor： Haihui Lu ,  Thomas A. Nondahl ,  David M. Messersmith

IPC: G01P3/00

CPC classification number: H02P6/185 ,  H02P6/182 ,  H02P23/20

Abstract: AC motor control systems and speed controllers are presented, including a transient-based speed estimation system that provides a rotor speed estimate based on a measured speed-related motor transient signal, and a transient excitation system which selectively modifies at least one switch control signal to excite the measured motor transient. The measured speed-related transient may include a phase error signal, a phase lag signal, a peak current signal, a voltage integral signal, a motor winding voltage signal, a switching device voltage, and a voltage zero crossing signal, and the switching signal modification can comprise removal of select pulse(s) from a switching control pulse stream or selective modification of spacings between pulses to re-excite the motor transient.

Abstract translation: 提出了交流电动机控制系统和速度控制器，其包括基于瞬态的速度估计系统，其基于测量的与速度相关的电动机瞬态信号提供转子速度估计，以及瞬态激励系统，其选择性地修改至少一个开关控制信号 激发测量的电机瞬态。 测量的速度相关瞬态可以包括相位误差信号，相位滞后信号，峰值电流信号，电压积分信号，电机绕组电压信号，开关器件电压和电压过零信号，以及开关信号 修改可以包括从开关控制脉冲流中去除选择脉冲或者选择性地修改脉冲之间的间隔以重新激发电机瞬态。

公开(公告)号：US07193387B1

公开(公告)日：2007-03-20

申请号：US11375800

申请日：2006-03-14

Applicant: Haihui Lu ,  Wei Qian

Inventor： Haihui Lu ,  Wei Qian

IPC: H02P1/26

CPC classification number: H02P21/0021 ,  H02P21/0017 ,  H02P21/141 ,  H02P21/18 ,  H02P21/20 ,  H02P21/26 ,  H02P21/32 ,  H02P21/34 ,  H02P31/00 ,  H02P2203/05 ,  H02P2203/09 ,  H02P2207/01 ,  Y10S388/906 ,  Y10S388/917

Abstract: Motor drives, motor speed controllers, motor speed estimation systems, and methods are presented for controlling motor startup speed and for estimating motor speed during startup, in which a speed estimate controller provides a rotor speed estimate based on a first error term from a torque-based MRAS component for a first range of motor speeds and based on a second error term from a rotor flux-based MRAS component for a second range of speeds.

Abstract translation: 提出了电动机驱动器，电动机速度控制器，电动机速度估计系统和方法，用于控制电动机起动速度和用于估计启动期间的电动机速度，其中速度估计控制器基于来自转矩 - 转速的第一误差项提供转子速度估计， 基于用于第一范围的电动机速度的MRAS组件，并且基于来自用于第二速度范围的基于转子磁通的MRAS分量的第二误差项。

公开(公告)号：US07164254B2

公开(公告)日：2007-01-16

申请号：US11068323

申请日：2005-02-28

Applicant: Russel J. Kerkman ,  Qiang Yin ,  Haihui Lu

Inventor： Russel J. Kerkman ,  Qiang Yin ,  Haihui Lu

IPC: H02P3/18

CPC classification number: H02M7/48 ,  H02M1/44 ,  H02M2001/123

Abstract: Methods and apparatus for reducing the common mode voltage generated by eliminating zero-voltage vectors in a rectifier/inverter variable frequency drive (VFD) system includes comparing three phase voltages to each other to determine a maximum voltage in one phase, a minimum voltage in another phase and a middle voltage in still another phase, inverting phase voltages for one phase having the maximum voltage and another phase having the minimum voltage, comparing the phase voltages to a carrier wave to determine gating signals for three respective phases of the inverter, and inverting gating signals for the one phase having the maximum voltage and for another phase having the minimum voltage to reduce the common mode voltage in the motor. In one embodiment, the zero-voltage vectors are removed by relating a first plurality of gating signals and a plurality of sector logic signals in a logic table to a second plurality of gating signals that are applied to phases of the inverter

Abstract translation: 整流/变频变频驱动（VFD）系统中消除零电压矢量产生的共模电压的方法和装置包括将三相电压相互比较，以确定一相中的最大电压，另一相中的最小电压 相位和另一相的中间电压，将具有最大电压的一相的相位相电压和具有最小电压的另一相相比较，将相电压与载波进行比较，以确定逆变器的三个相位的门控信号，以及反相 具有最大电压的一相的门控信号以及具有最小电压的另一相位以降低电动机中的共模电压。 在一个实施例中，通过将逻辑表中的第一多个选通信号和多个扇区逻辑信号与施加到反相器的相位的第二多个选通信号相关联来消除零电压矢量