公开(公告)号：US20160126861A1

公开(公告)日：2016-05-05

申请号：US14527804

申请日：2014-10-30

Applicant: Rockwell Automation Technologies, Inc.

Inventor： Lixiang Wei ,  Jeffrey D. McGuire ,  Timothy M. Rowan

IPC: H02M7/537

CPC classification number: H02M7/537 ,  H02M5/4585 ,  H02M7/53875 ,  H02P27/08 ,  H03K3/017

Abstract: Methods, control apparatus and computer readable mediums are presented for controlling a switching inverter in which a controller selectively suspends PWM carrier signals to provide inverter switching control signals using zero vectors in response to a maximal pulse width value for a present PWM half cycle being greater than a threshold value, and accumulates a present output control value for individual output phases for use in a subsequent PWM half cycle for selective effective reduction in switching frequency for low-speed operation while maintaining high frequency control loop sampling.

Abstract translation: 提出了用于控制开关逆变器的方法，控制装置和计算机可读介质，其中控制器选择性地暂停PWM载波信号，以响应于当前PWM半周期的最大脉冲宽度值大于0而使用零向量来提供逆变器切换控制信号 并且累积用于各个输出相位的当前输出控制值，以用于随后的PWM半周期，用于在保持高频控制环路采样的同时选择性有效地降低用于低速操作的开关频率。

公开(公告)号：US20190204374A1

公开(公告)日：2019-07-04

申请号：US15861886

申请日：2018-01-04

Applicant: Rockwell Automation Technologies, Inc.

Inventor： Lixiang Wei ,  Jiangang Hu ,  Jeffrey D. McGuire

IPC: G01R31/02 ,  H02H7/08 ,  G06F17/11

Abstract: A method and controller to automatically determine a grounding condition of a motor drive, in which an inverter is operated at a predetermined frequency while a load resistor is connected between a single phase of a motor drive inverter output and a reference node, a leakage flux linkage value is computed according to a neutral-ground voltage of the motor drive, and a processor determines whether the motor drive is solid grounded, high-resistance grounded, or floating according to the leakage flux linkage value. In certain examples, the processor automatically turns the inverter off while the load resistor is connected between the single phase of the inverter output and the reference node, and automatically determines whether the motor drive is delta corner grounded according to the neutral-ground voltage.

公开(公告)号：US09318976B1

公开(公告)日：2016-04-19

申请号：US14527804

申请日：2014-10-30

Applicant: Rockwell Automation Technologies, Inc.

Inventor： Lixiang Wei ,  Jeffrey D. McGuire ,  Timothy M. Rowan

IPC: H02M1/14 ,  H02M7/537

CPC classification number: H02M7/537 ,  H02M5/4585 ,  H02M7/53875 ,  H02P27/08 ,  H03K3/017

Abstract: Methods, control apparatus and computer readable mediums are presented for controlling a switching inverter in which a controller selectively suspends PWM carrier signals to provide inverter switching control signals using zero vectors in response to a maximal pulse width value for a present PWM half cycle being greater than a threshold value, and accumulates a present output control value for individual output phases for use in a subsequent PWM half cycle for selective effective reduction in switching frequency for low-speed operation while maintaining high frequency control loop sampling.

Abstract translation: 提出了用于控制开关逆变器的方法，控制装置和计算机可读介质，其中控制器选择性地暂停PWM载波信号，以响应于当前PWM半周期的最大脉冲宽度值大于0而使用零向量来提供逆变器切换控制信号 并且累积用于各个输出相位的当前输出控制值，以用于随后的PWM半周期，用于在保持高频控制环路采样的同时选择性有效地降低用于低速操作的开关频率。

公开(公告)号：US10725116B2

公开(公告)日：2020-07-28

申请号：US15861886

申请日：2018-01-04

Applicant: Rockwell Automation Technologies, Inc.

Inventor： Lixiang Wei ,  Jiangang Hu ,  Jeffrey D. McGuire

IPC: H02P29/024 ,  G01R31/50 ,  G06F17/11 ,  H02H7/08

Abstract: A method and controller to automatically determine a grounding condition of a motor drive, in which an inverter is operated at a predetermined frequency while a load resistor is connected between a single phase of a motor drive inverter output and a reference node, a leakage flux linkage value is computed according to a neutral-ground voltage of the motor drive, and a processor determines whether the motor drive is solid grounded, high-resistance grounded, or floating according to the leakage flux linkage value. In certain examples, the processor automatically turns the inverter off while the load resistor is connected between the single phase of the inverter output and the reference node, and automatically determines whether the motor drive is delta corner grounded according to the neutral-ground voltage.

公开(公告)号：US10302688B2

公开(公告)日：2019-05-28

申请号：US15410000

申请日：2017-01-19

Applicant: Rockwell Automation Technologies, Inc.

Inventor： Jiangang Hu ,  Zhijun Liu ,  Jeffrey D. McGuire ,  Lixiang Wei

IPC: G01R27/18 ,  G01R31/02 ,  G01R31/40 ,  B60L3/00 ,  B60L3/04 ,  B60L3/12 ,  G01R31/08 ,  H02H3/16 ,  H02H7/12

Abstract: Power conversion systems, disclosed examples include power conversion systems, ground fault detection apparatus and methods to detect and identify ground faults in a power conversion system using AC coupling to sense a system voltage to determine a leakage flux linkage, and to identify a faulted converter phase based on a phase shift angle of the leakage flux linkage.

公开(公告)号：US20170131341A1

公开(公告)日：2017-05-11

申请号：US15410000

申请日：2017-01-19

Applicant: Rockwell Automation Technologies, Inc.

Inventor： Jiangang Hu ,  Zhijun Liu ,  Jeffrey D. McGuire ,  Lixiang Wei

IPC: G01R31/02 ,  G01R31/40

CPC classification number: G01R31/025 ,  B60L3/0069 ,  B60L3/04 ,  B60L3/12 ,  B60L2220/42 ,  G01R31/086 ,  G01R31/40 ,  H02H3/16 ,  H02H7/1216 ,  Y02T10/646

Abstract: Power conversion systems, disclosed examples include power conversion systems, ground fault detection apparatus and methods to detect and identify ground faults in a power conversion system using AC coupling to sense a system voltage to determine a leakage flux linkage, and to identify a faulted converter phase based on a phase shift angle of the leakage flux linkage.

公开(公告)号：US09383399B2

公开(公告)日：2016-07-05

申请号：US14043065

申请日：2013-10-01

Applicant: ROCKWELL AUTOMATION TECHNOLOGIES, INC.

Inventor： Lixiang Wei ,  Jiangang Hu ,  Jeffrey D. McGuire

IPC: G01R31/14 ,  G01R31/02 ,  G01R31/42

CPC classification number: G01R31/025 ,  G01R31/42

Abstract: A HRG ground fault detector and method for detecting a ground fault in a High Resistance Ground (HRG) system are provided. The HRG ground fault detector in one example embodiment includes a first input A coupled to a first phase PHA of the HRG system, a second input B coupled to a second phase PHB, and a third input C coupled to a third phase PHC, with the HRG ground fault detector generating a simulated neutral voltage VN′ from the first phase PHA, the second phase PHB, and the third phase PHC. The simulated neutral voltage VN′ has a zero voltage potential when the first phase PHA, the second phase PHB, and the third phase PHC are equal. The HRG ground fault detector further compares the simulated neutral voltage VN′ to a predetermined fault voltage threshold, and detects a HRG ground fault if the simulated neutral voltage VN′ exceeds the threshold.

Abstract translation: 提供了一种用于检测高阻地（HRG）系统中的接地故障的HRG接地故障检测器和方法。 一个示例性实施例中的HRG接地故障检测器包括耦合到HRG系统的第一相PHA的第一输入A，耦合到第二相PHB的第二输入B和耦合到第三相PHC的第三输入C， HRG接地故障检测器从第一相PHA，第二相PHB和第三相PHC产生模拟中性点电压VN'。 当第一相PHA，第二相PHB和第三相PHC相等时，模拟中性点电压VN'具有零电压电位。 HRG接地故障检测器还将模拟中性点电压VN'与预定的故障电压阈值进行比较，并且如果模拟中性点电压VN'超过阈值，则检测HRG接地故障。

公开(公告)号：US20150091582A1

公开(公告)日：2015-04-02

申请号：US14043065

申请日：2013-10-01

Applicant: ROCKWELL AUTOMATION TECHNOLOGIES, INC.

Inventor： Lixiang Wei ,  Jiangang Hu ,  Jeffrey D. McGuire

IPC: G01R31/02

CPC classification number: G01R31/025 ,  G01R31/42

Abstract: A HRG ground fault detector and method for detecting a ground fault in a High Resistance Ground (HRG) system are provided. The HRG ground fault detector in one example embodiment includes a first input A coupled to a first phase PHA of the HRG system, a second input B coupled to a second phase PHB, and a third input C coupled to a third phase PHC, with the HRG ground fault detector generating a simulated neutral voltage VN′ from the first phase PHA, the second phase PHB, and the third phase PHC, wherein the simulated neutral voltage VN′ comprises a zero voltage potential when the first phase PHA, the second phase PHB, and the third phase PHC are equal, comparing the simulated neutral voltage VN′ to a predetermined fault voltage threshold, and detecting a HRG ground fault if the simulated neutral voltage VN′ exceeds the threshold.

Abstract translation: 提供了一种用于检测高阻地（HRG）系统中的接地故障的HRG接地故障检测器和方法。 一个示例性实施例中的HRG接地故障检测器包括耦合到HRG系统的第一相PHA的第一输入A，耦合到第二相PHB的第二输入B和耦合到第三相PHC的第三输入C， HRG接地故障检测器从第一相位PHA，第二相位PHB和第三相位PHC产生模拟中性点电压VN'，其中模拟中性点电压VN'包括当第一相位PHA，第二相位PHB ，并且第三相PHC相等，将模拟中性点电压VN'与预定故障电压阈值进行比较，并且如果模拟中性点电压VN'超过阈值则检测HRG接地故障。