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1. 发明授权

US10333455B2 System and method for consistent speed regulation in a variable frequency drive 有权
公开(公告)号：US10333455B2
公开(公告)日：2019-06-25
申请号：US15085446
申请日：2016-03-30
申请人： Eaton Corporation
发明人： Xiaomeng Cheng , Huaqiang Li , Peijun Zhu , Dongxiao Wu , Kayle Wang , Qian Zhang
IPC分类号： H02P29/10 , H02P27/08 , G05B19/00 , H02P6/08
摘要： A system and method for speed regulation of a VFD circuit via an anti-windup control scheme that provides consistent speed response with no overshoot is disclosed. A control system for operating the VFD circuit includes a feedback controller programmed to receive a speed of a motor operating responsive to an initial torque command and process the speed of the motor to generate a feedback controller output. A feedforward controller of the control system is programmed to process a speed reference to generate a feedforward controller output. A command module of the control system is programmed to determine a torque command based on the processed outputs of the feedback and feedforward controllers and operate the VFD circuit to control the motor according to the torque command.

2. 发明申请

US20190068097A1 SYSTEM AND METHOD FOR STABILITY CONTROL IN ADJUSTABLE SPEED DRIVE WITH DC LINK THIN FILM CAPACITOR 审中-公开
公开(公告)号：US20190068097A1
公开(公告)日：2019-02-28
申请号：US15692898
申请日：2017-08-31
申请人： Eaton Corporation , Zhejiang University
发明人： Huaqiang Li , Wenxi Yao , Zhentian Qian
IPC分类号： H02P21/05 , H02P21/16 , H02P25/024 , H02P27/12 , G05B19/416
CPC分类号： H02P21/05 , G05B19/416 , G05B2219/49048 , G06F17/13 , H02P21/00 , H02P21/16 , H02P25/024 , H02P27/06 , H02P27/12 , H02P2201/03 , H02P2205/07
摘要： A control system for actively damping an output of an adjustable speed drive (ASD) having a DC link thin film capacitor is programmed to calculate a d-axis damping coefficient and a q-axis damping coefficient for stabilizing an output of the ASD based at least on a voltage across the DC link thin film capacitor at a steady operating point. The control system is further programmed to extract d-axis and q-axis perturbations in d-axis and q-axis output currents of the ASD using a high pass filter, damp the d-axis perturbation and the q-axis perturbation with the d-axis damping coefficient and the q-axis damping coefficient, respectively, and calculate a damping frequency based on the damped d-axis perturbation and the damped q-axis perturbation. The control system is also programmed to damp an angle of rotation of a reference motor speed command for controlling the ASD using the damping frequency.

3. 发明申请

US20180062557A1 SYSTEM AND METHOD FOR CAPACITOR FAULT ENERGY INTERRUPTION IN ADJUSTABLE SPEED DRIVES 有权
公开(公告)号：US20180062557A1
公开(公告)日：2018-03-01
申请号：US15248544
申请日：2016-08-26
申请人： Eaton Corporation
发明人： Tony Tao , Xiaoling Li , Huaqiang Li
IPC分类号： H02P29/024 , H02P27/08 , H02K17/30
CPC分类号： H02P29/024 , H02H1/00 , H02K17/30 , H02M1/00 , H02M1/32 , H02M5/458 , H02M2001/007 , H02M2001/322 , H02P3/22 , H02P27/08 , H02P2201/03
摘要： An adjustable speed drive (ASD) circuit includes a rectifier bridge to convert an AC power input to a DC power, a DC link coupled to the rectifier bridge to receive the DC power, a DC link capacitor bank comprising at least first and second capacitors connected to the DC link, each capacitor having a capacitor voltage thereacross, and a protection circuit including a detection circuit configured to detect a short circuit on one or more of the first and second capacitors of the DC link capacitor bank and generate an action signal upon detection of a short circuit on one or more of the first and second capacitors of the DC link capacitor bank. The ASD circuit also includes an action circuit in operable communication with the detection circuit and configured to cause a short circuit across the DC link upon receiving the action signal from the detection circuit.

4. 发明授权

US09024569B2 System and method of rotor time constant online identification in an AC induction machine 有权
标题翻译：交流感应电机的转子时间常数在线识别系统及方法
公开(公告)号：US09024569B2
公开(公告)日：2015-05-05
申请号：US13929914
申请日：2013-06-28
申请人： Eaton Corporation
发明人： Kai Wang , Wenxi Yao , Huaqiang Li , Zhengyu Lu
IPC分类号： H02P23/00 , H02P21/14
CPC分类号： H02P21/08 , H02P21/13 , H02P21/16
摘要： A system and method for determining a rotor time constant of an AC induction machine is disclosed. During operation of the induction motor, a flux signal is injected into a rotor flux command so as to generate a time-variant rotor flux. A voltage-current flux observer determines amplitudes of rotor flux variations resulting from the time-variant rotor flux, with the amplitudes of the rotor flux variations comprising an amplitude of a rotor flux variation based on a current model of the voltage-current flux observer and an amplitude of a rotor flux variation based on a combined voltage-current model of the voltage-current flux observer. A rotor time constant of the induction motor is then estimated based on the determined amplitudes of the rotor flux variations.
摘要翻译：公开了一种用于确定AC感应电机的转子时间常数的系统和方法。在感应电动机的操作期间，将磁通信号注入到转子磁通指令中，以产生时变转子磁通。电压 - 电流通量观测器确定由时变转子磁通产生的转子磁通变化的幅度，转子磁通量变化的幅度基于电压 - 电流通量观测器的当前模型，包括转子磁通量变化的幅度，以及基于电压 - 电流通量观测器的组合电压 - 电流模型的转子磁通量变化幅度。然后基于所确定的转子磁通变化的幅度来估计感应电动机的转子时间常数。

5. 发明申请

US20150002072A1 SYSTEM AND METHOD FOR CONTROLLING REGENERATING ENERGY IN AN ADJUSTABLE SPEED DRIVE 有权
公开(公告)号：US20150002072A1
公开(公告)日：2015-01-01
申请号：US13931121
申请日：2013-06-28
申请人： Eaton Corporation
发明人： Yaojin Mo , Huaqiang Li , Anbo Yu , Dawei Li , Jingfeng Xie
IPC分类号： H02P23/00
CPC分类号： H02P27/06 , H02M2007/53876 , H02P3/18 , H02P21/0021 , H02P23/00 , H02P23/20 , H02P23/28 , H02P27/047 , H02P29/0241
摘要： A system and method for controlling an adjustable speed drive (ASD) to decelerate an AC load during a generating mode of operation is disclosed. The ASD includes a capacitor and an inverter coupled to a DC link. A current sensor system is coupled to an output of the inverter. The ASD further includes a control system programmed to calculate an energy of the capacitor, generate a reference power using the calculated capacitor energy, and calculate a feedback power from realtime current signals received from the current sensor system. The control system compares the feedback power to the reference power, defines a frequency offset based on the comparison, generates a speed command using the frequency offset, and outputs the speed command to the inverter to maintain a smooth DC link voltage during deceleration.

6. 发明申请

US20190199085A1 MOTOR CONTROL SYSTEM WITH INTEGRATED SOLID-STATE CONTACTOR AND RELAYS AND METHOD OF OPERATION THEREOF 审中-公开
公开(公告)号：US20190199085A1
公开(公告)日：2019-06-27
申请号：US15854118
申请日：2017-12-26
申请人： Eaton Corporation
发明人： Huaqiang Li , Joseph Paul Uphaus
IPC分类号： H02H7/122 , H02P27/06 , H02M7/00 , H02P3/18 , H02P27/02 , H02M7/5387 , H02M1/32 , H02M5/458
CPC分类号： H02H7/1225 , H02H3/033 , H02H3/06 , H02H3/162 , H02M1/32 , H02M5/4585 , H02M7/003 , H02M7/53871 , H02P1/28 , H02P1/30 , H02P3/18 , H02P27/026 , H02P27/06
摘要： A motor control system includes a motor switching assembly comprising a power converter positioned on a converter path, a first relay positioned on the converter path upstream of the power converter, a second relay positioned on a bypass path that is in parallel with the converter path, and a solid-state switching unit positioned upstream from the converter path and the bypass path. The motor control system also includes a control system that controls operation of the motor switching assembly, with the control system programmed to operate the solid-state switching unit in one of a conducting mode, a non-conducting mode, and a ramping mode, so as to selectively control and condition power flow therethrough. The control system is also programmed to control switching of the first and second relays between open and closed positions to selectively route power along the converter path or the bypass path.

7. 发明授权

US10333444B2 System and method for stability control in adjustable speed drive with DC link thin film capacitor 有权
公开(公告)号：US10333444B2
公开(公告)日：2019-06-25
申请号：US15692898
申请日：2017-08-31
申请人： Eaton Corporation , Zhejiang University
发明人： Huaqiang Li , Wenxi Yao , Zhentian Qian
IPC分类号： H02P21/05 , H02P21/16 , H02P25/024 , H02P27/12 , G05B19/416 , G06F17/13
摘要： A control system for actively damping an output of an adjustable speed drive (ASD) having a DC link thin film capacitor is programmed to calculate a d-axis damping coefficient and a q-axis damping coefficient for stabilizing an output of the ASD based at least on a voltage across the DC link thin film capacitor at a steady operating point. The control system is further programmed to extract d-axis and q-axis perturbations in d-axis and q-axis output currents of the ASD using a high pass filter, damp the d-axis perturbation and the q-axis perturbation with the d-axis damping coefficient and the q-axis damping coefficient, respectively, and calculate a damping frequency based on the damped d-axis perturbation and the damped q-axis perturbation. The control system is also programmed to damp an angle of rotation of a reference motor speed command for controlling the ASD using the damping frequency.

8. 发明申请

US20190089146A1 SOFT-STARTER AC-AC CONVERTER WITH INTEGRATED SOLID-STATE CIRCUIT BREAKER AND METHOD OF OPERATION THEREOF 审中-公开
公开(公告)号：US20190089146A1
公开(公告)日：2019-03-21
申请号：US15711152
申请日：2017-09-21
申请人： Eaton Corporation
发明人： Huaqiang Li , Kaijam M. Woodley
IPC分类号： H02H7/085 , H02H7/08 , H02H7/09 , H02M5/293 , H03K17/567 , H02P25/16 , H02H9/00
摘要： An AC-AC power converter, such as a motor soft starter, includes an input connectable to an AC source with a disconnect switch, an output connectable to an AC load, and phase lines connecting the input and output to transmit power. In-line solid-state switching blocks are connected between line terminals and load terminals of the AC source and AC load, respectively, such that each phase line includes a solid-state switching block connected thereto. Free-wheeling solid-state switching blocks are connected to the load terminals at one end and together at a common connection at another end, such that each phase line includes a free-wheeling solid-state switching block connected thereto. Each of the in-line and free-wheeling solid-state switching blocks comprises a bi-directional switching block that selectively controls current and withstands voltage in both directions. The switching blocks also provide soft-starter functions, variable speed control, and integrated circuit breaker protection capability.

9. 发明申请

US20150002071A1 SYSTEM AND METHOD OF ROTOR TIME CONSTANT ONLINE IDENTIFICATION IN AN AC INDUCTION MACHINE 有权
标题翻译：转子时间的系统与方法在交流感应电机中的在线识别
公开(公告)号：US20150002071A1
公开(公告)日：2015-01-01
申请号：US13929914
申请日：2013-06-28
申请人： Eaton Corporation
发明人： Kai Wang , Wenxi Yao , Huaqiang Li , Zhengyu Lu
IPC分类号： H02P21/14
CPC分类号： H02P21/08 , H02P21/13 , H02P21/16
摘要： A system and method for determining a rotor time constant of an AC induction machine is disclosed. During operation of the induction motor, a flux signal is injected into a rotor flux command so as to generate a time-variant rotor flux. A voltage-current flux observer determines amplitudes of rotor flux variations resulting from the time-variant rotor flux, with the amplitudes of the rotor flux variations comprising an amplitude of a rotor flux variation based on a current model of the voltage-current flux observer and an amplitude of a rotor flux variation based on a combined voltage-current model of the voltage-current flux observer. A rotor time constant of the induction motor is then estimated based on the determined amplitudes of the rotor flux variations.
摘要翻译：公开了一种用于确定AC感应电机的转子时间常数的系统和方法。在感应电动机的操作期间，将磁通信号注入到转子磁通指令中，以产生时变转子磁通。电压 - 电流通量观测器确定由时变转子磁通产生的转子磁通变化的幅度，转子磁通量变化的幅度基于电压 - 电流通量观测器的当前模型，包括转子磁通量变化的幅度，以及基于电压 - 电流通量观测器的组合电压 - 电流模型的转子磁通量变化幅度。然后基于所确定的转子磁通变化的幅度来估计感应电动机的转子时间常数。

10. 发明申请

US20140233278A1 SYSTEM AND METHOD FOR SINGLE-PHASE AND THREE-PHASE CURRENT DETERMINATION IN POWER CONVERTERS AND INVERTERS 有权
标题翻译：电源转换器和逆变器的单相和三相电流确定的系统和方法
公开(公告)号：US20140233278A1
公开(公告)日：2014-08-21
申请号：US13768418
申请日：2013-02-15
申请人： EATON CORPORATION
发明人： Huaqiang Li , Yakov Lvovich Familiant , Xiaoling Li
IPC分类号： H02M5/458
CPC分类号： H02M7/53873 , H02M5/458 , H02M2001/0009
摘要： A system and method for capturing current information for a power converter is disclosed. The current monitoring system includes a control system operably connected to a circuit having a plurality of semiconductor switches that are controllable to convert an input power to an output power having a desired voltage and current. The control system includes a PWM signal generator to generate switching signals that control switching of the switches, gate drivers to facilitate switching of the switches, and desaturation circuits to provide overcurrent protection to the switches. The control system further includes a processor that receives voltage data from the desaturation circuits regarding a measured voltage across each of the switches, determines a current through each of the switches based on the voltage across each respective switch, and calculates an input current to the circuit or an output current of the circuit based on the determined currents through the switches.
摘要翻译：公开了一种用于捕获功率转换器的当前信息的系统和方法。电流监视系统包括可操作地连接到具有多个半导体开关的电路的控制系统，所述多个半导体开关可被控制以将输入功率转换为具有期望的电压和电流的输出功率。该控制系统包括一个PWM信号发生器，用于产生开关信号，该开关信号控制开关的开关，栅极驱动器以便于开关的切换，以及去饱和电路，为开关提供过流保护。控制系统还包括处理器，其从去饱和电路接收关于每个开关上的测量电压的电压数据，基于每个开关上的电压确定通过每个开关的电流，并且计算到电路的输入电流或基于通过开关确定的电流的电路的输出电流。

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