Control for bumpless transfer of an AC motor between a solid-state
inverter and a supply mains
    1.
    发明授权
    Control for bumpless transfer of an AC motor between a solid-state inverter and a supply mains 失效
    控制在固态逆变器和电源之间的交流电机的无扰动传输

    公开(公告)号:US4587474A

    公开(公告)日:1986-05-06

    申请号:US626712

    申请日:1984-07-02

    CPC分类号: H02J3/40

    摘要: A power conditioner having a source and load converter each using a phase-locked loop to control their respective converter firings achieves synchronization with a supply mains by determining the phase error between supply mains and motor voltages by obtaining the instantaneous difference between the output signals of the source and load phase locked loops. This phase error is passed through a simple gain and summed with a speed regulator setpoint, which now becomes an inverter frequency regulator with the nominal setpoint being the supply mains frequency. The voltage amplitude error between the supply mains and the motor is obtained by comparing the absolute value of the source voltage with the properly scaled absolute value of the integrated motor voltage and this error signal is input to the flux regulator in a synchronous or induction motor controller in place of the normal input when not synchronizing.

    摘要翻译: 具有源和负载转换器的功率调节器,每个使用锁相环来控制它们各自的转换器启动,通过确定电源和电动机电压之间的相位误差来获得与供电电源的同步,从而获得 源和负载锁相环。 该相位误差通过简单增益传递,并与速度调节器设定值相加,调速器设定值现在变为变频器频率调节器,标称设定值为供电电源频率。 通过将源电压的绝对值与积分电动机电压的适当比例的绝对值进行比较,得到电源和电动机之间的电压幅度误差,该误差信号输入到同步或异步电动机控制器中的通量调节器 代替正常输入时不同步。

    Twelve pulse load commutated inverter drive system
    2.
    发明授权
    Twelve pulse load commutated inverter drive system 失效
    十二脉冲负载换向变频驱动系统

    公开(公告)号:US4426611A

    公开(公告)日:1984-01-17

    申请号:US372749

    申请日:1982-04-28

    摘要: A control system for powering an AC load such as a polyphase synchronous motor having at least two sets of three phase (3.phi.) windings. Each three phase winding set is powered by an independently operable six pulse load commutated inverter drive including a source side converter and a load side converter coupled together by means of a DC link and wherein the source side converter and the load side converter are operated in accordance with respective current and load angle regulators which respond to torque command signals generated by speed regulators. The two motor drives operate concurrently in separate control channels which are substantially independent of one another with the exception that in one embodiment, which is the preferred embodiment, the speed regulator and the motor terminal overvoltage regulator are cross-coupled to effect a balanced torque command and motor terminal voltage from each channel while still providing for continued motor operation by one of the motor drive channels in the event that the other becomes inoperative for any reason. In a second embodiment, one of two redundant speed regulators is adapted to provide a common torque command to both channels with the other speed regulator taking over in the event of the failure of said one speed regulator.

    摘要翻译: 一种用于为诸如具有至少两组三相(3phi)绕组的多相同步电动机的交流负载供电的控制系统。 每个三相绕组由一个可独立操作的六个脉冲负载换向逆变器驱动器供电,该驱动器包括通过直流链路耦合在一起的源极侧转换器和负载侧转换器,其中源侧转换器和负载侧转换器按照 具有响应由调速器产生的转矩指令信号的各自的电流和负载角调节器。 两个电动机驱动器在独立的控制通道中同时运行,这些控制通道基本上彼此独立,除了在一个实施例中,优选实施例中,速度调节器和电动机端子过电压调节器交叉耦合以实现平衡转矩指令 并且每个通道的电动机端子电压同时由于任何原因而在另一个电机驱动通道不能工作的情况下继续由马达驱动通道运行。 在第二实施例中,两个冗余速度调节器中的一个适于在两个通道中提供公共转矩指令,而另一个调速器在所述一个速度调节器发生故障的情况下接管。

    Flux feedback firing control for a load commutated inverter
    3.
    发明授权
    Flux feedback firing control for a load commutated inverter 失效
    负载换向逆变器的通量反馈点火控制

    公开(公告)号:US4449087A

    公开(公告)日:1984-05-15

    申请号:US333933

    申请日:1981-12-23

    IPC分类号: H02P25/02 H02P5/40

    CPC分类号: H02P25/024 H02P2201/13

    摘要: A load commutated inverter synchronous motor drive system wherein a thyristor firing control of the inverter is determined by the amplitude of pesudo flux waveforms which are derived from the integral of the line voltages coupling the inverter to the motor being driven. A firing strategy is provided based on the premise that optimum thyristor firing in a load commutated inverter operating at a leading power factor occurs at a point just below the peak of the forthcoming pseudo flux waveform which point comprises an amount of volt-seconds necessary to effect current commutation plus a nominal safety margin. The determination and control is implemented, preferably, in a software phase lock loop but can, when desirable, be implemented in hardware.

    摘要翻译: 一种负载换向的逆变器同步电动机驱动系统,其中逆变器的晶闸管点火控制由从耦合到所驱动的电动机的线路电压的积分导出的pesudo通量波形的幅度确定。 基于这样的前提提供了一种点火策略,即在刚刚低于即将到来的伪通量波形的峰值的点处的负载换向逆变器中以最佳功率因数工作的最佳晶闸管点火发生在该点包括所需的伏秒的量 当前换向加上名义上的安全幅度。 确定和控制优选地在软件锁相环中实现,但是当期望地可以在硬件中实现时。

    Phase-locked loop control of an induction motor drive
    4.
    发明授权
    Phase-locked loop control of an induction motor drive 失效
    感应电动机驱动器的锁相环控制

    公开(公告)号:US4562396A

    公开(公告)日:1985-12-31

    申请号:US626999

    申请日:1984-07-02

    IPC分类号: H02P27/06 H02P21/08 H02P5/40

    CPC分类号: H02P21/08

    摘要: A controlled current inverter (CCI) induction motor drive is controlled by controlling motor current and the angle between motor flux and motor current. The angle between motor flux and current is derived directly via a microcomputer phase-locked loop synchronized to the integrated motor voltage. The delay between the application of a firing signal to a thyristor and the initiation of line current is determined and compensated for to achieve the desired angle between motor flux and motor current.

    摘要翻译: 控制电流逆变器(CCI)感应电动机驱动通过控制电动机电流和电动机磁通与电动机电流之间的角度来控制。 电动机磁通和电流之间的角度直接通过与集成电动机电压同步的微型计算机锁相环来获得。 确定并补偿了向晶闸管施加点火信号和启动线电流之间的延迟,以获得电动机通量和电动机电流之间的期望角度。

    Coordinated load commutated inverter protection system
    5.
    发明授权
    Coordinated load commutated inverter protection system 失效
    协调负载整流逆变器保护系统

    公开(公告)号:US4475150A

    公开(公告)日:1984-10-02

    申请号:US372750

    申请日:1982-04-28

    CPC分类号: H02M5/4505 H02H7/1216

    摘要: A fault protective system for a load commutated inverter motor drive including an AC to DC source side converter coupled from an AC source to a DC to AC load side converter via a DC link circuit and wherein the load side converter supplies AC power of varying magnitude and frequency to the synchronous motor load. A pair of microcomputers interlinked by a common digital memory respectively control the inverters and interface with hardware type sensor means for detecting the occurrence of a plurality of different types of faults. Additionally, a number of stored instructional sets or programs are respectively included in both microcomputers to detect by software means another plurality of faults. The detection of a fault on either side of the link circuit is communicated to the respective computer which subsequently communicates with the other microcomputer to effect a coordinated protective action in response to thyristor cell failures, circuit failures, and abnormal operating conditions. Cell failure faluts include those instances where a thyristor cell actually fails due to an open or short circuit as well as those cases where a cell fails to commutate properly due to firing strategy problems. Cirucit failures include open and short circuits both in the supply line and the motor leads, while abnormal operating conditions involve such things as low line voltage or excessive motor voltage.

    摘要翻译: 一种用于负载换向的电动机驱动器的故障保护系统,其包括经由DC链路电路从AC电源耦合到DC至AC负载侧转换器的AC至DC源侧转换器,并且其中所述负载侧转换器提供不同大小的AC电力, 频率同步电机负载。 由公共数字存储器互连的一对微型计算机分别控制逆变器并与硬件型传感器装置进行接口,以检测多种不同类型故障的发生。 另外,两个微型计算机中分别包括多个存储的指令集或程序,以通过软件来检测另外的多个故障。 将链路电路的任一侧的故障的检测通信给相应的计算机,该计算机随后与另一个微型计算机进行通信,以响应于晶闸管电池故障,电路故障和异常操作条件而进行协调的保护动作。 电池故障故障包括由于开路或短路而导致晶闸管电池实际故障的情况,以及由于触发策略问题,电池无法正确换向的情况。 Cirucit故障包括供电线路和电机引线中的开路和短路,而异常工作条件涉及低线路电压或电机电压过大等情况。

    Transitioning between multiple modes of inverter control in a load
commutated inverter motor drive
    6.
    发明授权
    Transitioning between multiple modes of inverter control in a load commutated inverter motor drive 失效
    在负载换向的变频器电机驱动器中,在多种变频器控制模式之间切换

    公开(公告)号:US4443747A

    公开(公告)日:1984-04-17

    申请号:US364453

    申请日:1982-04-01

    摘要: The load side converter or inverter in a load commutated inverter motor drive, including a source side AC to DC converter coupled to a DC to AC converter via a DC link circuit, is adapted to have at least three and preferably four modes of operation for bringing an AC motor load, and more particularly a synchronous motor, up to speed. In the preferred embodiment, the first mode constitutes an idle mode wherein the converter thyristors are maintained in a non-conducting state until commanded for normal operation. The second mode constitutes an initial start-up mode which assumes no knowledge of initial rotor position of the motor and simply utilizes a fixed low frequency firing signal to sequentially gate the thyristors using forced commutation to commutate the off-going thyristor. Thirdly, a second type of forced commutation mode is next entered into where the inverter frequency is synchronized to the rotor of the motor by sensing pseudo-flux waveforms until 5% to 10% of rated motor speed is achieved whereupon a fourth mode is entered into which comprises a self-commutation mode utilizing a phase lock loop operation using pseudo-flux wave zero crossings as synchronizing signals.In the three mode embodiment, the third mode is eliminated and the second mode modified to vary the load side converter frequency on a time basis until reaching some preset value (e.g., five (5) to fifteen (15) percent of motor rated frequency) at which time transition is made to the self-commutation mode.

    摘要翻译: 在负载换向的变频器电动机驱动器中的负载侧转换器或逆变器包括通过DC链路电路耦合到DC到AC转换器的源极侧AC到DC转换器,适于具有至少三个并且优选地四个操作模式 交流电动机负载,特别是同步电动机,直到速度。 在优选实施例中,第一模式构成空转模式,其中转换器晶闸管保持在非导通状态,直到命令用于正常操作。 第二模式构成初始启动模式,其不考虑电动机的初始转子位置,并且仅使用固定的低频点火信号来使用强制换向来顺序地对晶闸管进行栅极整流,从而使不稳定的晶闸管换向。 第三,接下来,通过感测伪通量波形,将逆变器频率与电动机的转子同步的第二种类型的强制换向模式,直到达到额定电动机速度的5%至10%,然后进入第四模式 其包括利用使用伪通量波过零作为同步信号的锁相环操作的自换流模式。 在三模式实施例中,第三模式被消除,第二模式被修改以在时间基础上改变负载侧转换器频率直到达到某个预设值(例如,电机额定频率的五(5)至十五(15)%) 此时转换为自换模式。

    Control for a force commutated current source var generator
    7.
    发明授权
    Control for a force commutated current source var generator 失效
    控制力换向电流源无功发生器

    公开(公告)号:US4496899A

    公开(公告)日:1985-01-29

    申请号:US508599

    申请日:1983-06-28

    IPC分类号: G05F1/70 H02J3/18

    摘要: The non-linear control characteristic of a force commutated current source inverter operating as a var generator is linearized to provide a similar dynamic response in both leading and lagging modes of operation by two inter-related control schemes. The first control scheme comprises a linear closed loop feedback which controls a thyristor firing circuit in response to a difference or error signal between a var command signal and an actual var feedback signal while the second control comprises a feed-forward non-linear network having a signal transfer function which models the non-linear control characteristic of the var generator and is operative to control the thyristor firing circuit in response to the summation of scaled values of the var command signal and the actual var feedback signal and wherein the scaled values provide a combined gain which is equal to unity.

    摘要翻译: 作为无功发生器运行的力换向电流源逆变器的非线性控制特性被线性化,以通过两个相互关联的控制方案在前导和滞后运行模式中提供类似的动态响应。 第一控制方案包括线性闭环反馈,其响应于无级命令信号和实际无效反馈信号之间的差异或误差信号来控制晶闸管触发电路,而第二控制包括前馈非线性网络,其具有 信号传递函数,其对所述无功发生器的非线性控制特性进行建模,并且响应于所述变频指令信号和所述实际变差反馈信号的标定值的总和来控制所述晶闸管触发电路,并且其中所述定标值提供 组合收益等于统一。

    Programmable deadband current regulator
    8.
    发明授权
    Programmable deadband current regulator 失效
    可编程死区电流调节器

    公开(公告)号:US4658192A

    公开(公告)日:1987-04-14

    申请号:US825086

    申请日:1986-01-31

    IPC分类号: H02P7/00 H02P7/28 H02P5/16

    CPC分类号: H02P7/2815 H02P7/05

    摘要: A method for supplying the excitation to a four quadrant drive DC electric motor having a forward and reverse controllable bridge rectifier power regulators for controlling the direction of motor rotation. The motor control system is capable of operating in a continuous and discontinuous current mode of operation and includes an electronic control circuit for calculating a firing angle from desired and measured system parameters.The electronic control system includes a reversing controller for developing a current command for generating firing pulses to fire selected switching elements in the power regulators for controlling the magnitude and polarity of the excitation, and a current sensor for sensing motor current. The method provides a smooth, continuous transitioning between the forward and reverse bridge in response to a sensed requirement for reversing excitation to the motor.

    摘要翻译: 用于向具有用于控制电机旋转方向的正向和反向可控桥式整流器功率调节器的四象限驱动DC电动机提供激励的方法。 电动机控制系统能够以连续和不连续的电流工作模式运行,并且包括用于根据期望和测量的系统参数计算触发角的电子控制电路。 电子控制系统包括一个反转控制器,用于产生用于产生点火脉冲的电流指令,以激发用于控制激励的幅度和极性的功率调节器中的选定开关元件,以及用于感测电动机电流的电流传感器。 该方法响应于将激励反转到电动机的感测要求,在正向和反向桥之间提供平滑,连续的过渡。

    Closed loop digital control system and method for motor control
    9.
    发明授权
    Closed loop digital control system and method for motor control 失效
    闭环数字控制系统及电机控制方法

    公开(公告)号:US4090116A

    公开(公告)日:1978-05-16

    申请号:US749648

    申请日:1976-12-10

    申请人: David L. Lippitt

    发明人: David L. Lippitt

    IPC分类号: H02P7/292 H02P23/00 H02P7/28

    摘要: A speed regulator and control system for controlling a motor from a polyphase AC source includes a data processor and a regulator and rectifier control interfacing the data processor with a controllable rectifier driving the motor is disclosed. The regulator and rectifier control, under control of the data processor, selectively transfers system parameters to the data processor, receives a calculated value proportional to firing angle from the data processor and supplies firing pulses to the rectifier to selectively connect each phase of the AC source to the motor as calculated by the data processor.

    摘要翻译: 用于从多相AC电源控制电动机的速度调节器和控制系统包括数据处理器以及将数据处理器与驱动电动机的可控整流器接口的调节器和整流器控制器。 在数据处理器的控制下,调节器和整流器控制器选择性地将系统参数传送到数据处理器,从数据处理器接收与触发角度成比例的计算值,并向整流器提供点火脉冲以有选择地连接AC源的每个相 由数据处理器计算的电机。