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    • 3. 发明授权
    • Multi level inverter using cascade configuration and control method thereof
    • 采用级联配置的多电平逆变器及其控制方法
    • EP1968180B1
    • 2018-04-04
    • EP08003358.2
    • 2008-02-25
    • LS Industrial Systems Co., Ltd
    • Jang, Han-Keun
    • H02M7/49H02P23/00H02P27/08
    • H02M7/49H02M2001/0003H02P23/26H02P27/08H02P27/14
    • A multilevel inverter using a cascade configuration with a device for equally controlling a power factor for each unit cell includes: a master controller (1), a plurality of power cells (4-1,4-2,...,4-n) connected in series for each of three AC (Alternating Current) phases, a phase shift transformer for supplying a power cell input voltage, a communication network (2) to provide a communication path between the master controller (1) and each power cell (4-1,4-2,...,4-n), and cell controllers (3-1,3-2,...,3-n) to control output voltages and output frequencies of the respective power cells according to a voltage command and a frequency command from the master controller (1), each cell controller (3-1,3-2,...,3-n) having a pulse width modulator to generate a pulse width modulation control signal of a variable voltage and a variable frequency to the connected corresponding power cell (4-1,4-2,...,4-n), wherein each cell controller (3-1,3-2,...,3-n) is configured to calculate a phase difference value of the corresponding power cell according to a predetermined total number of connected power cells and the floor number (i.e., the serial connection sequence) of the corresponding power cell to thereafter phase-shift a chopping wave by the calculated phase difference value, thereby compensating for the phase differences between each power cell (4-1,4-2,...,4-n).
    • 5. 发明公开
    • Method and system for driving electric machines
    • 驱动电机的方法和系统
    • EP2854271A2
    • 2015-04-01
    • EP14185925.6
    • 2014-09-23
    • GE Energy Power Conversion Technology Ltd
    • Zhang, DiGarces, Luis JoseRockhill, Andrew AllenLai, Rixin
    • H02M1/32H02M5/42H02M7/493H02J7/02H02P1/16
    • H02P27/06H02M7/217H02M7/487H02M2007/4835H02P1/16H02P27/14H02P27/16
    • A system for driving an electric machine is provided. The system includes a power converter coupled to an input source and the electric machine. The power converter includes a leg (302) that includes a first string (304) and a second string (306). The first string (304) includes plurality of controllable semiconductor switches (S1-S4), a first connecting node (312) and a second connecting node (314). The first string (304) is operatively coupled across a first bus (308) and a second bus (310). The second string (306) is operatively coupled to the first string (304) via the first and second connecting nodes (312, 314). The second string (306) comprises plurality of switching modules. The switching modules include fully controllable semiconductor switches and energy storage devices. The system further includes a system controller configured to provide activation commands to the controllable semiconductor switches (S1-S4) and the switching modules such that energy stored in the energy storage device is provided to the electric machine when the electric machine is switched on for operation.
    • 提供了一种用于驱动电机的系统。 该系统包括耦合到输入源和电机的功率转换器。 功率转换器包括具有第一串(304)和第二串(306)的腿(302)。 第一串(304)包括多个可控半导体开关(S1-S4),第一连接节点(312)和第二连接节点(314)。 第一串(304)跨越第一总线(308)和第二总线(310)可操作地耦合。 第二串(306)经由第一和第二连接节点(312,314)可操作地耦合到第一串(304)。 第二串(306)包括多个开关模块。 开关模块包括完全可控的半导体开关和能量存储设备。 该系统进一步包括系统控制器,该系统控制器被配置为向可控半导体开关(S1-S4)和开关模块提供激活命令,使得当电机接通以进行操作时将存储在能量存储装置中的能量提供给电机 。
    • 9. 发明公开
    • Model predictive control with reference tracking
    • Prognostische Modellsteuerung mit Bezugsverfolgung
    • EP2725706A1
    • 2014-04-30
    • EP12189564.3
    • 2012-10-23
    • ABB Technology AG
    • Quevedo, DanielGeyer, Tobias
    • H02P27/12H02P27/14H02M7/487
    • H02M7/483H02M7/487H02P21/0017H02P23/00H02P27/12H02P27/14
    • An electrical converter (10) comprising a plurality of semiconductor switches (16), wherein the electrical converter is adapted for generating a two-level or multi-level output voltage from an input voltage by switching the plurality of semiconductor switches (16).
      A method for controlling the electrical converter (10) comprises the steps of: receiving a reference electrical quantity ( i S * ) and an actual electrical quantity (i S ); determining a sequence of future electrical quantities of the electrical converter (10) from the actual electrical quantity; determining a maximal cost value based on the sequence of future electrical quantities; iteratively determining an optimal switching sequence for the electrical converter (10), wherein a switching sequence comprises a sequence of future switching states for the semiconductor switches of the electrical converter; and selecting the first switching state of the optimal switching sequence as the next switching state ( u ) to be applied to the semiconductor switches (16) of the electrical converter (10).
      The optimal switching sequence is iteratively determined by: extending a switching sequence by appending a possible switching state to the switching sequence; determining a cost value for the extended switching sequence with a cost function based on the sequence of future electrical quantities; and discarding the extended switching sequence, when the cost value is higher than the maximal cost value.
    • 一种包括多个半导体开关(16)的电转换器(10),其中所述电转换器适于通过切换所述多个半导体开关(16)从输入电压产生二电平或多电平输出电压。 一种用于控制电转换器(10)的方法,包括以下步骤:接收参考电量(i S *)和实际电量(i S); 从实际电量确定电转换器(10)的未来电量的顺序; 基于未来电量的顺序确定最大成本值; 迭代地确定用于所述电转换器(10)的最佳切换序列,其中切换序列包括所述电转换器的半导体开关的未来切换状态序列; 以及选择最佳切换序列的第一切换状态作为要施加到电转换器(10)的半导体开关(16)的下一个切换状态(u)。 迭代确定最佳切换序列:通过将可能的切换状态附加到切换序列来扩展切换序列; 基于未来电量的顺序,以成本函数确定扩展切换序列的成本值; 并且当成本值高于最大成本值时,丢弃扩展的切换序列。