公开(公告)号：EP3343749A1

公开(公告)日：2018-07-04

申请号：EP16850304.3

申请日：2016-09-23

Applicant: Huawei Technologies Co., Ltd.

Inventor： SHI, Lei ,  FU, Dianbo ,  CAO, Zhen

IPC: H02M7/48

CPC classification number: H02M7/5387 ,  H02M1/32 ,  H02M1/36 ,  H02M5/45 ,  H02M7/483 ,  H02M7/487 ,  H02M7/537 ,  Y02E10/56

Abstract: A multi-level inverter is provided, including a direct current input unit (102), a first bidirectional switch (104), a second bidirectional switch (106), a third capacitor (C3), and an inverter unit (108). The direct current input unit includes a first capacitor (C1) and a second capacitor (C2) that are connected in series between positive and negative terminals of the direct current input power supply (E). The inverter unit includes a first switching tube (Q1), a second switching tube (Q2), a third switching tube (Q3), and a fourth switching tube (Q4) that are connected in series co-directionally between the positive and negative terminals of the direct current input power supply. One terminal of the first bidirectional switch is connected to a connection point between the third switching tube and the fourth switching tube, one terminal of the second bidirectional switch is connected to a connection point between the first switching tube and the second switching tube, and the other terminal of either the first bidirectional switch or the second bidirectional switch is connected to a connection point between the first capacitor and the second capacitor. A positive terminal of the third capacitor is connected to the connection point between the first switching tube and the second switching tube, and a negative terminal of the third capacitor is connected to the connection point between the third switching tube and the fourth switching tube. A designed circuit in which a direct current input unit and an inverter unit are bridged by using two groups of bidirectional switches is used to output more levels, so that an increased quantity of output voltage levels reduces harmonic content in an output waveform. This improves system efficiency and stability.

公开(公告)号：EP2750272B1

公开(公告)日：2018-05-23

申请号：EP13814817.6

申请日：2013-08-06

Applicant: Huawei Technologies Co., Ltd.

Inventor： LIU, Kelei ,  WANG, Fuzhou ,  LV, Yihang

IPC: H02M1/32 ,  H02M7/487

CPC classification number: H02H7/122 ,  H02H9/02 ,  H02M1/32 ,  H02M7/487

Abstract: This application discloses a current limiting control method for a diode neutral-point-clamped three-level inverter and a related circuit. Specifically, when a current in switching tubes is lowered to a value not greater than a first preset current value, the current limiting control method for a diode neutral-point-clamped three-level inverter and the related circuit drive a switching tube of the switching tubes inside the bridge arm to be turned on; after a first delay time, drive another switching tube of the inside switching tubes to be turned on; after a second delay time, control a switching tube of the inside switching tubes to be turned off and another switching tube to be normally turned on; and control all the switching tubes to be turned on or off according to a control time sequence of the diode neutral-point-clamped three-level inverter circuit. In this control manner, a turn-on/off order of the switching tubes in the diode neutral-point-clamped three-level inverter circuit is controlled, voltage stress of the switching tubes is reduced, and it is ensured that the voltage stress of the switching tubes does not exceed a limit when a current-limiting state is exited.

公开(公告)号：EP2892145B1

公开(公告)日：2018-04-18

申请号：EP12886023.6

申请日：2012-10-02

Applicant: Fuji Electric Co., Ltd.

Inventor： WANG, Qichen ,  FUJITA, Satoru

IPC: H02M7/487 ,  H02M5/293

CPC classification number: H02M7/539 ,  H02M1/10 ,  H02M1/12 ,  H02M1/42 ,  H02M5/293 ,  H02M7/487 ,  H02M7/49 ,  H02M7/537 ,  H02M2001/0012 ,  H02M2005/2932 ,  Y02B70/12

Abstract: In a period in which the polarities of output voltage and output current of a power converter differ, a pulse train voltage corresponding to a PWM signal is output by a switching element Q1 and switching element Q2 being turned off, one element of a switch element S1 and switch element S2 being turned on, and the other element being turned on and off based on an inverted signal of a PWM signal pulse width modulated in accordance with an output voltage command.

公开(公告)号：EP2437389B1

公开(公告)日：2018-04-18

申请号：EP11181455.4

申请日：2011-09-15

Applicant: General Electric Company

Inventor： Shen, Jie ,  Schroeder, Stefan ,  Roesner, Robert

IPC: H02M7/487

CPC classification number: H02M7/487 ,  H02M2001/0025

Abstract: A control system (50) for a multilevel converter (40) includes a differential mode current regulator (84), a neutral point (NP) controller (86) and a PWM controller (88) for generating switching pulses for the multilevel converter (40). The differential mode current regulator (84) generates reference voltage command signals based on a difference between reference current command signals and actual current command signals, and the NP controller (86) determines a modified neutral point current signal in response to a DC link voltage unbalance. The NP controller (86) utilizes the modified neutral point current signal to generate a common mode reference voltage signal. The switching pulses are generated by the PWM controller (88) based on the reference voltage command signals and the common mode reference voltage signal.

公开(公告)号：EP2787628B1

公开(公告)日：2018-03-28

申请号：EP12854286.7

申请日：2012-11-15

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： KIDERA, Kazunori ,  NISHI, Mariko

IPC: H02M7/483 ,  H02M7/487 ,  H02M7/48 ,  H02M7/5387 ,  H02M7/497 ,  H02M7/501 ,  H02M7/49

CPC classification number: H02M7/49 ,  H02M7/487 ,  H02M7/493 ,  H02M7/5387 ,  H02M7/5395

Abstract: An inverter device (1), including a first inverter (10), and a second inverter (20) connected in parallel to the first inverter. Both the first and second inverters (10, 20) are three-level inverters. The first and second inverters (10, 20) generate first and second output voltages (V1, V2) using the voltage (Vc) at the connection point between a first capacitor (C1) and a second capacitor (C2) connected in series and evenly allocating a power supply voltage (Vin). A control circuit (40) duty-controls the second inverter at high frequency, when the second inverter (20) switches the level of the second output voltage (V2).

公开(公告)号：EP3038244B1

公开(公告)日：2018-03-21

申请号：EP15199351.6

申请日：2015-12-10

Applicant: Kabushiki Kaisha Toshiba

Inventor： Ryuta, Hasegawa ,  Shinya, Kono ,  Takashi, Fujita ,  Teruyuki, Ishizuki

IPC: H02M1/12 ,  H02M7/487

CPC classification number: H02M1/12 ,  H02M7/487

Abstract: According to one embodiment, there is provided a power conversion device, including a control unit (20) configured to control ON/OFF of a switching element of a neutral-point-clamped power conversion device unit, wherein the control unit (20) drives the power conversion device unit by a one-pulse control, controls a phase difference of an output voltage of the power conversion device unit with respect to a reference phase of to control an active current component of an output current of the power conversion device unit, and controls ON/OFF based on: (a) a phase angle for eliminating a predetermined odd-order harmonic component of the output voltage; and (b) a sum of the reference phase and the phase difference.

公开(公告)号：EP2830210B1

公开(公告)日：2018-03-14

申请号：EP14174839.2

申请日：2014-06-27

Applicant: KABUSHIKI KAISHA TOSHIBA

Inventor： Inagaki, Katsuhisa ,  Suzuki, Kentaro ,  Hasegawa, Ryuta ,  Ishizuki, Teruyuki ,  Kusunoki, Kiyoshi

IPC: H02P9/38 ,  H02M5/458 ,  F03D7/00 ,  H02H7/12 ,  H02P9/00 ,  H02M1/32 ,  H02M7/487 ,  H02M1/14 ,  H02M7/493 ,  H02H7/06

CPC classification number: H02P9/302 ,  H02H7/06 ,  H02H7/1216 ,  H02M1/14 ,  H02M1/32 ,  H02M5/4585 ,  H02M7/487 ,  H02M7/493 ,  H02P9/007 ,  H02P9/38

Abstract: According to one embodiment, there is provided a generator excitation apparatus including a plurality of first power converters (3) and a second power converter (4). The plurality of first power converters (3) are electrically connected to windings of respective phases of rotors of a wound rotor type induction generator (2) in which the windings of the rotors of the respective phases are electrically independent, and are configured to bidirectionally convert DC and AC. The second power converter (4) is configured to bidirectionally convert DC and AC between DC sides of the first power converters (3) and a three-phase DOC power supply (1). The DC sides of the first power converters (3) are electrically connected together to a DC side of the second power converter (4).

公开(公告)号：EP3273590A1

公开(公告)日：2018-01-24

申请号：EP17181495.7

申请日：2017-07-14

Applicant: Vertiv Tech Co., Ltd.

Inventor： XU, Fubin ,  HUANG, Hai ,  BING, Yang

IPC: H02M7/487 ,  H02M7/219 ,  H02M1/00 ,  H02M1/34

CPC classification number: H02M3/1582 ,  H02M1/4208 ,  H02M3/1588 ,  H02M3/33507 ,  H02M3/33592 ,  H02M7/217 ,  H02M7/219 ,  H02M7/487 ,  H02M2001/0058 ,  H02M2001/342 ,  H03K17/164 ,  Y02B70/1491

Abstract: The present invention discloses a soft switching auxiliary circuit, comprising: an auxiliary coupling inductor configured to receive currents from a respective branch of a main circuit connected to the soft switching auxiliary circuit and perform a current sharing outputting; a clamping diode configured to receive an inductive voltage from the auxiliary coupling inductor and feed the inductive voltage back to a main switch transistor of the main circuit; an auxiliary switch transistor configured to receive a current from the main switch transistor of the main circuit and output the current to the clamping diode. The present invention further discloses a three-level three-phase zero-voltage conversion circuit. By means of the present invention, it is possible to reduce hard switching loss, to improve system switching frequency, to improve efficiency and to reduce electromagnetic interference.

Abstract translation: 本发明公开了一种软开关辅助电路，包括：辅助耦合电感，用于接收来自与所述软开关辅助电路连接的主电路各自支路的电流，并进行均流输出; 钳位二极管，被配置为从辅助耦合电感器接收感应电压并且将感应电压馈送回主电路的主开关晶体管; 辅助开关晶体管，被配置为从主电路的主开关晶体管接收电流并将电流输出到钳位二极管。 本发明还公开了一种三电平三相零电压转换电路。 通过本发明，可以降低硬开关损耗，改善系统开关频率，提高效率并降低电磁干扰。

公开(公告)号：EP3273586A1

公开(公告)日：2018-01-24

申请号：EP16764765.0

申请日：2016-03-07

Applicant: Mitsubishi Electric Corporation ,  Toshiba Mitsubishi-Electric Industrial Systems Corporation

Inventor： MUKUNOKI Kaho ,  FUJII Toshiyuki ,  UDA Ryosuke ,  TSUCHIYA Taichiro ,  MATSUDA Akihiro ,  TAGUCHI Hisanori

IPC: H02M7/48

CPC classification number: H02M7/487 ,  H02M7/48 ,  H02M7/483 ,  H02M7/49 ,  H02M2001/0025 ,  H02M2001/0074 ,  H02M2007/4835

Abstract: This power conversion device (100) includes: a positive arm (5) and a negative arm (6) each of which is formed by connecting a plurality of converter cells (10) in series, the converter cells (10) each being composed of a plurality of semiconductor switching elements (30, 40) and a DC capacitor (34, 44); and a control circuit (20). An arm balance control unit (27) in the control circuit (20) calculates a first voltage adjustment value ΔVc for balancing voltage (Vcpp) of the DC capacitors (34, 44) in the positive arm (5) and voltage (Vcpn) of the DC capacitors (34, 44) in the negative arm (6). The control circuit (20) adjusts an AC control command (Vcp) using the first voltage adjustment value (ΔVc), thereby calculating an AC voltage command (Vacp) for AC voltage to be outputted to an AC line for each phase.

Abstract translation: 该功率转换装置（100）包括：通过串联连接多个转换器单元（10）而形成的正极臂（5）和负极臂（6），每个转换器单元（10）由 多个半导体开关元件（30,40）和DC电容器（34,44）; 和控制电路（20）。 控制电路（20）中的臂平衡控制单元（27）计算用于平衡正臂（5）中的DC电容器（34,44）的平衡电压（Vcpp）的电压（Vcpn）的第一电压调整值ΔVc 负臂（6）中的直流电容器（34,44）。 控制电路（20）使用第一电压调整值（ΔVc）来调整AC控制命令（Vcp），从而针对每相输出到AC线的AC电压计算AC电压命令（Vacp）。

公开(公告)号：EP3188336A4

公开(公告)日：2018-01-17

申请号：EP15836712

申请日：2015-05-08

Applicant: SUNGROW POWER SUPPLY CO LTD

Inventor： LI XIAOXUN ,  HAN ZHIQIANG ,  LI HAOYUAN ,  MEI XIAODONG ,  YANG BENHE ,  SHEN KAI

IPC: H02J3/38 ,  H02H7/122 ,  H02M1/00 ,  H02M1/08 ,  H02M7/5395 ,  H02S40/32

CPC classification number: H02M7/5395 ,  H02H7/1225 ,  H02J3/383 ,  H02M1/083 ,  H02M7/487 ,  H02M2001/0048 ,  H02M2007/53876 ,  H02S40/32 ,  H02S50/10 ,  Y02E10/563

Abstract: A three-level photovoltaic inverter pulse width modulation method and a three-level photovoltaic inverter pulse width modulator. The method comprises: when it is detected that potential safety hazards exist in a three-level photovoltaic inverter, switching the pulse width modulation mode of the three-level photovoltaic inverter into a 13-vector space vector pulse width modulation (SVPWM) mode (102), to solve the fault or abnormal problems in the three-level photovoltaic inverter such as midpoint potential offset or excessively large common mode leakage current formed when the ground stray capacitance of a photovoltaic assembly is large, wherein according to the 13-vector SVPWM mode, 12 short vectors in 27 on-off state vectors of the three-level photovoltaic inverter are abandoned, and only six long vectors, six middle vectors and three zero vectors are reserved.