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21. 发明授权

US11689013B2 Source-network coordination type direct-current (DC) circuit breaker based on pre-charged capacitors for modular multilevel converters (MMC) based DC grid 有权
公开(公告)号：US11689013B2
公开(公告)日：2023-06-27
申请号：US17511598
申请日：2021-10-27
申请人： Tianjin University
发明人： Xiaolong Chen , Xiaowen Han , Yongli Li
IPC分类号： H02H7/26 , H02J3/36 , H02M1/32
CPC分类号： H02H7/268 , H02J3/36 , H02M1/32
摘要： A source-network coordination type direct-current (DC) circuit breaker based on pre-charged capacitors for an MMC based DC grid is provided. The MMC based DC grid is provided with four converter stations, each having two converters, which are in loop connection through a double-loop DC overhead line. Two ends of each DC line connecting the converters are separately equipped with DC circuit breakers for isolating a fault of the DC line. An MMC active voltage adjusting control strategy is matched with pre-charged capacitor voltage in the self-adaptive mode to provide a beneficial breaking condition for a quick mechanical switch branch, so that the fault line is effectively cut off.

22. 发明公开

US20230144976A1 HIGH VOLTAGE DC SYSTEMS 审中-公开
公开(公告)号：US20230144976A1
公开(公告)日：2023-05-11
申请号：US17521411
申请日：2021-11-08
申请人： Hamilton Sundstrand Corporation
发明人： Tom A. Utecht , John F. Defenbaugh , Robert L. Seagren
IPC分类号： H02H7/125 , H02H1/00 , H02M1/32 , H02J3/36 , B64D41/00
CPC分类号： H02H7/125 , B64D41/00 , H02H1/0007 , H02J3/36 , H02M1/32
摘要： A high voltage DC (HVDC) system can include a generator configured to output alternating current (AC), a rectifier connected to the generator via AC phase lines, the rectifier configured to convert the AC to DC to output the DC to DC feeder lines, and a crowbar system. The crowbar system can include a switch module operatively connected to the AC phase lines to prevent AC from flowing to the rectifier in a cutoff state. The crowbar system can be configured to determine whether at least one cutoff condition exists. The at least one cutoff condition can be or include one or more of a DC overcurrent downstream of the rectifier, a DC overvoltage downstream of the rectifier, an AC overcurrent from the generator, or an arc fault. The crowbar system can be configured to control the switch module to the cutoff state if the at least one cutoff condition exists.

23. 发明授权

US11641114B2 Use of the unused duration injection units in an array to reduce oscillations during impedance injection for corrections of problems 有权
公开(公告)号：US11641114B2
公开(公告)日：2023-05-02
申请号：US17735914
申请日：2022-05-03
申请人： Smart Wires Inc.
发明人： Antonio Ginart , Michael T. Garrison Stuber , Haroon Inam , Shreesha Adiga Manoor
IPC分类号： H02J3/36
摘要： A control module controls impedance injection units (IIUs) to form multiple connection configurations in sequence. Each connection configuration has one IIU, or multiple IIUs in series, parallel or combination of series and parallel. The connection configurations of IIUs are coupled to a high-voltage transmission line. The control module and the IIUs generate rectangular impedance injection waveforms. When the waveforms are combined and injected to the high-voltage transmission line, this produces a pseudo-sinusoidal waveform.

24. 发明申请

US20230084187A1 ELECTRICAL ASSEMBLY 有权
公开(公告)号：US20230084187A1
公开(公告)日：2023-03-16
申请号：US17801878
申请日：2021-03-02
申请人： General Electric Technology GmbH
发明人： Javier CHIVITE-ZABALZA , John OUTRAM , Colin DAVIDSON
IPC分类号： H02M7/217 , H02J3/36
摘要： An electrical assembly includes a number of modules, each module including at least one module switching element and at least one energy storage device, each module switching element and each energy storage device in each module arranged to be combinable to provide a voltage source, each module including a discharge circuit with a discharge switching element and a discharge resistor, each discharge switching element switchable to switch the corresponding discharge resistor into and out of the corresponding module, wherein the electrical assembly includes a controller configured to control the discharge switching elements to modulate the switching of each discharge resistor into and out of the corresponding module in a voltage balancing mode when the modules are in a blocked state so that each module emulates a resistive load profile to balance a distribution of voltages between the modules, wherein the resistive load profile includes at least one positive resistive slope.

25. 发明申请

US20230062705A1 ELECTRIC POWER SUPPLY APPARATUS FOR A HIGH-POWER USER DEVICE 有权
公开(公告)号：US20230062705A1
公开(公告)日：2023-03-02
申请号：US17799919
申请日：2021-02-11
申请人： DANIELI & C. OFFICINE MECCANICHE S.P.A.
发明人： Antonello Mordeglia , Roberto Moltenni
IPC分类号： H02J3/36 , H02M7/757 , F27B3/08 , H01B12/16
摘要： An electric power supply apparatus for a user device, in particular for steel industry applications, that includes means for connection to an electricity grid for supplying a mains voltage and a mains current, and at least one electric line for connecting the electricity grid to the user device, wherein the electric line includes one or more electric apparatuses located between the electricity grid and the user device.

26. 发明授权

US11575265B2 Method for controlling output level of modular multilevel converter for reducing power system frequency change 有权
公开(公告)号：US11575265B2
公开(公告)日：2023-02-07
申请号：US16958268
申请日：2018-12-21
申请人： HYOSUNG HEAVY INDUSTRIES CORPORATION , INDUSTRY-ACADEMIC COOPERATION FOUNDATION, YONSEI UNIVERSITY
发明人： Hee Jin Kim , Dong Su Lee , Kyeon Hur , Jae Sik Kang , Sang Min Kim
IPC分类号： H02M7/483 , H02J3/36 , H02M5/458
摘要： A method of controlling output levels of an MMC converter to reduce fluctuation in a power grid frequency, which adjusts an output level of the MMC converter in response to a change in a power grid frequency of a power grid system in the MMC converter connected to a grid system, is proposed. The method includes a detection step of detecting a power grid frequency of a grid connected to the MMC converter in real time, a comparison step of comparing the detected power grid frequency with a preset reference power grid frequency, and an adjustment step of adjusting a number of output levels of the MMC converter to reduce a difference between the detected power grid frequency and the reference power grid frequency when the detected power grid frequency and the reference power grid frequency are different from each other.

27. 发明申请

US20220368155A1 Power Supply Assembly and Switch Assembly 有权
公开(公告)号：US20220368155A1
公开(公告)日：2022-11-17
申请号：US17663548
申请日：2022-05-16
申请人： ABB Schweiz AG
发明人： Esa-Kai Paatero , Alessandro Antoniazza , Matteo Cogliati
IPC分类号： H02J9/06 , H02J3/36 , H02M3/156
摘要： A power supply assembly including a primary source connection, a secondary source connection, a load connection, a primary current supply route, a supply switch system, and a converter system. The supply switch system is electrically located in the primary current supply route, and adapted for disconnecting the primary source connection from the load connection, the supply switch system including a plurality of supply switch units connected in parallel, each of the supply switch units including a controllable semiconductor switch. The power supply assembly includes a series impedance system having at least one series impedance member, and adapted to provide a balancing voltage drop for each of the parallel connected supply switch units of the supply switch system, wherein the balancing voltage drop is in series with a corresponding supply switch unit.

28. 发明申请

US20220337064A1 ELECTRICAL ASSEMBLY 有权
公开(公告)号：US20220337064A1
公开(公告)日：2022-10-20
申请号：US17641074
申请日：2020-09-03
申请人： General Electric Technology GmbH
发明人： Pablo BRIFF , Huy Quoc Si DANG , Richard ZHANG
IPC分类号： H02J3/36 , H02M1/00 , H02M7/483 , G01R19/00
摘要： There is provided an electrical assembly comprising a converter (20) for connection to an electrical network (40), the converter (20) comprising at least one module (44) including at least one switching element (46) and at least one energy storage device (48), the or each switching element (46) and the or each energy storage device (48) in the or each module (44) arranged to be combinable to selectively provide a voltage source, the electrical assembly including a controller (54) configured to selectively control the switching of the or each switching element (46) in the or each module (44), wherein the electrical assembly includes a sensor (56a) configured for measuring a current of the electrical network (40), wherein the controller (54) and sensor (56a) are configured to operate in coordination to carry out a characterisation of an electrical parameter of the electrical network (40) so that, in use: the controller (54) selectively controls the switching of the or each switching element (46) in the or each module (44) to modify an electrical parameter of the converter (20) so as to modify the current of the electrical network (40); the sensor (56a) measures a resultant modified current of the electrical network (40); and the controller (54) processes the measured resultant modified current of the electrical network (40) so as to characterise the electrical parameter of the electrical network (40).

29. 发明申请

US20220311241A1 Source-network Coordination Type Direct-current (DC) Circuit Breaker Based on pre-charged Capacitors for Modular Multilevel Converters (MMC) Based DC Grid 有权
公开(公告)号：US20220311241A1
公开(公告)日：2022-09-29
申请号：US17511598
申请日：2021-10-27
申请人： Tianjin University
发明人： XIAOLONG CHEN , XIAOWEN HAN , YONGLI LI
IPC分类号： H02H7/26 , H02M1/32 , H02J3/36
摘要： A source-network coordination type direct-current (DC) circuit breaker based on pre-charged capacitors for an MMC based DC grid is provided. The MMC based DC grid is provided with four converter stations, each having two converters, which are in loop connection through a double-loop DC overhead line. Two ends of each DC line connecting the converters are separately equipped with DC circuit breakers for isolating a fault of the DC line. An MMC active voltage adjusting control strategy is matched with pre-charged capacitor voltage in the self-adaptive mode to provide a beneficial breaking condition for a quick mechanical switch branch, so that the fault line is effectively cut off.

30. 发明授权

US11444462B2 Power generation system for wide speed range applications 有权
公开(公告)号：US11444462B2
公开(公告)日：2022-09-13
申请号：US17167833
申请日：2021-02-04
申请人： Honeywell International Inc.
发明人： Cristian E. Anghel
IPC分类号： H02M3/158 , H02J3/36 , H02M7/06 , H02P9/02
摘要： Techniques for achieving a constant narrow range DC voltage are disclosed. In an embodiment, a system comprises at least one variable speed, multi-phased generator configured to generate an alternating current (AC) voltage. A plurality of diode rectifier circuits is coupled to the at least one multi-phased generator. The plurality of diode rectifier circuits are configured to convert the AC voltage to a direct current (DC) voltage. A plurality of high-power DC contactors is connected to the plurality of diode rectifier circuits. The plurality of high-power DC contactors is configured to configure outputs of the plurality of diode rectifier circuits in one of a parallel, series, and/or mixed parallel and series configuration. A controller coupled to the plurality of diode rectifier circuits and is configured to reconfigure the plurality of high-power DC contactors based on a control parameter of the at least one multi-phased generator.

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