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公开(公告)号：US20160164296A1
公开(公告)日：2016-06-09
申请号：US14907242
申请日：2014-06-13
摘要： A module for use in a voltage source converter includes: first and second terminals; an energy storage device; at least one switching element to switch the energy storage device into or out of circuit with the terminals to selectively provide a voltage source; and a voltage-limiting component and/or a resistive element. The switching element(s) are switchable to selectively form a current path that passes through the voltage-limiting component and/or the resistive element and are further switchable to selectively switch the energy storage device into or out of circuit with the voltage-limiting component and/or the resistive element. The module includes electrical blocks including first and second pairs of electrical blocks connected in parallel with the energy storage device in a full-bridge arrangement. Each of the electrical blocks include a switching element, and one of the electrical blocks includes the voltage-limiting component and/or the resistive element.
摘要翻译： 一种用于电压源转换器的模块，包括：第一和第二端子; 能量储存装置; 至少一个开关元件，用于将所述能量存储装置与所述端子切换到电路中以选择性地提供电压源; 以及电压限制部件和/或电阻元件。 开关元件可切换以选择性地形成通过限压部件和/或电阻元件的电流路径，并且可进一步切换以便将电能存储装置选择性地切换到电压限制部件 和/或电阻元件。 该模块包括电气块，其包括以全桥布置与电能存储装置并联连接的第一和第二对电气块。 每个电气块包括开关元件，并且电气块中的一个包括电压限制部件和/或电阻元件。
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公开(公告)号：US11005266B2
公开(公告)日：2021-05-11
申请号：US15753708
申请日：2016-08-18
IPC分类号： H02J3/36 , H02H7/22 , H02J3/18 , H02H3/087 , H02H7/26 , H02M7/68 , H02M7/483 , H02M1/32 , H02H3/02
摘要： There is provided an electrical assembly for use in a power transmission network. The electrical assembly includes a converter including terminals for connection to an electrical network, where the first terminal is a DC terminal. The assembly also includes a DC power transmission medium connected to the DC terminal, and a circuit interruption device including switching element(s) and an energy absorption element, each switching element being switchable to divert a flow of current in the DC power transmission medium through the energy absorption element in order to reduce the flow of current in the DC power transmission medium; The assembly also includes a converter control unit programmed to operate the converter to control a DC voltage at the DC terminal in a leakage current reduction mode to control a voltage across the energy absorption element.
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公开(公告)号：US10530160B2
公开(公告)日：2020-01-07
申请号：US15559660
申请日：2016-03-17
摘要： A power transmission network, for interconnecting a variable power source and a AC electrical network including: a DC transmission link for power transmission between a network side converter and a source side converter; a AC transmission link for power transmission from the respective variable power source to a source side converter; a source side converter including: a DC connecting point operably connected to the respective transmission link; and an AC connecting point operably connected to the respective transmission link; a network side converter including: an AC connecting point for connection to the respective electrical network; and a DC connecting point operably connected to the respective transmission link; and a control system, where a network side converter is designated as a first converter, and the control system is configured to operate each first converter as a DC slack bus to vary a DC voltage at its DC connecting point.
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公开(公告)号：US10951109B2
公开(公告)日：2021-03-16
申请号：US16491446
申请日：2018-03-05
摘要： In the field of line commutated converters, for use in high voltage direct current (HVDC) power transmission, a line commutated converter comprises a plurality of converter limbs that extend between first and second DC terminals. Each converter limb includes first and second limb portions which are separated by an AC terminal. The first limb portions together define a first limb portion group and the second limb portions together define a second limb portion group. Each limb portion includes at least one switching element that is configured to turn on and conduct current when it is forward biased and it receives a turn on signal and to naturally turn off and no longer conduct current when it is reverse biased and the current flowing through it falls to zero. The converter also includes a control unit.
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公开(公告)号：US10700514B2
公开(公告)日：2020-06-30
申请号：US15535296
申请日：2015-12-10
摘要： A DC electrical network comprising DC terminals operatively connectable to a converter; and DC transmission paths arranged to interconnect the DC terminals, and including a DC power transmission medium and a switching apparatus. The DC network further including: an active power electronic device connected in at the DC transmission paths, the active power electronic device; a detector configured to detect faults in the DC transmission paths; and a control unit programmed to operate the active power electronic device to vary an apparent impedance of a faulty DC transmission path to force a current flowing in the faulty DC transmission path to reduce to a target current level, and operate the switching apparatus to block current from flowing in the faulty DC transmission path when the current flowing in the faulty corresponding DC transmission path is reduced to the target current level.
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公开(公告)号：US10333313B2
公开(公告)日：2019-06-25
申请号：US15748717
申请日：2016-07-28
摘要： There is provided an electrical assembly for use in an electrical system. The electrical assembly comprises a DC path. The DC path includes: a DC power transmission medium; and a current commutation device, the current commutation device including a switching element and an energy absorbing element, the switching element arranged to permit a current flowing, in use, through the DC path to flow through the switching element and at the same time bypass the energy absorbing element, wherein the electrical assembly further includes a control unit programmed to selectively control the switching of the switching element to commutate the current directly from the switching element to the energy absorbing element in order to increase the resultant voltage drop caused by the flow of direct current through the DC path in which the current commutation device is connected and thereby oppose the flow of the current through the DC path.
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公开(公告)号：US10305291B2
公开(公告)日：2019-05-28
申请号：US15307566
申请日：2015-04-28
IPC分类号： H02J7/34 , H02J1/10 , H02J3/38 , H02J5/00 , H02P9/10 , H02M5/40 , H02M7/02 , H02J3/36 , H02P101/15
摘要： A wind farm side voltage source converter comprises a DC terminal for connection to a DC transmission link, an AC terminal for connection to a wind farm that includes at least one wind turbine, and a main controller. The main controller is configured to modify an active power demand (Pdemand) of the voltage source converter which is received from a higher level controller by introducing an artificial inertia factor and/or in response to a measured DC voltage (Vdc_msr) at the DC terminal.
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公开(公告)号：US11927617B2
公开(公告)日：2024-03-12
申请号：US17267841
申请日：2019-08-13
摘要： There is provided an apparatus (20) for monitoring a condition of an electrical power transmission medium (22), the apparatus (20) comprising: a signal source (24) for transmitting a signal (30) to travel along the electrical power transmission medium (22); and a monitoring device (26) configured to detect one or more reflected signals (34) in the electrical power transmission medium (22), wherein the monitoring device (24) is configured to use the or each detected reflected signal (34) to determine a change in capacitance of the electrical power transmission medium (22).
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公开(公告)号：US10693388B2
公开(公告)日：2020-06-23
申请号：US14916543
申请日：2014-07-24
摘要： A modular power converter includes first and second terminals to connect to electrical networks and at least one module connected between the first and second terminals, the module(s) including at least one switching element and at least one energy storage device, the switching element(s) and the energy storage device(s) combining to selectively provide a voltage source, the switching element(s) being switchable to transfer power between the first and second terminals. The converter further includes a control unit configured to selectively control switching of the switching element(s) to store energy from or release energy to either or both of the first and second terminals so as to decouple respective power flows at the first and second terminals and thereby inhibit a modulation of power flow at one of the first and second terminals from modifying a power flow at the other of the first and second terminals.
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公开(公告)号：US20200036281A1
公开(公告)日：2020-01-30
申请号：US16491446
申请日：2018-03-05
摘要： In the field of line commutated converters, for use in high voltage direct current (HVDC) power transmission, a line commutated converter (10) comprises a plurality of converter limbs (12A, 12B, 12C) that extend between first and second DC terminals (16, 18). Each converter limb (12A, 12B, 12C) includes first and second limb portions (22, 24) which are separated by an AC terminal (26A, 26B, 26C). The first limb portions (22) together define a first limb portion group (28) and the second limb portions (24) together define a second limb portion group (30). Each limb portion (22, 24) includes at least one switching element (36, 36 2, 36 3, 36 4, 36, 36 6) that is configured to turn on and conduct current when it is forward biased and it receives a turn on signal and to naturally turn off and no longer conduct current when it is reverse biased and the current flowing through it falls to zero. The converter (10) also includes a control unit (38) which is programmed to, in use, control successive switching of the switching elements (36, 36 2, 36 3, 36 4, 36, 36 6) whereby a first switching element (36) in the first limb portion group (28) and a second switching element (36 2) in the second limb portion group (30) and a different converter limb (12B, 12C) to the first switching element (36) connect two corresponding AC terminals (26A, 26C in series between the first and second DC terminals (16, 18). The control unit (38) is further programmed to send a third switching element (36 3) in the first limb portion group (28) a turn on signal whereby the third switching element (36 3) turns on and begins to conduct current while the current flowing through the first switching element (36) begins to fall to zero and the first switching element (36) prepares to naturally turn off, and to subsequently send a fourth switching element (36 4) in the second limb portion group (30) and a different converter limb (12A, 12C) to the third switching element (36 3) a turn on signal whereby the fourth switching element turns (36 4) on and begins to conduct current while the current flowing through the second switching element (36 2) begins to fall to zero and the second switching element (36 2) prepares to naturally turn off. The control unit (38) also checks for an abnormal current flow (56) associated with the first switching element (36) during a finite monitoring period (42′, 42″; 62′, 62″) to establish whether correct natural turn off of the first switching element (36) occurs.
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