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公开(公告)号：US20170307688A1
公开(公告)日：2017-10-26
申请号：US15513350
申请日：2015-09-16
IPC分类号： G01R31/333 , H02M5/458
CPC分类号： G01R31/3336 , G01R31/3272 , H02M3/158 , H02M5/4585 , H02M2007/4835
摘要： A synthetic test circuit, comprising: a device under test including a chain-link converter under test, comprising a plurality of test modules, each test module including module switches connected with an energy storage device; a terminal connected to the device under test; at least one injection circuit operably connected to the terminal, the injection circuit including a source, the source including a source chain-link converter, which includes a plurality of source modules, each source module including a plurality of module switches connected with at least one energy storage device; a controller being configured to operate each source module to selectively bypass the corresponding energy storage device and insert the corresponding energy storage device into the corresponding source chain-link converter so as to generate a voltage across the source chain-link converter and thereby operate the injection circuit to inject a current waveform and/or a voltage waveform into the chain-link converter under test.
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公开(公告)号：US20190028021A1
公开(公告)日：2019-01-24
申请号：US16081440
申请日：2017-03-01
发明人： Javier Francisco CHIVITE-ZABALZA , David Reginald TRAINER , Jonathan Christopher NICHOLLS , Konstantin VERSHININ , Ikenna Bruce EFIKA , Francisco Jose MORENO MUNOZ , John Lewis OUTRAM , Rajaseker Reddy GINNAREDDY
CPC分类号： H02M1/34 , H02J3/36 , H02J7/345 , H02M1/32 , H02M7/49 , H02M7/797 , H02M2001/325 , H02M2001/348 , H02M2007/4835 , Y02E60/60
摘要： Fault protection of a voltage source converter is provided. An apparatus has a chain-link circuit in series with a director switch. The chain-link circuit includes cells including an energy storage element and cell switching elements connected with anti-parallel diodes. Each cell switching element has a cell switching element controller. The director switch includes director switch units, each having a director switching element and a director switch unit controller. Each cell switching element controller monitors for a fault current and turns-off its associated cell switching element and reports a fault event to a fault controller. Each director switch unit controller monitors for a fault current and reports a fault event to the fault controller but the director switch unit control keeps its associated director switching element turned-on. The fault controller monitors for reports of fault events to order the cell switching elements of at least some of the cells to turn-off.
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公开(公告)号：US20160141969A1
公开(公告)日：2016-05-19
申请号：US14899528
申请日：2014-06-16
IPC分类号： H02M5/44
CPC分类号： H02M5/44 , H02J3/02 , H02J3/36 , H02M2007/4835 , Y02E60/60
摘要： An electrical assembly includes a DC tap including first and second tap terminals that are respectively connectable to first and second DC power transmission media, the DC tap including a tap limb extending between the first and second tap terminals and having two limb portions separated by a third tap terminal connectable to an electrical load, each tap limb portion including a DC blocking capacitor. The assembly further includes a current return configured to electrically interconnect the or each AC terminal to the third tap terminal, a converter unit, and a controller configured to selectively control the converter unit to generate at least one first non-fundamental frequency alternating current component at the or each AC terminal and modify the or each first non-fundamental frequency alternating current component to enable the DC tap to draw power from the DC electrical network for supply to the electrical load.
摘要翻译： 一种电气组件包括一个包括可分别连接到第一和第二DC电力传输介质的第一和第二抽头端子的DC抽头，该DC抽头包括在第一和第二抽头端子之间延伸的抽头分支，并具有由第三和第二分接头 抽头端子可连接到电负载，每个抽头分支部分包括直流阻塞电容器。 组件还包括电流返回器，其被配置为将该AC端子或每个AC端子电连接到第三抽头端子，转换器单元和被配置为选择性地控制转换器单元以产生至少一个第一非基频交流分量的控制器 该AC端子或每个AC端子并且修改该或每个第一非基频交流分量，以使DC分接头能够从DC电网抽取电力以供应到电负载。
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公开(公告)号：US20190068081A1
公开(公告)日：2019-02-28
申请号：US16077258
申请日：2017-02-09
发明人： David Reginald TRAINER , Francisco Javier CHIVITE-ZABALZA , Konstantin VERSHININ , Robert WHITEHOUSE , Jonathan Christopher NICHOLLS
IPC分类号： H02M7/487 , H02M1/32 , H02M7/757 , H02M7/5387
摘要： A converter includes first and second DC terminals for connection to a DC network, limb(s) connected between the first and second DC terminals, and a controller. Each limb includes a phase element and DC side sub-converter(s). The phase element has switching elements and AC terminal(s) for connection to an AC network, the switching elements being switchable to selectively interconnect a DC side voltage at a DC side of the phase element and an AC side voltage at an AC side of the phase element, The DC side sub-converter(s) connected to the DC side of the phase element. The controller selectively controls the switching elements and the operation of each DC side sub-converter as a voltage synthesiser. The controller also controls the switching elements to provide a blocking voltage to limit or block the flow of a fault current between the AC and DC networks and through each limb.
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公开(公告)号：US20180241321A1
公开(公告)日：2018-08-23
申请号：US15751686
申请日：2016-08-17
发明人： Robert WHITEHOUSE , Colin Donald Murray OATES , David Reginald TRAINER , Francisco Javier CHIVITE ZABALZA
CPC分类号： H02M7/797 , H02J3/36 , H02J2003/365 , H02M1/12 , H02M7/483 , H02M2007/4835
摘要： This application relates to a voltage source converter, especially for use in High Voltage Direct Current power distribution/transmission, and to methods of control of such a voltage source converter. The voltage source converter has at least one phase limb having a high-side DC terminal, a low-side DC terminal and an AC terminal. In embodiments of the invention each phase limb comprises a voltage wave-shaper operable, in use, to provide a selectively variable voltage level. Each phase limb also has a switch arrangement operable to provide at least first and second switch states. In the first switch state the low-side DC terminal is electrically connected to the AC terminal via a first path that includes the voltage wave-shaper. In the second switch state the high-side DC terminal is electrically connected to the AC terminal via a second path that includes the voltage wave-shaper.
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公开(公告)号：US20190013742A1
公开(公告)日：2019-01-10
申请号：US15748719
申请日：2016-08-04
发明人： Pablo BRIFF , David Reginald TRAINER , Francisco Jose MORENO-MUNOZ , Francisco Javier CHIVITE-ZABALZA
摘要： A voltage source converter includes DC terminals for connection to a DC network, a plurality of converter limbs between the DC terminals, and a controller. Each converter limb includes first and second limb portions separated by a respective AC terminal, the AC terminal of each converter limb connecting to a multi-phase AC network. Each limb portion extends between a corresponding DC terminal and AC terminal. Each limb portion including a valve having switching element(s) and energy storage device(s), the switching element being switchable to selectively insert the energy storage device into the limb portion and bypass the energy storage device to control a voltage across that valve. The controller is programmed to control the switching of valves to form a current circulation path including the limb portions corresponding to the selected valves, the AC phases connected to the limb portions corresponding to the selected valves, and the DC network.
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公开(公告)号：US20180367134A1
公开(公告)日：2018-12-20
申请号：US16061921
申请日：2016-12-02
IPC分类号： H03K17/10 , H02M1/088 , H03K17/284 , H03K17/693
摘要： This application relates to methods and apparatus for voltage balancing of voltage source converters and especially for voltage balancing of clamp capacitors of a director switch of a voltage source converter. Typically a director switch of a voltage source converter includes series connected director switch units, each having a semiconductor switching element. In some voltage source converter designs each director switch unit has an associated clamp capacitor. The method of controls involves switching the semiconductor switching elements of the director switch units to transition the director switch between conducting and non-conducting states where the timing of switching of a semiconductor switching element is based on the voltage level of the associated clamp capacitor and also the degree of any voltage imbalance between the clamp capacitors of the director switch units. A control apparatus may determine suitable switching control signals.
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公开(公告)号：US20180175744A1
公开(公告)日：2018-06-21
申请号：US15576492
申请日：2016-05-20
CPC分类号： H02M7/797 , H02M1/12 , H02M1/14 , H02M1/15 , H02M7/483 , H02M2001/0074 , H02M2001/325 , H02M2007/4835
摘要： A method of controlling a converter including DC terminals for connection to a DC network, the converter including a limb between the DC terminals, each limb including a phase element having switching elements and a AC terminal for connection to an AC network, the switching elements being configured to switch interconnecting a DC and AC side voltage; a sub-converter connected in series with the DC side of an electrical block and controllably become a first voltage source; and a sub-converter connected in parallel with the block, configured to controllably become a second voltage source. The method includes obtaining a DC side voltage and converter demand which the corresponding limb and converter track; determining a sub-converter voltage that each sub-converter must contribute to track the corresponding required DC side and converter voltage; controlling each sub-converter to achieve the corresponding determined voltage; and determining one or more optimal sub-converter voltages.
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公开(公告)号：US20180034382A1
公开(公告)日：2018-02-01
申请号：US15553243
申请日：2016-02-19
CPC分类号： H02M7/217 , H02J3/36 , H02M1/08 , H02M7/483 , H02M2001/0054 , H02M2007/4835 , Y02B70/1491 , Y02E60/60
摘要： Methods and apparatus for hard switching of Alternate-Arm-Converter voltage source converters. Such voltage source converters have a phase limb with a high and low side converter arm connecting an AC terminal to a high and low side DC terminal, respectively comprising a chain-link circuit in series with a director switch. Each chain-link circuit comprises series connected cells that can be switched to generate a controlled voltage across the chain-link circuit. In embodiments, a controller turns-off the director switch of a converter arm that is conducting current in response to a hard-switching request for a first phase limb. In response to a hard-switching request, the controller controls the chain-link circuits of the first phase limb at any point in a phase cycle to control: a DC voltage across the director switch; and/or the current flowing through the director switch to a predetermined level before turning the director switch off.
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公开(公告)号：US20170126015A1
公开(公告)日：2017-05-04
申请号：US15317818
申请日：2015-06-09
IPC分类号： H02J4/00
CPC分类号： H02J4/00 , H02M7/483 , H02M7/7575 , H02M2001/344 , H02M2007/4835 , Y02E60/60
摘要： A semiconductor switching circuit, for use in a HVDC power converter, includes a main current branch including a main semiconductor switching element through which current flows when the main semiconductor switching element is switched on; and an auxiliary current branch connected in parallel or inverse-parallel with the main current branch. The auxiliary current branch includes an auxiliary circuit having a plurality of active auxiliary semiconductor switching elements connected to form an active switching bridge, and the auxiliary current branch further includes an energy storage device and/or an impedance device. The active switching bridge has a control unit operatively connected therewith, and the control unit is configured to switch the active switching bridge to connect the auxiliary circuit into and out of circuit with the main current branch and thereby selectively create an alternative current path whereby current flowing through the main current branch is diverted to flow through.
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