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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：US20200328740A1
公开(公告)日：2020-10-15
申请号：US16304864
申请日：2017-05-26
IPC分类号： H03K17/567 , H02M1/088
摘要： A switching valve includes series-connected switching elements and auxiliary circuits. Each auxiliary circuit is connected in parallel with a respective one of the series-connected switching elements. Each auxiliary circuit includes a respective auxiliary capacitor. The method includes carrying out a compensation procedure. The compensation procedure includes: initiating a turn-off event by sending a respective turn-off control signal to each switching element; measuring a respective capacitor voltage value of each auxiliary capacitor after the turn-off event; comparing the measured capacitor voltage values; and using the comparison between the measured capacitor voltages as a reference to adjust the time of sending a or a respective turn-off control signal to at least one of the switching elements so as to reduce a or a respective time difference between the turn-off times of the switching elements at the next turn-off event.
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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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