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公开(公告)号：US10516259B2
公开(公告)日：2019-12-24
申请号：US15321828
申请日：2014-06-27
发明人： Christian Blug , Guenter Ebner , Li Shang-Jaeger , Kai Trunk , Klaus Wuerflinger , Marcus Zeller
摘要： A method and a device provide protection for a multi-terminal HVDC grid against faults. The method includes measuring a DC displacement voltage having a polarity and a value, determining if a short circuit fault exists by comparing the DC displacement voltage with a threshold displacement voltage and identifying a fault type based on the polarity and the value of the DC displacement voltage. The disclosed device contains a converter having a positive pole and a negative pole, a DC-switch substation, a DC line connecting the converter and the DC-switch substation and a transient fault detector. The transient fault detector contains a positive voltage sensor sensing a positive transient voltage of the positive pole and a negative voltage sensor sensing a negative transient voltage of the negative pole and a control unit which is adapted to derive a DC displacement voltage from the positive and the negative transient voltages.
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2.发明授权公开(公告)号：US10199922B2
公开(公告)日：2019-02-05
申请号：US15323328
申请日：2014-07-01
IPC分类号： H02M1/32 , H02M7/5395 , H02M7/483 , H02M1/00
摘要： A sub-module of a modular braking unit that is connected to a DC transmission network. Each sub-module has an inverse diode, and a storage capacitor connected in parallel with the inverse diode via a free-wheeling diode. An energy-consuming switching unit is connected to the storage capacitor. In order to provide a sub-module of this type such that the braking unit can function with relatively low losses in the stand-by and idle state, the sub-module is provided with an actively switchable semiconductor bypass path in parallel with the inverse diode. A braking unit has a plurality of series-connected sub-modules and we disclose a method for operating a braking unit of this type.
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3.发明授权公开(公告)号：US11283440B2
公开(公告)日：2022-03-22
申请号：US17045232
申请日：2018-04-03
摘要： A circuit arrangement has an even number of semiconductor switches, which are connected in series and contain in each case two load terminals and a control terminal and are associated with one another in pairs. The circuit arrangement also contains, for each semiconductor switch, a driver for actuating the semiconductor switch via the control terminal thereof and, for every two semiconductor switches that form a switch pair, contains a switching power supply which is supplied with energy from an electrical voltage between the two load terminals of a first semiconductor switch of the switch pair and supplies both the driver of the first semiconductor switch and the driver of the second semiconductor switch of the switch pair with energy.
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公开(公告)号：US11245395B2
公开(公告)日：2022-02-08
申请号：US17048218
申请日：2018-04-16
IPC分类号： H03K17/567
摘要： A circuit arrangement includes two switching group series circuits of switch assemblies, switch-mode power supply units, and two capacitor bridges connecting the switching group series circuits. Each switch assembly has a parallel circuit of a semiconductor switch and a freewheeling diode as well as a driver for actuating the semiconductor switch. Each switch-mode power supply unit is associated with a switch pair of semiconductor switches and supplies the drivers of both semiconductor switches of the switch pair with energy. Each switch pair is formed by a semiconductor switch of a first switching group series circuit and a semiconductor switch of a second switching group series circuit. A power convertor module having the circuit arrangement is also provided.
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公开(公告)号：US20210159899A1
公开(公告)日：2021-05-27
申请号：US17048218
申请日：2018-04-16
IPC分类号： H03K17/567
摘要： A circuit arrangement includes two switching group series circuits of switch assemblies, switch-mode power supply units, and two capacitor bridges connecting the switching group series circuits. Each switch assembly has a parallel circuit of a semiconductor switch and a freewheeling diode as well as a driver for actuating the semiconductor switch. Each switch-mode power supply unit is associated with a switch pair of semiconductor switches and supplies the drivers of both semiconductor switches of the switch pair with energy. Each switch pair is formed by a semiconductor switch of a first switching group series circuit and a semiconductor switch of a second switching group series circuit. A power convertor module having the circuit arrangement is also provided.
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公开(公告)号：US09647529B2
公开(公告)日：2017-05-09
申请号：US14763247
申请日：2013-01-24
发明人： Mike Dommaschk , Guenter Ebner , Klaus Wuerflinger
摘要： Electric power is transferred between an AC voltage grid and a DC voltage grid in the high-voltage range. Phase modules have at least one common DC voltage connection and separate AC voltage connections. A phase module branch between the DC voltage connection and each AC voltage connection has a series circuit of two-pole sub-modules, each with an energy storage device and a power semiconductor circuit in parallel with the energy storage device. The power semiconductor circuit is driven to generate either the voltage drop across the energy storage device or else a zero voltage at the two sub-module connection terminals. A converter transformer has a primary side on an AC voltage grid and a secondary side connected to the AC voltage connections. Improved protection against overloading is provided by at least one surge arrester between the or one of the common DC voltage connections and the inverter neutral point.
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