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公开(公告)号：US20240310424A1
公开(公告)日：2024-09-19
申请号：US18122911
申请日：2023-03-17
Applicant: Hamilton Sundstrand Corporation
Inventor： Tyler W. Hayes
CPC classification number: G01R31/086 , H02J3/36
Abstract: A system includes four high voltage direct current (HVDC) feeders, each having a first contactor configured for selectively connecting a positive terminal of an HVDC source to the respective HVDC feeder, and having a second contactor configured for selectively connecting the respective HVDC feeder to an HVDC bus. A power converter can be configured to use feedback to locate a fault when a fault arises, and to isolate the fault by opening of the contactors as needed for continued operation of as many of the HVDC feeders as possible after clearing the fault.
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公开(公告)号：US20240305103A1
公开(公告)日：2024-09-12
申请号：US18027332
申请日：2022-06-10
Applicant: Ace Power and Technology Co.,Ltd
Inventor： Yuetian WANG
Abstract: The present disclosure provides a power supply system and a power supply method, which can be applied to the field of power distribution technologies. The power supply system comprises: a DC rectifying device, an industrial frequency transformer and at least two power supply devices, wherein the industrial frequency transformer is connected between the power supply device and the DC rectifying device, and the DC rectifying device is further connected to a load. The power supply system and the power supply method according to the embodiments of the present disclosure reduce the development cost and the development period of the power supply system.
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3.发明公开公开(公告)号：US20240305102A1
公开(公告)日：2024-09-12
申请号：US18597218
申请日：2024-03-06
Applicant: TRANSGRID SOLUTIONS INC.
Inventor： MOJTABA MOHADDES KHORASSANI
CPC classification number: H02J3/36 , H02J3/1842
Abstract: A control method for a grid following voltage source converter (VSC) that does not require a phased locked loop (PLL) allows the VSC to operate stably with an AC system with any strength. The voltage reference for converter valves of a controller of the VSC is produced by a proportional controller and the input to the proportional controller is the difference between the reference and the actual converter instantaneous current values. The instantaneous reference converter current waveform for each phase is generated by adding a scaled version of the voltage waveform of the same phase and a 90 degrees phase shifted waveform of the same. The instantaneous reference current waveform for each phase is multiplied by a gain K_I which is adjusted automatically based on the sum of the differences between the absolute values (or magnitudes) of the actual converter instantaneous phase currents and the reference converter instantaneous phase currents.
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公开(公告)号：US20240288482A1
公开(公告)日：2024-08-29
申请号：US18600022
申请日：2024-03-08
Applicant: University of Manitoba
CPC classification number: G01R31/085 , H02J3/0012 , H02J3/36 , H02J13/00002 , H02J2203/20
Abstract: There is disclosed a method for identifying one or more faulted conductors in a power transmission system having at least two power-transmitting conductors and a method for determining fault location. Both methods include steps of monitoring current signals which are representative of currents in the conductors at a generally common location within the power transmission system; filtering the current signals; determining a maximum rate of change of each filtered current signal within a predetermined time interval after the fault event has commenced; and calculating a ratio of a pair of the maximum rates of change of the filtered current signals. For fault classification, the ratio is compared against a discrimination factor to identify the one or more faulted conductors. For fault location, the calculated ratio is compared against the calibration data to determine the distance from the connection terminal of the faulted conductor to the fault location.
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公开(公告)号：US12074535B2
公开(公告)日：2024-08-27
申请号：US17439574
申请日：2019-04-25
Applicant: Mitsubishi Electric Corporation
Inventor： Ryosuke Uda , Takeshi Kikuchi , Shuhei Fujiwara , Yoshiyuki Kono
CPC classification number: H02M7/4835 , H02J3/36 , H02J3/388 , H02M1/0025 , H02M7/79
Abstract: A control device includes: a phase generation unit to generate a phase of a voltage command for the power converter; a voltage control unit to generate a voltage value of the voltage command; and a command unit to output the voltage command having the phase and the voltage value to the power converter. The voltage control unit includes: a voltage compensator unit to compute a compensation voltage value, based on a voltage deviation of a point-of-interconnection voltage from a reference voltage; a droop calculator unit to compute a first droop value in accordance with a magnitude of a point-of-interconnection current, when the AC power system is an isolated system, the isolated system being the AC power system not connected to a generator; and a calculation unit to calculate the voltage value of the voltage command, based on a difference between the compensation voltage value and the first droop value.
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Patent Agency Ranking
公开(公告)号：US12040606B2
公开(公告)日：2024-07-16
申请号：US17399740
申请日：2021-08-11
Applicant: ZHEJIANG UNIVERSITY
Inventor： Zheren Zhang , Zheng Xu , Yuzhe Xu
CPC classification number: H02H7/1216 , H02H1/0007 , H02J3/36
Abstract: The present disclosure discloses a resistive sub-module hybrid MMC and a direct current fault processing strategy thereof. The hybrid MMC prevents fault current from entering a direct current system from the alternating current side by artificially creating three-phase earthing short circuit on the alternating current side of a converter during the direct current fault processing process, and can reduce the number of required power electronic devices compared with the module hybrid MMC. At the same time, the direct current fault processing speed of the hybrid MMC is fast, and the duration of the artificially creating three-phase short circuit fault in the fault processing process is less than 60 ms, which will not have a great impact on the alternating current system. The present disclosure greatly reduces the cost of building an overhead line high-voltage flexible direct current transmission system, and has very strong reference significance and use value in engineering.
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公开(公告)号：US12027996B2
公开(公告)日：2024-07-02
申请号：US18273155
申请日：2023-01-17
Applicant: SHANDONG UNIVERSITY
Inventor： Jingyang Fang , Hongchang Li , Feng Gao , Xu Yang
IPC: H02M7/5387 , H02J3/32 , H02J3/36 , H02M7/5388
CPC classification number: H02M7/53871 , H02J3/32 , H02J3/36 , H02M7/5388
Abstract: A fractal power converter and a method for constructing the fractal power converter, the method for constructing the fractal converter including: replacing a switch and/or an energy storage element of an asymmetric half-bridge sub-module with the same asymmetric half-bridge sub-module for at least two times, replacing a switch and/or an energy storage element of a symmetric half-bridge sub-module with the same symmetric half-bridge sub-module for at least two times, and replacing a switch and/or an energy storage element of an H-bridge sub-module with the same H-bridge sub-module for at least two times. Compared with a conventional high-voltage and large-current power converter, the fractal power converter may output any high-voltage and large-current waveform. The system is modularized, the structure is simple and extensible, and voltage and current may be evenly distributed among the modules. The control method is simple and easy to standardize. Multi-port parallel output is allowed.
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公开(公告)号：US20240204528A1
公开(公告)日：2024-06-20
申请号：US17798078
申请日：2021-06-06
Inventor： Hong Rao , Changyue Zou , Shukai Xu , Yan Li , Xiaobin Zhao , Weiwei Li , Junjie Feng , Shuangfei Yang , Ting Hou , Lingfei Li , Yuke Ji
CPC classification number: H02J3/34 , H02J3/01 , H02J3/1807 , H02J3/36 , H02M1/0048 , H02M1/12 , H02M7/4835 , H02J2003/365
Abstract: The present disclosure provides a parameter design method for a series passive impedance adapter applicable to a VSC-HVDC transmission system, to resolve the technical problem that high-frequency resonance may occur when impedance of a VSC-HVDC transmission system is mismatched with that of a sending-end or receiving-end grid. A parameter design goal of the present disclosure is that reactive power consumed by a series passive impedance adapter is not more than A times rated power of a converter, and a loss of the series passive impedance adapter in a fundamental wave is B times the rated power of the converter. The parameter design method for a series passive impedance adapter applicable to a VSC-HVDC transmission system in the present disclosure can realize a positive impedance characteristic within a concerned frequency band and completely eliminate a risk of harmonic resonance.
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公开(公告)号：US12009663B2
公开(公告)日：2024-06-11
申请号：US17771358
申请日：2020-08-05
Applicant: Zhejiang University
Inventor： Zheng Xu , Yingjie Tang , Zheren Zhang
Abstract: The present disclosure discloses an offshore wind farm low-frequency alternating-current uncontrolled rectification electric power transmission system, comprising an onshore converter station and an offshore alternating-current system. The offshore alternating-current system comprises wind turbine generators, alternating-current submarine cables, a confluence bus, and offshore booster stations; the onshore converter station comprises a wind field side alternating-current bus, an alternating-current system side alternating-current bus, an alternating-current filter, an energy dissipation device, a rectifier, and a converter; the rectifier is composed of a three-phase six-pulse uncontrolled rectifier bridge, and the converter may be an MMC or an LCC; the rated frequency of the offshore alternating-current system is selected to be close to 10 Hz.
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10.发明公开公开(公告)号：US20240162714A1
公开(公告)日：2024-05-16
申请号：US18552666
申请日：2021-09-13
Inventor： Chuang FU , Ruina ZHENG , Juanjuan WANG , Zhaoxin WEN , Huan LI , Wei WEI
CPC classification number: H02J3/36 , H02J3/001 , H02M7/48 , H02J2203/00
Abstract: A method, an apparatus and a device for suppressing a first HVDC commutation failure under an AC system fault are provided. The method includes: obtaining a three-phase voltage of a converter bus, and calculating a zero-sequence component amplitude and an αβ component amplitude; calculating a first trigger-angle command for a single-phase fault and a second trigger-angle command for a three-phase fault selecting a smaller one of the first trigger angle command and the second trigger angle command as a trigger-angle command for an extinction-angle controller; and adjusting a trigger angle of the HVDC transmission system by using the trigger-angle command as an upper limit value for an output of the extinction-angle controller of the HVDC transmission system.
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