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公开(公告)号：US11777322B2
公开(公告)日：2023-10-03
申请号：US17240761
申请日：2021-04-26
发明人： Li Chen , Changyong Wang , Aibin Qiu
IPC分类号： H02J3/38 , G05B13/04 , H02J3/01 , H02M7/5387
CPC分类号： H02J3/388 , G05B13/042 , H02J3/01 , H02M7/53871
摘要： The present disclosure provides an islanding detection method for an inverter and a corresponding apparatus. The islanding detection method includes: step A1: obtaining a parameter of an output voltage of a three-phase AC system and a steady-state value corresponding to the parameter within a period of time; step A2: obtaining a disturbance signal based on the parameter and the steady-state value; step A3: superimposing the disturbance signal on at least one reference value of a droop control; and step A4: detecting the parameter added with the disturbance signal, and determining that island occurs in response to the parameter greater than an upper limit or less than a lower limit.
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公开(公告)号：US11575264B2
公开(公告)日：2023-02-07
申请号：US17233522
申请日：2021-04-18
发明人： Guoqiao Shen , Changyong Wang , Jinfa Zhang
摘要： A distributed power supply system includes a plurality of energy modules, a plurality of power conversion modules, and a bus voltage controller. The energy modules are electrically connected to a DC bus via corresponding power conversion modules, and the bus voltage controller is connected to the power conversion modules. An energy regulation method includes: acquiring at least one energy state parameter of the corresponding energy module and computing a base value of the respective power conversion module; generating a normalized control signal based on a bus voltage of the DC bus and transmitting the control signal to the power conversion modules by the bus voltage controller; and obtaining a specified control reference value of the power conversion module depending on the control signal and the base value and regulating the corresponding energy module depending on the specified control reference value by the power conversion module.
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公开(公告)号：US20210281072A1
公开(公告)日：2021-09-09
申请号：US17190288
申请日：2021-03-02
发明人： Li Chen , Changyong Wang , Yansong Lu , Aibin Qiu
IPC分类号： H02J3/32 , H02J7/00 , H02J7/02 , H02M7/219 , H02M7/5387
摘要： An energy storage device for a power system is provided. The energy storage device is electrically connected with a high voltage DC transmission grid. The energy storage device includes at least one energy storage element, at least one bidirectional inverter module, at least one medium frequency transformer and at least one bidirectional AC/DC conversion module. A DC terminal of each bidirectional inverter module is electrically connected with the corresponding energy storage element. A first transmission terminal of each medium frequency transformer is electrically connected with an AC terminal of the corresponding bidirectional inverter module. An AC terminal of each bidirectional AC/DC conversion module is electrically connected with a second transmission terminal of the corresponding medium frequency transformer. A DC terminal of each bidirectional AC/DC conversion module is electrically connected with the high voltage DC transmission grid.
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公开(公告)号：US10411474B2
公开(公告)日：2019-09-10
申请号：US15410207
申请日：2017-01-19
发明人： Changyong Wang , Fei Lu
摘要： An electric power system includes a variable-frequency drive and a control module. The variable-frequency drive includes a first power converter, a second power converter and at least one energy storage module. The first power converter is connected between a DC bus and a power terminal. Moreover, electric energy is transferred between the first power converter and the power terminal at a first power. The second power converter is connected between the DC bus and an electric/kinetic energy conversion device. Moreover, electric energy is transferred between the second power converter and the electric/kinetic energy conversion device at a second power. As the second power is dynamically changed, the control module controls a charge/discharge operation of the at least one energy storage module. As a consequence, the operational change of the electric/kinetic energy conversion device is reversely compensated.
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公开(公告)号：US20240186791A1
公开(公告)日：2024-06-06
申请号：US18523788
申请日：2023-11-29
发明人： Haidong Chen , Yafeng Wang , Yansong Lu , Linfeng Zhong , Changyong Wang
IPC分类号： H02J3/12 , H01M10/44 , H01M10/46 , H01M50/204 , H01M50/296 , H02J7/00 , H02M1/00 , H02M3/335
CPC分类号： H02J3/12 , H01M10/441 , H01M10/46 , H01M50/204 , H01M50/296 , H02J7/0013 , H02J7/0047 , H02M1/0067 , H02M3/33584 , H02J2207/20
摘要： An energy storage system includes a DC bus, an energy storage converter, n first battery racks and m energy storage units. The DC bus has a positive bus and a negative bus. The energy storage converter is electrically connected to the DC bus. Each of the n first battery racks is electrically connected between the positive bus and the negative bus directly. Each of the m energy storage units includes a second battery rack and a DC/DC converter. The DC/DC converter is electrically connected between the corresponding second battery rack and the DC bus. The DC/DC converter performs electric energy conversion between the corresponding second battery rack and the DC bus.
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公开(公告)号：US20240136841A1
公开(公告)日：2024-04-25
申请号：US18240482
申请日：2023-08-30
发明人： Tengshen Zhang , Jinfa Zhang , Linfeng Zhong , Changyong Wang , Yafeng Wang
CPC分类号： H02J7/00714 , H02J7/0013 , H02M1/0048 , H02M1/0067 , H02M1/0095 , H02M3/01 , H02M3/07 , H02M3/33571 , H02M3/33584 , H02J2207/20
摘要： An energy storage module includes a bus connection part, a battery pack, a capacitor and a series compensation DC conversion device. A first conduction terminal of the series compensation DC conversion device is electrically connected with a positive bus connection terminal and a negative bus connection terminal of the bus connection part, or the first conduction terminal is connected with a battery positive terminal and a battery negative terminal of the battery pack. A second conduction terminal of the series compensation DC conversion device is electrically connected with two terminals of the capacitor. A four-quadrant DC/DC converter of the series compensation DC conversion device controls the capacitor to generate a compensation voltage to compensate a voltage between the two terminals of the battery pack, or the four-quadrant DC/DC converter adjusts a current flowing through the battery pack to a set value.
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公开(公告)号：US11476671B2
公开(公告)日：2022-10-18
申请号：US17073196
申请日：2020-10-16
发明人： Changyong Wang , Yansong Lu
摘要： A wind power converting device includes a plurality of grid-side converters, a plurality of generator-side converters and a plurality of DC buses. The grid-side converters are connected with each other in series and electrically coupled to a power grid. The generator-side converters are connected with each other in series and electrically coupled to a generator device. The DC buses are electrically coupled between the grid-side converters and the generator-side converters. The DC buses include a positive DC bus, a negative DC bus and at least one intermediate DC bus between the positive DC bus and the negative DC bus. A cross section area of a conductor of the intermediate DC bus is smaller than 30% of a cross section area of a conductor of the positive DC bus or smaller than 30% of a cross section area of a conductor of the negative DC bus.
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公开(公告)号：US12027909B2
公开(公告)日：2024-07-02
申请号：US17457918
申请日：2021-12-07
发明人： Guoqiao Shen , Ning He , Changyong Wang
CPC分类号： H02J7/342 , H02J1/102 , H02J2207/20 , H02J2300/24 , H02M1/007 , H02M1/0093 , H02M3/1582
摘要： The application discloses a power conversion system and a controlling method of the same. The power conversion system includes: n choppers, comprising n switching arms connected in parallel, each chopper including: the switching arm, an inductor having a first end connected to a midpoint of the switching arm, and a first capacitor connected in parallel to the switching arm; and n DC components corresponding to the n choppers with a one-to-one relation, wherein one of the DC components is a DC power supply or a DC load, first ends of the DC components are connected together, and a second end of each of the DC components is connected to a second ends of the inductor of the corresponding chopper, where n is a natural number of 2 or more.
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公开(公告)号：US11799293B2
公开(公告)日：2023-10-24
申请号：US17190718
申请日：2021-03-03
发明人： Li Chen , Changyong Wang , Yansong Lu , Aibin Qiu
CPC分类号： H02J3/36 , H02J3/381 , H02M3/33569 , H02J3/388 , H02J2300/28 , H02J2310/18 , H02M1/0074
摘要： A high-voltage DC transformation apparatus, a power system and a control method of the power system. The high-voltage DC transformation apparatus is electrically connected to at least one high-voltage DC power generator. The high-voltage DC transformation apparatus includes at least one bidirectional AC/DC conversion module, at least one first transformer and at least one unidirectional rectifier module. A DC terminal of the bidirectional AC/DC conversion module is electrically connected to the corresponding high-voltage DC power generator. The first transformer includes a first transmission terminal and a second transmission terminal. The first transmission terminal is electrically connected to an AC terminal of the corresponding bidirectional AC/DC conversion module. The unidirectional rectifier module includes an input terminal and an output terminal. The input terminal is electrically connected to the second transmission terminal of the corresponding first transformer, and the output terminal is electrically connected to a high-voltage grid.
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公开(公告)号：US20230081860A1
公开(公告)日：2023-03-16
申请号：US17886890
申请日：2022-08-12
发明人： Wei Guan , Zhiguang Gao , Jun Chen , Yansong Lu , Changyong Wang
摘要： An energy storage system is provided. The energy storage system includes a plurality of battery clusters, a plurality of power regulators, a transformer, and a central controller. The plurality of power regulators is configured to control charging and discharging of the plurality of battery clusters. Each power regulator is electrically coupled to corresponding two, at most, of the plurality of battery clusters. A first terminal of the transformer is electrically coupled to the plurality of power regulators, and a second terminal of the transformer is electrically coupled to the power grid. The central controller is coupled to the plurality of power regulators and the plurality of battery clusters for controlling the plurality of power regulators and the plurality of battery clusters. The central controller is in communication with the plurality of power regulators through optical fibers, and a data transmission rate of the optical fibers is greater than 1 Mbit/s.
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