-
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.
-
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.
-
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.
-
公开(公告)号：US10784683B2
公开(公告)日：2020-09-22
申请号：US15990063
申请日：2018-05-25
发明人： Mingxuan Dong , Changyong Wang , Aibin Qiu
IPC分类号： H02J3/28 , H02J7/00 , H02M7/797 , H02J3/32 , H02J3/38 , H02M5/458 , H02P9/00 , H02J7/34 , H02M1/00 , H02P101/15
摘要： The present application provides a method of controlling an electrical power system and an apparatus using the same. The electrical power system includes a DC bus and a DC bus capacitor connected to the DC bus. The method includes: receiving a virtual DC bus capacitance value of the DC bus capacitor; detecting a DC bus voltage; calculating an expected value of a DC bus current based on the virtual DC bus capacitance value and the DC bus voltage; and adjusting the DC bus current, so that the DC bus current reaches the expected value and thus the DC bus capacitor is equivalent to the virtual DC bus capacitance value.
-
公开(公告)号：US11936310B2
公开(公告)日：2024-03-19
申请号：US17237409
申请日：2021-04-22
发明人： Li Chen , Changyong Wang , Aibin Qiu
IPC分类号： H02P21/05
CPC分类号： H02P21/05
摘要： The present disclosure provides a three-phase AC system and a control method thereof. The method includes: receiving an output signal of the three-phase AC system and obtaining a characteristic value of the output signal according to the output signal; performing virtual synchronous generator control on the inverter to obtain a fundamental electric potential; extracting a harmonic component from the output signal and obtaining an error signal according to the harmonic component and a reference value of the harmonic component; controlling the error signal to obtain a harmonic compensation electric potential; obtaining a control electric potential by superimposing the harmonic compensation electric potential with the fundamental electric potential; obtaining a pulse signal by modulating the control electric potential, and obtaining a switching signal of the inverter according to the pulse signal.
-
公开(公告)号：US11799306B2
公开(公告)日：2023-10-24
申请号：US17238214
申请日：2021-04-23
发明人： Mingxuan Dong , Changyong Wang , Aibin Qiu
IPC分类号： H02J7/00 , G01R31/389
CPC分类号： H02J7/0047 , G01R31/389 , H02J7/007 , H02J7/0029 , H02J2207/20
摘要： The application relates to battery internal resistance detection device and method for power conversion device. The detection device includes a data acquisition module for acquiring a battery voltage and a battery current to obtain a DC voltage, an AC voltage, a DC current and an AC current, a first calculation module for receiving the AC current and the AC voltage at a certain instant to output a first internal resistance value and a battery capacitance, a second calculation module for receiving a plurality of DC currents and a plurality of DC voltages at multiple instants and the battery capacitance to output a second internal resistance value, and a selection module for receiving the first and second internal resistance value and selecting one of the first and second internal resistance value as battery internal resistance value. The application improves detection accuracy of battery internal resistance by combining DC and AC algorithms.
-
公开(公告)号：US11239663B2
公开(公告)日：2022-02-01
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.
-
公开(公告)号：US11218001B2
公开(公告)日：2022-01-04
申请号：US17134238
申请日：2020-12-25
发明人： Mingxuan Dong , Changyong Wang , Aibin Qiu
摘要： The present disclosure provides a power supply system method for an AC load. The system includes a power supply device and a DC/AC converter. An AC side of the DC/AC converter is coupled to an AC grid and the AC load through an AC bus. The power supply device outputs DC electric energy and is coupled to a DC side of the DC/AC converter through a DC bus. The power supply device includes an energy storage circuit and a controller. The energy storage circuit includes a first energy storage circuitry and a second energy storage circuitry. The controller is configured to control a conversion operation of the first energy storage circuitry to output a low-frequency power to the DC bus, and a conversion operation of the second energy storage circuitry to output a high-frequency power to the DC bus.
-
公开(公告)号：US20210281183A1
公开(公告)日：2021-09-09
申请号：US17190718
申请日：2021-03-03
发明人： Li Chen , Changyong Wang , Yansong Lu , Aibin Qiu
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.
-
-
-
-
-
-
-
-
搜索结果
9 条记录 (耗时 0.017 秒)
