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公开(公告)号：EP3916410A1
公开(公告)日：2021-12-01
申请号：EP21170367.3
申请日：2021-04-26
发明人： DONG, Mingxuan , WANG, Changyong , QIU, Aibin
IPC分类号： G01R31/389
摘要： The application relates to battery internal resistance detection device (1) and method for power conversion device (2). The detection device (1) includes a data acquisition module (4) 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 (5) for receiving the AC current and the AC voltage at a certain instant to output a first internal resistance value (Ri) and a battery capacitance (Cbat), a second calculation module (6) for receiving a plurality of DC currents (I dc1 , I dc •••) and a plurality of DC voltages (U dc1 , U dc2 •••) at multiple instants and the battery capacitance (C bat ) to output a second internal resistance value (R 2 ), and a selection module (7) for receiving the first and second internal resistance value (R 1 , R 2 ) and selecting one of the first and second internal resistance value (R 1 , R 2 ) as battery internal resistance value. The application improves detection accuracy of battery internal resistance by combining DC and AC algorithms.
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公开(公告)号：EP3796541A1
公开(公告)日：2021-03-24
申请号：EP20196879.9
申请日：2020-09-18
发明人： DONG, Mingxuan , WANG, Changyong , CHEN, Li , GUO, Chaowei
IPC分类号： H02M7/5395 , H02M7/5387 , H02P27/08
摘要： The present disclosure provides a method of controlling a switching frequency of a wind power converter, a control device (213, 613) using the method, a wind power generation system (200, 600) using the method. The method includes: obtaining (S102) a three-phase modulation voltage of a generator-side converter (211); adjusting (S104) amplitude of the modulation voltage in k consecutive switching cycles; generating (S106) a PWM pulse signal according to the adjusted modulation voltage; and generating (S108) a control signal of the generator-side converter (211) according to the PWM pulse signal. A frequency of the generated PWM pulse signal is 1/k of a frequency of a first PWM pulse signal, k is an integer equal to or greater than 2, and the frequency of the first PWM pulse signal represents a frequency of a PWM pulse signal generated when the modulation voltage is not adjusted.
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公开(公告)号：EP3849041A1
公开(公告)日：2021-07-14
申请号：EP21150738.9
申请日：2021-01-08
发明人： DONG, Mingxuan , WANG, Changyong , QIU, Aibin
IPC分类号： H02J3/30 , H02J3/32 , H02J1/10 , H02J7/00 , H02J3/38 , H02J7/35 , B60L53/51 , B60L53/53 , B60L53/56
摘要： The present disclosure provides a power supply system method for an AC load (10). The system includes a power supply device (11, 21, 31A, 31B, 41) and a DC/AC converter (12, 22, 32, 42). An AC side of the DC/AC converter is coupled to an AC grid (9) and the AC load through an AC bus (8). The power supply device outputs DC electric energy and is coupled to a DC side of the DC/AC converter through a DC bus (13, 23, 33, 43). The power supply device includes an energy storage circuit (111, 211, 311, 411) and a controller (112, 212, 312, 412). The energy storage circuit includes a first energy storage circuitry (1111, 2111, 3111, 4111) and a second energy storage circuitry (1112, 2112, 3112, 4112). 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.
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