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公开(公告)号：US20240136815A1
公开(公告)日：2024-04-25
申请号：US18395643
申请日：2023-12-25
发明人： Zhangping Shao , Kai Xin , Congyuan Wang
CPC分类号： H02J3/00125 , H02J3/0012 , H02J3/01 , H02J3/16 , H02J3/24 , H02J2300/24
摘要： This application provides a power supply system and a conversion method. The power supply system includes a power generation apparatus, a converter circuit, and a drive control circuit. The drive control circuit may be configured to: when a power grid fails, control, based on duration of previous low voltage ride-through, the converter circuit to increase a value of a current to be output to the power grid from a first operating current value to a low voltage ride-through current value, to increase a voltage value at an output end of the converter circuit. Herein, the previous low voltage ride-through is latest low voltage ride-through. In this application, the system can control, based on duration of previous voltage ride-through, a current to be output by the converter circuit to the power grid, to reduce circuit oscillation, with a simple structure, a simple control method, and high safety.
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公开(公告)号：US20230178989A1
公开(公告)日：2023-06-08
申请号：US18151987
申请日：2023-01-09
发明人： Zhangping Shao , Kai Xin , Haibin Guo
IPC分类号： H02J3/18 , H02M7/66 , H02J3/00 , G05B19/042
CPC分类号： H02J3/18 , G05B19/042 , H02J3/001 , H02M7/66 , G05B2219/2639
摘要： A current control method and system for a voltage asymmetry fault is disclosed. When a voltage asymmetry fault occurs, a first current limit value is obtained based on a post-fault positive-sequence voltage and a pre-fault positive-sequence reactive current, and a second current limit value is obtained based on a post-fault negative-sequence voltage and a pre-fault negative-sequence voltage. A third current limit value and a fourth current limit value are obtained based on the first current limit value and the second current limit value. A magnitude of a positive-sequence reactive current is limited by using the third current limit value, and a magnitude of a negative-sequence reactive current is limited by using the fourth current limit value.
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