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1.发明公开公开(公告)号：US20240063654A1
公开(公告)日：2024-02-22
申请号：US18495084
申请日：2023-10-26
发明人： Gang XIAO , Zhiqing WU , Rong WU , Lin ZHU , Shaohui ZHONG
CPC分类号： H02J7/35 , H02J3/38 , H02J2300/24 , H02J2207/20
摘要： This application describes examples of a photovoltaic energy storage system including an inverter and an energy storage device. In one example, an input end of the inverter is connected to a direct current bus. An output end of the inverter is connected to an alternating current power grid. The energy storage device is connected to the direct current bus. The inverter is configured to send high-voltage ride-through information to the energy storage device when a high-voltage ride-through occurs in the alternating current power grid. The energy storage device is configured to: when the high-voltage ride-through information is received, adjust an output voltage reference value to maintain a discharging working state if the energy storage device is in the discharging working state, or adjust a charging power reference value to maintain a charging working state if the energy storage device is in the charging working state.
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2.发明公开公开(公告)号：US20240243604A1
公开(公告)日：2024-07-18
申请号：US18413345
申请日：2024-01-16
发明人： Siwei YANG , Haibin GUO , Shaohui ZHONG , Yuandong MENG
CPC分类号： H02J7/04 , H02M1/088 , H02M3/33573 , H02M3/33584 , H02J2207/20
摘要： A power conversion circuit includes a controller, a first-level DC/DC conversion circuit, a plurality of second-level DC/DC conversion circuits, a switching module, a first capacitor, a plurality of second capacitors, and a battery. When a voltage of the battery is less than a first voltage threshold and voltages of the first capacitor and the second capacitor are less than a third voltage threshold, the controller controls the switching module to be turned off or turned on, so that the plurality of second-level DC/DC conversion circuits are connected in series; or when the voltage of the battery is greater than a second voltage threshold and voltages at two ends of the first capacitor and the second capacitor are less than the third voltage threshold, the controller controls the switching module to be turned off or turned on, so that the plurality of second-level DC/DC conversion circuits are connected in parallel.
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公开(公告)号：US20230261510A1
公开(公告)日：2023-08-17
申请号：US18308226
申请日：2023-04-27
发明人： Zhiwu XU , Guilei GU , Shaohui ZHONG
CPC分类号： H02J7/35 , H02J3/32 , H02J2300/26
摘要： This application relates to a method for controlling a busbar voltage of a photovoltaic system. The photovoltaic system includes a DC/DC converter and a DC/AC converter. The DC/DC converter, the DC/AC converter, and an energy storage battery are connected via a busbar. The DC/DC converter is connected to a photovoltaic direct current source and performs maximum power point tracking on an input power from the photovoltaic direct current source. A load connected to the DC/AC converter has a load power. The energy storage battery has a maximum charging power and a maximum discharging power. The method includes: controlling the busbar voltage to be in a plurality of different discontinuous voltage intervals based on different results of comparison between a maximum photovoltaic power and the load power, the maximum charging power, and the maximum discharging power. The plurality of different discontinuous voltage intervals correspond to different operating states of the inverter.
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公开(公告)号：US20220276296A1
公开(公告)日：2022-09-01
申请号：US17681386
申请日：2022-02-25
发明人： Gang XIAO , Zhiqing WU , Shaohui ZHONG
IPC分类号： G01R31/08 , G01R19/165
摘要： A fault detection method for a three-phase power distribution system, which includes three phase lines and a neutral line. The three phase lines intersect with the neutral line at a neutral point, the three phase lines include a first phase line, a second phase line, and a third phase line, and at least one of the three phase lines is connected to the neutral line. The method includes: obtaining a voltage between every two phase lines; obtaining a voltage between each phase line and the neutral point based on the voltage between every two phase lines; obtaining a voltage between the neutral line and the neutral point based on a voltage between each phase line and the neutral line and the voltage between each phase line and the neutral point; and detecting the voltage between the neutral line and the neutral point, whether a fault occurs in the neutral line.
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