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公开(公告)号：US20230318440A1
公开(公告)日：2023-10-05
申请号：US18329896
申请日：2023-06-06
发明人： Xinyu YU , Kai XIN , Zhiwu XU , Yanzhong ZHANG , Junjie LI
摘要： A method and apparatus for suppressing cross current including: obtaining a common-mode current and a common-mode injection voltage of each inverter in an inverter parallel system; determining a virtual damping voltage of each inverter based on the common-mode current of each inverter and a preset common-mode damping factor, where if a direction in which a current flows out of the inverter is a positive direction, the preset common-mode damping factor is a negative value, or if a direction in which a current flows into the inverter is a positive direction, the preset common-mode damping factor is a positive value; superimposing the virtual damping voltage on the common-mode injection voltage of each inverter, to obtain a target common-mode voltage of each inverter; and controlling operation of each inverter based on the target common-mode voltage of each inverter and a differential mode voltage of each inverter.
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公开(公告)号：US20220190605A1
公开(公告)日：2022-06-16
申请号：US17689863
申请日：2022-03-08
IPC分类号： H02J3/38
摘要： This application relates to a converter in a photovoltaic power generation system and a parametric curve scanning method for a photovoltaic string. A parametric curve includes a current-voltage curve or a power-voltage curve. The scanning method includes: controlling an output voltage of the photovoltaic string to change from a first endpoint voltage of a first voltage range to a second endpoint voltage of the first voltage range according to a first preset rule, to scan a first parametric curve; controlling the output voltage of the photovoltaic string to change from a third endpoint voltage of a second voltage range to a fourth endpoint voltage of the second voltage range according to a second preset rule, to scan a second parametric curve. There is an intersection set between the first voltage range and the second voltage range. In this application, whether a scanned curve is affected by a light change may be determined based on the first parametric curve and the second parametric curve. This is convenient and fast, and no additional hardware test device is required.
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公开(公告)号：US20240097615A1
公开(公告)日：2024-03-21
申请号：US18520763
申请日：2023-11-28
发明人： Yanzhong ZHANG , Zhiwu XU , Chongyue HUANG
CPC分类号： H02S40/32 , H02J3/38 , H02S10/00 , H02J2300/24
摘要： A photovoltaic power generation system includes a single-stage inverter, an anti-backflow circuit, a photovoltaic string, and a coupling capacitor. The anti-backflow circuit is connected to one input end of the single-stage inverter, one output end of the photovoltaic string is connected to the other input end of the single-stage inverter, and the other output end of the photovoltaic string is connected to the anti-backflow circuit. The photovoltaic string includes a buck optimizer and a photovoltaic panel. The anti-backflow circuit is configured to prevent a backflow current from flowing back to the photovoltaic string. The coupling capacitor is connected in parallel to two ends of the anti-backflow circuit and is configured to transmit a signal between each buck optimizer in the photovoltaic string and the single-stage inverter, to control backflow of the backflow current when the anti-backflow circuit fails.
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公开(公告)号：US20230299579A1
公开(公告)日：2023-09-21
申请号：US18324403
申请日：2023-05-26
发明人： Zhiwu XU , Hongmiao FANG , Yanzhong ZHANG , Changshuan SUN , Tiansan LIN
CPC分类号： H02J3/00125 , H02J13/00002 , H02J13/0004 , H02J2300/24
摘要： A power supply system including three output ends of a power converter respectively connected to a first end of a positive/negative direct current bus and a first end of a neutral bus; two input ends of a first inverter respectively connected to a second end of the positive direct current bus and a second end of the neutral bus; two input ends of a second inverter respectively connected to a second end of the neutral bus and a second end of the negative direct current bus; a controller outputs an overvoltage alarm signal when at least one of the following conditions is met: a to-ground voltage of the positive/ negative direct current bus or a to-ground voltage of the neutral bus is greater than or equal to the preset threshold.
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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：US20220329075A1
公开(公告)日：2022-10-13
申请号：US17711388
申请日：2022-04-01
摘要： A photovoltaic system includes a controller and plurality of photovoltaic strings that are independently controlled. The controller enables some photovoltaic strings to be in a maximum power point tracking state, and the remaining photovoltaic strings to be in a power output limited state. The system implements maximum power point tracking detection so that the maximum power point power and the maximum power point voltage are updated in real time. Further, the working status of the power supply system can be fed back in real time, so that the photovoltaic system can predict the capacity of an energy storage apparatus or regulate charging and discharging of the energy storage apparatus. After a curtailment state ends, the photovoltaic system is relatively quickly restored to the normal working state, so that a loss of generated power is reduced.
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公开(公告)号：US20220320866A1
公开(公告)日：2022-10-06
申请号：US17707121
申请日：2022-03-29
发明人： Hualei JU , Zhiwu XU , Haibin GUO
IPC分类号： H02J3/32
摘要： A power system includes a controller, configured to adjust an output current of a first converter to a first current value based on a voltage of a direct current bus and a voltage threshold, where a difference between an adjusted voltage of the direct current bus and the voltage threshold is less than a difference between the unadjusted voltage of the direct current bus and the voltage threshold. The controller adjusts the output current of the first converter to a second current value based on output power of the first converter and a power threshold, where a difference between adjusted output power of the first converter and the power threshold is less than a difference between the unadjusted output power of the first converter and the power threshold. The controller adjusts the output current of the first converter based on the first current value and the second current value.
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公开(公告)号：US20220294361A1
公开(公告)日：2022-09-15
申请号：US17826395
申请日：2022-05-27
发明人： Zhiwu XU , Yongbing Gao , Niantao Jiang
摘要： A method and an apparatus for detecting a short circuit of an inverter, and an inverter are provided. A voltage of a common bus is increased when a plurality of boost circuits in the inverter are all in a non-working state, and after circuit parameters of input sides of all the plurality of boost circuits are detected, a boost circuit in which a diode is short-circuited in the plurality of boost circuits is further determined based on the circuit parameters of the input sides of the boost circuits. According to the method and the apparatus for detecting a short circuit of an inverter, and the inverter, circuit complexity of the inverter can be reduced, and circuit complexity of a photovoltaic power generation system including the inverter is reduced.
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