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公开(公告)号：US20240079881A1
公开(公告)日：2024-03-07
申请号：US18496045
申请日：2023-10-27
发明人： Lin LI , Zhiwu XU , Haibin GUO
CPC分类号： H02J3/381 , H02J3/32 , H02J3/466 , H02J2300/26
摘要： A power system includes N direct current coupling units, N direct current buses, and a main controller. The main controller is configured to: obtain a total network input demand power (a network input power required by the power grid); obtain first amplitude limiting values (indicate a maximum discharging power that can be supplied by each energy unit to the power grid); and determine first network input power values (a power value allocated to each energy unit and that is input to the power grid, and at least one direct current coupling unit is in a first amplitude limiting state) based on the total network input demand power and the first amplitude limiting values, and the first amplitude limiting state is that a first network input power value of direct current coupling unit is equal to a first amplitude limiting value corresponding to the direct current coupling unit.
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公开(公告)号：US20230366953A1
公开(公告)日：2023-11-16
申请号：US18356406
申请日：2023-07-21
发明人： Zhiwu XU , Haibin GUO , Lin LI
摘要： A detection method and a related apparatus. Whether a first converter and a second converter are connected to a same combiner device is determined by determining an output port voltage signal of the first converter and an output port voltage signal of the second converter, so that first information or second information is generated and notified to staff. Generally, if a first converter and a second converter in a combiner system are not connected to a same combiner device, it may be considered as that a wire connection of the first converter or the second converter is incorrect. In the detection method and the related apparatus, whether there is a wiring error in the combiner system of the converters can be quickly and accurately determined in an application scenario in which voltage information at a combiner point cannot be obtained.
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公开(公告)号：US20230087302A1
公开(公告)日：2023-03-23
申请号：US17946227
申请日：2022-09-16
摘要： A three-level converter includes a high-voltage side unit, a low-voltage side unit, a flying capacitor, a first switch to a fourth switch, and a control unit. When a voltage of the flying capacitor falls outside a safe target voltage range, the control unit may control the third switch and the fourth switch to be normally open, and control, based on the voltage of the flying capacitor and a voltage of the low-voltage side unit, each of the first switch and the second switch to be turned on or off, so that the voltage of the flying capacitor falls within the target voltage range. Alternatively, the control unit may control the first switch and the second switch to be normally open, and control, based on the voltage of the flying capacitor and a voltage of the low-voltage side unit.
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公开(公告)号：US20220255461A1
公开(公告)日：2022-08-11
申请号：US17669111
申请日：2022-02-10
发明人： Lin LI , Zhiwu XU , Haibin GUO
IPC分类号： H02M7/5387 , H02M1/00 , H02J3/38
摘要： A voltage source inverter includes a bus capacitor, a bidirectional power tube, a filter inductor, and a filter capacitor. A voltage control method includes: respectively obtaining a first feedback current and a first feedback voltage from an output end of the filter inductor and an output end of the filter capacitor; obtaining a first duty cycle and a second duty cycle based on the first feedback current, a maximum current reference value, and a minimum current reference value in a current loop; obtaining a third duty cycle based on the first feedback voltage and a voltage reference value in a voltage loop; and selecting one of the first duty cycle, the second duty cycle, and the third duty cycle, and controlling the bidirectional power tube, so that a duty cycle of the bidirectional power tube is between the first duty cycle and the second duty cycle.
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5.发明申请公开(公告)号：US20220252657A1
公开(公告)日：2022-08-11
申请号：US17667297
申请日：2022-02-08
发明人： Haibin GUO , Huan ZHAO , Zhiwu XU , Lin LI
摘要： A converter system includes a plurality of converters, a sampling circuit, and a control circuit. The plurality of converters are connected in parallel. Each converter includes a detection circuit which includes a first switch and at least two resistors. The first switch is connected in parallel with one of the at least two resistors. The control circuit control the sampling circuit to collect a first voltage and a second voltage, where the first voltage is a voltage that is between a second bus and a ground cable and that is collected by the sampling circuit when first switches in detection circuits of a first quantity are in a turn-on state, the second voltage is a voltage that is between the second bus and the ground cable and that is collected by the sampling circuit when first switches in detection circuits of a second quantity are in a turn-on state.
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公开(公告)号：US20230387693A1
公开(公告)日：2023-11-30
申请号：US18365034
申请日：2023-08-03
CPC分类号： H02J3/381 , H02S40/32 , H02J2300/24
摘要： This application provides a photovoltaic system and a power supply current control method thereof. The photovoltaic system includes a direct current bus and at least two power supply units connected in parallel to the direct current bus. The power supply current control method of a photovoltaic system includes: obtaining a current power supply state parameter of each of the at least two power supply units, determining a reference power supply current value of each power supply unit based on the current power supply state parameter of each power supply unit, and adjusting a current supply power of each power supply unit based on the reference power supply current value of each power supply unit. According to this application, appropriate load distribution between power supply units can be ensured, and applicability is high.
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公开(公告)号：US20230238896A1
公开(公告)日：2023-07-27
申请号：US18179098
申请日：2023-03-06
IPC分类号： H02M7/487 , H02M7/5387 , H02M1/12
CPC分类号： H02M7/487 , H02M7/53871 , H02M1/12 , H02J2300/24
摘要： Example three-level inverters, control methods, and systems are provided. One example three-level inverter includes a first bus capacitor, a second bus capacitor, a power conversion circuit, and a controller. The first bus capacitor is connected in the middle of the current bus and the power conversion circuit. The power conversion circuit is configured to convert a direct current into a three-phase alternating current for output. The controller is configured to determine a balance reference by using a difference between absolute values of voltages of the positive and negative direct current buses and an even harmonic current in a grid-connected current, where the balance reference is used to enable the three-level inverter to generate a current signal for balancing the voltages of the positive and negative direct current buses.
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公开(公告)号：US20230170844A1
公开(公告)日：2023-06-01
申请号：US17994632
申请日：2022-11-28
发明人： Zhiwu XU , Guilei GU , Xiaofeng YAO
摘要： A photovoltaic system includes at least one DC/DC converter and the inverter. An input terminal of the at least one DC/DC converter is configured to connect to a photovoltaic module, an output terminal is configured to connect to an input terminal of the inverter by using a direct current bus, and an output terminal of the inverter is connected to an alternating current grid. When the inverter is switched from a non-power-limited working state to a power-limited working state, the inverter adjusts a bus voltage of the inverter to rise from a first voltage to a second voltage. After running in the power-limited working state for a time interval, the inverter adjusts the bus voltage to drop from the second voltage to a third voltage, where the third voltage is less than or equal to the first voltage.
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公开(公告)号：US20230400524A1
公开(公告)日：2023-12-14
申请号：US18455920
申请日：2023-08-25
发明人： Zhiwu XU , Jialong XU , Haibin GUO
IPC分类号： G01R31/3842 , H02S50/10
CPC分类号： G01R31/3842 , H02S50/10
摘要： A power supply system and an IV curve scanning method for a power supply system. The power supply system includes at least a first inverter and a second inverter. The first inverter starts, at an IV curve scanning start time of the first inverter, to perform IV curve scanning on a string connected to the first inverter, and the second inverter starts, at an IV curve scanning start time of the second inverter, to perform IV curve scanning on a string connected to the second inverter. Their IV curve scanning start time is different. In addition, a time interval between the IV curve scanning their start time is less than a preset IV curve scanning period. In the embodiments, fluctuation of an output power of the power supply system during IV curve scanning can be reduced, thereby improving system stability of the power supply system.
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公开(公告)号：US20230378764A1
公开(公告)日：2023-11-23
申请号：US18229289
申请日：2023-08-02
发明人： Zhiwu XU , Lin LI , Guowei GUO
摘要： Embodiments of this application relate to the field of control technologies, and provide a control method and a distributed power system. The method includes: controlling an inverter to work in a current source mode, where the current source mode means that the inverter serves as a current source to convert a direct current generated by a power supply device into an alternating current and output the alternating current to the alternating current grid; and controlling the inverter to switch from the current source mode to a voltage source mode when it is detected that a voltage at a first target port jumps. In this way, an output voltage of the inverter may be controlled within a safety range, so that a local load can be protected before a cause of an abnormal voltage is detected, and comparatively, power may be continuously supplied to the local load.
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