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11. 发明公开

EP4293854A1 METHOD FOR REALIZING RAPID POWER RESPONSE, AND NEW ENERGY POWER PLANT 审中-实审
公开(公告)号：EP4293854A1
公开(公告)日：2023-12-20
申请号：EP21928471.8
申请日：2021-03-02
申请人： Huawei Digital Power Technologies Co., Ltd.
发明人： WANG, Shuchao , SHEN, Yanbai , ZHANG, Yanzhong
IPC分类号： H02J3/38 , H02J3/46
摘要： This application discloses a method for implementing a fast power response and a new energy power plant, to resolve a problem, in the conventional technology, that a dynamic reactive power compensation resource that meets a requirement of a 30-millisecond dynamic reactive power compensation response time is poor in economy and low in reliability. The method is applied to a power plant-end power control apparatus in a new energy power plant, and includes: determining a whole-plant reactive power target value and/or a whole-plant active power target value of the power plant; determining, based on the whole-plant reactive power target value and/or the whole-plant active power target value, a second power control instruction readable to each photovoltaic inverter or power conversion system in the power plant; and delivering, through a subarray controller or a subarray communication device over an Ethernet network and/or a field bus network, the second power control instruction to each photovoltaic inverter or power conversion system indicated by address identifier information carried in the second power control instruction, so that each photovoltaic inverter or power conversion system makes a fast power response based on the second power control instruction.

12. 发明公开

EP4290727A1 ENERGY STORAGE SYSTEM AND BLACK START METHOD 审中-实审
公开(公告)号：EP4290727A1
公开(公告)日：2023-12-13
申请号：EP22758768.0
申请日：2022-02-11
申请人： Huawei Digital Power Technologies Co., Ltd.
发明人： LI, Lin , WU, Zhipeng , ZHANG, Yanzhong
IPC分类号： H02J3/40 , H02M1/36
摘要： Embodiments of this application provide an energy storage system and a black start method. The energy storage system includes a black start controller, a battery module, a first converter, and a system control unit. The black start controller outputs a black start signal, the battery module generates an output voltage based on the black start signal, and the first converter supplies power to the system control unit based on the black start signal and the output voltage of the battery module, to enable the system control unit to implement black start of the energy storage system based on the black start signal. According to embodiments of this application, efficiency of obtaining the black start signal by the system control unit is improved, and a success rate of the black start is increased.

13. 发明公开

EP4246802A1 PHOTOVOLTAIC SYSTEM AND CIRCULATION SUPPRESSION METHOD 审中-实审
公开(公告)号：EP4246802A1
公开(公告)日：2023-09-20
申请号：EP20965321.1
申请日：2020-12-14
申请人： Huawei Digital Power Technologies Co., Ltd.
发明人： YU, Xinyu , XIN, Kai , ZHANG, Yanzhong , GAO, Yongbing
IPC分类号： H02S40/32
摘要： This application provides a photovoltaic system and a circulating current suppression method. The system includes a controller and at least two inverters. A direct current input terminal of each inverter is connected to a corresponding photovoltaic array. Alternating current output terminals of the at least two inverters are connected in parallel. The controller is configured to: obtain a direct current component of a common-mode output current of at least one of the at least two inverters, and adjust a direct current bus voltage of the corresponding inverter based on a magnitude of the direct current component of the common-mode output current, to suppress a circulating current between the at least two inverters. In this technical solution, a circulating current between a plurality of inverters connected in parallel can be suppressed, thereby reducing loss caused by a circulating current, and improving power supply efficiency. In addition, leakage current mis-protection and overcurrent protection caused by a circulating current can also be avoided. An excessively large circulating current may further damage a power device in an inverter. Therefore, in this embodiment of this application, a power device can be protected from impact of a circulating current.

14. 发明公开

EP4246794A1 METHOD AND DEVICE FOR CIRCULATING CURRENT SUPPRESSION IN INVERTER PARALLEL-CONNECTION SYSTEM 审中-实审
公开(公告)号：EP4246794A1
公开(公告)日：2023-09-20
申请号：EP20967704.6
申请日：2020-12-31
申请人： Huawei Digital Power Technologies Co., Ltd.
发明人： YU, Xinyu , XIN, Kai , XU, Zhiwu , ZHANG, Yanzhong , LI, Junjie
IPC分类号： H02M7/48
摘要： Embodiments of this application disclose a method and apparatus for suppressing a cross current in an inverter parallel system, and relate to the field of power supply, to suppress a cross current in an inverter parallel system and improve reliability of inverter components. A specific solution includes: 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.

15. 发明公开

EP4236089A3 POWER GENERATION SYSTEM AND COMMUNICATION APPARATUS FOR POWER GENERATION SYSTEM 审中-实审
公开(公告)号：EP4236089A3
公开(公告)日：2023-09-06
申请号：EP23160881.1
申请日：2020-04-23
申请人： Huawei Digital Power Technologies Co., Ltd.
发明人： GAO, Yongbing , ZHANG, Yanzhong , LIN, Tiansan , SHUI, Wei , WANG, Chen
IPC分类号： H04B3/54 , H04B3/04
摘要： This application relates to an inverter in a power generation system. The inverter is configured to convert a direct current that is input from a direct-current-side device into an alternating current for power supply. The inverter includes a control apparatus and a communications apparatus. The control apparatus is configured to control the inverter to convert the direct current that is input from the direct-current-side device into an alternating current for power supply. The communications apparatus is coupled to the control apparatus, and is configured to send a networking information request signal used to request networking information to the direct-current-side device in the power generation system through a direct-current power line, where a frequency of the networking information request signal is within a first frequency band; receive the networking information from the direct-current-side device; and send a control signal to the direct-current-side device, where a frequency of the control signal is within a second frequency band. The control signal is used to control an operating parameter of the direct-current-side device. The first frequency band is lower than the second frequency band. This application can effectively prevent crosstalk during networking between the inverter and the direct-current-side device. In addition, this application further relates to a communications apparatus, a direct-current-side device, and a power generation system.

16. 发明公开

EP4181392A1 PHOTOVOLTAIC TRACKING SUPPORT ROTATION SYSTEM AND CONTROLLER 审中-实审
公开(公告)号：EP4181392A1
公开(公告)日：2023-05-17
申请号：EP21850860.4
申请日：2021-05-14
申请人： Huawei Digital Power Technologies Co., Ltd.
发明人： WAN, Song , LIU, Qinwei , SUN, Wuben , ZHANG, Yanzhong , LIU, Kai
IPC分类号： H02S40/10 , H02S40/12 , G05D3/00 , G06Q10/06 , G06Q50/06 , G06K9/62
摘要： An image/video capture apparatus is provided, to capture image data of a photovoltaic panel (101) and surroundings, and a controller (502) recognizes a category corresponding to the image data, and generates different instructions to control rotation of a photovoltaic tracker (102), to remove dust or snow accumulating on the photovoltaic panel (101). This does not need continuous heating, but is simple and efficient, saves electric energy, and resolves a technical problem that a conventional snow removal method of heating has low efficiency and wastes electric energy. In addition, a corresponding controller (1200) is further provided.

17. 发明公开

EP4138251A1 POWER SUPPLY SYSTEM 审中-实审
公开(公告)号：EP4138251A1
公开(公告)日：2023-02-22
申请号：EP20931578.7
申请日：2020-04-27
申请人： Huawei Digital Power Technologies Co., Ltd.
发明人： ZHANG, Yanzhong , GAO, Yongbing , WANG, Xun , HUEMPFNER, Roland
IPC分类号： H02J3/38
摘要： Embodiments of this application provide a power system. An output terminal of a power supply or a DC-to-DC unit is cascaded to increase an output voltage, to reduce a current between the power supply or the DC-to-DC unit and a DC-to-AC unit, and resolve cost and loss problems of a cable from the power supply or the DC-to-DC unit to the DC-to-AC unit. In addition, according to the power system provided in embodiments of this application, a quantity of cables from the power supply or the DC-to-DC unit to the DC-to-AC unit may be further reduced by cascading an output terminal of the power supply or the DC-to-DC unit and cascading an input of the DC-to-AC unit, to reduce system costs. In addition, in the power system provided in embodiments of this application, the cascaded input and isolated output of the DC-to-AC unit can reduce a specification of a power conversion device. Therefore, problems of insufficient specifications and high costs of power conversion devices in the current industry are resolved. In addition, according to the power system provided in some embodiments, a problem of potential induced degradation (PID) caused by a negative voltage of a cell panel to ground during operation of the system may be further resolved.

18. 发明公开

EP4109744A2 PHOTOVOLTAIC MODULE AND PHOTOVOLTAIC SYSTEM 审中-实审
公开(公告)号：EP4109744A2
公开(公告)日：2022-12-28
申请号：EP22176325.3
申请日：2022-05-31
申请人： Huawei Digital Power Technologies Co., Ltd.
发明人： CAO, Zhen , GU, Guilei , ZHOU, Su , CHEN, Dong , SHI, Lei , ZHANG, Yanzhong
IPC分类号： H02S40/34
摘要： This application provides a photovoltaic module and a photovoltaic system. A power converter box and at least one junction box are integrated on a backplane of the photovoltaic module as a whole, and there is a cable for connecting the power converter and the junction box. In this case, relative to the conventional technology in which a junction box is independent of a power converter, in this application, a length of a cable used when the junction box and the power converter box are taken as a whole is shorter than a length of a cable used in the conventional technology. Alternatively, only the power converter box is integrated into the backplane of the photovoltaic module, and the power converter box has a connection manner such as a solder ribbon and a circuit board cable. In this case, compared with the conventional technology in which a cable is connected to an independently placed power converter, the power converter in this application only needs to establish a connection relationship by using a solder ribbon, a circuit board cable, and the like with low costs, so that production costs are low.

19. 发明公开

EP4084326A1 PHOTOVOLTAIC POWER GENERATION SYSTEM, PHOTOVOLTAIC INVERTER AND DIRECT-CURRENT COMBINER BOX 审中-实审
公开(公告)号：EP4084326A1
公开(公告)日：2022-11-02
申请号：EP20967864.8
申请日：2020-12-31
申请人： Huawei Digital Power Technologies Co., Ltd.
发明人： ZHANG, Xiufeng , ZHANG, Yanzhong
IPC分类号： H02S40/34 , H02S40/32
摘要： This application discloses a photovoltaic power generation system, a photovoltaic inverter, and a direct current combiner box, and relates to the field of photovoltaic power generation technologies. The photovoltaic power generation system includes a protection switch and a plurality of DC-DC converters. Each DC-DC converter includes a direct current bus, a DC-DC circuit, and at least one input interface. The input interface is configured to connect to a photovoltaic unit. The photovoltaic unit includes at least one photovoltaic module. The input interface is connected to the direct current bus by using the protection switch, the direct current bus is connected to an input end of the DC-DC circuit, and an output end of the DC-DC circuit is an output end of the DC-DC converter. The protection switch includes a release and a switch mechanism that are connected in series. The release is configured to: when a short-circuit fault occurs on a line in which the release is located, control the switch mechanism to be disconnected. By using the photovoltaic power generation system, the photovoltaic unit and the line can be effectively protected when a short circuit occurs on the photovoltaic unit or the line.

20. 发明公开

EP4068564A3 ENERGY STORAGE SYSTEM 有权
公开(公告)号：EP4068564A3
公开(公告)日：2022-10-19
申请号：EP22165837.0
申请日：2022-03-31
申请人： Huawei Digital Power Technologies Co., Ltd.
发明人： LI, Jianshan , ZHANG, Yanzhong , ZHOU, He , WU, Zhipeng
IPC分类号： H02J7/00 , H02J7/34
摘要： An energy storage system, is to improve operating efficiency and system reliability that exist when a component in the energy storage system is faulty, and avoid a waste of resources. The energy storage system includes a plurality of energy storage branches, at least one switch unit, and a control circuit. Each of the energy storage branches includes a first bus, a string-level converter, and a battery string that are sequentially connected in series, a plurality of balancing converters, and a shared bus. The battery string includes a plurality of battery units connected in series, and each of the battery units includes one battery pack. The battery pack is connected to an input side of one corresponding balancing converter, and output sides of the plurality of balancing converters are separately connected to the shared bus.

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