Low-Voltage Ride-Through Control Method and Device for Multi-Terminal Flexible DC Transmission of Offshore Wind Power

Abstract

The present disclosure relates to a low-voltage ride-through control method and device for multi-terminal flexible DC transmission of offshore wind power. When a fault occurs in the onshore converter station, the control method of the onshore converter station is determined; and the onshore converter station is adjusted and controlled according to the control method of the onshore converter station. Thus, when a fault occurs in the onshore converter station, the surplus power is dissipated by adjusting the control method of the onshore converter station, and the operation of the wind farm is not affected in any way, and the fault is restricted within the flexible DC system.

Description

Technical Field

[0001] The present disclosure relates to the technical field of wind power generation, and particularly to a low-voltage ride-through control method and device for multi-terminal flexible DC transmission of offshore wind power. Background Art

[0002] At present, after an onshore AC fault occurs, the active power output capacity of the AC side of the onshore converter station in the flexible DC system decreases. Since the power of the offshore wind farm cannot be fully transmitted, a large amount of surplus power appears in the DC system, resulting in a rapid increase in the voltage of the sub-module of the converter station and the DC voltage between poles. Over-voltage protection can be triggered in a few milliseconds to dozens of milliseconds, causing the system to stop running. Existing control strategies include adopting energy-consuming resistor devices, reducing the power output of wind turbines, or adjusting the AC bus voltage amplitude of the offshore sending-end converter station by the fast regulation ability of the flexible DC transmission system.

[0003] In related technologies, although the energy-consuming resistor device can effectively consume the surplus power, it has high requirements for its resistance parameters, low economy, and the high investment cost of the energy-consuming resistor device is also caused by the requirement for a fast response speed; reducing the power output of wind turbines can also balance the power to a certain extent, but the response speed is too slow; using the flexible DC system to control the AC voltage has a fast response speed, but it has little effect on severe faults and is extremely likely to cause the wind turbines to trip off the grid. Summary of the Invention

[0004] To overcome the problems existing in related technologies, the present disclosure provides a low-voltage ride-through control method and device for multi-terminal flexible DC transmission of offshore wind power.

[0005] According to the first aspect of the embodiments of the present disclosure, a low-voltage ride-through control method for multi-terminal flexible DC transmission of offshore wind power is provided, including: when a fault occurs in the onshore converter station, determining the control method of the onshore converter station; and adjusting and controlling the onshore converter station according to the control method of the onshore converter station.

[0006] According to the second aspect of the embodiments of the present disclosure, a low-voltage ride-through control system for multi-terminal flexible DC transmission of offshore wind power includes: an offshore converter station, at least one onshore converter station, and an energy-consuming device; wherein, the offshore converter station is connected to the at least one onshore converter station, and the energy-consuming device is installed on the DC side of any one of the onshore converter stations.

[0007] According to the third aspect of the embodiments of the present disclosure, a low-voltage ride-through control device for multi-terminal flexible DC transmission of offshore wind power is provided, including: a determination module, configured to determine the control method of the onshore converter station when a fault occurs in the onshore converter station; and an adjustment module, configured to adjust and control the onshore converter station according to the control method of the onshore converter station.

[0008] According to a fourth aspect of the embodiments of the present disclosure, there is provided an electronic device, including: a processor; and a memory for storing processor-executable instructions; wherein the processor is configured to implement the steps of the low voltage ride-through control method for multi-terminal flexible DC transmission of offshore wind power provided in the first aspect of the present disclosure.

[0009] According to a fifth aspect of the embodiments of the present disclosure, there is provided a computer-readable storage medium, on which computer program instructions are stored, and when the program instructions are executed by a processor, the steps of the low voltage ride-through control method for multi-terminal flexible DC transmission of offshore wind power provided in the first aspect of the present disclosure are implemented.

[0010] According to a sixth aspect of the embodiments of the present disclosure, there is provided a computer program product, and when the computer program is executed by a processor of an electronic device, the electronic device can execute the steps of the low voltage ride-through control method for multi-terminal flexible DC transmission of offshore wind power provided in the first aspect of the embodiments of the present disclosure as described above.

[0011] The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects:

[0012] By determining the control method of the onshore converter station when a fault occurs in the onshore converter station; and adjusting and controlling the onshore converter station according to the control method of the onshore converter station. Thus, when a fault occurs in the onshore converter station, the surplus power is dissipated by adjusting the control method of the onshore converter station, and the operation of the wind farm is not affected at all, and the fault is limited within the flexible DC system.

[0013] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings here are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure.

[0015] Figure 1 is a flowchart of a low voltage ride-through control method for multi-terminal flexible DC transmission of offshore wind power shown according to an exemplary embodiment;

[0016] Figure 2 is a schematic structural diagram of a low voltage ride-through control system for multi-terminal flexible DC transmission of offshore wind power shown according to an exemplary embodiment;

[0017] Figure 3 is a block diagram of a low voltage ride-through control device for multi-terminal flexible DC transmission of offshore wind power shown according to an exemplary embodiment;

[0018] Figure 4Block diagram of an electronic device for implementing the method according to an exemplary embodiment of the present disclosure. Detailed implementation manners

[0019] Here, the exemplary embodiments will be described in detail, and examples thereof are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present disclosure. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0020] It should be noted that all actions of obtaining signals, information, or data in the present disclosure are carried out on the premise of complying with the corresponding data protection regulations and policies of the country where the location is located and obtaining the authorization given by the owner of the corresponding device.

[0021] Figure 1 It is a flowchart of a low-voltage ride-through control method for offshore wind power multi-terminal flexible DC transmission according to an exemplary embodiment. Here, it should be noted that the low-voltage ride-through control method for offshore wind power multi-terminal flexible DC transmission in this embodiment is executed by a low-voltage ride-through control device for offshore wind power multi-terminal flexible DC transmission. The low-voltage ride-through control device for offshore wind power multi-terminal flexible DC transmission can be implemented by software and / or hardware, and the low-voltage ride-through control device for offshore wind power multi-terminal flexible DC transmission can be configured in an electronic device. The following takes the execution subject as an electronic device for illustration.

[0022] As Figure 1 shown, the low-voltage ride-through control method for offshore wind power multi-terminal flexible DC transmission includes the following steps:

[0023] In step S101, when a fault occurs in the onshore converter station, determine the control method of the onshore converter station.

[0024] Among them, there are two control methods for the onshore converter station. The first control method is the constant DC voltage and constant reactive power control method, and the second control method is the constant active power and constant reactive power control method. The onshore converter station adopting the first control method is the first onshore converter station, and the onshore converter station adopting the second control method is the second onshore converter station.

[0025] Optionally, when it is monitored that an AC system grounding fault occurs in any onshore converter station, query the number of the onshore converter station to determine the control method of the onshore converter station.

[0026] In step S102, adjust and control the onshore converter station according to the control method of the onshore converter station.

[0027] As a possible implementation, the control method of the onshore converter station is the first control method; according to the control method of the onshore converter station, the onshore converter station is adjusted and controlled, including: determining that the onshore converter station is the first onshore converter station, where the control method of the first onshore converter station is the first control method; correcting the reactive power of the first onshore converter station.

[0028] As a possible implementation, the control method of the onshore converter station is the second control method; according to the control method of the onshore converter station, the onshore converter station is adjusted and controlled, further including: determining that the onshore converter station is the second onshore converter station, where the control method of the second onshore converter station is the second control method; converting the control method of the second onshore converter station to the first control method and correcting the reactive power of the second onshore converter station; converting the control method of the first onshore converter station in a non-fault state to the second control method and correcting the active power of the first onshore converter station.

[0029] Optionally, when it is detected that a fault occurs in the AC system of the second onshore converter station, the second onshore converter station quickly switches from the second control method control strategy to the first control method control strategy, and corrects the reactive power setting value according to the change of the AC bus voltage. The reactive power is corrected by the following formula (1): where ΔU is the AC system voltage fluctuation, ΔQ is the reactive power exchanged between the DC system and the AC system, S SCmin is the minimum short-circuit capacity of the AC system, Q Z is the corrected setting value, Q ref is the original reference value.

[0030] Optionally, the first onshore converter station switches to the second control method control strategy, and corrects the active power according to the surplus power. The active power is corrected by the following formula (2):

[0031] where P Z is the corrected setting value, P ref is the original reference value, ΔP is the surplus power, and n is the number of non-fault onshore converter stations.

[0032] In summary, when a fault occurs in the onshore converter station, the control method of the onshore converter station is determined; according to the control method of the onshore converter station, the onshore converter station is adjusted and controlled. Thus, when a fault occurs in the onshore converter station, the surplus power is dissipated by adjusting the control method of the onshore converter station, and the operation of the wind farm is not affected at all, and the fault is limited within the flexible DC system.

[0033] Figure 2 It is a schematic structural diagram of a low voltage ride-through control system for offshore wind power multi-terminal flexible DC transmission according to an exemplary embodiment.

[0034] As shown in Figure 2 FIG. 4, the low-voltage ride-through control system for multi-terminal flexible HVDC transmission of offshore wind power includes: an offshore converter station 210, at least one onshore converter station 220, and an energy-consuming device 230.

[0035] Among them, the offshore converter station 210 is connected to at least one onshore converter station 220, and the energy-consuming device 230 is installed on the DC side of any onshore converter station 220.

[0036] The onshore converter station 220 includes: a first onshore converter station 221 and a second onshore converter station 222; among them, the number of the first onshore converter stations is 1, and the number of the second onshore converter stations is at least one.

[0037] In the embodiment of the present disclosure, the offshore converter station 210 performs constant AC voltage and constant frequency control, the first onshore converter station 221 selects a constant DC voltage and constant reactive power control strategy, and the second onshore converter station 222 selects a constant active power and constant reactive power control strategy.

[0038] As a possible implementation manner, it is determined that the onshore converter station 220 where a fault occurs is the first onshore converter station 221; the control strategy of the first onshore converter station 221 remains unchanged, and the reactive power of the first onshore converter station 221 is corrected.

[0039] As a possible implementation manner, it is determined that the onshore converter station 220 where a fault occurs is the second onshore converter station 222; the control method of the second onshore converter station 222 is converted to a first control method, and the reactive power of the second onshore converter station 222 is corrected according to the change of the AC bus voltage; the control method of the first onshore converter station 221 in a non-fault state is converted to a second control method, and the active power of the first onshore converter station 221 is corrected according to the surplus power.

[0040] In summary, the low-voltage ride-through control system for multi-terminal flexible HVDC transmission of offshore wind power in the embodiment of the present disclosure includes: an offshore converter station, at least one onshore converter station, and an energy-consuming device. By coordinating the control strategy, when a fault occurs in the onshore converter station AC system, the surplus power of the fault station is dissipated. Only one energy-consuming device needs to be set, which saves costs and avoids affecting the operation of the wind farm.

[0041] Figure 3 is a block diagram of a low-voltage ride-through control device for multi-terminal flexible HVDC transmission of offshore wind power shown according to an exemplary embodiment. Refer to Figure 3 FIG. 5, the device 300 includes: a determination module 310 and an adjustment module 320.

[0042] Among them, a determination module 310 is configured to determine a control method for the onshore converter station when a fault occurs in the onshore converter station;

[0043] An adjustment module 320 is configured to perform adjustment control on the onshore converter station according to the control method of the onshore converter station.

[0044] As an implementation manner of an embodiment of the present disclosure, the adjustment module 320 is specifically configured to determine that the onshore converter station is a first onshore converter station, where the control method of the first onshore converter station is a first control method; correct the reactive power of the first onshore converter station.

[0045] As an implementation manner of an embodiment of the present disclosure, the adjustment module 320 is further configured to determine that the onshore converter station is a second onshore converter station, where the control method of the second onshore converter station is a second control method; convert the control method of the second onshore converter station into the first control method, and correct the reactive power of the second onshore converter station; convert the control method of the first onshore converter station in a non-fault state into the second control method, and correct the active power of the first onshore converter station.

[0046] As an implementation manner of an embodiment of the present disclosure, the first control method is a constant DC voltage and constant reactive power control method, and the second control method is a constant active power and constant reactive power control method.

[0047] As an implementation manner of an embodiment of the present disclosure, the reactive power is corrected by the following formula: where ΔU is the AC system voltage fluctuation, ΔQ is the reactive power exchanged between the DC system and the AC system, S SCmin is the minimum short-circuit capacity of the AC system, Q Z is the corrected setting value, and Q ref is the original reference value.

[0048] As an implementation manner of an embodiment of the present disclosure, the active power is corrected by the following formula: where P Z is the corrected setting value, P ref is the original reference value, ΔP is the surplus power, and n is the number of non-fault onshore converter stations.

[0049] Regarding the device in the above embodiment, the specific manners in which each module performs operations have been described in detail in the embodiment related to the method, and will not be elaborated here.

[0050] The low-voltage ride-through control device for multi-terminal flexible DC offshore wind power transmission according to the embodiments of the present disclosure determines the control method of the onshore converter station when a fault occurs in the onshore converter station, and adjusts and controls the onshore converter station according to the control method of the onshore converter station. Thus, when a fault occurs in the onshore converter station, the surplus power is dissipated by adjusting the control method of the onshore converter station, and the operation of the wind farm is not affected at all, and the fault is limited within the flexible DC system.

[0051] To implement the above embodiments, the present disclosure also provides an electronic device, a readable storage medium, and a computer program product.

[0052] The electronic device includes: a processor 420; a memory 410 for storing executable instructions of the processor 420; wherein, the processor 420 is configured to execute the low-voltage ride-through control method for multi-terminal flexible DC offshore wind power transmission proposed in the first aspect embodiment of the present disclosure as described above.

[0053] As an example, Figure 4 FIG. is a block diagram of an electronic device for implementing the method according to an exemplary embodiment of the present disclosure. As Figure 4 shown, the above electronic device 400 may include:

[0054] A memory 410 and a processor 420, a bus 430 connecting different components (including the memory 410 and the processor 420), and the memory 410 stores a computer program, and when the processor 420 executes the program, it implements the low-voltage ride-through control method for multi-terminal flexible DC offshore wind power transmission proposed in the first aspect embodiment of the present disclosure as described above.

[0055] The bus 430 represents one or more of several types of bus structures, including a memory bus or a memory controller, a peripheral bus, a graphics acceleration port, a processor, or a local bus using any bus structure in a variety of bus structures. For example, these architectures include, but are not limited to, Industry Standard Architecture (ISA) bus, Micro Channel Architecture (MAC) bus, Enhanced ISA bus, Video Electronics Standards Association (VESA) local bus, and Peripheral Component Interconnect (PCI) bus.

[0056] The electronic device 400 typically includes a variety of computer-readable media. These media can be any available media accessible by the electronic device 400, including volatile and non-volatile media, removable and non-removable media.

[0057] The memory 410 may also include computer system readable media in the form of volatile memory, such as random access memory (RAM) 440 and / or cache 450. The electronic device 400 may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, the storage system 460 can be used for reading and writing on non-removable, non-volatile magnetic media ( Figure 4 not shown, typically referred to as a "hard disk drive"). Although Figure 4 not shown in the figure, a disk drive for reading and writing on a removable non-volatile disk (such as a "floppy disk") and an optical disk drive for reading and writing on a removable non-volatile optical disk (such as a CD-ROM, DVD-ROM or other optical media) can be provided. In these cases, each drive can be connected to the bus 430 through one or more data media interfaces. The memory 410 may include at least one program product having a set (e.g., at least one) of program modules configured to perform the functions of the embodiments of the present disclosure.

[0058] A program / utility 480 having a set (at least one) of program modules 470 can be stored, for example, in the memory 410. Such program modules 470 include—but are not limited to—an operating system, one or more application programs, other program modules, and program data. Each or some combination of these examples may include an implementation of a network environment. The program modules 470 generally perform the functions and / or methods in the embodiments described in the present disclosure.

[0059] The electronic device 400 can also communicate with one or more external devices 490 (such as a keyboard, a pointing device, a display 491, etc.), and can also communicate with one or more devices that enable a user to interact with the electronic device 400, and / or communicate with any device that enables the electronic device 400 to communicate with one or more other computing devices (such as a network card, a modem, etc.). Such communication can be carried out through an input / output (I / O) interface 492. And, the electronic device 400 can also communicate with one or more networks (such as a local area network (LAN), a wide area network (WAN) and / or a public network, such as the Internet) through a network adapter 493. As Figure 4 shown, the network adapter 493 communicates with other modules of the electronic device 400 through the bus 430. It should be understood that although Figure 4 not shown in the figure, other hardware and / or software modules can be used in conjunction with the electronic device 400, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, etc.

[0060] The processor 420 executes various functional applications and data processing by running programs stored in the memory 410.

[0061] It should be noted that for the implementation process and technical principle of the electronic device in this embodiment, refer to the foregoing explanation of the low-voltage ride-through control method for offshore wind power multi-terminal flexible DC external power transmission in the embodiments of the present disclosure, which will not be elaborated here.

[0062] The electronic device provided in the embodiments of the present disclosure determines the control method of the onshore converter station when a fault occurs in the onshore converter station, and adjusts and controls the onshore converter station according to the control method of the onshore converter station. Thus, when a fault occurs in the onshore converter station, the surplus power is dissipated by adjusting the control method of the onshore converter station, and the operation of the wind farm is not affected at all, and the fault is limited within the flexible DC system.

[0063] To implement the above embodiments, the present disclosure also proposes a computer-readable storage medium, wherein when the instructions in the computer-readable storage medium are executed by the processor of the electronic device, the electronic device can execute the low-voltage ride-through control method for offshore wind power multi-terminal flexible DC external power transmission proposed in the first aspect embodiments of the present disclosure as described above.

[0064] To implement the above embodiments, the present disclosure also provides a computer program product, which, when executed by the processor of the electronic device, enables the electronic device to execute the low-voltage ride-through control method for offshore wind power multi-terminal flexible DC external power transmission proposed in the first aspect embodiments of the present disclosure as described above.

[0065] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0066] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present disclosure, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0067] Any process or method description represented in a flowchart or otherwise described herein can be understood to represent a module, segment, or portion of code including one or more executable instructions for implementing a customized logic function or process, and the scope of the preferred embodiments of the present disclosure includes additional implementations in which functions may be executed not in the order shown or discussed, including in a substantially simultaneous manner according to the involved functions or in a reverse order, which should be understood by those skilled in the art to which the embodiments of the present disclosure pertain.

[0068] The logic and / or steps represented in a flowchart or otherwise described herein, for example, can be considered a sequenced list of executable instructions for implementing a logical function, and can be embodied specifically in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, a system including a processor, or other systems that can fetch and execute instructions from the instruction execution system, apparatus, or device. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium include the following: an electrical connection having one or more wires (electronic device), a portable computer diskette (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium can even be paper or other suitable medium on which the program can be printed, as the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpretation, or other suitable processing as necessary, and then stored in a computer memory.

[0069] It should be understood that various parts of the present disclosure can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one of the following techniques known in the art or a combination thereof can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application specific integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

[0070] Those of ordinary skill in the art can understand that all or part of the steps carried out in implementing the above-described embodiment methods can be completed by a program instructing relevant hardware. The program can be stored in a computer-readable storage medium, and when the program is executed, it includes one or a combination of the steps of the method embodiment.

[0071] In addition, in each of the various embodiments of the present disclosure, the functional units can be integrated in a processing module, or each unit can exist physically alone, or two or more units can be integrated in a module. The above-mentioned integrated module can be implemented in the form of hardware or in the form of a software functional module. When the above-mentioned integrated module is implemented in the form of a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0072] The above-mentioned storage medium can be a read-only memory, a magnetic disk, an optical disk, etc. Although the embodiments of the present disclosure have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present disclosure.

[0073] After considering the specification and practicing the present disclosure, those skilled in the art will readily think of other implementation manners of the present disclosure. The present disclosure aims to cover any variations, uses, or adaptive changes of the present disclosure, which follow the general principles of the present disclosure and include common general knowledge or conventional technical means in the technical field not disclosed in the present disclosure. The specification and the embodiments are only regarded as exemplary, and the true scope and spirit of the present disclosure are pointed out by the following claims.

[0074] It should be understood that the present disclosure is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is only limited by the appended claims.

Claims

1. A low-voltage ride-through control method for multi-terminal flexible DC transmission of offshore wind power, characterized in that, it includes: When a fault occurs in the onshore converter station, determining the control method of the onshore converter station; Adjusting and controlling the onshore converter station according to the control method of the onshore converter station; The adjusting and controlling the onshore converter station according to the control method of the onshore converter station includes: Determining that the onshore converter station is a fault of the first onshore converter station, where the control method of the first onshore converter station is the first control method; Correcting the reactive power of the first onshore converter station; The adjusting and controlling the onshore converter station according to the control method of the onshore converter station further includes: Determining that the onshore converter station is a fault of the second onshore converter station, where the control method of the second onshore converter station is the second control method; Converting the control method of the second onshore converter station to the first control method and correcting the reactive power of the second onshore converter station; Converting the control method of the first onshore converter station in a non-fault state to the second control method and correcting the active power of the first onshore converter station; The first control method is a constant DC voltage and constant reactive power control method, and the second control method is a constant active power and constant reactive power control method; Correcting the reactive power through the following formula: Wherein, ΔU is the voltage fluctuation of the AC system, ΔQ is the reactive power exchanged between the DC system and the AC system, S SCmin is the minimum short-circuit capacity of the AC system, Q Z is the corrected setting value, Q ref is the original reference value; Correcting the active power through the following formula: Among them, P Z is the corrected setting value, P ref is the original reference value, ΔP is the surplus power, and n is the number of non-fault onshore converter stations.

2. A low-voltage ride-through control system for multi-terminal flexible DC transmission of offshore wind power, characterized in that, it includes: An offshore converter station, at least one onshore converter station and an energy-consuming device; Wherein, the offshore converter station is connected to the at least one onshore converter station, and the energy-consuming device is installed on the DC side of any one of the onshore converter stations; The onshore converter station includes: a first onshore converter station and a second onshore converter station; Wherein, the number of the first onshore converter stations is 1, and the number of the second onshore converter stations is at least one; A determination module for determining the control method of the onshore converter station when a fault occurs in the onshore converter station; An adjustment module for adjusting and controlling the onshore converter station according to the control method of the onshore converter station; The adjusting and controlling the onshore converter station according to the control method of the onshore converter station includes: Determining that the onshore converter station is a fault of the first onshore converter station, where the control method of the first onshore converter station is the first control method; Correcting the reactive power of the first onshore converter station; The adjusting and controlling the onshore converter station according to the control method of the onshore converter station further includes: Determining that the onshore converter station is a fault of the second onshore converter station, where the control method of the second onshore converter station is the second control method; Converting the control method of the second onshore converter station to the first control method and correcting the reactive power of the second onshore converter station; Converting the control method of the first onshore converter station in a non-fault state to the second control method and correcting the active power of the first onshore converter station; The first control method is a constant DC voltage and constant reactive power control method, and the second control method is a constant active power and constant reactive power control method; The reactive power is corrected by the following formula: Among them, ΔU is the AC system voltage fluctuation, ΔQ is the reactive power exchanged between the DC system and the AC system, S SCmin is the minimum short-circuit capacity of the AC system, Q Z is the corrected setting value, Q ref is the original reference value; The active power is corrected by the following formula: Among them, P Z is the corrected setting value, P ref is the original reference value, ΔP is the surplus power, and n is the number of non-fault onshore converter stations.

3. An electronic device, characterized in that, comprising: a processor; a memory for storing instructions executable by the processor; wherein, the processor is configured to implement the method according to claim 1.

Images