Reversed polarity overvoltage suppression method and device for transmission line of direct current sending-out system

Abstract

The invention relates to a reversed polarity overvoltage suppression device and a reversed polarity overvoltage suppression method, device and equipment of a direct current sending-out system transmission line, which are applied to an offshore wind power direct current sending-out system, and the offshore wind power direct current sending-out system comprises an offshore platform, an onshore platform and two transmission lines. The reverse polarity overvoltage suppression device is connected in parallel between two transmission lines, the reverse polarity overvoltage suppression device comprises a first suppression assembly, a current limiting element and a second suppression assembly which are sequentially connected in series, and each of the first suppression assembly and the second suppression assembly comprises a lightning protection element, a consumption element and a protection gap. When the transmission line of the offshore wind power direct current sending-out system generates reverse polarity overvoltage, the lightning protection element and the consumption element of the reverse polarity overvoltage suppression device are matched with each other to consume energy to limit the overvoltage of the transmission line, and the energy of the transmission line is discharged through the protection gap, so that the overvoltage is quickly limited; and meanwhile, an energy dissipation path is formed to protect a transmission line from being damaged.

Description

Technical Field

[0001] The present application relates to the field of offshore wind power technology, and in particular to a reverse polarity overvoltage suppression device and a reverse polarity overvoltage suppression method, device and equipment for a DC transmission system transmission line. Background Art

[0002] With the development of offshore wind power in COSCO SHIPPING, long-distance DC transmission is the most economical wind power transmission system. The structure of the offshore wind power DC transmission system is as follows: Figure 5 As shown in the figure, the offshore wind power DC transmission system uses submarine cables as transmission lines, and the current voltage level and transmission capacity of submarine cables are limited. Especially after a fault occurs between the poles of the submarine cable, the fault current and energy will cause DC locking, and the inductive energy storage and capacitive energy storage on the submarine cable will form an LC oscillation circuit, resulting in an increase in the reverse polarity overvoltage on the submarine cable. This reverse polarity overvoltage may exceed the tolerance limit of the submarine cable and become a limiting factor for the success or failure of the offshore wind power DC transmission project. Summary of the invention

[0003] The embodiments of the present application provide a reverse polarity overvoltage suppression device and a reverse polarity overvoltage suppression method, device and equipment for a DC transmission system transmission line, which are used to solve the technical problem that in the event of a fault in an existing offshore wind power DC transmission system, the submarine cable of the transmission line may be damaged due to reverse polarity overvoltage.

[0004] In order to achieve the above objectives, the present application provides the following technical solutions:

[0005] On the one hand, a reverse polarity overvoltage suppression device is provided, which is applied to an offshore wind power DC transmission system. The offshore wind power DC transmission system includes an offshore platform, an onshore platform and two transmission lines connected between the offshore platform and the onshore platform. The reverse polarity overvoltage suppression device is connected in parallel between the two transmission lines. The reverse polarity overvoltage suppression device includes a first suppression component, a current limiting element and a second suppression component connected in series in sequence. The first suppression component and the second suppression component both include a lightning protection element, a consumable element connected in series with the lightning protection element and a protective gap connected in parallel with the lightning protection element and the consumable element.

[0006] On the other hand, a method for suppressing reverse polarity overvoltage in a DC transmission system transmission line is provided, which is applied to the reverse polarity overvoltage suppression device described above. The method for suppressing reverse polarity overvoltage comprises the following steps:

[0007] Obtain electrical quantity parameters of offshore wind power DC transmission system, as well as voltage data of transmission lines, operating voltage of lightning protection elements and gap breakdown voltage;

[0008] Determining operating parameters of the reverse polarity overvoltage suppression device according to the electrical quantity parameters, wherein the operating parameters include a rated voltage of a lightning protection element, a gap length of a protection gap, and energy of a consumption element;

[0009] Controlling the reverse polarity overvoltage suppression device to operate according to the operating parameters according to the voltage data, so as to consume the energy of the transmission line, discharge the energy of the transmission line, and suppress the reverse polarity overvoltage of the transmission line;

[0010] Wherein, the gap breakdown voltage is greater than the operating voltage.

[0011] Preferably, controlling the reverse polarity overvoltage suppression device to operate according to the operating parameters according to the voltage data includes:

[0012] If the voltage data is greater than the action voltage, the lightning protection element and the consumption element of the first suppression component and the second suppression component are controlled to operate according to the corresponding operating parameters to consume the energy of the transmission line; and the reverse polarity overvoltage is suppressed by the current limiting element;

[0013] If the voltage data is greater than the gap breakdown voltage, the protection gaps of the first suppression component and the second suppression component are controlled to be broken down to discharge the energy of the transmission line; and the reverse polarity overvoltage is suppressed by the current limiting element.

[0014] Preferably, determining the operating parameters of the reverse polarity overvoltage suppression device according to the electrical quantity parameters includes:

[0015] Calculating the rated voltage of the lightning protection element according to the DC rated voltage and energy coefficient of the electrical quantity parameter;

[0016] The energy of the consumption element is obtained by calculation based on the lightning protection element coordination current, lightning protection element protection voltage, total reactance of the transmission line and total capacitance of the transmission line of the electrical quantity parameters;

[0017] The gap length of the protection gap is obtained by calculating the maximum withstand voltage of the transmission line, the gap coefficient and the standard deviation of the electrical quantity parameters.

[0018] Preferably, the gap coefficient is 1.15; and / or the energy coefficient is 0.8-0.9; and / or the standard deviation is 0.06.

[0019] On the other hand, a reverse polarity overvoltage suppression device for a DC transmission system transmission line is provided, which is applied to the reverse polarity overvoltage suppression device described above, and the reverse polarity overvoltage suppression device includes a data acquisition module, a parameter determination module and an execution module;

[0020] The data acquisition module is used to obtain electrical quantity parameters of the offshore wind power DC transmission system and voltage data of the transmission line, the operating voltage of the lightning protection element and the gap breakdown voltage;

[0021] The parameter determination module is used to determine the operating parameters of the reverse polarity overvoltage suppression device according to the electrical quantity parameters, wherein the operating parameters include the rated voltage of the lightning protection element, the gap length of the protection gap, and the energy of the consumption element;

[0022] The execution module is used to control the reverse polarity overvoltage suppression device to operate according to the operating parameters according to the voltage data, so as to consume the energy of the transmission line, discharge the energy of the transmission line, and suppress the reverse polarity overvoltage of the transmission line;

[0023] Wherein, the gap breakdown voltage is greater than the operating voltage.

[0024] Preferably, the execution module is also used to control the lightning protection elements and consumption elements of the first suppression component and the second suppression component to operate according to the corresponding operating parameters to consume the energy of the transmission line based on the voltage data being greater than the action voltage; and to suppress the reverse polarity overvoltage through the current limiting element; and to control the protection gaps of the first suppression component and the second suppression component to be broken down to discharge the energy of the transmission line based on the voltage data being greater than the gap breakdown voltage; and to suppress the reverse polarity overvoltage through the current limiting element.

[0025] Preferably, the parameter determination module includes a first calculation submodule, a second calculation submodule and a third calculation submodule;

[0026] The first calculation submodule is used to calculate the rated voltage of the lightning protection element according to the DC rated voltage and energy coefficient of the electrical quantity parameter;

[0027] The second calculation submodule is used to calculate the energy of the consumption element according to the lightning protection element coordination current, lightning protection element protection voltage, total reactance of the transmission line and total capacitance of the transmission line of the electrical quantity parameters;

[0028] The third calculation submodule is used to calculate the gap length of the protection gap according to the maximum withstand voltage of the transmission line, the gap coefficient and the standard deviation of the electrical quantity parameters.

[0029] Preferably, the gap coefficient is 1.15; and / or the energy coefficient is 0.8-0.9; and / or the standard deviation is 0.06.

[0030] In another aspect, a terminal device is provided, comprising a processor and a memory;

[0031] The memory is used to store program codes and transmit the program codes to the processor;

[0032] The processor is used to execute the above-mentioned method for suppressing reverse polarity overvoltage of the transmission line of the DC transmission system according to the instructions in the program code.

[0033] The reverse polarity overvoltage suppression device and the reverse polarity overvoltage suppression method, device and equipment for the transmission line of a DC transmission system are applied to an offshore wind power DC transmission system. The offshore wind power DC transmission system includes an offshore platform, an onshore platform and two transmission lines connected between the offshore platform and the onshore platform. The reverse polarity overvoltage suppression device is connected in parallel between the two transmission lines. The reverse polarity overvoltage suppression device includes a first suppression component, a current limiting component and a second suppression component which are connected in series in sequence. The first suppression component and the second suppression component both include a lightning protection element, a consumption element connected in series with the lightning protection element and a protection gap connected in parallel with the lightning protection element and the consumption element.

[0034] The method is applied to the above-mentioned reverse polarity overvoltage suppression device, and the reverse polarity overvoltage suppression method includes the following steps: obtaining electrical quantity parameters of the offshore wind power DC transmission system and obtaining voltage data of the transmission line, the operating voltage of the lightning protection element and the gap breakdown voltage; determining the operating parameters of the reverse polarity overvoltage suppression device according to the electrical quantity parameters, the operating parameters including the rated voltage of the lightning protection element, the gap length of the protection gap and the energy of the consumption element; controlling the reverse polarity overvoltage suppression device to work according to the operating parameters according to the voltage data, so as to consume the energy of the transmission line, discharge the energy of the transmission line and suppress the reverse polarity overvoltage of the transmission line.

[0035] It can be seen from the above technical scheme that the present application has the following advantages: when the transmission line of the offshore wind power DC transmission system generates a reverse polarity overvoltage, the lightning protection element and the consumption element of the reverse polarity overvoltage suppression device cooperate with each other to consume energy to limit the overvoltage of the transmission line and discharge the energy of the transmission line through the protection gap, thereby achieving rapid overvoltage limitation and forming an energy dissipation path to protect the transmission line from damage; the reverse polarity overvoltage is cut off by the current limiting element, further protecting the transmission line from damage; the technical problem that the submarine cable of the transmission line will be damaged by the reverse polarity overvoltage in the existing offshore wind power DC transmission system when a fault occurs is solved.

[0036] The reverse polarity overvoltage suppression method for the transmission line of the DC transmission system solves the technical problem that the submarine cable of the transmission line may be damaged by the reverse polarity overvoltage in the event of a fault in the existing offshore wind power DC transmission system.

[0037] The reverse polarity overvoltage suppression device for the transmission line of the DC transmission system can quickly limit the overvoltage of the transmission line through a data acquisition module, a parameter determination module and an execution module, and at the same time form an energy dissipation path to completely solve the reverse polarity overvoltage problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0039] Figure 1 A topological diagram of the connection between the offshore wind power DC transmission system and the reverse polarity overvoltage suppression device according to an embodiment of the present application;

[0040] Figure 2 A flowchart of the steps of the method for suppressing reverse polarity overvoltage of a transmission line of a DC transmission system according to an embodiment of the present application;

[0041] Figure 3 It is a schematic diagram of the framework of the reverse polarity overvoltage suppression device for the transmission line of the DC transmission system according to the embodiment of the present application;

[0042] Figure 4 A schematic diagram of a terminal device according to an embodiment of the present application;

[0043] Figure 5 This is the structural topology diagram of the existing offshore wind power DC transmission system. DETAILED DESCRIPTION

[0044] In order to make the purpose, features, and advantages of the invention of this application more obvious and easy to understand, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the embodiments described below are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0045] In the description of the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0046] In the embodiments of the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0047] Patent terms:

[0048] The energy of resistors mainly refers to electrical energy and thermal energy.

[0049] The embodiments of the present application provide a reverse polarity overvoltage suppression device and a reverse polarity overvoltage suppression method, device and equipment for a DC transmission system transmission line, which solves the technical problem that in the event of a fault in an existing offshore wind power DC transmission system, the submarine cable of the transmission line may be damaged due to reverse polarity overvoltage.

[0050] Embodiment 1:

[0051] Figure 1 This is a topological diagram of the connection between the offshore wind power DC transmission system and the reverse polarity overvoltage suppression device described in an embodiment of the present application.

[0052] like Figure 1 As shown, an embodiment of the present application provides a reverse polarity overvoltage suppression device, which is applied to an offshore wind power DC transmission system. The offshore wind power DC transmission system includes an offshore platform 101, an onshore platform 102, and two transmission lines 103 connected between the offshore platform 101 and the onshore platform 102. The reverse polarity overvoltage suppression device 104 is connected in parallel between the two transmission lines 103. The reverse polarity overvoltage suppression device 104 includes a first suppression component 105, a current limiting element D1, and a second suppression component 106 connected in series in sequence. The first suppression component 105 and the second suppression component 106 both include a lightning protection element, a consumable element connected in series with the lightning protection element, and a protective gap connected in parallel with the lightning protection element and the consumable element.

[0053] It should be noted that the transmission line 103 can be selected as a submarine cable. In this embodiment, the first suppression component 105 includes a lightning protection element A1 and a consumable element R1 connected in series with the lightning protection element A1, and the lightning protection element A1 and the consumable element R1 are connected in series and then connected in parallel with the protection gap G1. The second suppression component 106 includes a lightning protection element A2 and a consumable element R2 connected in series with the lightning protection element A2, and the lightning protection element A2 and the consumable element R2 are connected in series and then connected in parallel with the protection gap G2. Among them, the lightning protection element A can be a lightning arrester. The consumable element R can be a resistor.

[0054] In the embodiment of the present application, the current limiting element D1 can be a diode. The diode is connected in series between the first suppression component 105 and the second suppression component 106, the anode of the diode is connected to the second suppression component 106, and the cathode of the diode is connected to the first suppression component 105. The diode is used to limit the reverse current, that is, to allow single-phase current to pass, thereby quickly cutting off the reverse polarity overvoltage on the transmission line 103, so that the cable of the transmission line 103 can only withstand positive polarity overvoltage. Figure 1 As shown, when the current of the transmission line 103 can only flow from the consumption element R2 to the consumption element R1, the diode is turned on, and in the opposite direction, the diode is turned off and the current cannot flow from the consumption element R1 to the consumption element R2.

[0055] In the embodiment of the present application, when the voltage of the transmission line 103 gradually increases and reaches the action voltage of the lightning protection element, the lightning protection element is activated, and the consumption element is put into the loop connected between the reverse polarity overvoltage suppression device and the offshore wind power DC transmission system, so as to realize the consumption of the loop energy by the consumption element and limit the overvoltage level at the same time. The main function of the parallel protection gap is to protect the entire loop. When the overvoltage exceeds the action voltage and is greater than the gap breakdown voltage, but the loop still cannot correctly cause the lightning protection element to operate or the energy still cannot be consumed by the consumption element, the protection gap is broken down, while protecting the reverse polarity overvoltage suppression device, the energy of the transmission line 103 is discharged.

[0056] The present application provides a reverse polarity overvoltage suppression device, which is applied to an offshore wind power DC transmission system. The offshore wind power DC transmission system includes an offshore platform, an onshore platform, and two transmission lines connected between the offshore platform and the onshore platform. The reverse polarity overvoltage suppression device is connected in parallel between the two transmission lines. The reverse polarity overvoltage suppression device includes a first suppression component, a current limiting component, and a second suppression component connected in series in sequence. The first suppression component and the second suppression component both include a lightning protection component, a consumption component connected in series with the lightning protection component, and a protection gap connected in parallel with the lightning protection component and the consumption component. When the transmission line of the offshore wind power DC transmission system generates a reverse polarity overvoltage, the lightning protection component and the consumption component of the reverse polarity overvoltage suppression device cooperate with each other to consume energy to limit the overvoltage of the transmission line and discharge the energy of the transmission line through the protection gap, so as to achieve rapid overvoltage limitation and form an energy dissipation path to protect the transmission line from being damaged; the reverse polarity overvoltage is cut off by the current limiting component to further protect the transmission line from being damaged; the technical problem that the submarine cable of the transmission line will be damaged by the reverse polarity overvoltage in the existing offshore wind power DC transmission system when a fault occurs is solved.

[0057] Embodiment 2:

[0058] Figure 2 This is a flowchart of the steps of the method for suppressing reverse polarity overvoltage in the transmission line of a DC transmission system described in an embodiment of the present application.

[0059] like Figure 2 As shown, an embodiment of the present application provides a reverse polarity overvoltage suppression method for a DC transmission system transmission line, which is applied to the above-mentioned reverse polarity overvoltage suppression device. The reverse polarity overvoltage suppression method includes the following steps:

[0060] S1. Obtain the electrical quantity parameters of the offshore wind power DC transmission system and the voltage data of the transmission line, the operating voltage and the gap breakdown voltage of the lightning protection element. Among them, the gap breakdown voltage is greater than the operating voltage.

[0061] It should be noted that the gap breakdown voltage is generally 1.05 times the protection voltage of the lightning protection element, and the protection voltage of the lightning protection element is greater than the operating voltage of the lightning protection element. The content of the reverse polarity overvoltage suppression device has been described in Example 1, and the content of the reverse polarity overvoltage suppression device will not be described again in this embodiment. In step S1, the electrical quantity parameters of the offshore wind power DC transmission system and the voltage data of the transmission line, the operating voltage of the lightning protection element and the gap breakdown voltage are obtained to provide data for subsequent steps. In this embodiment, the electrical quantity parameters include DC rated voltage, energy coefficient, lightning protection element matching current, lightning protection element protection voltage, transmission line total reactance, transmission line total capacitance, transmission line maximum withstand voltage, gap coefficient and standard deviation, etc. The protection voltage and operating voltage of the lightning protection element can be set according to demand, and are not specifically limited in this embodiment.

[0062] S2. Determine the operating parameters of the reverse polarity overvoltage suppression device based on the electrical quantity parameters, the operating parameters including the rated voltage of the lightning protection element, the gap length of the protection gap and the energy of the consumption element.

[0063] It should be noted that in step S2, the operating parameters of the reverse polarity overvoltage suppression device connected in parallel on the transmission line of the offshore wind power DC transmission system are first determined according to the electrical quantity parameters obtained in step S1 to provide data for subsequent steps.

[0064] S3. Control the reverse polarity overvoltage suppression device to operate according to the operating parameters based on the voltage data, so as to consume the energy of the transmission line, discharge the energy of the transmission line, and suppress the reverse polarity overvoltage of the transmission line.

[0065] It should be noted that when a reverse polarity overvoltage is generated in the transmission line, in step S3, the reverse polarity overvoltage suppression device is controlled according to the voltage data of the transmission line obtained in step S1, so as to quickly limit the overvoltage of the transmission line and form an energy dissipation path, thereby completely solving the reverse polarity overvoltage problem.

[0066] The present application provides a reverse polarity overvoltage suppression method for a DC transmission system transmission line, which is applied to the above-mentioned reverse polarity overvoltage suppression device. The reverse polarity overvoltage suppression method includes the following steps: obtaining electrical quantity parameters of an offshore wind power DC transmission system and obtaining voltage data of a transmission line, an operating voltage of a lightning protection element, and a gap breakdown voltage; determining operating parameters of a reverse polarity overvoltage suppression device according to the electrical quantity parameters, the operating parameters including the rated voltage of a lightning protection element, the gap length of a protection gap, and the energy of a consumption element; controlling the reverse polarity overvoltage suppression device to work according to the operating parameters according to the voltage data to consume the energy of the transmission line, discharge the energy of the transmission line, and suppress the reverse polarity overvoltage of the transmission line. When a reverse polarity overvoltage is generated in the transmission line of the offshore wind power DC transmission system, the reverse polarity overvoltage suppression method for a DC transmission system operates according to the operating parameters through the reverse polarity overvoltage suppression device to achieve rapid limitation of the overvoltage of the transmission line, and at the same time forms an energy dissipation path to protect the transmission line from being damaged, thereby solving the technical problem that the existing offshore wind power DC transmission system will damage the submarine cable of the transmission line due to reverse polarity overvoltage when a fault occurs.

[0067] In one embodiment of the present application, controlling the reverse polarity overvoltage suppression device to operate according to operating parameters according to voltage data includes:

[0068] If the voltage data is greater than the action voltage, the lightning protection elements and consumption elements of the first suppression component and the second suppression component are controlled to work according to their corresponding operating parameters to consume the energy of the transmission line; and the reverse polarity overvoltage is suppressed by the current limiting element;

[0069] If the voltage data is greater than the gap breakdown voltage, the protection gaps of the first suppression component and the second suppression component are controlled to be broken down to discharge the energy of the transmission line; and the reverse polarity overvoltage is suppressed by the current limiting element.

[0070] It should be noted that the reverse polarity overvoltage suppression method of the DC transmission system transmission line compares and judges the voltage data with the operating voltage or the gap breakdown voltage, controls the operation of the first suppression component and the second suppression component to achieve rapid overvoltage limitation, and at the same time forms an energy dissipation path to protect the transmission line from damage.

[0071] In one embodiment of the present application, determining the operating parameters of the reverse polarity overvoltage suppression device according to the electrical quantity parameters includes:

[0072] The rated voltage of the lightning protection element is obtained by calculating the DC rated voltage and energy coefficient of the electrical quantity parameters;

[0073] The energy of the consumption element is calculated based on the lightning protection element coordination current, lightning protection element protection voltage, total reactance of the transmission line and total capacitance of the transmission line of the electrical quantity parameters;

[0074] The gap length of the protection gap is obtained by calculating the maximum withstand voltage of the transmission line, the gap factor and the standard deviation of the electrical quantity parameters.

[0075] It should be noted that the gap coefficient can be selected as 1.15; the energy coefficient can be selected as 0.8~0.9; and the standard deviation can be selected as 0.06.

[0076] In the embodiments of the present application, the rated voltage of the lightning protection element is calculated using the voltage formula according to the DC rated voltage and energy coefficient of the electrical quantity parameters; the energy calculation formula is calculated using the matching current of the lightning protection element, the protection voltage of the lightning protection element, the total reactance of the transmission line and the total capacitance of the transmission line according to the electrical quantity parameters to obtain the energy of the consumption element; the gap calculation formula is calculated using the maximum withstand voltage of the transmission line, the gap coefficient and the standard deviation of the electrical quantity parameters to obtain the gap length of the protection gap. The voltage formula is:

[0077]

[0078] The energy calculation formula is:

[0079]

[0080]

[0081]

[0082] The gap calculation formula is:

[0083]

[0084] Where U A1 is the rated voltage of the lightning protection element, U dcN is the DC rated voltage, is the energy coefficient, I AR U is the matching current of the lightning protection element; AR is the protection voltage of the lightning protection element, which can be obtained through the curve of the lightning protection element configuration; L0 is the total reactance of the transmission line, C0 is the total capacitance of the transmission line, T0 is the energy tolerance time, W is the energy of the consumption element, R is the resistance of the consumption element, d is the gap length of the protection gap, U max is the maximum withstand voltage of the transmission line, k is the gap coefficient, is the standard deviation. Among them, the DC rated voltage can be understood as the nominal voltage of DC, the voltage for long-term operation. The total reactance of the transmission line can be understood as the value of the sum of the reactances of the two transmission lines, and the total capacitance of the transmission line can be understood as the value of the sum of the capacitances of the two transmission lines.

[0085] Embodiment three:

[0086] Figure 3 It is a schematic diagram of the framework of the reverse polarity overvoltage suppression device for the transmission line of the DC transmission system described in an embodiment of the present application.

[0087] like Figure 3 As shown, the embodiment of the present application provides a reverse polarity overvoltage suppression device for a DC transmission system transmission line, which is applied to the above-mentioned reverse polarity overvoltage suppression device. The reverse polarity overvoltage suppression device includes a data acquisition module 10, a parameter determination module 20 and an execution module 30;

[0088] The data acquisition module 10 is used to obtain the electrical quantity parameters of the offshore wind power DC transmission system and the voltage data of the transmission line, the operating voltage of the lightning protection element and the gap breakdown voltage;

[0089] A parameter determination module 20, for determining the operating parameters of the reverse polarity overvoltage suppression device according to the electrical quantity parameters, the operating parameters including the rated voltage of the lightning protection element, the gap length of the protection gap and the energy of the consumption element;

[0090] An execution module 30, configured to control the reverse polarity overvoltage suppression device to operate according to operating parameters according to the voltage data, so as to consume energy of the transmission line, discharge energy of the transmission line, and suppress reverse polarity overvoltage of the transmission line;

[0091] Among them, the gap breakdown voltage is greater than the action voltage.

[0092] In an embodiment of the present application, the execution module 30 is also used to control the lightning protection elements and consumption elements of the first suppression component and the second suppression component to operate according to their corresponding operating parameters to consume the energy of the transmission line based on the voltage data being greater than the action voltage; and to suppress the reverse polarity overvoltage through the current limiting element; and to control the protection gaps of the first suppression component and the second suppression component to be broken down to discharge the energy of the transmission line based on the voltage data being greater than the gap breakdown voltage; and to suppress the reverse polarity overvoltage through the current limiting element.

[0093] In the embodiment of the present application, the parameter determination module 20 includes a first calculation submodule, a second calculation submodule and a third calculation submodule;

[0094] The first calculation submodule is used to calculate the rated voltage of the lightning protection element according to the DC rated voltage and energy coefficient of the electrical quantity parameter;

[0095] The second calculation submodule is used to calculate the energy of the consumption element according to the lightning protection element coordination current, lightning protection element protection voltage, total reactance of the transmission line and total capacitance of the transmission line of the electrical quantity parameters;

[0096] The third calculation submodule is used to calculate the gap length of the protection gap according to the maximum withstand voltage of the transmission line, the gap coefficient and the standard deviation of the electrical quantity parameters.

[0097] In an embodiment of the present application, the gap coefficient is 1.15; and / or the energy coefficient is 0.8-0.9; and / or the standard deviation is 0.06.

[0098] It should be noted that the content of the module in the device of Example 3 corresponds to the step content of the method in Example 2. The content of the reverse polarity overvoltage suppression method of the DC transmission system transmission line has been described in Example 2, and the module content of the reverse polarity overvoltage suppression device of the DC transmission system transmission line will not be described in detail in this embodiment. The reverse polarity overvoltage suppression device of the DC transmission system transmission line can quickly limit the overvoltage of the transmission line through the data acquisition module 10, the parameter determination module 20 and the execution module 30, and at the same time form an energy dissipation path, which completely solves the reverse polarity overvoltage problem.

[0099] Embodiment 4:

[0100] Figure 4 A schematic diagram of a terminal device described in an embodiment of the present application.

[0101] like Figure 4 As shown, an embodiment of the present application provides a terminal device, including a processor and a memory;

[0102] A memory, used for storing program codes and transmitting the program codes to a processor;

[0103] The processor is used to execute the reverse polarity overvoltage suppression method for the transmission line of the DC transmission system according to the instructions in the program code.

[0104] It should be noted that the processor is used to execute the steps in the above-mentioned embodiment of the method for suppressing reverse polarity overvoltage in the transmission line of a DC transmission system according to the instructions in the program code. Alternatively, the processor implements the functions of each module / unit in the above-mentioned system / device embodiments when executing the computer program.

[0105] Exemplarily, the computer program may be divided into one or more modules / units, one or more modules / units are stored in a memory and executed by a processor to complete the present application. One or more modules / units may be a series of computer program instruction segments capable of completing a specific function, and the instruction segments are used to describe the execution process of the computer program in a terminal device.

[0106] The terminal device may be a computing device such as a desktop computer, a notebook, a PDA, or a cloud server. The terminal device may include, but is not limited to, a processor and a memory. Those skilled in the art will appreciate that this does not constitute a limitation on the terminal device, and may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the terminal device may also include input and output devices, network access devices, buses, etc.

[0107] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (dSIC), field-programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0108] The memory may be an internal storage unit of the terminal device, such as a hard disk or memory of the terminal device. The memory may also be an external storage device of the terminal device, such as a plug-in hard disk, a smart memory card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the terminal device. Furthermore, the memory may include both an internal storage unit of the terminal device and an external storage device. The memory is used to store computer programs and other programs and data required by the terminal device. The memory may also be used to temporarily store data that has been output or is to be output.

[0109] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0110] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0111] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0112] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0113] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, etc., various media that can store program codes.

[0114] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A reverse polarity overvoltage suppression device, applied to an offshore wind power DC transmission system, the offshore wind power DC transmission system comprising an offshore platform, an onshore platform and two transmission lines connected between the offshore platform and the onshore platform, characterized in that: The reverse polarity overvoltage suppression device is connected in parallel between the two transmission lines, and includes a first suppression component, a current limiting element, and a second suppression component connected in series in sequence. The first suppression component and the second suppression component both include a lightning protection element, a consumable element connected in series with the lightning protection element, and a protective gap connected in parallel with the lightning protection element and the consumable element.

2. A method for suppressing reverse polarity overvoltage in a DC transmission system transmission line, applied to the reverse polarity overvoltage suppression device as claimed in claim 1, characterized in that: The reverse polarity overvoltage suppression method comprises the following steps: Obtain electrical quantity parameters of offshore wind power DC transmission system, as well as voltage data of transmission lines, operating voltage of lightning protection elements and gap breakdown voltage; Determining operating parameters of the reverse polarity overvoltage suppression device according to the electrical quantity parameters, wherein the operating parameters include a rated voltage of a lightning protection element, a gap length of a protection gap, and energy of a consumption element; Controlling the reverse polarity overvoltage suppression device to operate according to the operating parameters according to the voltage data, so as to consume the energy of the transmission line, discharge the energy of the transmission line, and suppress the reverse polarity overvoltage of the transmission line; Wherein, the gap breakdown voltage is greater than the operating voltage.

3. The method for suppressing reverse polarity overvoltage of a DC transmission line according to claim 2, characterized in that: Controlling the reverse polarity overvoltage suppression device to operate according to the operating parameters according to the voltage data includes: If the voltage data is greater than the action voltage, the lightning protection element and the consumption element of the first suppression component and the second suppression component are controlled to operate according to the corresponding operating parameters to consume the energy of the transmission line; and the reverse polarity overvoltage is suppressed by the current limiting element; If the voltage data is greater than the gap breakdown voltage, the protection gaps of the first suppression component and the second suppression component are controlled to be broken down to discharge the energy of the transmission line; and the reverse polarity overvoltage is suppressed by the current limiting element.

4. The method for suppressing reverse polarity overvoltage of a DC transmission line according to claim 2, characterized in that: Determining the operating parameters of the reverse polarity overvoltage suppression device according to the electrical quantity parameters includes: Calculating the rated voltage of the lightning protection element according to the DC rated voltage and energy coefficient of the electrical quantity parameter; The energy of the consumption element is obtained by calculation based on the lightning protection element coordination current, lightning protection element protection voltage, total reactance of the transmission line and total capacitance of the transmission line of the electrical quantity parameters; The gap length of the protection gap is obtained by calculating the maximum withstand voltage of the transmission line, the gap coefficient and the standard deviation of the electrical quantity parameters.

5. The method for suppressing reverse polarity overvoltage of a DC transmission line according to claim 4, characterized in that: The gap coefficient is 1.15; and / or the energy coefficient is 0.8-0.9; and / or the standard deviation is 0.

06.

6. A reverse polarity overvoltage suppression device for a DC transmission system transmission line, applied to the reverse polarity overvoltage suppression device as claimed in claim 1, characterized in that: The reverse polarity overvoltage suppression device comprises a data acquisition module, a parameter determination module and an execution module; The data acquisition module is used to obtain electrical quantity parameters of the offshore wind power DC transmission system and voltage data of the transmission line, the operating voltage of the lightning protection element and the gap breakdown voltage; The parameter determination module is used to determine the operating parameters of the reverse polarity overvoltage suppression device according to the electrical quantity parameters, wherein the operating parameters include the rated voltage of the lightning protection element, the gap length of the protection gap, and the energy of the consumption element; The execution module is used to control the reverse polarity overvoltage suppression device to operate according to the operating parameters according to the voltage data, so as to consume the energy of the transmission line, discharge the energy of the transmission line, and suppress the reverse polarity overvoltage of the transmission line; Wherein, the gap breakdown voltage is greater than the operating voltage.

7. The reverse polarity overvoltage suppression device for a DC transmission line according to claim 6, characterized in that: The execution module is also used to control the lightning protection element and the consumption element of the first suppression component and the second suppression component to operate according to their corresponding operating parameters to consume the energy of the transmission line according to the voltage data being greater than the action voltage; and suppressing reverse polarity overvoltage by a current limiting element; and controlling the protection gaps of the first suppression component and the second suppression component to be broken down according to the voltage data being greater than the gap breakdown voltage, so as to discharge the energy of the transmission line; And the reverse polarity overvoltage is suppressed by the current limiting element.

8. The reverse polarity overvoltage suppression device for a DC transmission line according to claim 6, characterized in that: The parameter determination module includes a first calculation submodule, a second calculation submodule and a third calculation submodule; The first calculation submodule is used to calculate the rated voltage of the lightning protection element according to the DC rated voltage and energy coefficient of the electrical quantity parameter; The second calculation submodule is used to calculate the energy of the consumption element according to the lightning protection element coordination current, lightning protection element protection voltage, total reactance of the transmission line and total capacitance of the transmission line of the electrical quantity parameters; The third calculation submodule is used to calculate the gap length of the protection gap according to the maximum withstand voltage of the transmission line, the gap coefficient and the standard deviation of the electrical quantity parameters.

9. The reverse polarity overvoltage suppression device for a DC transmission line according to claim 8, characterized in that: The gap coefficient is 1.15; and / or the energy coefficient is 0.8-0.9; and / or the standard deviation is 0.

06.

10. A terminal device, characterized in that: including a processor and a memory; The memory is used to store program codes and transmit the program codes to the processor; The processor is used to execute the reverse polarity overvoltage suppression method for the transmission line of the DC transmission system according to any one of claims 2 to 5 according to the instructions in the program code.

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