Method and device for determining equipment parameters of high-voltage direct-current power transmission system and storage medium

Abstract

The application provides a method and device for determining equipment parameters of a high-voltage direct-current power transmission system and a storage medium. The method comprises: obtaining a voltage fluctuation limit value used to indicate an AC filter switching state of the high-voltage direct-current power transmission system; calculating a first product between the voltage fluctuation limit value and a first coefficient set in advance to obtain a voltage fluctuation coefficient, wherein the voltage fluctuation coefficient is not greater than the voltage fluctuation limit value; determining a group capacity of a reactive power compensation device in the high-voltage direct-current power transmission system based on the voltage fluctuation coefficient; calculating a second product between the voltage fluctuation limit value and a second coefficient set in advance to obtain a tap distance of a converter transformer in the high-voltage direct-current power transmission system; and determining a trigger angle interval of a converter valve in the high-voltage direct-current power transmission system according to the tap distance and a highest gear position of the converter transformer. The application can reduce the overall margin of the high-voltage direct-current power transmission system to reduce the power transmission cost.

Description

Technical Field

[0001] This application relates to the field of power transmission technology, and in particular to a method, apparatus, storage medium and computer equipment for determining equipment parameters of a high voltage direct current transmission system. Background Technology

[0002] High-voltage direct current (HVDC) transmission systems are widely used in long-distance power transmission due to their ability to transmit large amounts of power over long distances. Determining the main circuit parameters is a crucial step in designing an HVDC system, as this determines the equipment parameters of key components such as converter valves, converter transformers, and reactive power compensation devices. In previous main circuit designs, parameters such as the short-circuit impedance of the converter transformer and the group capacity of the reactive power compensation device were typically designed separately, and the firing angle of the converter valve and the tap spacing of the converter transformer were determined based on empirical values. This resulted in each equipment parameter having a margin in the design, leading to excessive margins in the HVDC transmission system and increased transmission costs. Summary of the Invention

[0003] The purpose of this application is to address at least one of the aforementioned technical defects, particularly the technical defect of excessively high power transmission costs in the prior art.

[0004] In a first aspect, embodiments of this application provide a method for determining equipment parameters of a high-voltage direct current transmission system, the method comprising:

[0005] Obtain voltage fluctuation limits used to indicate the switching status of the AC filter in the high-voltage direct current transmission system;

[0006] Calculate the first product between the voltage fluctuation limit and a preset first coefficient to obtain a voltage fluctuation coefficient, wherein the voltage fluctuation coefficient is not greater than the voltage fluctuation limit;

[0007] The group capacity of the reactive power compensation device in the high voltage direct current transmission system is determined based on the voltage fluctuation coefficient.

[0008] Calculate the second product between the voltage fluctuation limit and the preset second coefficient to obtain the tap spacing of the converter transformer in the high voltage direct current transmission system;

[0009] The firing angle range of the converter valve in the high voltage direct current transmission system is determined based on the tap spacing and the highest tap of the converter transformer.

[0010] In one embodiment, the step of determining the group capacity of the reactive power compensation device in the high-voltage direct current transmission system based on the voltage fluctuation coefficient includes:

[0011] Determine the total number of AC filter groups that are in operation in the high-voltage direct current transmission system;

[0012] The short-circuit capacity of the AC system, the DC power of the high-voltage direct current transmission system, the first reactive power, and the second reactive power are determined respectively; the first reactive power is the reactive power of the high-voltage direct current transmission system when none of the AC filters are in operation, and the second reactive power is the reactive power of the high-voltage direct current transmission system when one of the AC filters is in operation;

[0013] The group capacity of the reactive power compensation device is determined based on the voltage fluctuation coefficient, the total number of groups, the AC system short-circuit capacity, the DC power, the first reactive power, and the second reactive power.

[0014] In one embodiment, the step of determining the group capacity of the reactive power compensation device based on the voltage fluctuation coefficient, the total number of groups, the AC system short-circuit capacity, the DC power, the first reactive power, and the second reactive power includes:

[0015] The group capacity of the reactive power compensation device is determined based on the following expression:

[0016]

[0017] In the formula, K acf Where Q is the voltage fluctuation coefficient, N is the total number of groups, and Q is the voltage fluctuation coefficient. s P represents the short-circuit capacity of the AC system. dc Q is the DC power. dc Let Q' be the first reactive power. dc Q0 represents the second reactive power, and Q0 represents the group capacity of the reactive power compensation device.

[0018] In one embodiment, the step of determining the firing angle range of the converter valve in the high-voltage direct current transmission system based on the tap changer spacing and the highest tap of the converter transformer includes:

[0019] Obtain the rated firing angle of the converter valve;

[0020] Based on the tap changer distance and the highest gear position, determine the maximum trigger angle adjustment value;

[0021] The difference between the rated trigger angle and the maximum trigger angle adjustment value is used as the lower limit of the trigger angle range, and the sum of the rated trigger angle and the maximum trigger angle adjustment value is used as the upper limit of the trigger angle range, so as to obtain the trigger angle range.

[0022] In one embodiment, the step of determining the maximum trigger angle adjustment value based on the tap changer distance and the highest gear position includes:

[0023] The initial maximum adjustment value is calculated using the following expression:

[0024]

[0025] In the formula, Δα max K is the initial maximum adjustment value. tran The tap position is the tap distance, M is the highest gear, and α is the highest gear. M The rated firing angle;

[0026] Calculate the third product between the initial maximum adjustment value and the preset third coefficient to obtain the maximum trigger angle adjustment value.

[0027] In one embodiment, the third coefficient is greater than 1.

[0028] In one embodiment, the first coefficient is less than 1.

[0029] Secondly, embodiments of this application provide a device for determining equipment parameters of a high-voltage direct current transmission system, the device comprising:

[0030] A voltage fluctuation limit acquisition module is used to acquire voltage fluctuation limits that indicate the switching status of the AC filter in the high voltage direct current transmission system.

[0031] A voltage fluctuation coefficient acquisition module is used to calculate a first product between the voltage fluctuation limit and a preset first coefficient to obtain a voltage fluctuation coefficient, wherein the voltage fluctuation coefficient is not greater than the voltage fluctuation limit.

[0032] A reactive power compensation capacity determination module is used to determine the group capacity of the reactive power compensation device in the high voltage DC transmission system based on the voltage fluctuation coefficient.

[0033] The tap spacing acquisition module is used to calculate the second product between the voltage fluctuation limit and the preset second coefficient to obtain the tap spacing of the converter transformer in the high voltage DC transmission system.

[0034] The trigger angle range acquisition module is used to determine the trigger angle range of the converter valve in the high voltage DC transmission system based on the tap changer distance and the highest tap of the converter transformer.

[0035] Thirdly, embodiments of this application provide a storage medium storing computer-readable instructions, which, when executed by one or more processors, cause the one or more processors to perform the steps of the equipment parameter determination method for the high-voltage direct current transmission system described in any of the above embodiments.

[0036] Fourthly, embodiments of this application provide a computer device, including: one or more processors, and a memory;

[0037] The memory stores computer-readable instructions, which, when executed by the one or more processors, perform the steps of the equipment parameter determination method for the high-voltage direct current transmission system described in any of the above embodiments.

[0038] In the method, apparatus, and storage medium for determining equipment parameters of a high-voltage direct current (HVDC) transmission system disclosed in this application, the computer equipment can use the product of the voltage fluctuation limit of the HVDC transmission system and a pre-set first coefficient as the voltage fluctuation coefficient, and determine the group capacity of the reactive power compensation device in the HVDC transmission system based on this voltage fluctuation coefficient. The computer equipment can also use the product of the voltage fluctuation limit and a pre-set second coefficient as the tap spacing of the converter transformer in the HVDC transmission system, and determine the firing angle range of the converter valve in the HVDC transmission system based on the calculated tap spacing and the highest tap of the converter transformer. Thus, based on the correlation between the group capacity of the reactive power compensation device, the tap spacing of the converter transformer, and the firing angle range of the converter valve, the parameters of each piece of equipment can be designed collaboratively. This reduces the overall margin of the HVDC transmission system, avoids the parameter mismatch and poor economic efficiency problems caused by determining system equipment parameters based on empirical parameters in the prior art, thereby reducing transmission costs and improving the overall economic efficiency of DC projects. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a flowchart illustrating a method for determining equipment parameters in a high-voltage direct current transmission system in one embodiment.

[0041] Figure 2 This is a flowchart illustrating the steps for determining the group capacity of the reactive power compensation device in one embodiment;

[0042] Figure 3This is a flowchart illustrating the steps for determining the firing angle range of the converter valve in one embodiment.

[0043] Figure 4 This is a schematic diagram of the equipment parameter determination device for a high-voltage direct current transmission system in one embodiment.

[0044] Figure 5 This is a schematic diagram of the structure of a computer device in one embodiment. Detailed Implementation

[0045] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0046] As mentioned in the background section, using existing parameter determination methods to define the equipment parameters of a high-voltage direct current (HVDC) system leads to excessive margins in the HVDC transmission system, increasing transmission costs. To address this issue, the inventors discovered a correlation between the firing angle range of the converter valve, the tap spacing of the converter transformer, and the group capacity of the reactive power compensation device. Therefore, this application optimizes the parameter determination method for HVDC transmission systems based on this correlation, coordinating the design of various equipment parameters. This reduces the overall margin of the HVDC transmission system, avoiding the parameter mismatch and poor economic efficiency problems caused by using empirical parameters to determine system equipment parameters in the prior art. Consequently, it reduces transmission costs and improves the overall economic efficiency of DC projects.

[0047] In one embodiment, the method for determining equipment parameters of a high-voltage direct current (HVDC) transmission system provided in this application can be applied to HVDC transmission systems. The HVDC transmission system may include AC filters, reactive power compensation devices, converter transformers, and converter valves. It is understood that the quantity, type, structure, and arrangement of the aforementioned equipment can be determined based on actual circumstances, and this application does not impose specific limitations in this regard.

[0048] In one embodiment, this application provides a method for determining equipment parameters of a high-voltage direct current (HVDC) transmission system. The following embodiments illustrate this method using a computer device as an example. It is understood that the computer device refers to a device with specific data processing functions, which may be, but is not limited to, a desktop computer, a personal laptop, a single server, or a server cluster. Figure 1 As shown, the method for determining equipment parameters provided in this application may include the following steps:

[0049] S102: Obtain voltage fluctuation limits for indicating the switching status of the AC filter in the high-voltage direct current transmission system.

[0050] The voltage fluctuation limit refers to the voltage threshold used to indicate whether the AC filter is switched on or off. When the voltage of the HVDC transmission system meets the voltage fluctuation limit, the switching state of the AC filter can be switched. For example, if the AC filter is currently in use to filter harmonics in the HVDC transmission system, and the voltage of the HVDC transmission system meets the voltage fluctuation limit, the AC filter will switch from the on state to the off state.

[0051] In one embodiment, the voltage fluctuation limit can be determined by the user from a power grid operation rules document, tender document, or design requirements document and entered into a computer device.

[0052] S104: Calculate the first product between the voltage fluctuation limit and the preset first coefficient to obtain the voltage fluctuation coefficient, wherein the voltage fluctuation coefficient is not greater than the voltage fluctuation limit.

[0053] The computer device can obtain a pre-set first coefficient, which is a positive number less than or equal to 1. The computer device can then use the result of (K × Klimit) as the voltage fluctuation coefficient K. acf Where K is the first coefficient and Klimit is the voltage fluctuation limit.

[0054] In one embodiment, to retain a certain margin, the value of K can be less than 1. In one example, K can be equal to 0.9, thus retaining a certain margin while avoiding excessive margin, further reducing the transmission cost of the high-voltage direct current transmission system.

[0055] S106: Determine the group capacity of the reactive power compensation device in the high voltage DC transmission system based on the voltage fluctuation coefficient.

[0056] Among them, the group capacity refers to the capacity of the reactive power compensation device. By setting up a reactive power compensation device with an appropriate capacity, the power factor of the high voltage direct current transmission system can be improved.

[0057] In this application, the computer equipment can determine the group capacity of the reactive power compensation device based on the voltage fluctuation coefficient obtained in the aforementioned steps. It is understood that this application can use any method to determine the group capacity of the reactive power compensation device, and no specific limitations are imposed herein, as long as the group capacity is determined based on the voltage fluctuation coefficient.

[0058] In one embodiment, such as Figure 2 As shown, S106 may include the following steps:

[0059] S202: Determine the total number of AC filter groups that are in operation in the high-voltage direct current transmission system;

[0060] S204: Determine the short-circuit capacity of the AC system, the DC power of the high-voltage direct current transmission system, the first reactive power, and the second reactive power respectively; the first reactive power is the reactive power of the high-voltage direct current transmission system when none of the AC filters are in operation, and the second reactive power is the reactive power of the high-voltage direct current transmission system when one of the AC filters is in operation;

[0061] S206: Determine the group capacity of the reactive power compensation device based on the voltage fluctuation coefficient, the total number of groups, the AC system short-circuit capacity, the DC power, the first reactive power, and the second reactive power.

[0062] The high-voltage direct current (HVDC) transmission system may include multiple sets of AC filters, each of which may be in an active or inactive state. The total number of sets refers to the number of AC filter sets in the HVDC transmission system that are in an active state. In practical use, the HVDC transmission system is connected to an AC system, and the short-circuit capacity of the AC system is the same as the AC system short-circuit capacity described in this embodiment. It can be understood that this AC system short-circuit capacity can be the short-circuit capacity of the sending-end AC system or the short-circuit capacity of the receiving-end AC system.

[0063] Specifically, the computer equipment can determine the total number of AC filter groups in the HVDC transmission system that are in operation, and separately determine the AC system short-circuit capacity, the first reactive power of the HVDC transmission system when all AC filters are disconnected, the second reactive power of the HVDC transmission system when one group of AC filters is in operation, and the DC power of the HVDC transmission system. Based on the voltage fluctuation coefficient, the total number of AC filter groups in operation, the AC system short-circuit capacity, the DC power, the first reactive power, and the second reactive power, the computer equipment can calculate the group capacity of the reactive power compensation device, thereby further reducing the overall margin of the HVDC transmission system and lowering transmission costs.

[0064] Furthermore, in S206, the computer equipment can determine the group capacity of the reactive power compensation device based on the following expression:

[0065]

[0066] In the formula, K acf Where Q is the voltage fluctuation coefficient, N is the total number of groups, and Q is the voltage fluctuation coefficient. s P represents the short-circuit capacity of the AC system. dc Q is the DC power. dc Let Q' be the first reactive power. dcQ0 represents the second reactive power and Q0 represents the group capacity of the reactive power compensation device.

[0067] S108: Calculate the second product between the voltage fluctuation limit and the pre-set second coefficient to obtain the tap spacing of the converter transformer in the high voltage direct current transmission system.

[0068] To ensure that switching the AC filter does not trigger tap changer operation on the converter transformer, the product of the voltage fluctuation limit and a pre-set second coefficient can be calculated and used as the tap spacing of the converter transformer. In one embodiment, the second coefficient can be equal to the first coefficient; in this case, the tap spacing equals the voltage fluctuation coefficient. In another embodiment, the second coefficient can be 1; in this case, the tap spacing equals the voltage fluctuation limit.

[0069] S110: Determine the firing angle range of the converter valve in the high voltage DC transmission system based on the tap spacing and the highest tap of the converter transformer.

[0070] In this embodiment, the highest tap position of the converter transformer refers to the highest positive tap position. For example, if the converter transformer has 8 negative taps and 7 positive taps, then the highest tap position refers to the 7th positive tap. In this embodiment, the computer equipment can combine the tap spacing determined in S108 and the highest tap position of the converter transformer to determine the firing angle range of the converter valve in the high-voltage direct current transmission system. Thus, based on the correlation between the tap spacing and the firing angle range, the firing angle range can be determined to reduce the overall margin of the high-voltage direct current transmission system, thereby reducing transmission costs and improving the overall economic efficiency of the DC project.

[0071] It is understood that this application may use any method to determine the firing angle range of the converter valve. This document does not impose any specific restrictions on this, as long as the firing angle range is determined based on the tap pitch and the highest tap of the converter transformer.

[0072] In one embodiment, such as Figure 3 As shown, S110 may include the following steps:

[0073] S302: Obtain the rated firing angle of the converter valve;

[0074] S304: Determine the maximum trigger angle adjustment value based on the tap changer distance and the highest gear position;

[0075] S306: The difference between the rated trigger angle and the maximum trigger angle adjustment value is used as the lower limit of the trigger angle range, and the sum of the rated trigger angle and the maximum trigger angle adjustment value is used as the upper limit of the trigger angle range, so as to obtain the trigger angle range.

[0076] The rated firing angle of the converter valve can be determined based on its economic operating range. In one example, the firing angle on the rectifier side of the converter valve can be 15°, and the firing angle on the inverter side can be 18°. The maximum firing angle adjustment value can be used to indicate the maximum range of adjustment for the rated firing angle. Based on this maximum firing angle adjustment value, the maximum acceptable range of the firing angle can be obtained, which is the firing angle range of the converter valve.

[0077] After determining the maximum firing angle adjustment value, the computer equipment can calculate the difference between the rated firing angle and the maximum firing angle adjustment value, which serves as the lower limit α of the firing angle range. min The computer equipment can also calculate the sum of the rated firing angle and the maximum firing angle adjustment value to obtain the upper limit α of the firing angle range. max After obtaining the upper and lower limits, the trigger angle range is [α]. min ,α max In this way, the firing angle range can be determined based on the correlation between the tap changer spacing, the highest tap of the converter transformer, and the firing angle range, so as to further reduce the overall margin of the high-voltage direct current transmission system, thereby reducing transmission costs and improving the overall economic efficiency of the DC project.

[0078] Furthermore, S304 may include the following steps:

[0079] Step A1: The computer device can calculate the initial maximum adjustment value using the following expression:

[0080]

[0081] In the formula, Δα max K is the initial maximum adjustment value. tran The tap position is the tap distance, M is the highest gear, and α is the highest gear. M The rated firing angle;

[0082] Step A2: Calculate the third product between the initial maximum adjustment value and the preset third coefficient to obtain the maximum trigger angle adjustment value.

[0083] Specifically, the computer device can calculate the initial maximum adjustment value using the above formula, and use the product of the initial maximum adjustment value and a preset third coefficient as the maximum trigger angle adjustment value. The specific value of the third coefficient determines the margin range of the trigger angle. In one embodiment, to retain a certain margin, the third coefficient can be greater than 1. Further, the third coefficient can be 1.1. In this case, the trigger angle range is [α...]. M -1.1△α max ,α M +1.1△α maxIn this way, a certain margin is maintained while avoiding excessive margin, thereby further reducing the transmission cost of the high-voltage direct current transmission system.

[0084] It should be noted that this paper can also use a method similar to that described in S110 to determine the arc-extinguishing angle range of the converter valve. When determining the arc-extinguishing angle range, the rated arc-extinguishing angle, the tap changer distance, and the highest tap of the converter transformer are used to determine the arc-extinguishing angle range of the converter valve. The specific implementation can refer to any of the above embodiments, and will not be repeated here.

[0085] In this application, the computer equipment can use the product of the voltage fluctuation limit of the high-voltage direct current (HVDC) transmission system and a pre-set first coefficient as the voltage fluctuation coefficient, and determine the group capacity of the reactive power compensation device in the HVDC transmission system based on this voltage fluctuation coefficient. The computer equipment can also use the product of the voltage fluctuation limit and a pre-set second coefficient as the tap spacing of the converter transformer in the HVDC transmission system, and determine the firing angle range of the converter valve in the HVDC transmission system based on the calculated tap spacing and the highest tap of the converter transformer. Thus, based on the correlation between the group capacity of the reactive power compensation device, the tap spacing of the converter transformer, and the firing angle range of the converter valve, the parameters of each device can be designed collaboratively. This reduces the overall margin of the HVDC transmission system, avoids the parameter mismatch and poor economic efficiency problems caused by determining system equipment parameters based on empirical parameters in the prior art, thereby reducing transmission costs and improving the overall economic efficiency of DC projects.

[0086] The following describes the device for determining the equipment parameters of a high-voltage direct current transmission system provided in the embodiments of this application. The device for determining the equipment parameters of a high-voltage direct current transmission system described below can be referred to in correspondence with the method for determining the equipment parameters of a high-voltage direct current transmission system described above.

[0087] In one embodiment, this application provides a device 400 for determining equipment parameters of a high-voltage direct current transmission system. For example... Figure 4 As shown, the device 400 includes a voltage fluctuation limit acquisition module 410, a voltage fluctuation coefficient acquisition module 420, a reactive power compensation capacity determination module 430, a tap changer distance acquisition module 440, and a trigger angle range acquisition module 450. Wherein:

[0088] Voltage fluctuation limit acquisition module 410 is used to acquire voltage fluctuation limits that indicate the switching status of the AC filter of the high voltage DC transmission system.

[0089] The voltage fluctuation coefficient acquisition module 420 is used to calculate the first product between the voltage fluctuation limit and the preset first coefficient to obtain the voltage fluctuation coefficient, wherein the voltage fluctuation coefficient is not greater than the voltage fluctuation limit.

[0090] The reactive power compensation capacity determination module 430 is used to determine the group capacity of the reactive power compensation device in the high voltage DC transmission system based on the voltage fluctuation coefficient.

[0091] The tap spacing acquisition module 440 is used to calculate the second product between the voltage fluctuation limit and the preset second coefficient to obtain the tap spacing of the converter transformer in the high voltage DC transmission system.

[0092] The trigger angle range acquisition module 450 is used to determine the trigger angle range of the converter valve in the high voltage DC transmission system based on the tap pitch and the highest tap of the converter transformer.

[0093] In one embodiment, the reactive power compensation capacity determination module 430 includes a total number of groups determination unit, a power determination unit, and a first calculation unit. The total number of groups determination unit is used to determine the total number of AC filters in operation in the HVDC transmission system. The power determination unit is used to determine the AC system short-circuit capacity, the DC power of the HVDC transmission system, the first reactive power, and the second reactive power; the first reactive power is the reactive power of the HVDC transmission system when none of the AC filters are in operation, and the second reactive power is the reactive power of the HVDC transmission system when one AC filter is in operation. The first calculation unit is used to determine the group capacity of the reactive power compensation device based on the voltage fluctuation coefficient, the total number of groups, the AC system short-circuit capacity, the DC power, the first reactive power, and the second reactive power.

[0094] In one embodiment, the first calculation unit is used to determine the group capacity of the reactive power compensation device based on the following expression:

[0095]

[0096] In the formula, K acf Where Q is the voltage fluctuation coefficient, N is the total number of groups, and Q is the voltage fluctuation coefficient. s P represents the short-circuit capacity of the AC system. dc Q is the DC power. dc Let Q' be the first reactive power. dc Q0 represents the second reactive power, and Q0 represents the group capacity of the reactive power compensation device.

[0097] In one embodiment, the trigger angle range acquisition module 450 includes a rated value acquisition unit, an adjustment value determination unit, and a range acquisition unit. The rated value acquisition unit acquires the rated trigger angle of the converter valve. The adjustment value determination unit determines the maximum trigger angle adjustment value based on the tap position and the highest gear position. The range acquisition unit uses the difference between the rated trigger angle and the maximum trigger angle adjustment value as the lower limit of the trigger angle range, and the sum of the rated trigger angle and the maximum trigger angle adjustment value as the upper limit of the trigger angle range, to obtain the trigger angle range.

[0098] In one embodiment, the adjustment value determination unit includes a second calculation unit and a third calculation unit. The second calculation unit is used to calculate the initial maximum adjustment value using the following expression:

[0099]

[0100] In the formula, Δα max K is the initial maximum adjustment value. tran The tap position is the tap distance, M is the highest gear, and α is the highest gear. M The rated firing angle is mentioned above.

[0101] The third calculation unit is used to calculate the third product between the initial maximum adjustment value and the preset third coefficient to obtain the maximum trigger angle adjustment value.

[0102] In one embodiment, the third coefficient is greater than 1.

[0103] In one embodiment, the first coefficient is less than 1.

[0104] In one embodiment, this application also provides a storage medium storing computer-readable instructions, which, when executed by one or more processors, cause the one or more processors to perform the steps of the equipment parameter determination method for the high-voltage direct current transmission system described in any of the above embodiments.

[0105] In one embodiment, this application also provides a computer device. The computer device stores computer-readable instructions, which, when executed by one or more processors, cause the one or more processors to perform the steps of the equipment parameter determination method for the high-voltage direct current transmission system described in any of the above embodiments.

[0106] Indicatively, Figure 5 This is a schematic diagram of the internal structure of a computer device provided in an embodiment of this application. In one example, the computer device can be a server. (Refer to...) Figure 5The computer device 900 includes a processing component 902, which further includes one or more processors, and memory resources represented by memory 901 for storing instructions executable by the processing component 902, such as application programs. The application programs stored in memory 901 may include one or more modules, each corresponding to a set of instructions. Furthermore, the processing component 902 is configured to execute instructions to perform the steps of the device parameter determination method for the high-voltage direct current transmission system described in any of the above embodiments.

[0107] The computer device 900 may also include a power supply component 903 configured to perform power management of the computer device 900, a wired or wireless network interface 904 configured to connect the computer device 900 to a network, and an input / output (I / O) interface 905. The computer device 900 may operate on an operating system stored in memory 901, such as Windows Server™, Mac OS X™, Unix™, Linux™, Free BSD™, or similar.

[0108] Those skilled in the art will understand that the internal structure of the computer device shown in this application is merely a block diagram of a portion of the structure related to the solution of this application, and does not constitute a limitation on the computer device to which the solution of this application is applied. A specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0109] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. In this document, "a," "an," "the," "the," and "its" may also include plural forms unless the context clearly indicates otherwise. "Multiple" refers to at least two, such as 2, 3, 5, or 8, etc. "And / or" includes any and all combinations of the related listed items.

[0110] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The various embodiments can be combined as needed, and the same or similar parts can be referred to each other.

[0111] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for determining equipment parameters of a high-voltage direct current transmission system, characterized in that, The method includes: Obtain voltage fluctuation limits used to indicate the switching status of the AC filter in the high-voltage direct current transmission system; Calculate the first product between the voltage fluctuation limit and a preset first coefficient to obtain a voltage fluctuation coefficient, wherein the voltage fluctuation coefficient is not greater than the voltage fluctuation limit; and the first coefficient is less than 1. The group capacity of the reactive power compensation device in the high voltage direct current transmission system is determined based on the voltage fluctuation coefficient. Calculate the second product between the voltage fluctuation limit and the preset second coefficient to obtain the tap spacing of the converter transformer in the high voltage direct current transmission system; The firing angle range of the converter valve in the high voltage direct current transmission system is determined based on the tap spacing and the highest tap of the converter transformer.

2. The method for determining equipment parameters of a high-voltage direct current transmission system according to claim 1, characterized in that, The step of determining the group capacity of the reactive power compensation device in the high-voltage direct current transmission system based on the voltage fluctuation coefficient includes: Determine the total number of AC filter groups that are in operation in the high-voltage direct current transmission system; The short-circuit capacity of the AC system, the DC power of the high-voltage direct current transmission system, the first reactive power, and the second reactive power are determined respectively; the first reactive power is the reactive power of the high-voltage direct current transmission system when none of the AC filters are in operation, and the second reactive power is the reactive power of the high-voltage direct current transmission system when one of the AC filters is in operation; The group capacity of the reactive power compensation device is determined based on the voltage fluctuation coefficient, the total number of groups, the AC system short-circuit capacity, the DC power, the first reactive power, and the second reactive power.

3. The method for determining equipment parameters of a high-voltage direct current transmission system according to claim 2, characterized in that, The step of determining the group capacity of the reactive power compensation device based on the voltage fluctuation coefficient, the total number of groups, the AC system short-circuit capacity, the DC power, the first reactive power, and the second reactive power includes: The group capacity of the reactive power compensation device is determined based on the following expression: In the formula, The voltage fluctuation coefficient is... The total number of groups, The short-circuit capacity of the AC system, The DC power, This is the first reactive power. This is the second reactive power. The group capacity of the reactive power compensation device.

4. The method for determining equipment parameters of a high-voltage direct current transmission system according to claim 1, characterized in that, The step of determining the firing angle range of the converter valve in the high-voltage direct current transmission system based on the tap changer spacing and the highest tap of the converter transformer includes: Obtain the rated firing angle of the converter valve; Based on the tap changer distance and the highest gear position, determine the maximum trigger angle adjustment value; The difference between the rated trigger angle and the maximum trigger angle adjustment value is used as the lower limit of the trigger angle range, and the sum of the rated trigger angle and the maximum trigger angle adjustment value is used as the upper limit of the trigger angle range, so as to obtain the trigger angle range.

5. The method for determining equipment parameters of a high-voltage direct current transmission system according to claim 4, characterized in that, The step of determining the maximum trigger angle adjustment value based on the tap changer distance and the highest gear position includes: The initial maximum adjustment value is calculated using the following expression: In the formula, The initial maximum adjustment value, The tap joint spacing, This refers to the highest gear. The rated firing angle; Calculate the third product between the initial maximum adjustment value and the preset third coefficient to obtain the maximum trigger angle adjustment value.

6. The method for determining equipment parameters of a high-voltage direct current transmission system according to claim 5, characterized in that, The third coefficient is greater than 1.

7. A device for determining equipment parameters of a high-voltage direct current transmission system, characterized in that, The device includes: A voltage fluctuation limit acquisition module is used to acquire voltage fluctuation limits that indicate the switching status of the AC filter in the high-voltage direct current transmission system. A voltage fluctuation coefficient acquisition module is used to calculate a first product between the voltage fluctuation limit and a preset first coefficient to obtain a voltage fluctuation coefficient, wherein the voltage fluctuation coefficient is not greater than the voltage fluctuation limit; and the first coefficient is less than 1. A reactive power compensation capacity determination module is used to determine the group capacity of the reactive power compensation device in the high voltage DC transmission system based on the voltage fluctuation coefficient. The tap spacing acquisition module is used to calculate the second product between the voltage fluctuation limit and the preset second coefficient to obtain the tap spacing of the converter transformer in the high voltage DC transmission system. The trigger angle range acquisition module is used to determine the trigger angle range of the converter valve in the high voltage DC transmission system based on the tap changer distance and the highest tap of the converter transformer.

8. A storage medium, characterized in that, The storage medium stores computer-readable instructions that, when executed by one or more processors, cause the one or more processors to perform the steps of the equipment parameter determination method for the high-voltage direct current transmission system as described in any one of claims 1 to 6.

9. A computer device, characterized in that, include: One or more processors, and memory; The memory stores computer-readable instructions, which, when executed by the one or more processors, perform the steps of the equipment parameter determination method for the high-voltage direct current transmission system as described in any one of claims 1 to 6.

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