Reactive compensation configuration method and device for offshore wind plant

Abstract

The invention provides a reactive compensation configuration method and device for an offshore wind farm, and relates to the field of reactive compensation, in an offshore wind farm system, a first submarine cable is a submarine cable located at a section from a wind turbine generator to an offshore boosting transformer, and a second submarine cable is a submarine cable located at an offshore boosting transformer to a land centralized control center. The first high-voltage reactor and the second high-voltage reactor are respectively connected in parallel to the head and tail ends of the second submarine cable, and the low-voltage reactor and the SVG are arranged in a land centralized control center in parallel; according to the method and the device, the compensation capacities corresponding to the first high-voltage reactor, the second high-voltage reactor and the low-voltage reactor SVG are respectively determined, so that the reactive compensation configuration of the offshore wind plant is realized. By installing the high-voltage reactor, the low-voltage reactor, the dynamic reactive compensation SVG and other devices, voltage fluctuation can be effectively controlled, and the stability and reliability of a power system are enhanced.

Description

Technical Field

[0001] The present application relates to the field of reactive power compensation, and in particular to a reactive power compensation configuration method and device for an offshore wind farm. Background Art

[0002] At present, the main form of offshore wind power access is to connect the offshore wind farm to the 220kV substation on the shore through AC submarine cables after boosting the voltage. Compared with overhead lines, the charging power of AC submarine cables is large, and the power frequency overvoltage problem is more prominent. As the offshore wind farm is farther from the shore, the length of the submarine cable continues to increase, resulting in a large surplus of charging power in the wind farm access system, and reactive power cannot be balanced on the spot. The power frequency overvoltage problem seriously threatens the safe operation of the equipment. The configuration of reactive power compensation for the offshore wind farm access system is an urgent problem to be solved. Summary of the invention

[0003] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0004] The first embodiment of the present application proposes a method for configuring reactive power compensation in an offshore wind farm, including: obtaining the total reactance compensation capacity corresponding to a first high-voltage reactor, a second high-voltage reactor and a low-voltage reactor in an offshore wind farm system, wherein, in the offshore wind farm system, the first submarine cable is a submarine cable located from a wind turbine to an offshore boost transformer, the second submarine cable is a submarine cable located from an offshore boost transformer to a land-based centralized control center, and the first high-voltage reactor and the second high-voltage reactor are respectively connected in parallel at both ends of the second submarine cable; obtaining the SVG compensation capacity corresponding to a dynamic reactive power compensation device SVG in the offshore wind farm system, wherein the low-voltage reactor is arranged in parallel with the SVG. At the onshore control center; according to the preset ratio, determine the total compensation capacity of the high-voltage reactors common to the first high-voltage reactor and the second high-voltage reactor, and use the difference between the total compensation capacity of the reactors and the total compensation capacity of the high-voltage reactors as the compensation capacity of the low-voltage reactor, and the preset ratio is the ratio of the compensation capacity of the high-voltage reactor to the second charging power corresponding to the second submarine cable; determine the compensation capacity interval of the first high-voltage reactor compensation capacity corresponding to the first high-voltage reactor; set the compensation capacity of the first high-voltage reactor based on the compensation capacity interval, and use the difference between the total compensation capacity of the high-voltage reactor and the compensation capacity of the first high-voltage reactor as the second high-voltage reactor compensation capacity corresponding to the second high-voltage reactor.

[0005] According to one embodiment of the present application, the total reactance compensation capacity corresponding to the first high-voltage reactor, the second high-voltage reactor and the low-voltage reactor in the offshore wind farm system is obtained, including: obtaining the first charging power and the first reactive loss corresponding to the first submarine cable; obtaining the second charging power and the second reactive loss corresponding to the second submarine cable; obtaining the transformer reactive loss corresponding to the offshore step-up transformer; and obtaining the total reactance compensation capacity according to the first charging power, the first reactive loss, the second charging power, the second reactive loss and the transformer reactive loss.

[0006] According to one embodiment of the present application, obtaining the SVG compensation capacity corresponding to the dynamic reactive power compensation device SVG in the offshore wind farm system includes: obtaining the sum of the first charging power and the second charging power; and taking the difference between the sum and the total reactance compensation capacity as the SVG compensation capacity.

[0007] According to an embodiment of the present application, the first high-voltage reactor and the second high-voltage reactor adopt a double-end compensation method; the low-voltage reactor and the SVG adopt a single-end compensation method.

[0008] According to one embodiment of the present application, determining the compensation capacity interval of the first high-voltage reactor compensation capacity corresponding to the first high-voltage reactor includes: obtaining the maximum reactive power that the second submarine cable can pass without exceeding the maximum current carrying capacity; determining the minimum compensation capacity of the first high-voltage reactor according to the second charging power, the second reactive power loss and the maximum reactive power; obtaining the total reactive power collected at the second submarine cable at the exit of the wind farm; taking the difference between the maximum reactive power and the total reactive power as the maximum compensation capacity of the first high-voltage reactor; and determining the compensation capacity interval according to the minimum compensation capacity and the maximum compensation capacity.

[0009] According to one embodiment of the present application, obtaining the maximum reactive power that can be passed by the second submarine cable without exceeding the maximum current carrying capacity includes: obtaining the apparent power corresponding to the second submarine cable; obtaining the active power transmitted by the second submarine cable; and determining the maximum reactive power based on the apparent power and the active power.

[0010] According to one embodiment of the present application, obtaining the apparent power corresponding to the second submarine cable includes: obtaining the rated voltage corresponding to the second submarine cable; obtaining the maximum current carrying capacity allowed to pass through the second submarine cable; and determining the apparent power corresponding to the second submarine cable based on the rated voltage and the maximum current carrying capacity.

[0011] The second aspect of the present application proposes a reactive power compensation configuration device for an offshore wind farm, including: a first acquisition module, used to obtain the total reactance compensation capacity corresponding to the first high-voltage reactor, the second high-voltage reactor and the low-voltage reactor in the offshore wind farm system, wherein, in the offshore wind farm system, the first submarine cable is a submarine cable located from the wind turbine set to the offshore boost transformer section, the second submarine cable is a submarine cable located from the offshore boost transformer to the land-based centralized control center, and the first high-voltage reactor and the second high-voltage reactor are respectively connected in parallel at the head and tail ends of the second submarine cable; a second acquisition module, used to obtain the SVG compensation capacity corresponding to the dynamic reactive power compensation device SVG in the offshore wind farm system, wherein the low-voltage reactor is arranged in parallel with the SVG in the land-based centralized control center. At the control center; a first determination module is used to determine the total compensation capacity of the high-voltage reactor shared by the first high-voltage reactor and the second high-voltage reactor according to a preset ratio, and use the difference between the total compensation capacity of the reactor and the total compensation capacity of the high-voltage reactor as the compensation capacity of the low-voltage reactor, and the preset ratio is the ratio of the compensation capacity of the high-voltage reactor to the second charging power corresponding to the second submarine cable; a second determination module is used to determine the compensation capacity interval of the first high-voltage reactor compensation capacity corresponding to the first high-voltage reactor; a third determination module is used to set the compensation capacity of the first high-voltage reactor based on the compensation capacity interval, and use the difference between the total compensation capacity of the high-voltage reactor and the compensation capacity of the first high-voltage reactor as the second high-voltage reactor compensation capacity corresponding to the second high-voltage reactor.

[0012] According to one embodiment of the present application, the first acquisition module is also used to: obtain the first charging power and the first reactive loss corresponding to the first submarine cable; obtain the second charging power and the second reactive loss corresponding to the second submarine cable; obtain the transformer reactive loss corresponding to the offshore boost transformer; and obtain the total reactance compensation capacity based on the first charging power, the first reactive loss, the second charging power, the second reactive loss and the transformer reactive loss.

[0013] According to one embodiment of the present application, the second acquisition module is further used to: obtain the sum of the first charging power and the second charging power; and use the difference between the sum and the total reactance compensation capacity as the SVG compensation capacity.

[0014] According to an embodiment of the present application, the first high-voltage reactor and the second high-voltage reactor adopt a double-end compensation method; the low-voltage reactor and the SVG adopt a single-end compensation method.

[0015] According to one embodiment of the present application, the second determination module is also used to: obtain the maximum reactive power that the second submarine cable can pass without exceeding the maximum current carrying capacity; determine the minimum compensation capacity of the first high-voltage reactor based on the second charging power, the second reactive power loss and the maximum reactive power; obtain the total reactive power collected at the second submarine cable at the exit of the wind farm; use the difference between the maximum reactive power and the total reactive power as the maximum compensation capacity of the first high-voltage reactor; and determine the compensation capacity interval based on the minimum compensation capacity and the maximum compensation capacity.

[0016] According to one embodiment of the present application, the second determination module is further used to: obtain the apparent power corresponding to the second submarine cable; obtain the active power transmitted by the second submarine cable; and determine the maximum reactive power based on the apparent power and the active power.

[0017] According to one embodiment of the present application, the second determination module is further used to: obtain the rated voltage corresponding to the second submarine cable; obtain the maximum current carrying capacity allowed to pass through the second submarine cable; and determine the apparent power corresponding to the second submarine cable based on the rated voltage and the maximum current carrying capacity.

[0018] The third aspect embodiment of the present application proposes an electronic device, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to implement the reactive power compensation configuration method for an offshore wind farm as described in the first aspect embodiment of the present application.

[0019] The fourth aspect embodiment of the present application proposes a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to implement the reactive power compensation configuration method for an offshore wind farm as described in the first aspect embodiment of the present application.

[0020] The fifth aspect of the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the reactive power compensation configuration method for an offshore wind farm as described in the first aspect of the present application.

[0021] The present application achieves at least the following beneficial effects: By installing high-voltage reactors, low-voltage reactors, dynamic reactive power compensation SVG and other equipment, the present application can eliminate or reduce reactive power in the load, thereby significantly improving the power factor of the power system. Reactive power problems in power systems often cause voltage fluctuations, which in turn affect the stability and reliability of the power system. By installing high-voltage reactors, low-voltage reactors, dynamic reactive power compensation SVG and other equipment, voltage fluctuations can be effectively controlled and the stability and reliability of the power system can be enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0023] Figure 1 It is a schematic diagram of an exemplary implementation of a reactive power compensation configuration method for an offshore wind farm shown in the present application.

[0024] Figure 2 It is a schematic diagram of an offshore wind farm system shown in this application.

[0025] Figure 3 It is a schematic diagram of a reactive power compensation configuration device for an offshore wind farm shown in the present application.

[0026] Figure 4 It is a schematic diagram of an electronic device shown in one embodiment of the present application. DETAILED DESCRIPTION

[0027] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0028] Figure 1 is a schematic diagram of an exemplary implementation of a reactive power compensation configuration method for an offshore wind farm shown in the present application, such as Figure 1 As shown, the reactive power compensation configuration method of the offshore wind farm includes the following steps:

[0029] S101, obtaining a total reactance compensation capacity corresponding to a first high-voltage reactor, a second high-voltage reactor and a low-voltage reactor in an offshore wind farm system.

[0030] Figure 2 is a schematic diagram of an offshore wind farm system shown in this application, such as Figure 2 As shown, in the offshore wind farm system, the first submarine cable (such as Figure 2 As shown, in this application, it is set to be a 35kV submarine cable) is located between the wind turbine and the offshore boost transformer (such as Figure 2 As shown, in this application, the submarine cable of the 220kV step-up transformer) section is set, and the second submarine cable (such as Figure 2 As shown, the 220kV submarine cable in this application is a submarine cable located from the offshore boost transformer to the land centralized control center, and the first high-voltage reactor and the second high-voltage reactor are connected in parallel at the head and tail ends of the second submarine cable. The first high-voltage reactor and the second high-voltage reactor adopt a double-end compensation method; the low-voltage reactor and the dynamic reactive power compensation device (Static Var Generator, SVG) adopt a single-end compensation method.

[0031] In the present application, the charging power corresponding to the first submarine cable is taken as the first charging power, the reactive loss corresponding to the first submarine cable is taken as the first reactive loss, the charging power corresponding to the second submarine cable is taken as the second charging power, the reactive loss corresponding to the second submarine cable is taken as the second reactive loss, and the reactive loss corresponding to the offshore boost transformer is taken as the transformer reactive loss.

[0032] When obtaining the total reactance compensation capacity corresponding to the first high-voltage reactor, the second high-voltage reactor and the low-voltage reactor in the offshore wind farm system, first obtain the first charging power Q corresponding to the first submarine cable. C35 The first reactive loss Q L35 ; Obtain the second charging power Q corresponding to the second submarine cable C220 The second reactive power loss Q L220 ; Get the transformer reactive loss Q corresponding to the offshore boost transformer L变 ; According to the first charging power Q C35 , the first reactive power loss Q L35 , the second charging power Q C220 , the second reactive power loss Q L220 and transformer reactive loss Q L变 The calculation formula for obtaining the total reactance compensation capacity is:

[0033]

[0034] In the above formula, Q 补 Represents the total compensation capacity of the first high-voltage reactor, the second high-voltage reactor and the low-voltage reactor, Q C35 Represents the first charging power, Q C220 Represents the second charging power, Q L35 Represents the first reactive loss, Q L220 Represents the second reactive loss, Q L变 Represents the transformer reactive loss.

[0035] When calculating the first reactive power loss, the second reactive power loss and the reactive power loss of the transformer, the corresponding general calculation formula is:

[0036]

[0037] In the above formula, Q L Represents reactive power loss, I * is the current per unit value of the submarine cable line or transformer; X is the reactance of the submarine cable line or the leakage reactance of the transformer, S B The base capacity.

[0038] When calculating the first charging power and the second charging power, the corresponding general calculation formula is:

[0039]

[0040] In the above formula, Q C Represents the charging power, U * is the per unit value of the submarine cable line voltage, B is the submarine cable line susceptance, S B The base capacity.

[0041] S102, obtaining the SVG compensation capacity corresponding to the dynamic reactive power compensation device SVG in the offshore wind farm system.

[0042] Among them, the low-voltage reactor is connected in parallel with the SVG at the onshore centralized control center.

[0043] When obtaining the SVG compensation capacity corresponding to the dynamic reactive power compensation device SVG in the offshore wind farm system, first obtain the first charging power Q C35 With the second charging power Q C220 The sum of the reactance compensation capacity Q 补 The difference is used as the SVG compensation capacity, and the corresponding calculation formula is:

[0044] Q SVG =(Q C35 +Q C220 )-Q 补

[0045] In the above formula, Q SVG Indicates the SVG compensation capacity, Q C35 Represents the first charging power, Q C220 Represents the second charging power, Q 补 Represents the total reactance compensation capacity corresponding to the first high-voltage reactor, the second high-voltage reactor and the low-voltage reactor.

[0046] S103, determining the total compensation capacity of the high-voltage reactors shared by the first high-voltage reactor and the second high-voltage reactor according to a preset ratio, and taking the difference between the total compensation capacity of the reactors and the total compensation capacity of the high-voltage reactors as the compensation capacity of the low-voltage reactor.

[0047] The ratio of the total compensation capacity of the high-voltage reactors shared by the first high-voltage reactor and the second high-voltage reactor to the second charging power corresponding to the second submarine cable is preset. Generally, the ratio of the total compensation capacity of the high-voltage reactor to the second charging power corresponding to the second submarine cable is set to 60% to 80%, and the remaining compensation capacity is compensated by the low-voltage reactor.

[0048] According to the preset ratio, the calculation formula for determining the total compensation capacity of the high-voltage reactor shared by the first high-voltage reactor and the second high-voltage reactor is:

[0049] Q高 =Q C220 (60%~80%)

[0050] In the above formula, Q 高 Represents the total compensation capacity of the first high-voltage reactor and the second high-voltage reactor, Q C220 Represents the second charging power.

[0051] The calculation formula for the low-voltage reactor compensation capacity corresponding to the low-voltage reactor is:

[0052] Q 低 =Q 补 -Q 高

[0053] In the above formula, Q 低 Represents the compensation capacity of the low-voltage reactor, Q 高 Represents the total compensation capacity of the first high-voltage reactor and the second high-voltage reactor, Q 补 Represents the total reactance compensation capacity corresponding to the first high-voltage reactor, the second high-voltage reactor and the low-voltage reactor.

[0054] S104, determining a compensation capacity interval of the first high-voltage reactor compensation capacity corresponding to the first high-voltage reactor.

[0055] Based on the above steps, the low-voltage reactor compensation capacity corresponding to the low-voltage reactor and the SVG compensation capacity corresponding to the SVG have been determined. Next, the first high-voltage reactor compensation capacity corresponding to the first high-voltage reactor and the second high-voltage reactor compensation capacity corresponding to the second high-voltage reactor are obtained.

[0056] When determining the compensation capacity interval of the first high-voltage reactor compensation capacity corresponding to the first high-voltage reactor, first obtain the rated voltage U corresponding to the second submarine cable; obtain the maximum current carrying capacity I allowed to pass through the second submarine cable; and determine the apparent power S corresponding to the second submarine cable according to the rated voltage U and the maximum current carrying capacity I. Among them, the calculation formula for determining the apparent power S corresponding to the second submarine cable according to the rated voltage U and the maximum current carrying capacity I is:

[0057]

[0058] In the above formula, S is the apparent power corresponding to the second submarine cable, U is the rated voltage corresponding to the second submarine cable, and I is the maximum current carrying capacity allowed to pass through the second submarine cable.

[0059] After the apparent power corresponding to the second submarine cable is determined as above, the active power P transmitted by the second submarine cable is obtained, and the maximum reactive power Q that can be passed by the second submarine cable without exceeding the maximum current carrying capacity is obtained based on the apparent power S and the active power P. The calculation formula for obtaining the maximum reactive power Q that can be passed by the second submarine cable without exceeding the maximum current carrying capacity based on the apparent power S and the active power P is:

[0060]

[0061] In the above formula, Q represents the maximum reactive power that the second submarine cable can pass without exceeding the maximum current carrying capacity, S is the apparent power corresponding to the second submarine cable, and P represents the active power transmitted by the second submarine cable.

[0062] When the reactive power of the wind farm reaches self-balance, the second submarine cable (such as Figure 2 As shown, in this application, the charging power and reactive power loss of the 220kV submarine cable and the current carrying capacity of the submarine cable line are set. In this application, after determining the maximum reactive power that the second submarine cable can pass without exceeding the maximum current carrying capacity, the minimum compensation capacity of the first high-voltage reactor is determined according to the second charging power, the second reactive power loss and the maximum reactive power. The calculation formula for the minimum compensation capacity of the first high-voltage reactor is:

[0063] Q 高min =Q C220 -Q L220 -Q

[0064] In the above formula, Q 高mim Represents the minimum compensation capacity of the first high-voltage reactor, Q C220 Represents the second charging power, Q L220 represents the second reactive loss, and Q represents the maximum reactive power that the second submarine cable can pass without exceeding the maximum current carrying capacity.

[0065] Furthermore, the total reactive power Q collected from the wind farm outlet to the second submarine cable is obtained. 场 , and the maximum reactive power Q and the total reactive power Q 场 The difference between the first high-voltage reactor and the maximum compensation capacity Q 高max , that is, the calculation formula for the maximum compensation capacity of the first high-voltage reactor is:

[0066] Q 高max =QQ 场

[0067] In the above formula, Q 高max represents the maximum compensation capacity of the first high-voltage reactor, Q represents the maximum reactive power that the second submarine cable can pass without exceeding the maximum current carrying capacity, Q 场Represents the total reactive power collected from the wind farm outlet to the second submarine cable.

[0068] Further, according to the minimum compensation capacity and maximum compensation capacity of the first high-voltage reactor determined above, the compensation capacity interval of the first high-voltage reactor is determined as [Q 高min , Q 高max ].

[0069] S105, setting the compensation capacity of the first high-voltage reactor based on the compensation capacity interval, and taking the difference between the total compensation capacity of the high-voltage reactor and the compensation capacity of the first high-voltage reactor as the second high-voltage reactor compensation capacity corresponding to the second high-voltage reactor.

[0070] Within the range of the compensation capacity interval, the compensation capacity of the first high-voltage reactor is set according to actual conditions, and the difference between the total compensation capacity of the first high-voltage reactor and the second high-voltage reactor and the compensation capacity of the first high-voltage reactor is used as the second high-voltage reactor compensation capacity corresponding to the second high-voltage reactor.

[0071] Based on this, the low voltage reactor compensation capacity corresponding to the low voltage reactor, the SVG compensation capacity corresponding to the SVG, the first high voltage reactor compensation capacity corresponding to the first high voltage reactor and the second high voltage reactor compensation capacity corresponding to the second high voltage reactor have all been determined.

[0072] This application can eliminate or reduce the reactive power in the load by installing high-voltage reactors, low-voltage reactors, dynamic reactive power compensation SVG and other equipment, thereby significantly improving the power factor of the power system. Reactive power problems in power systems often cause voltage fluctuations, which in turn affect the stability and reliability of the power system. By installing high-voltage reactors, low-voltage reactors, dynamic reactive power compensation SVG and other equipment, voltage fluctuations can be effectively controlled and the stability and reliability of the power system can be enhanced.

[0073] Figure 3 Schematic diagram of a reactive power compensation configuration device for an offshore wind farm shown in the present application. Figure 3 As shown, the reactive power compensation configuration device 300 for an offshore wind farm includes a first acquisition module 301, a second acquisition module 302, a first determination module 303, a second determination module 304 and a third determination module 305, wherein:

[0074] The first acquisition module 301 is used to obtain the total reactance compensation capacity corresponding to the first high-voltage reactor, the second high-voltage reactor and the low-voltage reactor in the offshore wind farm system, wherein, in the offshore wind farm system, the first submarine cable is a submarine cable located from the wind turbine to the offshore boost transformer section, the second submarine cable is a submarine cable located from the offshore boost transformer to the land control center, and the first high-voltage reactor and the second high-voltage reactor are respectively connected in parallel at both ends of the second submarine cable.

[0075] The second acquisition module 302 is used to acquire the SVG compensation capacity corresponding to the dynamic reactive power compensation device SVG in the offshore wind farm system, wherein the low voltage reactor is connected in parallel with the SVG at the onshore centralized control center.

[0076] The first determination module 303 is used to determine the total compensation capacity of the high-voltage reactors shared by the first high-voltage reactor and the second high-voltage reactor according to a preset ratio, and use the difference between the total compensation capacity of the reactors and the total compensation capacity of the high-voltage reactors as the compensation capacity of the low-voltage reactor. The preset ratio is the ratio of the high-voltage reactor compensation capacity to the second charging power corresponding to the second submarine cable.

[0077] The second determination module 304 is used to determine a compensation capacity interval of the first high-voltage reactor compensation capacity corresponding to the first high-voltage reactor.

[0078] The third determination module 305 is used to set the compensation capacity of the first high-voltage reactor based on the compensation capacity interval, and use the difference between the total compensation capacity of the high-voltage reactor and the compensation capacity of the first high-voltage reactor as the second high-voltage reactor compensation capacity corresponding to the second high-voltage reactor.

[0079] Furthermore, the first acquisition module 301 is also used to: obtain a first charging power and a first reactive loss corresponding to the first submarine cable; obtain a second charging power and a second reactive loss corresponding to the second submarine cable; obtain a transformer reactive loss corresponding to the offshore boost transformer; and obtain a total reactance compensation capacity based on the first charging power, the first reactive loss, the second charging power, the second reactive loss and the transformer reactive loss.

[0080] Furthermore, the second acquisition module 302 is further used to: acquire the sum of the first charging power and the second charging power; and use the difference between the sum and the total reactance compensation capacity as the SVG compensation capacity.

[0081] Furthermore, the first high-voltage reactor and the second high-voltage reactor adopt a double-end compensation method; the low-voltage reactor and the SVG adopt a single-end compensation method.

[0082] Furthermore, the second determination module 304 is also used to: obtain the maximum reactive power that the second submarine cable can pass without exceeding the maximum current carrying capacity; determine the minimum compensation capacity of the first high-voltage reactor according to the second charging power, the second reactive power loss and the maximum reactive power; obtain the total reactive power collected at the second submarine cable at the exit of the wind farm; use the difference between the maximum reactive power and the total reactive power as the maximum compensation capacity of the first high-voltage reactor; and determine the compensation capacity interval according to the minimum compensation capacity and the maximum compensation capacity.

[0083] Furthermore, the second determination module 304 is further used to: obtain the apparent power corresponding to the second submarine cable; obtain the active power transmitted by the second submarine cable; and determine the maximum reactive power according to the apparent power and the active power.

[0084] Furthermore, the second determination module 304 is further used to: obtain the rated voltage corresponding to the second submarine cable; obtain the maximum current carrying capacity allowed to pass through the second submarine cable; and determine the apparent power corresponding to the second submarine cable according to the rated voltage and the maximum current carrying capacity.

[0085] In order to implement the above embodiment, the present application embodiment also proposes an electronic device 400, such as Figure 4 As shown, the electronic device 400 includes: a processor 401 and a memory 402 communicatively connected to the processor, the memory 402 stores instructions that can be executed by at least one processor, and the instructions are executed by at least one processor 401 to implement the reactive power compensation configuration method for an offshore wind farm as shown in the above embodiment.

[0086] In order to implement the above embodiment, the embodiment of the present application also proposes a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to enable the computer to implement the reactive power compensation configuration method of the offshore wind farm as shown in the above embodiment.

[0087] In order to implement the above embodiments, the embodiments of the present application further provide a computer program product, including a computer program, which, when executed by a processor, implements the reactive power compensation configuration method for an offshore wind farm as shown in the above embodiments.

[0088] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0089] In addition, the terms "first" and "second" are used for descriptive purposes only and should not 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 this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0090] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0091] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A reactive power compensation configuration method for an offshore wind farm, characterized in that: include: Obtain the total reactance compensation capacity corresponding to the first high-voltage reactor, the second high-voltage reactor and the low-voltage reactor in the offshore wind farm system, wherein, in the offshore wind farm system, the first submarine cable is a submarine cable located from the wind turbine to the offshore boost transformer, the second submarine cable is a submarine cable located from the offshore boost transformer to the land centralized control center, and the first high-voltage reactor and the second high-voltage reactor are respectively connected in parallel at both ends of the second submarine cable; Acquiring the SVG compensation capacity corresponding to the dynamic reactive power compensation device SVG in the offshore wind farm system, wherein the low-voltage reactor is connected in parallel with the SVG at the onshore centralized control center; According to a preset ratio, the total compensation capacity of the high-voltage reactors shared by the first high-voltage reactor and the second high-voltage reactor is determined, and the difference between the total compensation capacity of the reactors and the total compensation capacity of the high-voltage reactors is used as the compensation capacity of the low-voltage reactor, and the preset ratio is the ratio of the compensation capacity of the high-voltage reactor to the second charging power corresponding to the second submarine cable; Determining a compensation capacity interval of a first high-voltage reactor compensation capacity corresponding to the first high-voltage reactor; The compensation capacity of the first high-voltage reactor is set based on the compensation capacity interval, and the difference between the total compensation capacity of the high-voltage reactor and the compensation capacity of the first high-voltage reactor is used as the second high-voltage reactor compensation capacity corresponding to the second high-voltage reactor.

2. The reactive power compensation configuration method for an offshore wind farm according to claim 1, characterized in that: The obtaining of the total reactance compensation capacity corresponding to the first high-voltage reactor, the second high-voltage reactor and the low-voltage reactor in the offshore wind farm system includes: Obtaining a first charging power and a first reactive power loss corresponding to the first submarine cable; Obtaining a second charging power and a second reactive power loss corresponding to the second submarine cable; Obtaining the transformer reactive loss corresponding to the offshore boost transformer; The total reactance compensation capacity is obtained according to the first charging power, the first reactive loss, the second charging power, the second reactive loss and the transformer reactive loss.

3. The reactive power compensation configuration method for an offshore wind farm according to claim 2, characterized in that: The obtaining of the SVG compensation capacity corresponding to the dynamic reactive power compensation device SVG in the offshore wind farm system includes: Obtaining a sum of the first charging power and the second charging power; The difference between the sum and the total reactance compensation capacity is taken as the SVG compensation capacity.

4. The reactive power compensation configuration method for an offshore wind farm according to claim 3, characterized in that: The first high-voltage reactor and the second high-voltage reactor adopt a double-end compensation method; the low-voltage reactor and the SVG adopt a single-end compensation method.

5. The reactive power compensation configuration method for an offshore wind farm according to claim 4, characterized in that: The determining of the compensation capacity interval of the first high-voltage reactor compensation capacity corresponding to the first high-voltage reactor includes: Obtaining a maximum reactive power that can be passed by the second submarine cable without exceeding a maximum current carrying capacity; determining a minimum compensation capacity of the first high-voltage reactor according to the second charging power, the second reactive power loss and the maximum reactive power; Obtaining the total amount of reactive power collected from the wind farm outlet to the second submarine cable; Taking the difference between the maximum reactive power and the total reactive power as the maximum compensation capacity of the first high-voltage reactor; The compensation capacity interval is determined according to the minimum compensation capacity and the maximum compensation capacity.

6. The reactive power compensation configuration method for an offshore wind farm according to claim 5, characterized in that: The obtaining of the maximum reactive power that the second submarine cable can pass without exceeding the maximum current carrying capacity includes: Obtaining the apparent power corresponding to the second submarine cable; Acquiring active power transmitted by the second submarine cable; The maximum reactive power is determined according to the apparent power and the active power.

7. The reactive power compensation configuration method for an offshore wind farm according to claim 6, characterized in that: The obtaining the apparent power corresponding to the second submarine cable includes: Obtaining a rated voltage corresponding to the second submarine cable; Obtaining the maximum current carrying capacity allowed by the second submarine cable; The apparent power corresponding to the second submarine cable is determined according to the rated voltage and the maximum current carrying capacity.

8. A reactive power compensation configuration device for an offshore wind farm, characterized in that: include: A first acquisition module is used to acquire the total reactance compensation capacity corresponding to the first high-voltage reactor, the second high-voltage reactor and the low-voltage reactor in the offshore wind farm system, wherein, in the offshore wind farm system, the first submarine cable is a submarine cable located from the wind turbine to the offshore boost transformer section, the second submarine cable is a submarine cable located from the offshore boost transformer to the land centralized control center, and the first high-voltage reactor and the second high-voltage reactor are respectively connected in parallel at both ends of the second submarine cable; A second acquisition module is used to acquire the SVG compensation capacity corresponding to the dynamic reactive power compensation device SVG in the offshore wind farm system, wherein the low-voltage reactor is connected in parallel with the SVG at the onshore centralized control center; a first determination module, configured to determine a total compensation capacity of a high-voltage reactor shared by the first high-voltage reactor and the second high-voltage reactor according to a preset ratio, and use a difference between the total compensation capacity of the reactor and the total compensation capacity of the high-voltage reactor as a compensation capacity of a low-voltage reactor, wherein the preset ratio is a ratio of the compensation capacity of the high-voltage reactor to a second charging power corresponding to the second submarine cable; A second determination module, used to determine a compensation capacity interval of a first high-voltage reactor compensation capacity corresponding to the first high-voltage reactor; The third determination module is used to set the compensation capacity of the first high-voltage reactor based on the compensation capacity interval, and use the difference between the total compensation capacity of the high-voltage reactor and the compensation capacity of the first high-voltage reactor as the second high-voltage reactor compensation capacity corresponding to the second high-voltage reactor.

9. An electronic device, comprising: at least one processor; as well as a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method according to any one of claims 1 to 7.

10. A non-transitory computer-readable storage medium storing computer instructions, wherein: The computer instructions are used to cause the computer to execute the method according to any one of claims 1-7.

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