Filtering configuration method and system for low-harmonic offshore wind power sending-out device

Abstract

The invention discloses a filtering configuration method and system for a low-harmonic offshore wind power sending-out device, and relates to the technical field of harmonic suppression of a power system. A topological structure diagram of a to-be-configured wind power sending-out device is obtained, and power frequency parameters of a filter are generated according to the topological structure diagram; performing high-frequency group wave analysis on a filter of the to-be-configured wind power sending-out device based on the filter power frequency parameter to obtain a filter capacitance value and expected power frequency impedance, and determining a filter resistance value and a filter inductance value of the to-be-configured wind power sending-out device according to the filter capacitance value, the expected power frequency impedance and a preset filter resistance function, and the filtering resistance value, the filtering inductance value and the filtering capacitance value are used as filtering configuration parameters of the filter. The technical problems that an existing one-way current type uncontrolled rectification converter adopting diode elements at the sending end is used for sending out wind power, but uncontrolled rectification of a wind power plant needs harmonic suppression, an alternating current and direct current filtering device needs to be additionally configured, and the manufacturing cost of the scheme of adopting the diodes at the sending end is increased are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of harmonic suppression in power systems, and in particular to a filtering configuration method and system for a low-harmonic offshore wind power transmission device. Background Art

[0002] At present, offshore wind power mainly adopts the transmission mode of nearshore-AC and offshore-DC, and the capacity of a single offshore wind power transmission project is about one million kilowatts. With the exhaustion of offshore wind power development in the nearshore, deep-sea offshore wind power is the focus of future offshore wind power development. The existing offshore wind power AC transmission scheme cannot meet the needs of large-scale deep-sea offshore wind power development, while the traditional DC transmission scheme is costly and difficult to meet the needs of large-scale offshore wind power economic development. It is necessary to explore new low-cost transmission schemes to provide new technical options for deep-sea offshore wind power development. Large-scale offshore wind power has AC transmission and a variety of DC transmission conversion schemes.

[0003] At present, the mainstream solution for DC transmission in practical applications is to use a unidirectional current-type uncontrolled rectifier converter with diode elements at the sending end on a flexible DC transmission technology based on the MMC topology to achieve wind power transmission. However, the uncontrolled rectification of wind farms requires harmonic control and requires additional AC / DC filtering devices, which increases the cost of using the diode solution at the sending end. Summary of the invention

[0004] The present invention provides a low-harmonic offshore wind power transmission device filter configuration method and system, which solves the technical problem that in the existing flexible direct current transmission technology based on MMC topology, a unidirectional current type uncontrolled rectifier converter with diode elements is used at the sending end to realize wind power transmission, but the uncontrolled rectification of the wind farm needs to carry out harmonic control, and an additional AC / DC filtering device needs to be configured, which increases the cost of the diode solution at the sending end.

[0005] A first aspect of the present invention provides a low harmonic offshore wind power transmission device filtering configuration method, comprising:

[0006] Obtaining a topological structure diagram of a wind power transmission device to be configured, and generating filter power frequency parameters according to the topological structure diagram;

[0007] Based on the power frequency parameters of the filter, a high-frequency group wave analysis is performed on the filter of the wind power transmission device to be configured to obtain a filter capacitance value and an expected power frequency impedance;

[0008] Determining the filter resistance value and the filter inductance value of the wind power transmission device to be configured according to the filter capacitance value, the expected power frequency impedance and a preset filter resistance function;

[0009] The filter resistance value, the filter inductance value and the filter capacitance value are used as filter configuration parameters of the filter.

[0010] Optionally, the step of generating filter power frequency parameters according to the topological structure diagram includes:

[0011] Using the topological structure diagram to construct a simulation model of a wind power transmission device;

[0012] Performing phase control processing on the wind power transmission device simulation model to obtain a target wind power transmission model;

[0013] The target wind power transmission model is used to carry out a wave blocking test to obtain the power frequency parameters of the filter.

[0014] Optionally, the power frequency parameters of the filter include a first bus AC voltage, a second bus AC voltage and a filter harmonic current, and the step of performing high-frequency group wave analysis on the filter of the wind power transmission device to be configured based on the power frequency parameters of the filter to obtain a filter capacitance value and an expected power frequency impedance includes:

[0015] Obtaining the expected current value and harmonic limit value of the filter of the wind power transmission device to be configured;

[0016] Performing difference processing on the first bus AC voltage and the second bus AC voltage to obtain a first difference;

[0017] Performing ratio processing on the first difference and the expected current value to obtain a first ratio, and taking the absolute value of the first ratio as the expected power frequency impedance;

[0018] The pre-acquired power frequency angular frequency, the preset harmonic order and the harmonic limit value are multiplied to obtain a first product value;

[0019] The filter harmonic current is ratio-processed with the first multiplication value to obtain a filter capacitance value.

[0020] Optionally, the step of determining the filter resistance value and the filter inductance value of the wind power transmission device to be configured according to the filter capacitance value, the expected power frequency impedance and a preset filter resistance function includes:

[0021] Performing a square operation on the power frequency angular frequency to obtain a first square value;

[0022] Multiplying the first square value and the filter capacitance value to obtain a second multiplied value;

[0023] Performing ratio processing on the preset inductance coefficient and the second multiplication value to obtain the filter inductance value of the wind power transmission device to be configured;

[0024] Inputting the power frequency angular frequency, the filter inductance value and the expected power frequency impedance into a preset filter resistance function to obtain a first resistance value and a second resistance value;

[0025] The maximum value among the first resistance value, the second resistance value and the power frequency angular frequency is selected as the filter resistance value of the wind power transmission device to be configured.

[0026] Optionally, the step of performing phase control processing on the wind power transmission device simulation model to obtain a target wind power transmission model includes:

[0027] Acquire a first voltage phase of a first wind farm and a second voltage phase of a second wind farm in the simulation model of the wind power transmission device;

[0028] Performing difference processing on the first voltage phase and the second voltage phase to obtain a phase difference;

[0029] Performing difference processing on the phase difference value and a preset phase difference threshold to obtain a phase deviation value;

[0030] The phase parameter of the second wind farm in the wind power transmission device simulation model is adjusted according to the phase deviation value to obtain a target wind power transmission model.

[0031] Optionally, the filter resistance function is specifically:

[0032]

[0033] in, is the angular frequency corresponding to the maximum frequency deviation, is the angular frequency corresponding to the minimum frequency deviation, is the angular frequency of the power frequency, is the filter inductance value, is the first resistance value, is the second resistance value, is the expected power frequency impedance.

[0034] A second aspect of the present invention provides a low harmonic offshore wind power transmission device filter configuration system, comprising:

[0035] An acquisition module, used to obtain a topological structure diagram of a wind power transmission device to be configured, and generate filter power frequency parameters according to the topological structure diagram;

[0036] An adjustment module, configured to perform high-frequency group wave analysis on the filter of the wind power transmission device to be configured based on the power frequency parameters of the filter, so as to obtain a filter capacitance value and an expected power frequency impedance;

[0037] An analysis module, used to determine the filter resistance value and the filter inductance value of the wind power transmission device to be configured according to the filter capacitance value, the expected power frequency impedance and a preset filter resistance function;

[0038] A configuration module is used to adopt the filter resistance value, the filter inductance value and the filter capacitance value as filter configuration parameters of the filter.

[0039] A third aspect of the present invention provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the low harmonic offshore wind power transmission device filter configuration method as described in any one of the above items.

[0040] A fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed, the method for configuring filtering of a low harmonic offshore wind power transmission device as described in any one of the above items is implemented.

[0041] A fifth aspect of the present invention provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions, wherein when the program instructions are executed by a computer, the computer executes the low harmonic offshore wind power transmission device filtering configuration method as described in any one of the above items.

[0042] It can be seen from the above technical solutions that the present invention has the following advantages:

[0043] The present invention obtains a topological structure diagram of the wind power transmission device to be configured, and generates the filter power frequency parameters according to the topological structure diagram, thereby calculating the filter configuration parameters of the wind power transmission device to be configured according to the filter power frequency parameters. It overcomes the technical problem that the existing unidirectional current type uncontrolled rectifier converter using diode elements at the sending end is used to realize wind power transmission, but the uncontrolled rectification of the wind farm requires harmonic control, and additional AC and DC filtering devices are required, which increases the cost of the diode solution at the sending end. Compared with the traditional diode solution at the sending end, the present invention calculates the filter configuration parameters of the wind power transmission device to be configured through the filter power frequency parameters, and uses the filter configuration parameters to perform filter configuration on the wind power transmission device to be configured, while meeting the high harmonic suppression requirements of the wind power transmission device, reducing the volume and cost of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0045] Figure 1A flowchart of the steps of a low harmonic offshore wind power transmission device filtering configuration method provided in the first embodiment of the present invention;

[0046] Figure 2 A flowchart of the steps of a low harmonic offshore wind power transmission device filtering configuration method provided in the second embodiment of the present invention;

[0047] Figure 3 A schematic diagram of the structure of a low harmonic offshore wind power transmission device provided in the second embodiment of the present invention;

[0048] Figure 4 A schematic diagram of the structure of a filter provided in Embodiment 2 of the present invention;

[0049] Figure 5 An equivalent circuit diagram of a low harmonic offshore wind power transmission device provided in the second embodiment of the present invention;

[0050] Figure 6 A structural block diagram of a low harmonic offshore wind power transmission device filtering configuration system provided in Embodiment 3 of the present invention;

[0051] Figure 7 This is a structural block diagram of a computer device provided in Embodiment 4 of the present invention. DETAILED DESCRIPTION

[0052] The embodiment of the present invention provides a low-harmonic offshore wind power transmission device filter configuration method and system, which is used to solve the technical problem that in the existing flexible direct current transmission technology based on MMC topology, a unidirectional current type uncontrolled rectifier converter with diode elements is used at the sending end to realize wind power transmission, but the uncontrolled rectification of the wind farm needs to carry out harmonic control, and an additional AC / DC filtering device needs to be configured, which increases the cost of the diode solution at the sending end.

[0053] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] See also Figure 1 , Figure 1 A flowchart of the steps of a low harmonic offshore wind power transmission device filtering configuration method provided in Embodiment 1 of the present invention.

[0055] The present invention provides a low harmonic offshore wind power transmission device filtering configuration method, comprising:

[0056] Step 101, obtaining a topological structure diagram of a wind power transmission device to be configured, and generating filter power frequency parameters according to the topological structure diagram;

[0057] In the embodiment of the present invention, a topological structure diagram of a wind power transmission device to be configured is obtained, a wind power transmission simulation device model to be configured is constructed according to the topological structure diagram, and a phase control process is performed on the wind power transmission simulation device model to be configured according to a preset phase difference threshold value to obtain a target wind power transmission model. The target wind power transmission model is used to perform a blocking wave simulation to obtain the power frequency parameters of the filter.

[0058] Step 102: Perform high-frequency wave analysis on the filter of the wind power transmission device to be configured based on the power frequency parameters of the filter to obtain the filter capacitance value and the expected power frequency impedance.

[0059] In the embodiment of the present invention, the expected current value and harmonic limit value of the filter of the wind power transmission device to be configured are obtained, and the power frequency voltage and expected current value of the power frequency parameter of the filter are input into the preset expected power frequency impedance function to obtain the expected power frequency impedance. The power frequency parameter of the filter and the harmonic limit value are input into the preset filter capacitor constraint function to obtain the filter capacitor constraint interval, and the minimum value in the filter capacitor constraint interval is selected as the filter capacitor value.

[0060] It should be noted that the expected power frequency impedance function is specifically:

[0061]

[0062] in, is the expected power frequency impedance, is the expected current value, is the power frequency voltage, is the first busbar AC voltage, is the second bus AC voltage.

[0063] It should be noted that the filter capacitor constraint function is specifically:

[0064]

[0065] in, is the filter capacitor value, is the harmonic current of the filter, is the angular frequency of the power frequency, is the harmonic limit.

[0066] Step 103, determining the filter resistance value and the filter inductance value of the wind power transmission device to be configured according to the filter capacitance value, the expected power frequency impedance and the preset filter resistance function;

[0067] In an embodiment of the present invention, the filter capacitance value and the power frequency angular frequency are input into a preset filter inductance function to obtain a filter inductance value. The filter inductance value, the power frequency angular frequency and the expected power frequency impedance are input into a preset filter resistance constraint function to obtain a first constraint resistance interval and a second constraint resistance interval. The minimum value in the first constraint resistance interval is selected as the first resistance. The minimum value in the second constraint resistance interval is selected as the second resistance. The maximum value among the expected power frequency impedance, the first resistance and the second resistance is selected as the filter resistance value.

[0068] It should be noted that the filter inductance function is specifically:

[0069]

[0070] in, is the filter inductance value.

[0071] It should be noted that the filter resistance constraint function is specifically:

[0072]

[0073] in, is the angular frequency corresponding to the maximum frequency deviation, is the angular frequency corresponding to the minimum frequency deviation, is the angular frequency of the power frequency, is the filter inductance value, is the first resistance value, is the second resistance value, is the expected power frequency impedance.

[0074] Step 104: Use the filter resistance value, the filter inductance value and the filter capacitance value as the filter configuration parameters of the filter.

[0075] In the embodiment of the present invention, the filter resistance value, the filter inductance value and the filter capacitance value are used as the filter configuration parameters of the filter of the wind power transmission device to be configured.

[0076] In an embodiment of the present invention, the present invention obtains a topological structure diagram of the wind power transmission device to be configured, and generates the filter power frequency parameters according to the topological structure diagram, thereby calculating the filter configuration parameters of the wind power transmission device to be configured according to the filter power frequency parameters. This overcomes the technical problem that the existing unidirectional current-type uncontrolled rectifier converter using diode elements at the sending end is used to achieve wind power transmission, but the uncontrolled rectification of the wind farm requires harmonic control, and additional AC and DC filtering devices are required, which increases the cost of the diode solution at the sending end. Compared with the traditional diode solution at the sending end, the present invention calculates the filter configuration parameters of the wind power transmission device to be configured through the filter power frequency parameters, and uses the filter configuration parameters to perform filter configuration on the wind power transmission device to be configured, while meeting the requirements of the wind power transmission device to suppress high harmonics, reducing the volume and cost of the filter.

[0077] See also Figure 2 , Figure 2 A flowchart of the steps of a low harmonic offshore wind power transmission device filtering configuration method provided in Embodiment 2 of the present invention.

[0078] The present invention provides a low harmonic offshore wind power transmission device filtering configuration method, comprising:

[0079] Step 201, obtaining a topological structure diagram of a wind power transmission device to be configured, and using the topological structure diagram to construct a simulation model of the wind power transmission device;

[0080] In an embodiment of the present invention, a topological structure diagram of a wind power transmission device to be configured is obtained, and a simulation model of the wind power transmission device is constructed according to the topological structure diagram.

[0081] It should be noted that, see Figure 3 As shown, the diode converter valve of the wind power transmission device to be configured adopts a 12-pulse full-bridge structure, a 6-pulse converter A is connected to the YY transformer, and a 6-pulse converter B is connected to the YD transformer. Similarly, a 24-pulse full-bridge structure can be used, with the upper 12 pulses connected to the YY / YD structure and the lower 12 pulses connected to the YY / YD structure. The number of 12 pulses is N, and N is considered to be an arbitrary positive integer. The wind farm and converter transformer A and converter transformer B are connected through the grid-side bus, and a wave arrester (i.e., a filter) is connected between converter transformer A and converter A, and the other side of the wave arrester S2 is connected between converter transformer B and converter B. The phase angle difference between the YY transformer and the YD transformer is 30°, that is, assuming that the phase of converter transformer A is φ1, the fundamental voltage amplitude is U1, the phase of converter transformer B is φ2, and the fundamental voltage amplitude is U2, which satisfies the following formula: .

[0082] It is worth mentioning that a filter is connected between the AC buses of the two twelve-pulse diode commutation valves to: 1. Form a path for characteristic subharmonics between the two AC buses to achieve mutual cancellation of characteristic subharmonics. 2. Write a power frequency wave blocking effect between the two AC buses to avoid the inflow of power frequency current, which affects the filtering effect and reduces the setting requirements of the circuit.

[0083] Step 202, performing phase control processing on the wind power transmission device simulation model to obtain a target wind power transmission model;

[0084] Further, step 202 includes the following sub-steps:

[0085] S11, obtaining a first voltage phase of a first wind farm and a second voltage phase of a second wind farm in a simulation model of a wind power transmission device;

[0086] In the embodiment of the present invention, refer to Figure 5 As shown, a first voltage phase of a first wind farm (ie, wind farm 1) and a second voltage phase of a second wind farm (ie, wind farm 2) in a simulation model of a wind power transmission device are obtained.

[0087] S12, performing difference processing on the first voltage phase and the second voltage phase to obtain a phase difference;

[0088] In the embodiment of the present invention, a difference between the first voltage phase and the second voltage phase is calculated to obtain a phase difference.

[0089] S13, performing difference processing on the phase difference value and a preset phase difference threshold value to obtain a phase deviation value;

[0090] The phase difference threshold refers to the voltage phase difference between the first wind farm and the second wind farm under ideal conditions. The value is 15 degrees.

[0091] In the embodiment of the present invention, the difference between the phase difference value and a preset phase difference threshold is calculated to obtain the phase deviation value.

[0092] S14. Adjust the phase parameter of the second wind farm in the wind power transmission device simulation model according to the phase deviation value to obtain a target wind power transmission model.

[0093] In the embodiment of the present invention, the phase deviation value is input into a preset PI controller to obtain a phase given value, and the phase given value is input into a simulation model of a wind power transmission device to obtain a target wind power transmission model.

[0094] Step 203: Perform a wave blocking test using the target wind power transmission model to obtain the power frequency parameters of the filter.

[0095] In an embodiment of the present invention, a target wind power transmission model is used to carry out a wave blocking test, and the first bus AC voltage, the second bus AC voltage and the filter harmonic current of the target wind power transmission model at the 23rd harmonic are obtained as filter power frequency parameters.

[0096] Step 204: Perform high-frequency wave analysis on the filter of the wind power transmission device to be configured based on the power frequency parameters of the filter to obtain the filter capacitance value and the expected power frequency impedance;

[0097] Further, the power frequency parameters of the filter include the first bus AC voltage, the second bus AC voltage and the filter harmonic current, and step 204 includes the following sub-steps:

[0098] S21, obtaining the expected current value and harmonic limit value of the filter of the wind power transmission device to be configured;

[0099] S22, performing difference processing on the first bus AC voltage and the second bus AC voltage to obtain a first difference;

[0100] In the embodiment of the present invention, the expected current value and harmonic limit value of the filter of the wind power transmission device to be configured are obtained, and the difference between the first bus AC voltage and the second bus AC voltage is calculated to obtain the first difference.

[0101] S23, performing ratio processing on the first difference and the expected current value to obtain a first ratio, and taking the absolute value of the first ratio as the expected power frequency impedance;

[0102] In the embodiment of the present invention, the ratio between the first difference and the expected current value is calculated to obtain the first ratio, and the absolute value of the first ratio is used as the expected power frequency impedance.

[0103] S24, multiplying the pre-acquired power frequency angular frequency, the preset harmonic order and the harmonic limit value to obtain a first product value;

[0104] In the embodiment of the present invention, the power angular frequency of the filter is obtained, and the power angular frequency, the preset harmonic order and the harmonic limit value are multiplied to obtain a first product value.

[0105] It should be noted that, considering the filter requirements near the 23rd and 25th harmonics, the harmonic order value is taken as 23rd.

[0106] S25, performing ratio processing on the filter harmonic current and the first multiplication value to obtain a filter capacitance value.

[0107] In the embodiment of the present invention, the ratio between the filter harmonic current and the first multiplication value is calculated to obtain the filter capacitance value.

[0108] Step 205: Determine the filter resistance value and filter inductance value of the wind power transmission device to be configured according to the filter capacitance value, the expected power frequency impedance and the preset filter resistance function;

[0109] Further, step 205 includes the following sub-steps:

[0110] S31, performing a square operation on the power frequency angular frequency to obtain a first square value;

[0111] In the embodiment of the present invention, the square value of the power frequency angular frequency is calculated to obtain the first square value.

[0112] S32, multiplying the first square value and the filter capacitance value to obtain a second multiplied value;

[0113] In the embodiment of the present invention, a multiplication value between the first square value and the filter capacitance value is calculated to obtain a second multiplication value.

[0114] S33, performing ratio processing on the preset inductance coefficient and the second multiplication value to obtain the filter inductance value of the wind power transmission device to be configured;

[0115] In the embodiment of the present invention, the ratio between the preset inductance coefficient and the second multiplication value is calculated to obtain the filter inductance value of the wind power transmission device to be configured.

[0116] S34, inputting the power frequency angular frequency, the filter inductance value and the expected power frequency impedance into a preset filter resistance function to obtain a first resistance value and a second resistance value;

[0117] It should be noted that the filter resistance function is specifically:

[0118]

[0119] in, is the angular frequency corresponding to the maximum frequency deviation, is the angular frequency corresponding to the minimum frequency deviation, is the angular frequency of the power frequency, is the filter inductance value, is the first resistance value, is the second resistance value, is the expected power frequency impedance.

[0120] In the embodiment of the present invention, the power frequency angular frequency, the filter inductance value and the expected power frequency impedance are used as inputs of a preset filter resistance function to obtain a first resistance value and a second resistance value.

[0121] S35, selecting the maximum value among the first resistance value, the second resistance value and the power frequency angular frequency as the filter resistance value of the wind power transmission device to be configured.

[0122] In the embodiment of the present invention, a maximum value is selected from the first resistance value, the second resistance value and the power frequency angular frequency as the filter resistance value of the wind power transmission device to be configured.

[0123] Step 206: Use the filter resistance value, the filter inductance value and the filter capacitance value as the filter configuration parameters of the filter.

[0124] In the embodiment of the present invention, refer to Figure 4 As shown, the filter is a structure in which a capacitor and a reactor are connected in parallel, the filter capacitance value is used as the configuration parameter of the capacitor, and the filter resistance value and the filter inductance value are used as the configuration parameters of the reactor.

[0125] In an embodiment of the present invention, the present invention obtains a topological structure diagram of the wind power transmission device to be configured, and generates the filter power frequency parameters according to the topological structure diagram, thereby calculating the filter configuration parameters of the wind power transmission device to be configured according to the filter power frequency parameters. This overcomes the technical problem that the existing unidirectional current-type uncontrolled rectifier converter using diode elements at the sending end is used to achieve wind power transmission, but the uncontrolled rectification of the wind farm requires harmonic control, and additional AC and DC filtering devices are required, which increases the cost of the diode solution at the sending end. Compared with the traditional diode solution at the sending end, the present invention calculates the filter configuration parameters of the wind power transmission device to be configured through the filter power frequency parameters, and uses the filter configuration parameters to perform filter configuration on the wind power transmission device to be configured, while meeting the requirements of the wind power transmission device to suppress high harmonics, reducing the volume and cost of the filter.

[0126] See also Figure 6 , Figure 6 This is a structural block diagram of a low harmonic offshore wind power transmission device filtering configuration system provided in Embodiment 3 of the present invention.

[0127] The present invention provides a low harmonic offshore wind power transmission device filtering configuration system, comprising:

[0128] The acquisition module 301 is used to obtain a topological structure diagram of the wind power transmission device to be configured, and generate filter power frequency parameters according to the topological structure diagram;

[0129] The adjustment module 302 is used to perform high-frequency group wave analysis on the filter of the wind power transmission device to be configured based on the power frequency parameters of the filter to obtain the filter capacitance value and the expected power frequency impedance;

[0130] The analysis module 303 is used to determine the filter resistance value and the filter inductance value of the wind power transmission device to be configured according to the filter capacitance value, the expected power frequency impedance and the preset filter resistance function;

[0131] The configuration module 304 is used to use the filter resistance value, the filter inductance value and the filter capacitance value as the filter configuration parameters of the filter.

[0132] Furthermore, the acquisition module 301 includes:

[0133] A construction submodule is used to construct a simulation model of a wind power transmission device using a topological structure diagram;

[0134] The phase control submodule is used to perform phase control processing on the simulation model of the wind power transmission device to obtain the target wind power transmission model;

[0135] The wave blocking submodule is used to perform a wave blocking test using a target wind power transmission model to obtain the filter power frequency parameters.

[0136] Furthermore, the power frequency parameters of the filter include the first bus AC voltage, the second bus AC voltage and the filter harmonic current, and the adjustment module 302 includes:

[0137] A collection submodule, used to obtain the expected current value and harmonic limit value of the filter of the wind power transmission device to be configured;

[0138] A first operation submodule is used for performing difference processing on the first bus AC voltage and the second bus AC voltage to obtain a first difference;

[0139] A second operator module is used to perform ratio processing on the first difference and the expected current value to obtain a first ratio, and use the absolute value of the first ratio as the expected power frequency impedance;

[0140] A third operator module is used to perform product processing on the pre-acquired power frequency angular frequency, the preset harmonic order and the harmonic limit value to obtain a first product value;

[0141] The filter harmonic current is ratio-processed with the first multiplication value to obtain the filter capacitance value.

[0142] Furthermore, the analysis module 303 includes:

[0143] A fourth operator module, used for performing a square operation on the power frequency angular frequency to obtain a first square value;

[0144] a fifth operator module, configured to multiply the first square value and the filter capacitance value to obtain a second product value;

[0145] A sixth operator module, used for performing ratio processing on a preset inductance coefficient and a second multiplication value to obtain a filter inductance value of the wind power transmission device to be configured;

[0146] A seventh operator module, configured to input the power frequency angular frequency, the filter inductance value, and the expected power frequency impedance into a preset filter resistance function to obtain a first resistance value and a second resistance value;

[0147] The eighth operation submodule is used to select the maximum value among the first resistance value, the second resistance value and the power frequency angular frequency as the filter resistance value of the wind power transmission device to be configured.

[0148] Furthermore, the phase control submodule includes:

[0149] A collection unit, used to obtain a first voltage phase of a first wind farm and a second voltage phase of a second wind farm in a simulation model of a wind power transmission device;

[0150] A first operation unit is used for performing difference processing on the first voltage phase and the second voltage phase to obtain a phase difference;

[0151] The second operation unit is used to perform difference processing on the phase difference value and a preset phase difference threshold value to obtain a phase deviation value;

[0152] The regulating unit is used to adjust the phase parameter of the second wind farm in the wind power transmission device simulation model according to the phase deviation value to obtain the target wind power transmission model.

[0153] Furthermore, the filter resistance function is specifically:

[0154]

[0155] in, is the angular frequency corresponding to the maximum frequency deviation, is the angular frequency corresponding to the minimum frequency deviation, is the angular frequency of the power frequency, is the filter inductance value, is the first resistance value, is the second resistance value, is the expected power frequency impedance.

[0156] See also Figure 7 , Figure 7 This is a structural block diagram of a computer device provided in Embodiment 4 of the present invention.

[0157] An electronic device according to an embodiment of the present invention includes: a memory 401 and a processor 402, wherein the memory 402 stores a computer program; when the computer program is executed by the processor 402, the processor 402 executes a low harmonic offshore wind power transmission device filtering configuration method as described in any of the above embodiments.

[0158] The memory 401 may be an electronic memory such as a flash memory, an EEPROM (electrically erasable programmable read-only memory), an EPROM, a hard disk or a ROM. The memory 401 has a storage space 403 for a program code 413 for executing any method step in the above method. For example, the storage space 403 for the program code may include individual program codes 413 for implementing the various steps in the above method, respectively. These program codes may be read from or written to one or more computer program products. These computer program products include program code carriers such as hard disks, compact disks (CDs), memory cards or floppy disks. The program code may be compressed, for example, in an appropriate form. When these codes are run by a computing and processing device, the computing and processing device performs the various steps in the method described above. These program codes may be read from or written to one or more computer program products. These computer program products include program code carriers such as hard disks, compact disks (CDs), memory cards or floppy disks. The program code may be compressed, for example, in an appropriate form. When these codes are executed by a computing and processing device, they cause the computing and processing device to execute the various steps in the above-described low harmonic offshore wind power transmission device filter configuration method.

[0159] Embodiment 5 of the present invention further provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the method for configuring filtering of a low harmonic offshore wind power transmission device as described in any of the above embodiments is implemented.

[0160] Embodiment 6 of the present invention further provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions, wherein when the program instructions are executed by a computer, the computer executes a low harmonic offshore wind power transmission device filtering configuration method as described in any of the above embodiments.

[0161] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0162] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0163] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0164] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0165] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0166] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A low harmonic offshore wind power transmission device filtering configuration method, characterized in that: include: Obtaining a topological structure diagram of a wind power transmission device to be configured, and generating filter power frequency parameters according to the topological structure diagram; Based on the power frequency parameters of the filter, a high-frequency group wave analysis is performed on the filter of the wind power transmission device to be configured to obtain a filter capacitance value and an expected power frequency impedance; Determining the filter resistance value and the filter inductance value of the wind power transmission device to be configured according to the filter capacitance value, the expected power frequency impedance and a preset filter resistance function; The filter resistance value, the filter inductance value and the filter capacitance value are used as filter configuration parameters of the filter.

2. The low harmonic offshore wind power transmission device filter configuration method according to claim 1 is characterized in that: The step of generating the filter power frequency parameters according to the topological structure diagram comprises: Using the topological structure diagram to construct a simulation model of a wind power transmission device; Performing phase control processing on the wind power transmission device simulation model to obtain a target wind power transmission model; The target wind power transmission model is used to carry out a wave blocking test to obtain the power frequency parameters of the filter.

3. The low harmonic offshore wind power transmission device filter configuration method according to claim 1, characterized in that: The power frequency parameters of the filter include the first bus AC voltage, the second bus AC voltage and the filter harmonic current. The step of performing high-frequency group wave analysis on the filter of the wind power transmission device to be configured based on the power frequency parameters of the filter to obtain the filter capacitance value and the expected power frequency impedance includes: Obtaining the expected current value and harmonic limit value of the filter of the wind power transmission device to be configured; Performing difference processing on the first bus AC voltage and the second bus AC voltage to obtain a first difference; Performing ratio processing on the first difference and the expected current value to obtain a first ratio, and taking the absolute value of the first ratio as the expected power frequency impedance; The pre-acquired power frequency angular frequency, the preset harmonic order and the harmonic limit value are multiplied to obtain a first product value; The filter harmonic current is ratio-processed with the first multiplication value to obtain a filter capacitance value.

4. The low harmonic offshore wind power transmission device filter configuration method according to claim 3 is characterized in that: The step of determining the filter resistance value and the filter inductance value of the wind power transmission device to be configured according to the filter capacitance value, the expected power frequency impedance and the preset filter resistance function comprises: Performing a square operation on the power frequency angular frequency to obtain a first square value; Multiplying the first square value and the filter capacitance value to obtain a second multiplied value; Performing ratio processing on the preset inductance coefficient and the second multiplication value to obtain the filter inductance value of the wind power transmission device to be configured; Inputting the power frequency angular frequency, the filter inductance value and the expected power frequency impedance into a preset filter resistance function to obtain a first resistance value and a second resistance value; The maximum value among the first resistance value, the second resistance value and the power frequency angular frequency is selected as the filter resistance value of the wind power transmission device to be configured.

5. The low harmonic offshore wind power transmission device filtering configuration method according to claim 2 is characterized in that: The step of performing phase control processing on the wind power transmission device simulation model to obtain a target wind power transmission model includes: Acquire a first voltage phase of a first wind farm and a second voltage phase of a second wind farm in the simulation model of the wind power transmission device; Performing difference processing on the first voltage phase and the second voltage phase to obtain a phase difference; Performing difference processing on the phase difference value and a preset phase difference threshold to obtain a phase deviation value; The phase parameter of the second wind farm in the wind power transmission device simulation model is adjusted according to the phase deviation value to obtain a target wind power transmission model.

6. The low harmonic offshore wind power transmission device filter configuration method according to claim 1, characterized in that: The filter resistance function is specifically: in, is the angular frequency corresponding to the maximum frequency deviation, is the angular frequency corresponding to the minimum frequency deviation, is the angular frequency of the power frequency, is the filter inductance value, is the first resistance value, is the second resistance value, is the expected power frequency impedance.

7. A low harmonic offshore wind power transmission device filtering configuration system, characterized in that: include: An acquisition module, used to obtain a topological structure diagram of a wind power transmission device to be configured, and generate filter power frequency parameters according to the topological structure diagram; An adjustment module, configured to perform high-frequency group wave analysis on the filter of the wind power transmission device to be configured based on the power frequency parameters of the filter, so as to obtain a filter capacitance value and an expected power frequency impedance; An analysis module, used to determine the filter resistance value and the filter inductance value of the wind power transmission device to be configured according to the filter capacitance value, the expected power frequency impedance and a preset filter resistance function; A configuration module is used to adopt the filter resistance value, the filter inductance value and the filter capacitance value as filter configuration parameters of the filter.

8. An electronic device, characterized in that: It comprises a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the processor executes the steps of the low harmonic offshore wind power transmission device filtering configuration method as described in any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed, the low harmonic offshore wind power transmission device filtering configuration method as described in any one of claims 1-6 is implemented.

10. A computer program product, characterized in that The computer program product includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions, wherein when the program instructions are executed by a computer, the computer is caused to execute the low harmonic offshore wind power transmission device filtering configuration method as described in any one of claims 1-6.

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