CN117477642B - Asymmetric fault ride-through control method and device for multiple wind power plants and electronic equipment - Google Patents
Asymmetric fault ride-through control method and device for multiple wind power plants and electronic equipment Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
The application discloses an asymmetric fault ride-through control method, an asymmetric fault ride-through control device and electronic equipment for multiple wind power plants, which can calculate current instructions required to be output by each wind power plant, realize multi-target voltage control of a wind power system through the current instructions and improve fault ride-through capacity of the power system with the multiple wind power plants. The method comprises the following steps: acquiring the line negative sequence reactance and the line negative sequence impedance of a branch at each wind power station; comparing the line negative sequence reactance with the square of the line negative sequence impedance, determining the negative sequence voltage regulation capacity of each wind power plant, and adding the negative sequence voltage regulation capacity of each wind power plant to obtain the total negative sequence voltage regulation capacity corresponding to a plurality of wind power plants; when an asymmetric short circuit fault occurs in the public transmission line, comparing the negative sequence voltage of the fault point with the total negative sequence voltage regulation capacity, and calculating a negative sequence current instruction value corresponding to each wind power plant according to the comparison result; and according to the negative sequence current instruction value, reducing the negative sequence voltage of the common connection point in the wind power grid connection.
Description
Technical Field
The application relates to the technical field of power system protection and control, in particular to an asymmetric fault ride-through control method and device for a multi-wind power plant and electronic equipment.
Background
The large wind power plants are generally distributed in remote areas in a centralized manner, the electric distance from the synchronous generator set is far, and a multi-stage transformer exists, so that the wind power grid connection point presents weak current network characteristics with low short circuit ratio, the voltage supporting capability is poor, the fault ride-through capability of renewable energy sources is reduced, and under severe grid symmetrical short circuit faults, multiple wind power systems can have interlocking off-grid accidents, and the fault ride-through capability of the wind power systems is further deteriorated. Therefore, under the asymmetric short-circuit fault of the power grid, improving the fault ride-through capability of the wind power system is a key problem of wind power development at present.
Disclosure of Invention
In view of the above, the application provides a method, a device and an electronic device for controlling asymmetric fault ride-through of a multi-wind power plant, which mainly aim to solve the problem of improving the fault ride-through capability of a wind power system under the asymmetric short-circuit fault of a power grid.
According to a first aspect of the present application, there is provided a method of asymmetric fault ride-through control of a multi-wind farm, the method comprising:
In wind power grid connection, obtaining the line negative sequence reactance and the line negative sequence impedance of a branch at each wind power place;
Comparing the line negative sequence reactance with the square of the line negative sequence impedance, determining the negative sequence voltage adjustment capability of the wind power plants according to a first comparison result, and adding the negative sequence voltage adjustment capability of each wind power plant to obtain total negative sequence voltage adjustment capability corresponding to a plurality of wind power plants;
When an asymmetric short circuit fault occurs in a public transmission line, detecting a fault point negative sequence voltage and a grid-connected point positive sequence voltage, comparing the fault point negative sequence voltage with the total negative sequence voltage regulation capacity, and calculating a negative sequence current instruction value corresponding to each wind power plant according to a second comparison result;
And reducing the negative sequence voltage of the common connection point in the wind power grid connection according to the negative sequence current instruction value.
According to a second aspect of the present application there is provided an asymmetric fault ride-through control device for a multi-wind farm, the device comprising:
The acquisition module is used for acquiring the line negative sequence reactance and the line negative sequence impedance of the branch at each wind power place in wind power grid connection;
The comparison module is used for comparing the line negative sequence reactance with the square of the line negative sequence impedance, and determining the negative sequence voltage regulation capability of the wind power plant according to a first comparison result;
The calculation module is used for adding the negative sequence voltage adjustment capability of each wind power plant to obtain total negative sequence voltage adjustment capability corresponding to a plurality of wind power plants, comparing the detected fault point negative sequence voltage with the total negative sequence voltage adjustment capability, and calculating a negative sequence current instruction value corresponding to each wind power plant according to a second comparison result;
and the adjusting module is used for reducing the negative sequence voltage of the common connection point in the wind power grid connection according to the negative sequence current instruction value.
According to a third aspect of the present application there is provided an electronic device comprising a memory storing a computer program and a processor implementing the steps of any of the methods of the first aspect described above when the computer program is executed by the processor.
By means of the technical scheme, the asymmetric fault ride-through control method and device for the multi-wind power plant and the electronic equipment provided by the application can calculate current instructions required to be output by each wind power plant according to the capacity, the fault position, the fault degree and the wind power plant operation working condition of the wind power plant, realize multi-target voltage control of a wind power system through the current instructions, and improve the fault ride-through capability of the power system with the multi-wind power plant.
The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
fig. 1 shows a schematic flow diagram of an asymmetric fault ride-through control method for a multi-wind farm according to an embodiment of the present application;
Fig. 2 shows a flow diagram of an asymmetric fault ride-through control method for a multi-wind farm according to an embodiment of the present application;
fig. 3 shows a schematic diagram of an asymmetric fault ride-through control system of a multi-wind farm according to an embodiment of the present application;
Fig. 4 shows a schematic diagram of an asymmetric fault ride-through control device for a multi-wind farm according to an embodiment of the present application;
FIG. 5 shows a simulated waveform of a three-parallel wind farm at high wind speeds provided by an embodiment of the present application;
FIG. 6 shows a simulated waveform of a three-parallel wind farm at high wind speeds provided by an embodiment of the present application;
FIG. 7 shows a simulated waveform of a three-parallel wind farm at high wind speeds provided by an embodiment of the present application;
FIG. 8 shows a simulated waveform of a three-parallel wind farm at high wind speeds provided by an embodiment of the present application;
FIG. 9 shows a simulated waveform of a three-parallel wind farm at high wind speeds provided by an embodiment of the present application;
FIG. 10 shows a simulated waveform of a three-parallel wind farm at high wind speeds provided by an embodiment of the present application;
FIG. 11 shows a simulated waveform of a three-parallel wind farm at high wind speeds provided by an embodiment of the present application;
FIG. 12 shows a simulated waveform of a three-parallel wind farm at high wind speeds provided by an embodiment of the present application;
FIG. 13 shows a simulated waveform of a three-parallel wind farm at high wind speeds provided by an embodiment of the present application;
FIG. 14 shows a simulated waveform of a three-parallel wind farm at high wind speeds provided by an embodiment of the present application;
FIG. 15 shows a simulated waveform of a three-parallel wind farm at high wind speeds provided by an embodiment of the present application;
FIG. 16 shows a simulated waveform of a three-parallel wind farm at high wind speeds provided by an embodiment of the present application;
FIG. 17 shows a simulated waveform of a three-parallel wind farm at low wind speeds provided by an embodiment of the present application;
FIG. 18 shows a simulated waveform of a three-parallel wind farm at low wind speeds provided by an embodiment of the present application;
FIG. 19 shows a simulated waveform of a three-parallel wind farm at low wind speeds provided by an embodiment of the present application;
FIG. 20 shows a simulated waveform of a three-parallel wind farm at low wind speeds provided by an embodiment of the present application;
FIG. 21 shows a simulated waveform of a three-parallel wind farm at low wind speeds provided by an embodiment of the present application;
FIG. 22 shows a simulated waveform of a three-parallel wind farm at low wind speeds provided by an embodiment of the present application;
FIG. 23 shows a simulated waveform of a three-parallel wind farm at low wind speeds provided by an embodiment of the present application;
FIG. 24 shows a simulated waveform of a three-parallel wind farm at low wind speeds provided by an embodiment of the present application;
FIG. 25 shows a simulated waveform of a three-parallel wind farm at low wind speeds provided by an embodiment of the present application;
FIG. 26 shows a simulated waveform of a three-parallel wind farm at low wind speeds provided by an embodiment of the present application;
FIG. 27 shows a simulated waveform of a three-parallel wind farm at low wind speeds provided by an embodiment of the present application;
FIG. 28 shows a simulated waveform of a three-parallel wind farm at low wind speeds provided by an embodiment of the present application.
Detailed Description
Exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.
With the rapid development of wind power generation, the installed capacity of wind power is continuously increased, but the wind power plant is often in inverse distribution with load, the large wind power plant is usually concentrated in remote areas, the electric distance from a synchronous generator set is far, and a multi-stage transformer exists, so that the wind power grid-connected point presents weak grid characteristics with low short circuit ratio, the voltage supporting capability is poor, the fault crossing capability of renewable energy sources is reduced, and the safe and stable operation of a power system is seriously threatened. Therefore, under the asymmetric short-circuit fault of the power grid, improving the fault ride-through capability of the wind power system is a key problem of wind power development at present. At present, related researches developed by students at home and abroad mainly focus on two aspects of interaction between a generator set and reactive compensation equipment and improvement of a wind farm control strategy, such as the following published documents:
[1] Yongchang, wang Delin, ma Mengyang, et al SVG cooperated with the voltage control strategy of DFIG unit to study [ J ]. Electrical engineering, 2021 (22): 55-60+64.
[2] Zhang Zhe, wang Chengfu, dong Xiaoming, etc. wind farm voltage coordination control strategy based on hierarchical model predictive control [ J ]. Power System Automation 2019,43 (11): 34-42+94.
The literature [1] designs a coordinated reactive power distribution control strategy of a static reactive power generator and a DFIG by utilizing the response rapid characteristic of the static reactive power generator, and can rapidly adjust the node voltage. And the literature [2] carries out layering on the control process from the time level angle, and respectively carries out real-time model prediction control at different time scales, thereby fully playing the reactive power regulation capability of each unit. None of the above documents, however, calculate the current command for a wind farm. In fact, during an asymmetric short-circuit fault of the power grid, the voltage quality of a common connection point of the wind power system is reduced, so that the fault ride-through capability of the system is reduced, and under a severe symmetric short-circuit fault of the power grid, a cascading off-grid accident of a plurality of wind power systems can occur, so that the fault ride-through capability of the wind power systems is further deteriorated. Therefore, the application provides an asymmetric fault ride-through control method for a plurality of wind power plants, which comprises the steps of firstly, in wind power grid connection, obtaining the line negative sequence reactance and the line negative sequence impedance of a branch at each wind power plant, and comparing the square of the line negative sequence reactance and the line negative sequence impedance. And further, according to the first comparison result, determining the negative sequence voltage adjustment capability of the wind power plants, and adding the negative sequence voltage adjustment capability of each wind power plant to obtain the total negative sequence voltage adjustment capability corresponding to the wind power plants. Further, when an asymmetric short circuit fault occurs in the public transmission line, detecting the negative sequence voltage of the fault point and the positive sequence voltage of the grid-connected point, and comparing the negative sequence voltage of the fault point with the total negative sequence voltage regulation capability. And calculating a negative sequence current instruction value corresponding to each wind power plant according to the second comparison result. And finally, according to the negative sequence current instruction value, reducing the negative sequence voltage of the common connection point in the wind power grid connection. According to the embodiment of the application, the current instruction required to be output by each electric field can be calculated according to the capacity, the fault position, the fault degree and the running working condition of the wind power field, the multi-target voltage control of the wind power system is realized through the current instruction, and the fault crossing capacity of the electric power system with multiple wind power fields is improved.
The embodiment of the application provides an asymmetric fault ride-through control method of a multi-wind power plant, which comprises the following steps of:
101. And in wind power grid connection, obtaining the line negative sequence reactance and the line negative sequence impedance of the branch at each wind power station.
102. And comparing the line negative sequence reactance with the square of the line negative sequence impedance, determining the negative sequence voltage adjustment capability of the wind power plants according to a first comparison result, and adding the negative sequence voltage adjustment capability of each wind power plant to obtain the total negative sequence voltage adjustment capability corresponding to a plurality of wind power plants.
103. When the public transmission line has an asymmetric short circuit fault, detecting the negative sequence voltage of the fault point and the positive sequence voltage of the grid-connected point, comparing the negative sequence voltage of the fault point with the total negative sequence voltage regulating capacity, and calculating a negative sequence current command value corresponding to each wind power plant according to a second comparison result.
104. And according to the negative sequence current instruction value, reducing the negative sequence voltage of the common connection point in the wind power grid connection.
According to the asymmetric fault ride-through control method for the multiple wind power plants, firstly, in wind power grid connection, line negative sequence reactance and line negative sequence impedance of branches at each wind power plant are obtained, and the line negative sequence reactance is compared with the square of the line negative sequence impedance. And further, according to the first comparison result, determining the negative sequence voltage adjustment capability of the wind power plants, and adding the negative sequence voltage adjustment capability of each wind power plant to obtain the total negative sequence voltage adjustment capability corresponding to the wind power plants. Further, when an asymmetric short circuit fault occurs in the public transmission line, detecting the negative sequence voltage of the fault point and the positive sequence voltage of the grid-connected point, and comparing the negative sequence voltage of the fault point with the total negative sequence voltage regulation capability. And calculating a negative sequence current instruction value corresponding to each wind power plant according to the second comparison result. And finally, according to the negative sequence current instruction value, reducing the negative sequence voltage of the common connection point in the wind power grid connection. According to the embodiment of the application, the current instruction required to be output by each electric field can be calculated according to the capacity, the fault position, the fault degree and the running working condition of the wind power field, the multi-target voltage control of the wind power system is realized through the current instruction, and the fault crossing capacity of the electric power system with multiple wind power fields is improved.
Further, as a refinement and expansion of the specific implementation manner of the foregoing embodiment, in order to fully explain the implementation process of the embodiment, the embodiment of the present application provides an asymmetric fault ride-through control method for a multiple wind farm, as shown in fig. 2, where the method includes:
201. And in wind power grid connection, obtaining the line negative sequence reactance and the line negative sequence impedance of the branch at each wind power station.
The method is used for improving the fault ride-through capability of the multi-wind power plant under the asymmetric short-circuit fault of the power grid. Based on the topological structure schematic diagram of the power system of the multiple wind power plants shown in fig. 3, basic parameters of each branch including positive sequence inductance, positive sequence resistance, line length and the like can be collected, and further based on the symmetrical component theory of the power system, negative sequence parameters can be obtained through positive sequence parameter calculation, so that line negative sequence reactance X n - and line negative sequence impedance Z n - of the branch at each wind power plant are obtained.
202. And comparing the line negative sequence reactance with the square of the line negative sequence impedance, and determining the negative sequence voltage regulation capability of the wind power plant according to a first comparison result.
And the wind power grid connection adopts a generator convention, the line negative sequence reactance is compared with the square of the line negative sequence impedance according to the following formula 1, and the negative sequence voltage regulation capability of the wind power plant is determined according to a first comparison result. Specifically, when the first comparison result indicates that the line negative sequence reactance is smaller than the line negative sequence impedance, the preset value 0 is used as the negative sequence voltage regulation capability of the corresponding wind power plant. When the first comparison result indicates that the line negative sequence reactance is larger than or equal to the line negative sequence impedance, obtaining the negative sequence current capacity of the converter of the corresponding wind power plantObtaining line negative sequence impedance from fault point to public connection point on public transmission lineBy means ofAndCalculating to obtain the negative sequence voltage regulation capability of each wind power plant
Wherein,Is the negative sequence voltage regulation capability of the wind farm,Is the negative sequence current capacity of the current transformer of the wind farm,Is the line negative sequence impedance from the point of failure on the common transmission line to the point of common connection.
203. And adding the negative sequence voltage adjustment capability of each wind power plant to obtain the total negative sequence voltage adjustment capability corresponding to the wind power plants.
In the step, according to the following formula 2, adding the negative sequence voltage adjustment capability of each wind power plant to obtain total negative sequence voltage adjustment capability corresponding to a plurality of wind power plants;
equation 2:
Wherein, For the total negative sequence voltage regulation capability,Is the negative sequence voltage regulation capability of the nth wind power plant.
204. When the public transmission line has an asymmetric short circuit fault, detecting the negative sequence voltage of the fault point and the positive sequence voltage of the grid-connected point, comparing the negative sequence voltage of the fault point with the total negative sequence voltage regulating capacity, and calculating a negative sequence current command value corresponding to each wind power plant according to a second comparison result.
In this step, when an asymmetric short-circuit fault occurs in the common transmission line, the negative sequence voltage at the fault point is detectedAnd grid-connected point positive sequence voltageNegative sequence voltage of fault pointCapability of regulating total negative sequence voltageAnd comparing, and calculating a negative sequence current instruction value corresponding to each wind power plant according to a second comparison result.
In particular, if a fault point negative sequence voltage is employedThe orientation indicates that the negative sequence voltage of the fault point is less than or equal to the total negative sequence voltage regulation capability at the second comparison result, namelyWhen the following formula 3 is adopted to calculate the negative sequence current command value corresponding to each wind farm, it should be noted that the negative sequence current command value includes the d-axis negative sequence current command valueAnd negative sequence current command value of q axis
Equation 3:
Wherein, Is a negative sequence current instruction value of the nth wind power plant on the d axis; is a negative sequence current instruction value of the nth wind power plant on the q axis; The line resistance value from the fault point to the public connection point on the public transmission line; Is the line negative sequence reactance value from the fault point to the public connection point on the public transmission line; Is the fault point negative sequence voltage; Negative sequence voltage regulation capability for the nth wind farm; Is the total negative sequence voltage regulation capability. Indicating that the fault point negative sequence voltage is greater than the total negative sequence voltage regulation capability at the second comparison result, i.e And when the negative sequence current instruction value corresponding to each wind power plant is calculated by adopting the following formula 4.
Equation 4:
If grid-connected positive sequence voltage is adopted The orientation indicates that the negative sequence voltage of the fault point is less than or equal to the total negative sequence voltage regulation capability at the second comparison result, namelyAnd when the negative sequence current instruction value corresponding to each wind power plant is calculated by adopting the following formula 5.
Equation 5:
Wherein the negative sequence current command value comprises a d-axis negative sequence current command value And negative sequence current command value of q axisIndicating that the fault point negative sequence voltage is greater than the total negative sequence voltage regulation capability at the second comparison result, i.eWhen the active power controllable operation domain is calculated by adopting the following formula 6.
Equation 6:
wherein i maxn is the current capacity of the current transformer of the wind farm; Is the transmission line resistance between the common connection point and the wind farm n. And further obtaining the active power output P of the maximum wind energy tracking, comparing the active power output P with the active power controllable operation domain P maxn, and calculating a negative sequence current instruction value of a d axis corresponding to each wind power plant according to a third comparison result And negative sequence current command value of q axisIn particular, when the active power output of maximum wind energy tracking is greater than the active power controllable operating domain, i.eAnd when P is more than P maxn, calculating a negative sequence current instruction value corresponding to each wind power plant by adopting the following formula 7. When the active power output of the maximum wind energy tracking is smaller than or equal to the active power controllable operation domain, namelyAnd when P is less than or equal to P maxn, calculating a negative sequence current instruction value corresponding to each wind power plant by adopting the following formula 8.
Equation 7:
Equation 8:
205. and according to the negative sequence current instruction value, reducing the negative sequence voltage of the common connection point in the wind power grid connection.
According to the method, the wind power plant is controlled by calculating the output current value of the multi-parallel wind power plant in the power grid fault period, so that the multi-target voltage control of the wind power system is realized, and the fault ride-through capability of the system is improved.
In the method provided by the embodiment of the application, firstly, in wind power grid connection, the line negative sequence reactance and the line negative sequence impedance of a branch at each wind power place are obtained, and the line negative sequence reactance is compared with the square of the line negative sequence impedance. And further, according to the first comparison result, determining the negative sequence voltage adjustment capability of the wind power plants, and adding the negative sequence voltage adjustment capability of each wind power plant to obtain the total negative sequence voltage adjustment capability corresponding to the wind power plants. Further, when an asymmetric short circuit fault occurs in the public transmission line, detecting the negative sequence voltage of the fault point and the positive sequence voltage of the grid-connected point, and comparing the negative sequence voltage of the fault point with the total negative sequence voltage regulation capability. And calculating a negative sequence current instruction value corresponding to each wind power plant according to the second comparison result. And finally, according to the negative sequence current instruction value, reducing the negative sequence voltage of the common connection point in the wind power grid connection. According to the embodiment of the application, the current instruction required to be output by each electric field can be calculated according to the capacity, the fault position, the fault degree and the running working condition of the wind power field, the multi-target voltage control of the wind power system is realized through the current instruction, and the fault crossing capacity of the electric power system with multiple wind power fields is improved.
Further, as a specific implementation of the method shown in fig. 1, an embodiment of the present application provides an asymmetric fault ride-through control device for a multiple wind farm, as shown in fig. 4, where the device includes: an acquisition module 401, a comparison module 402, a calculation module 403, and an adjustment module 404.
The obtaining module 401 is configured to obtain a line negative sequence reactance and a line negative sequence impedance of a branch at each wind farm in wind power grid connection;
The comparison module 402 is configured to compare the line negative sequence reactance with the square of the line negative sequence impedance, and determine a negative sequence voltage regulation capability of the wind farm according to a first comparison result;
The calculating module 403 is configured to add the negative sequence voltage adjustment capabilities of each wind farm to obtain total negative sequence voltage adjustment capabilities corresponding to a plurality of wind farms, compare the detected fault point negative sequence voltage with the total negative sequence voltage adjustment capabilities, and calculate a negative sequence current command value corresponding to each wind farm according to a second comparison result;
the adjusting module 404 is configured to reduce a negative sequence voltage of a common connection point in the wind power grid connection according to the negative sequence current command value.
In a specific application scenario, the comparison module 402 is configured to use a preset value as a negative sequence voltage adjustment capability of a corresponding wind farm when the first comparison result indicates that the line negative sequence reactance is smaller than the line negative sequence impedance, where the preset value is 0; when the first comparison result indicates that the line negative sequence reactance is larger than or equal to the line negative sequence impedance, obtaining the negative sequence current capacity of a converter corresponding to the wind power plant, obtaining the line negative sequence impedance from a fault point on a public transmission line to the public connection point, and calculating the negative sequence voltage regulation capacity of the wind power plant by adopting the following relation;
Wherein, Is the negative sequence voltage regulation capability of the wind farm,Is the negative sequence current capacity of the converters of the wind farm,Is the line negative sequence impedance from the point of failure on the common transmission line to the point of common connection.
In a specific application scenario, the calculating module 403 is configured to add the negative sequence voltage adjustment capability of each wind farm according to the following relation, so as to obtain total negative sequence voltage adjustment capability corresponding to a plurality of wind farms;
Wherein, For the total negative sequence voltage regulation capability,Is the negative sequence voltage regulation capability of the nth wind power plant.
In a specific application scenario, the calculating module 403 is configured to calculate, if the fault point negative sequence voltage orientation is adopted, a negative sequence current instruction value corresponding to each wind farm by using the following relation when the second comparison result indicates that the fault point negative sequence voltage is less than or equal to the total negative sequence voltage adjustment capability, where the negative sequence current instruction value includes a d-axis negative sequence current instruction value and a q-axis negative sequence current instruction value;
Wherein, Is the negative sequence current instruction value of the nth wind farm on the d axis,Is the negative sequence current instruction value of the nth wind farm on the q axis,Is the line resistance value from the point of failure on the common transmission line to the point of common connection,Is the line negative sequence reactance value from the fault point to the common connection point on the common transmission line,Is the fault point negative sequence voltage,For the negative sequence voltage regulation capability of the nth wind farm,Capability is adjusted for the total negative sequence voltage.
In a specific application scenario, the calculating module 403 is configured to calculate, if the fault point negative sequence voltage orientation is adopted, a negative sequence current instruction value corresponding to each wind farm according to the following relation when the second comparison result indicates that the fault point negative sequence voltage is greater than the total negative sequence voltage adjustment capability;
Wherein, Is the negative sequence current capacity of the current transformer.
In a specific application scenario, the calculating module 403 is further configured to calculate, if the grid-connected point positive sequence voltage orientation is adopted, a negative sequence current instruction value corresponding to each wind farm by using the following relation when the second comparison result indicates that the fault point negative sequence voltage is less than or equal to the total negative sequence voltage adjustment capability, where the negative sequence current instruction value includes a negative sequence current instruction value of d-axis and a negative sequence current instruction value of q-axis;
Wherein, Is the negative sequence current instruction value of the nth wind farm on the d axis,Is the negative sequence current instruction value of the nth wind farm on the q axis,Is the positive sequence voltage of the grid connection point.
In a specific application scenario, the calculating module 403 is configured to calculate, if the grid-connected point positive sequence voltage orientation is adopted, an active power controllable operation domain by using the following relation when the second comparison result indicates that the fault point negative sequence voltage is greater than the total negative sequence voltage adjustment capability;
wherein P maxn is the active power controllable operating domain, i maxn is the current capacity of the converter of the wind farm, Is the fault point negative sequence voltage,Is the negative sequence voltage regulation capability of the nth wind farm,Is the total negative sequence voltage regulation capability,Is the line negative sequence impedance from the point of failure on the common transmission line to the point of common connection,The resistance value of a transmission line between the public connection point and the wind power plant n is set; and acquiring active power output of maximum wind energy tracking, comparing the active power output with the active power controllable operation domain, and calculating a negative sequence current instruction value corresponding to each wind power plant according to a third comparison result.
In a specific application scenario, the calculating module 403 is configured to calculate, when the active power output of the maximum wind energy tracking is greater than the active power controllable operation domain, a negative sequence current instruction value corresponding to each wind farm by using the following relation;
When the active power output of maximum wind energy tracking is smaller than or equal to the active power controllable operation domain, calculating a negative sequence current instruction value corresponding to each wind power plant by adopting the following relation;
In the device provided by the embodiment of the application, firstly, in wind power grid connection, the line negative sequence reactance and the line negative sequence impedance of the branch at each wind power place are obtained, and the line negative sequence reactance is compared with the square of the line negative sequence impedance. And further, according to the first comparison result, determining the negative sequence voltage adjustment capability of the wind power plants, and adding the negative sequence voltage adjustment capability of each wind power plant to obtain the total negative sequence voltage adjustment capability corresponding to the wind power plants. Further, when an asymmetric short circuit fault occurs in the public transmission line, detecting the negative sequence voltage of the fault point and the positive sequence voltage of the grid-connected point, and comparing the negative sequence voltage of the fault point with the total negative sequence voltage regulation capability. And calculating a negative sequence current instruction value corresponding to each wind power plant according to the second comparison result. And finally, according to the negative sequence current instruction value, reducing the negative sequence voltage of the common connection point in the wind power grid connection. According to the embodiment of the application, the current instruction required to be output by each electric field can be calculated according to the capacity, the fault position, the fault degree and the running working condition of the wind power field, the multi-target voltage control of the wind power system is realized through the current instruction, and the fault crossing capacity of the electric power system with multiple wind power fields is improved.
The invention has the following effects:
The effectiveness of the proposed method is illustrated by taking a three-parallel wind power system as an example. Fig. 5 to 16 show that an asymmetric symmetrical short circuit occurs in the public line of the power grid, the positive sequence voltage of the power grid drops to 0.7p.u., and the negative sequence voltage rises to 0.3p.u. The three wind power plants respectively inject positive sequence d-axis components of 0.292p.u., 0.204p.u., 0.233p.u., positive sequence q-axis components of-0.137 p.u., 0.099p.u., 0.233p.u., negative sequence d-axis components of-0.042p.u., 0.029p.u., 0.034p.u., negative sequence q-axis components of-0.776p.u., 0.543p.u., and 0.621p.u., and three parallel wind power plant simulation waveform diagrams at high wind speeds. By adopting the asymmetric short-circuit fault ride-through control method for the multiple wind power plants, the respective output current values of the three parallel wind power plants under the working condition can be calculated, and the wind power plants can be further controlled. The wind power plant can meet the technical specification of wind power access power systems, and the negative sequence voltage of the public connection point is reduced to 0. The output active power of the three wind power plants is respectively 0.235p.u., 0.160p.u., and 0.185p.u., and the active power limit is smaller than the maximum wind energy tracking power under the working condition, so that grid-connected guide requirements and common point negative sequence voltage inhibition control are preferably met, and the residual capacity is used for outputting the active power. Wherein, FIG. 5 is a fault point voltage; FIG. 6 is a grid side voltage for wind farm No. 1; FIG. 7 is a negative sequence current dq axis component of wind farm No. 1 output oriented with a fault point negative sequence voltage; FIG. 8 is a positive sequence current dq axis component of wind farm No. 1 oriented with a grid side positive sequence voltage; FIG. 9 is a grid side voltage for wind farm No. 2; FIG. 10 is a negative sequence current dq axis component of wind farm No. 2 output oriented with a fault point negative sequence voltage; FIG. 11 is a positive sequence current dq axis component of wind farm No. 2 oriented with grid side positive sequence voltages; FIG. 12 is a No. 3 wind farm grid side voltage; FIG. 13 is a negative sequence current dq axis component of wind farm No. 3 output oriented with a fault point negative sequence voltage; FIG. 14 is a positive sequence current dq axis component of wind farm No. 3 output oriented with grid side positive sequence voltages; FIG. 15 is a positive and negative sequence component of PCC voltage; FIG. 16 is a graph of active power output from each wind farm.
Fig. 17-28 show asymmetric short circuits of the grid public line, the grid positive sequence voltage drops to 0.7p.u., and the negative sequence voltage rises to 0.3p.u. The three wind power plants respectively inject positive sequence d-axis components of 0.121p.u., 0.120u., positive sequence q-axis components of-0.299 p.u., 0.191p.u., 0.228p.u., negative sequence d-axis components of-0.042 p.u., 0.029p.u., 0.034p.u., negative sequence q-axis components of-0.776p.u., 0.543p.u., and 0.621p.u., and the three parallel wind power plant simulation waveform diagrams at low wind speeds. By adopting the asymmetric short-circuit fault ride-through control method for the multiple wind power plants, the respective output current values of the three parallel wind power plants under the working condition can be calculated, and the wind power plants can be further controlled. The wind power plant can meet the technical specification of wind power access power systems, and can achieve maximum wind energy tracking while reducing the negative sequence voltage of the public connection point to 0. Wherein, fig. 17 is a fault point voltage; FIG. 18 is a grid side voltage of wind farm No. 1; FIG. 19 is a negative sequence current dq axis component of wind farm No. 1 output oriented with a fault point negative sequence voltage; FIG. 20 is a positive sequence current dq axis component of wind farm No. 1 oriented with grid side positive sequence voltages; FIG. 21 is a grid side voltage of wind farm No. 2; FIG. 22 is a negative sequence current dq axis component of wind farm No. 2 output oriented with a fault point negative sequence voltage; FIG. 23 is a positive sequence current dq axis component of wind farm No. 2 oriented with grid side positive sequence voltages; FIG. 24 is a No. 3 wind farm grid side voltage; FIG. 25 is a negative sequence current dq axis component of wind farm No. 3 output oriented with a fault point negative sequence voltage; FIG. 26 is a positive sequence current dq axis component of wind farm No. 3 output oriented with grid side positive sequence voltages; FIG. 27 is a positive and negative sequence component of PCC voltage; FIG. 28 is a graph of active power output from each wind farm.
It should be noted that, other corresponding descriptions of each functional unit related to the asymmetric fault ride-through control device for a multi-wind farm provided by the embodiment of the present application may refer to corresponding descriptions in fig. 1 to 4, and are not repeated herein.
Based on such understanding, the technical solution of the present application may be embodied in the form of a software product, where the software product to be identified may be stored in a non-volatile storage medium (may be a CD-ROM, a U-disc, a mobile hard disk, etc.), and include several instructions for causing a computer device (may be a personal computer, a server, or a network device, etc.) to execute the method described in the various implementation scenarios of the present application.
To achieve the above object, in an exemplary embodiment, there is also provided a device including a communication bus, a processor, a memory, and a communication interface, and may further include an input-output interface and a display device, wherein communication between the respective functional units may be completed through the bus. The memory stores a computer program and a processor, which is used for executing the program stored in the memory and executing the asymmetrical fault ride-through control method of the multi-wind farm in the embodiment.
Optionally, the physical device may further include a user interface, a network interface, a camera, radio Frequency (RF) circuitry, sensors, audio circuitry, WI-FI modules, and the like. The user interface may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), etc., and the optional user interface may also include a USB interface, a card reader interface, etc. The network interface may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface), etc.
It will be appreciated by those skilled in the art that the structure of the entity device provided in this embodiment is not limited to this entity device, and may include more or fewer components, or may combine certain components, or may be a different arrangement of components.
The storage medium may also include an operating system, a network communication module. The operating system is a program for managing the entity equipment hardware and the software resources to be identified, and supports the operation of the information processing program and other software and/or programs to be identified. The network communication module is used for realizing communication among all components in the storage medium and communication with other hardware and software in the information processing entity equipment.
From the above description of the embodiments, it will be apparent to those skilled in the art that the present application may be implemented by means of software plus necessary general hardware platforms, or may be implemented by hardware.
Those skilled in the art will appreciate that the drawing is merely a schematic illustration of a preferred implementation scenario and that the modules or flows in the drawing are not necessarily required to practice the application.
Those skilled in the art will appreciate that modules in an apparatus in an implementation scenario may be distributed in an apparatus in an implementation scenario according to an implementation scenario description, or that corresponding changes may be located in one or more apparatuses different from the implementation scenario. The modules of the implementation scenario may be combined into one module, or may be further split into a plurality of sub-modules.
The above-mentioned inventive sequence numbers are merely for description and do not represent advantages or disadvantages of the implementation scenario.
The foregoing disclosure is merely illustrative of some embodiments of the application, and the application is not limited thereto, as modifications may be made by those skilled in the art without departing from the scope of the application.
Claims (9)
1. An asymmetric fault ride-through control method for a multi-wind farm is characterized by comprising the following steps:
In wind power grid connection, obtaining the line negative sequence reactance and the line negative sequence impedance of a branch at each wind power place;
Comparing the line negative sequence reactance with the square of the line negative sequence impedance, determining the negative sequence voltage adjustment capability of the wind power plants according to a first comparison result, and adding the negative sequence voltage adjustment capability of each wind power plant to obtain total negative sequence voltage adjustment capability corresponding to a plurality of wind power plants;
When an asymmetric short circuit fault occurs in a public transmission line, detecting a fault point negative sequence voltage and a grid-connected point positive sequence voltage, comparing the fault point negative sequence voltage with the total negative sequence voltage regulation capacity, and calculating a negative sequence current instruction value corresponding to each wind power plant according to a second comparison result;
according to the negative sequence current instruction value, reducing the negative sequence voltage of the common connection point in the wind power grid connection;
The method for determining the negative sequence voltage regulation capability of the wind power plant comprises the steps of:
When the first comparison result indicates that the line negative sequence reactance is smaller than the line negative sequence impedance, taking a preset value as the negative sequence voltage regulation capacity of the corresponding wind power plant, wherein the preset value is 0;
When the first comparison result indicates that the line negative sequence reactance is larger than or equal to the line negative sequence impedance, obtaining the negative sequence current capacity of a converter corresponding to the wind power plant, obtaining the line negative sequence impedance from a fault point on a public transmission line to the public connection point, and calculating the negative sequence voltage regulation capacity of the wind power plant by adopting the following relation;
Wherein, Is the negative sequence voltage regulation capability of the wind farm,Is the negative sequence current capacity of the converters of the wind farm,Is the line negative sequence impedance from the point of failure on the common transmission line to the point of common connection,Is the line negative sequence reactance of the branch at the wind farm,Is the line negative sequence impedance of the branch at the wind farm.
2. The method of claim 1, wherein adding the negative sequence voltage regulation capability of each wind farm to obtain a total negative sequence voltage regulation capability corresponding to a plurality of wind farms comprises:
adding the negative sequence voltage adjustment capability of each wind power plant according to the following relation to obtain total negative sequence voltage adjustment capability corresponding to a plurality of wind power plants;
Wherein, For the total negative sequence voltage regulation capability,Is the negative sequence voltage regulation capability of the nth wind power plant.
3. The method according to claim 1, wherein calculating a negative sequence current command value corresponding to each wind farm according to the second comparison result comprises:
If the fault point negative sequence voltage orientation is adopted, when the second comparison result indicates that the fault point negative sequence voltage is smaller than or equal to the total negative sequence voltage adjustment capability, calculating a negative sequence current instruction value corresponding to each wind power plant by adopting the following relation, wherein the negative sequence current instruction value comprises a d-axis negative sequence current instruction value and a q-axis negative sequence current instruction value;
Wherein, Is the negative sequence current instruction value of the nth wind farm on the d axis,Is the negative sequence current instruction value of the nth wind farm on the q axis,Is the line resistance value from the point of failure on the common transmission line to the point of common connection,Is the line negative sequence reactance value from the fault point to the common connection point on the common transmission line,Is the fault point negative sequence voltage,For the negative sequence voltage regulation capability of the nth wind farm,For the total negative sequence voltage regulation capability,Is the line negative sequence impedance from the point of failure on the common transmission line to the point of common connection.
4. A method according to claim 3, wherein calculating a negative sequence current command value for each wind farm according to the second comparison result comprises:
If the fault point negative sequence voltage orientation is adopted, when the second comparison result indicates that the fault point negative sequence voltage is larger than the total negative sequence voltage adjustment capability, calculating a negative sequence current instruction value corresponding to each wind power plant by adopting the following relation;
Wherein, Is the negative sequence current capacity of the current transformer.
5. The method according to claim 1, wherein calculating a negative sequence current command value corresponding to each wind farm according to the second comparison result further comprises:
If the grid-connected point positive sequence voltage orientation is adopted, when the second comparison result indicates that the fault point negative sequence voltage is smaller than or equal to the total negative sequence voltage adjustment capability, calculating a negative sequence current instruction value corresponding to each wind power plant by adopting the following relation, wherein the negative sequence current instruction value comprises a d-axis negative sequence current instruction value and a q-axis negative sequence current instruction value;
Wherein, Is the negative sequence current instruction value of the nth wind farm on the d axis,Is the negative sequence current instruction value of the nth wind farm on the q axis,Is the positive sequence voltage of the grid connection point.
6. The method according to claim 5, wherein calculating a negative sequence current command value corresponding to each wind farm according to the second comparison result comprises:
If the grid-connected point positive sequence voltage orientation is adopted, when the second comparison result indicates that the fault point negative sequence voltage is larger than the total negative sequence voltage regulation capacity, calculating an active power controllable operation domain by adopting the following relation;
wherein P maxn is the active power controllable operating domain, i maxn is the current capacity of the converter of the wind farm, Is the fault point negative sequence voltage,Is the negative sequence voltage regulation capability of the nth wind farm,Is the total negative sequence voltage regulation capability,Is the line negative sequence impedance from the point of failure on the common transmission line to the point of common connection,The resistance value of a transmission line between the public connection point and the wind power plant n is set;
And acquiring active power output of maximum wind energy tracking, comparing the active power output with the active power controllable operation domain, and calculating a negative sequence current instruction value corresponding to each wind power plant according to a third comparison result.
7. The method of claim 6, wherein calculating a negative sequence current command value for each of the wind farms based on the third comparison result comprises:
When the active power output of the maximum wind energy tracking is larger than the active power controllable operation domain, calculating a negative sequence current instruction value corresponding to each wind power plant by adopting the following relation;
When the active power output of maximum wind energy tracking is smaller than or equal to the active power controllable operation domain, calculating a negative sequence current instruction value corresponding to each wind power plant by adopting the following relation;
。
8. An asymmetric fault ride-through control device for a multi-wind farm, comprising:
The acquisition module is used for acquiring the line negative sequence reactance and the line negative sequence impedance of the branch at each wind power place in wind power grid connection;
The comparison module is used for comparing the line negative sequence reactance with the square of the line negative sequence impedance, and determining the negative sequence voltage regulation capability of the wind power plant according to a first comparison result;
The calculation module is used for adding the negative sequence voltage adjustment capability of each wind power plant to obtain total negative sequence voltage adjustment capability corresponding to a plurality of wind power plants, comparing the detected fault point negative sequence voltage with the total negative sequence voltage adjustment capability, and calculating a negative sequence current instruction value corresponding to each wind power plant according to a second comparison result;
the adjusting module is used for reducing the negative sequence voltage of the common connection point in the wind power grid connection according to the negative sequence current instruction value;
the comparison module is further configured to, when the first comparison result indicates that the line negative sequence reactance is smaller than the line negative sequence impedance, take a preset value as a negative sequence voltage adjustment capability of a corresponding wind power plant, where the preset value is 0, obtain a negative sequence current capacity of a converter of the corresponding wind power plant when the first comparison result indicates that the line negative sequence reactance is greater than or equal to the line negative sequence impedance, and obtain a line negative sequence impedance from a fault point on a common transmission line to the common connection point, calculate the negative sequence voltage adjustment capability of the wind power plant by using the following relation,
Wherein,Is the negative sequence voltage regulation capability of the wind farm,Is the negative sequence current capacity of the converters of the wind farm,Is the line negative sequence impedance from the point of failure on the common transmission line to the point of common connection,Is the line negative sequence reactance of the branch at the wind farm,Is the line negative sequence impedance of the branch at the wind farm.
9. An electronic device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any one of claims 1 to 7 when the computer program is executed.
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| CN115800369A (en) * | 2022-12-01 | 2023-03-14 | 华中科技大学 | Multi-wind-farm negative-sequence current control method and system suitable for flexible direct grid connection |
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| CN113114062A (en) * | 2021-04-27 | 2021-07-13 | 科华数据股份有限公司 | Control method and device of grid-connected converter and grid-connected converter |
| CN116316697A (en) * | 2023-03-29 | 2023-06-23 | 重庆大学 | Dynamic stability enhancement control method of grid-connected converter under weak current network asymmetric short circuit fault |
| CN116632778A (en) * | 2023-06-20 | 2023-08-22 | 重庆大学 | Double-sequence synchronous stable control method for multi-wind power plant system under asymmetric power grid faults |
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| CN115800369A (en) * | 2022-12-01 | 2023-03-14 | 华中科技大学 | Multi-wind-farm negative-sequence current control method and system suitable for flexible direct grid connection |
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