CN117293931A - Wind field soft direct grid-connected fault ride-through control method, device, equipment and medium - Google Patents
Wind field soft direct grid-connected fault ride-through control method, device, equipment and medium Download PDFInfo
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- CN117293931A CN117293931A CN202311286487.XA CN202311286487A CN117293931A CN 117293931 A CN117293931 A CN 117293931A CN 202311286487 A CN202311286487 A CN 202311286487A CN 117293931 A CN117293931 A CN 117293931A
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000005265 energy consumption Methods 0.000 claims abstract description 71
- 238000012544 monitoring process Methods 0.000 claims abstract description 10
- 230000003068 static effect Effects 0.000 claims abstract description 10
- 230000001360 synchronised effect Effects 0.000 claims abstract description 8
- 238000004590 computer program Methods 0.000 claims description 8
- 239000003990 capacitor Substances 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 7
- 238000011217 control strategy Methods 0.000 description 6
- 230000006870 function Effects 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000003491 array Methods 0.000 description 2
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- 238000009825 accumulation Methods 0.000 description 1
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- 230000033228 biological regulation Effects 0.000 description 1
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Classifications
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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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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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
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
- H02J3/144—Demand-response operation of the power transmission or distribution network
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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
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
Abstract
The invention relates to the technical field of power system fault ride-through, in particular to a wind field soft direct grid-connected fault ride-through control method, device, equipment and medium, which comprise the following steps: monitoring the voltage of a direct current line in real time, and operating the receiving-end converter station as a static synchronous compensator when the receiving-end power grid has short circuit fault and the direct current voltage is within 1pu to a first threshold value; when the direct current voltage exceeds a first threshold value, the voltage at the grid-connected point of the wind field is actively reduced by the transmitting-end converter station according to the severity of the fault, and the wind field enters a low-voltage ride-through mode; when the direct current voltage exceeds a second threshold value, starting a direct current energy consumption device to consume surplus power of the system; when the direct current voltage is recovered below a first threshold value, the voltage at the grid-connected point of the wind field is recovered by the transmitting end converter station, and the direct current energy consumption device is withdrawn from operation; and after detecting that the system fault is cleared, the system resumes normal operation. In the invention, the construction cost of the direct current energy consumption device is reduced while the successful fault crossing is ensured.
Description
Technical Field
The invention relates to the technical field of power system fault ride-through, in particular to a wind field soft direct grid-connected fault ride-through control method, device, equipment and medium.
Background
For a wind field through a flexible direct current grid-connected system, when the alternating current grid side fails to cause voltage drop, the system has the capability of keeping the system to run for a certain time without off-grid according to national standard requirements. However, the reduction of the ac voltage causes a reduction of the output power of the receiving converter station, while the power emitted from the wind farm side is not substantially affected, and overvoltage is generated on the dc line due to the continuous accumulation of surplus power generated by unbalanced power of the receiving end.
And when the fault of the alternating current power grid is not processed, the surplus power of the system is generally discharged by configuring a direct current energy consumption device at a receiving end converter station in engineering. If the direct current energy consumption device is singly considered to realize fault ride through, the capacity of the direct current energy consumption device needs to be selected according to the rated capacity of a direct current system, so that the construction cost and the occupied area of the direct current energy consumption device are greatly increased.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention provides a wind field soft direct grid-connected fault ride-through control method, device, equipment and medium, so that the problems in the background technology are effectively solved.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a wind field soft direct grid-connected fault ride-through control method comprises the following steps:
the method comprises the steps of monitoring direct-current line voltage in real time, and when a short-circuit fault occurs in a receiving-end power grid, and the direct-current voltage is within 1pu to a first threshold value, operating the receiving-end converter station as a static synchronous compensator to provide reactive power support for an alternating-current power grid;
when the direct current voltage exceeds a first threshold value, the voltage at the grid-connected point of the wind field is actively reduced by the transmitting-end converter station according to the severity of the fault, and the wind field enters a low-voltage ride-through mode;
when the direct current voltage exceeds a second threshold value, starting a direct current energy consumption device to consume surplus power of the system;
when the direct current voltage is recovered below a first threshold value, the voltage at the grid-connected point of the wind field is recovered by the transmitting end converter station, and the direct current energy consumption device is withdrawn from operation;
and after detecting that the system fault is cleared, the system resumes normal operation.
Further, the first threshold is 1.02pu.
Further, the second threshold is 1.05pu.
Further, when the voltage at the grid-connected point of the wind field is actively reduced according to the severity of the fault, the lower limit value of the voltage at the grid-connected point of the wind field is more than or equal to 0.2pu.
The invention also comprises a wind field soft direct grid connection fault ride-through control device, which comprises the following steps:
the monitoring unit is used for monitoring the voltage of the direct current line in real time;
the direct current energy consumption device is used for consuming surplus power of the system;
the control unit is used for controlling the receiving-end converter station to operate as a static synchronous compensator when the receiving-end power grid has short circuit fault and the direct-current voltage is within 1pu to a first threshold value, and providing reactive support for the alternating-current power grid;
when the direct current voltage exceeds a first threshold value, the control end converter station actively reduces the voltage at the grid-connected point of the wind field according to the severity of the fault, and the wind field enters a low voltage ride-through mode;
the system is also used for starting the direct current energy consumption device to consume surplus power of the system when the direct current voltage exceeds a second threshold value;
and the control device is also used for controlling the power supply end converter station to recover the voltage at the grid-connected point of the wind field and controlling the direct current energy consumption device to exit operation when the direct current voltage is recovered below the first threshold value.
Further, the direct current energy consumption device is a distributed energy consumption device and comprises a plurality of energy consumption submodules which are connected in series, wherein the plurality of energy consumption submodules respectively comprise an energy consumption resistor, a voltage stabilizing capacitor and a controllable switch, and the controllable switch is used for controlling the input and the cutting of the energy consumption resistor in the energy consumption submodules.
Further, the energy consumption submodule further comprises a bypass switch, wherein the bypass switch is used for being closed when the energy consumption submodule fails, and bypassing the failed energy consumption submodule.
The invention also includes a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, which processor implements the method as described above when executing the computer program.
The invention also includes a storage medium having stored thereon a computer program which, when executed by a processor, implements a method as described above.
The beneficial effects of the invention are as follows: according to the invention, the voltage at the grid-connected point of the wind field is actively reduced when a fault occurs, so that the output power of the wind field side is reduced, and the energy consumption pressure of the direct current energy consumption device is reduced. By combining the direct current energy consumption device and designing a fault ride-through coordination control strategy, the construction cost and the occupied area of the direct current energy consumption device can be obviously reduced while the successful fault ride-through is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings may be obtained according to the drawings without inventive effort to those skilled in the art.
FIG. 1 is a flow chart of the method of example 1;
FIG. 2 is a schematic diagram of the apparatus of example 1;
FIG. 3 is a topology diagram of a wind farm through a soft direct grid system in example 2;
fig. 4 is a structural topology diagram of the distributed dc energy-consuming device in embodiment 2;
fig. 5 is a flowchart of a fault-ride-through control method in embodiment 2;
FIG. 6 (a) is a graph of input and output power of the system in example 2;
FIG. 6 (b) is a graph of DC voltage curve of the system in example 2;
FIG. 6 (c) is a plot of wind farm grid-connected point voltage in example 2;
FIG. 6 (d) is a graph showing the power consumption of the DC power consuming device in example 2;
fig. 7 is a schematic structural diagram of a computer device.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
Example 1:
as shown in fig. 1: a wind field soft direct grid-connected fault ride-through control method comprises the following steps:
the method comprises the steps of monitoring direct-current line voltage in real time, and when a short-circuit fault occurs in a receiving-end power grid, and the direct-current voltage is within 1pu to a first threshold value, operating the receiving-end converter station as a static synchronous compensator to provide reactive power support for an alternating-current power grid;
when the direct current voltage exceeds a first threshold value, the voltage at the grid-connected point of the wind field is actively reduced by the transmitting-end converter station according to the severity of the fault, and the wind field enters a low-voltage ride-through mode;
when the direct current voltage exceeds a second threshold value, starting a direct current energy consumption device to consume surplus power of the system;
when the direct current voltage is recovered below a first threshold value, the voltage at the grid-connected point of the wind field is recovered by the transmitting end converter station, and the direct current energy consumption device is withdrawn from operation;
and after detecting that the system fault is cleared, the system resumes normal operation.
The voltage at the grid-connected point of the wind field is actively reduced when the fault occurs, so that the output power of the wind field side is reduced, and the energy consumption pressure of the direct current energy consumption device is reduced. By combining the direct current energy consumption device and designing a fault ride-through coordination control strategy, the construction cost and the occupied area of the direct current energy consumption device can be obviously reduced while the successful fault ride-through is ensured.
In this embodiment, the first threshold is 1.02pu and the second threshold is 1.05pu.
When the voltage at the grid-connected point of the wind field is actively reduced according to the severity of the fault, the lower limit value of the voltage at the grid-connected point of the wind field is more than or equal to 0.2pu.
As shown in fig. 2, the embodiment further includes a wind farm soft direct grid connection fault ride-through control device, where the method includes:
the monitoring unit is used for monitoring the voltage of the direct current line in real time;
the direct current energy consumption device is used for consuming surplus power of the system;
the control unit is used for controlling the receiving-end converter station to operate as a static synchronous compensator when the receiving-end power grid has short circuit fault and the direct-current voltage is within 1pu to a first threshold value, and providing reactive support for the alternating-current power grid;
when the direct current voltage exceeds a first threshold value, the control end converter station actively reduces the voltage at the grid-connected point of the wind field according to the severity of the fault, and the wind field enters a low voltage ride-through mode;
the system is also used for starting the direct current energy consumption device to consume surplus power of the system when the direct current voltage exceeds a second threshold value;
and the control device is also used for controlling the power supply end converter station to recover the voltage at the grid-connected point of the wind field and controlling the direct current energy consumption device to exit operation when the direct current voltage is recovered below the first threshold value.
In this embodiment, the direct current energy consumption device is a distributed energy consumption device, and includes a plurality of energy consumption submodules connected in series, and the plurality of energy consumption submodules respectively include an energy consumption resistor, a voltage stabilizing capacitor and a controllable switch, where the controllable switch is used for controlling the input and the removal of the energy consumption resistor in the energy consumption submodule.
Preferably, the energy consuming sub-module further comprises a bypass switch for closing when the energy consuming sub-module fails, bypassing the failed energy consuming sub-module.
Example 2:
fig. 3 is a topological diagram of a flexible direct current grid-connected system of offshore wind power provided by the embodiment of the invention.
Referring to fig. 3, after the wind field is converged through the wind field grid-connected point 1, the sending end converter station 2 rectifies alternating current sent by the offshore wind field into direct current, and the direct current cable 3 conveys the electric energy to the receiving end converter station 4, and the electric energy is fed into the alternating current power grid 5 after being subjected to the receiving end converter station. The distributed dc power consumption device 6 is disposed on the dc side of the receiving-end converter station 4.
Fig. 4 is a structural topology diagram of a distributed dc power dissipation device according to an embodiment of the present invention.
Referring to fig. 4, the distributed dc power dissipation device 6 is composed of a series of power dissipation sub-modules SM connected in series, and a power dissipation resistorR i The energy consumption sub-modules are distributed into the sub-modules, and the input and the removal of the energy consumption sub-modules are realized by controlling the on and off of the controllable switch T in each energy consumption sub-module. When the controllable switch T receives the on signal, the current passes through D 2 —T—R i Loop, energy consumption resistorR i Power consumption, energy consumption submodule input, capacitorCDischarging; when the controllable switch T receives the turn-off signal, the controllable switch T and the diode D 1 Withstand reverse voltage, consume energy submodule excision, electric capacityCAnd (5) charging. The bypass switch S is closed when the energy consumption submodule has internal faults, and bypasses the faulty energy consumption submodule.
Fig. 5 is a fault ride-through control strategy of a wind farm through-soft-direct-grid-connected system provided by the embodiment of the invention.
Referring to fig. 5, the control system monitors the dc line voltage in real time, and when the receiving-end power grid has a short circuit fault, the receiving-end converter station operates as a STATCOM (static synchronous compensator) to provide reactive support for the ac power grid when the dc voltage is 1 pu-1.02 pu; when the direct current voltage exceeds 1.02pu, the voltage controller of the transmitting end converter station actively reduces the voltage at the grid-connected point of the wind field according to the severity of the fault, and the wind field enters a low voltage ride through mode; when the direct current voltage exceeds 1.05pu, starting a distributed direct current energy consumption device to consume surplus power of the system; when the direct current voltage is recovered to be below 1.02pu, the voltage at the grid-connected point of the wind field is recovered by the power transmission end converter station, and the direct current energy consumption device is withdrawn from operation; and after the control system detects that the system fault is cleared, the system resumes normal operation. The lower limit value of the grid-connected point voltage of the wind field cannot be lower than 0.2pu, and the parameters of the distributed energy consumption device are calculated according to the voltage adaptability test of the wind field.
The embodiment of the invention adopts a double-end wind field through a flexible direct current grid-connected system, the rated voltage of the system is +/-400 kV, the rated power is 1100 MW, and the wind field model is a permanent magnet direct drive wind field.
According to the grid-connected regulation of wind power in China, when the grid-connected point voltage of a wind power plant drops to 0.2pu, the wind power generation set is ensured to continuously run for 625ms without off-grid. If the voltage drops too much or the low voltage runs too long, the fan can be disconnected, and the system stability is affected. The example reserves a certain margin, and sets the lower limit value of the voltage of the grid-connected point of the wind power plant to be 0.45pu. And (3) performing voltage adaptability test of the wind turbine generator by simulation, setting a three-phase metallic short-circuit fault on the side of an alternating current power grid, measuring that the voltage of a grid-connected point of the wind field is reduced to 0.45pu, measuring that the output power of the wind field is about 550 MW at the moment, and setting the value as the rated power of the distributed direct current energy consumption device when a coordinated crossing control strategy is adopted.
According to the result of the voltage adaptability test of the wind turbine, the rated power of the distributed direct current energy consumption device is set to be 550 MW, and the number of energy consumption submodules is setN10 energy consumption submodules are arranged, and rated power of each energy consumption submodule is 55 MW. The starting threshold of the distributed DC energy dissipation device is set to be 1.05pu, and the closing threshold is set to be 1.02pu.
In order to examine the effectiveness of the fault ride-through coordination control strategy provided by the invention, a three-phase metallic short-circuit fault is arranged on the side of an alternating current power grid in the period of 2.5 and s, the voltage drop on the side of the alternating current power grid is 0pu, and the fault duration is 0.2 s. After the failure occurs, as shown in fig. 6 (a), the system output power rapidly decreases to 0, and surplus power is accumulated to increase the dc voltage, as shown in fig. 6 (b). When the dc voltage is greater than 1.02pu, as shown in fig. 6 (c), the voltage controller of the terminal converter station starts to actively reduce the ac voltage at the grid-connected point of the wind farm from 220 kV to 99 kV (0.45 pu). Since the wind farm side output power is reduced only a limited amount, some surplus power remains unconsumed, resulting in a continued rise in dc voltage. When the dc voltage is greater than 1.05pu, the distributed dc energy consuming device is put into operation, and as shown in fig. 6 (d), the power consumption is about 550 MW, the surplus power of the rest of the system is taken over, and the continuous rise of the dc voltage is suppressed. In the whole fault ride-through process, the direct current voltage is always kept within 1.1pu, and the direct current voltage and the system power fluctuation are small. When the direct current voltage is smaller than 1.02pu, the distributed direct current energy consumption device is withdrawn from operation, the voltage of the grid-connected point of the wind field is recovered to a normal value, and the system completes fault ride-through. By adopting the control strategy, the construction cost and the occupied area of the direct current energy consumption device are obviously reduced while the wind field successfully passes through serious faults through the flexible direct current grid-connected system.
Please refer to fig. 7, which illustrates a schematic structural diagram of a computer device provided in an embodiment of the present application. The embodiment of the present application provides a computer device 400, including: a processor 410 and a memory 420, the memory 420 storing a computer program executable by the processor 410, which when executed by the processor 410 performs the method as described above.
The present embodiment also provides a storage medium 430, on which storage medium 430 a computer program is stored which, when executed by the processor 410, performs a method as above.
The storage medium 430 may be implemented by any type or combination of volatile or nonvolatile Memory devices, such as a static random access Memory (Static Random Access Memory, SRAM), an electrically erasable Programmable Read-Only Memory (Electrically ErasableProgrammable Read-Only Memory, EEPROM), an erasable Programmable Read-Only Memory (Erasable Programmable Read Only Memory, EPROM), a Programmable Read-Only Memory (PROM), a Read-Only Memory (ROM), a magnetic Memory, a flash Memory, a magnetic disk, or an optical disk.
In the description of the present invention, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. The meaning of "a plurality of" is two or more, unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily for the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and further implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like. While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (9)
1. A wind field soft direct grid-connected fault ride-through control method is characterized by comprising the following steps:
the method comprises the steps of monitoring direct-current line voltage in real time, and when a short-circuit fault occurs in a receiving-end power grid, and the direct-current voltage is within 1pu to a first threshold value, operating the receiving-end converter station as a static synchronous compensator to provide reactive power support for an alternating-current power grid;
when the direct current voltage exceeds a first threshold value, the voltage at the grid-connected point of the wind field is actively reduced by the transmitting-end converter station according to the severity of the fault, and the wind field enters a low-voltage ride-through mode;
when the direct current voltage exceeds a second threshold value, starting a direct current energy consumption device to consume surplus power of the system;
when the direct current voltage is recovered below a first threshold value, the voltage at the grid-connected point of the wind field is recovered by the transmitting end converter station, and the direct current energy consumption device is withdrawn from operation;
and after detecting that the system fault is cleared, the system resumes normal operation.
2. The wind farm soft-direct grid-connected fault ride-through control method of claim 1, wherein the first threshold is 1.02pu.
3. The wind farm soft-direct grid-connected fault ride-through control method of claim 1, wherein the second threshold is 1.05pu.
4. The wind farm soft direct grid connection fault ride through control method according to claim 1, wherein when the power transmitting converter station actively reduces the voltage at the wind farm grid connection point according to the severity of the fault, the voltage lower limit value at the wind farm grid connection point is greater than or equal to 0.2pu.
5. A wind farm soft direct grid connection fault ride through control device, characterized in that a method according to any of claims 1 to 4 is used, comprising:
the monitoring unit is used for monitoring the voltage of the direct current line in real time;
the direct current energy consumption device is used for consuming surplus power of the system;
the control unit is used for controlling the receiving-end converter station to operate as a static synchronous compensator when the receiving-end power grid has short circuit fault and the direct-current voltage is within 1pu to a first threshold value, and providing reactive support for the alternating-current power grid;
when the direct current voltage exceeds a first threshold value, the control end converter station actively reduces the voltage at the grid-connected point of the wind field according to the severity of the fault, and the wind field enters a low voltage ride-through mode;
the system is also used for starting the direct current energy consumption device to consume surplus power of the system when the direct current voltage exceeds a second threshold value;
and the control device is also used for controlling the power supply end converter station to recover the voltage at the grid-connected point of the wind field and controlling the direct current energy consumption device to exit operation when the direct current voltage is recovered below the first threshold value.
6. The wind farm soft direct grid-connected fault ride-through control device according to claim 5, wherein the direct current energy consumption device is a distributed energy consumption device and comprises a plurality of energy consumption submodules connected in series, wherein the plurality of energy consumption submodules respectively comprise an energy consumption resistor, a voltage stabilizing capacitor and a controllable switch, and the controllable switch is used for controlling the input and the removal of the energy consumption resistor in the energy consumption submodules.
7. The wind farm soft direct grid connection fault ride-through control device of claim 6, wherein the energy consuming sub-module further comprises a bypass switch for closing when the energy consuming sub-module fails, bypassing the failed energy consuming sub-module.
8. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any of claims 1-4 when executing the computer program.
9. A storage medium having stored thereon a computer program which, when executed by a processor, implements the method of any of claims 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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