KR102182861B1 - Apparatus and method for automatically injecting wind power generator - Google Patents

Abstract

A wind generator input device and method that diagnoses whether the normal fault section is separated based on the operating status of the grid-connected device connected to the individually driven wind generator after a fault occurs and the current of the current transformer, and inserts the wind generators excluding the fault section into the system. present. The proposed wind power generator input device is a fault section separator that separates the fault section from the internal power grid of the offshore wind farm, a power grid control unit that sequentially operates and starts the wind turbines included in the fault section separated by the fault section separator, and the power grid. It includes a power grid sensing unit that detects the operating state and current of the grid linkage device of the wind turbine started by the control unit, and a suitability determination unit that determines the suitability of the fault section based on the grid linkage device operation state and current detected by the power grid sensing unit. .

Description

Wind power generator input device and method {APPARATUS AND METHOD FOR AUTOMATICALLY INJECTING WIND POWER GENERATOR}

The present invention relates to a wind power generator automatic input device and method, and more particularly, to a wind power generator automatic input device and method for separating a fault section from the internal power grid of an offshore wind farm and inputting (recovering) a healthy wind power generator. will be.

The internal power grid of the offshore wind power complex is composed of multiple sections consisting of several lines, and if a breakdown occurs in the submarine cable connecting the wind power generator, unlike onshore wind power, it is difficult to quickly check the breakdown at the site, so it is difficult to accurately check the breakdown remotely. The technology to identify the failure section is essential.

Accordingly, when a failure occurs in the submarine cable constituting the internal power grid of the offshore wind farm, the failure section is identified using a protection relay or a failure section detection system. At this time, since the offshore wind power generation complex is installed on the sea, it generally takes several months to recover (replace) the faulty section, so it is difficult to immediately identify the location of the fault like an onshore wind power generation complex, and is mainly composed of a loop method. Because it is composed of multiple sections, if only the faulty section is removed, the offshore wind farm can be operated, so it is necessary to identify the faulty section.

However, even if the faulty section is identified, the offshore wind power generation complex may take several days as short as a few months as long as several months depending on the offshore conditions if the fault location is checked, the fault section is removed, and the healthy section (i.e., wind generator) is manually input. There is a problem that it is difficult to secure economic feasibility and reliability of a wind farm.

Korean Patent Publication No. 10-2015-0036895 (Name: Submarine cable fault section search and fault recovery method)

The present invention has been proposed to solve the above-described conventional problem, and after a failure occurs, a failure section by diagnosing whether the normal failure section is separated based on the driving state of the grid connection device connected to the individually driven wind generator and the current of the current transformer. It is an object of the present invention to provide an apparatus and method for automatically inputting wind power generators to ensure the economical efficiency and reliability of offshore wind farms by inputting wind power generators to the system.

In order to achieve the above object, the automatic input device for a wind power generator according to an embodiment of the present invention includes a fault section separating unit for separating a fault section from the internal power grid of an offshore wind farm, and a fault section separated by the fault section separator. The power grid control unit that sequentially starts individual operation of the wind generators, the power grid detection unit that detects the operation status and current of the grid connection device started by the power grid control unit, and the grid connection unit operation state and current detected by the power grid detection unit It includes a suitability determination unit that determines the suitability of the faulty section on the basis of it.

It further includes an accident current detection unit that detects an accident current that occurs when an accident occurs in the internal power grid, and the fault section separation unit detects a fault section based on the fault current detected by the fault current detector, and detects the fault section from the internal power grid. Can be separated. In this case, the failure section separation unit may separate the failure section received from the failure section detection apparatus from the internal power grid.

When the suitability determination unit determines that the faulty section is suitable, the power grid control unit may input the switchgear of the offshore substation of the internal power grid and start the remaining wind generators excluding the wind generators included in the faulty section among the wind generators included in the internal power grid.

The power grid sensing unit may include a PCS sensing unit that detects whether a grid connection device included in the wind turbine is normally started and whether a trip occurs, and a current transformer sensing unit that collects a current of a current transformer installed in the wind generator.

The suitability determination unit determines that the faulty section is suitable if the grid connection device is operating normally and the current is not detected, and if the power grid detection section detects a trip of the grid connection device, the faulty section is determined to be inappropriate, and detects the power grid. If the unit detects the current of the wind power generator, it can be determined that the fault section is inappropriate. At this time, the suitability determination unit may generate an alarm requesting re-detection of the faulty section if it is determined that the faulty section is inappropriate.

In order to achieve the above object, the method of automatically inputting a wind power generator according to an embodiment of the present invention is a method of automatically inputting a wind power generator using an automatic input device for a wind power generator, the step of separating a fault section from the internal power grid of an offshore wind power complex. In the step of sequentially operating and starting the wind turbines included in the faulty section separated in the step of performing the operation, the step of detecting the operating state and current of the grid-connected device of the wind power generator started in the step of starting the individual operation, and the detection step And determining the suitability of the fault section based on the operating state of the grid-connected device and the current.

It further includes the step of detecting a fault current generated when an accident occurs in the internal power grid, and in the separating step, a fault section is detected based on the fault current detected in the step of detecting the fault current, and the detected fault section is transferred from the internal power grid. Can be separated. In this case, in the separating step, the fault section received from the fault section detection apparatus may be separated from the internal power grid.

In the step of determining the suitability, if it is determined that the faulty section is suitable, the step of inserting the switchgear of the offshore substation of the internal power grid and starting the remaining wind power generators excluding the wind power generators included in the fault section among the wind power generators included in the internal power grid. can do.

The sensing step may include detecting whether a grid connection device included in the wind generator is normally started and whether a trip occurs, and sensing a current of a current transformer installed in the wind generator.

In the step of judging suitability, if the grid-connected device operates normally in the sensing step and no current is detected, the fault section is determined to be suitable, and if a trip occurrence of the grid-connected device is detected in the sensing step, the fault section is judged as inappropriate. If the current of the wind power generator is detected in the detecting step, it may be determined that the fault section is inappropriate. In this case, in the step of determining suitability, if it is determined that the fault section is inappropriate, generating an alarm requesting re-detection of the fault section may be further included.

According to the present invention, the wind power generator automatic input device and method have an effect of accurately separating the fault section remotely by determining the suitability of the fault section after separately driving the wind generator after separating the fault section.

In addition, the wind power generator automatic input device and method determine the suitability of the fault section after separating the fault section and then individually driving the wind power generator, thereby quickly inputting (recovering) the wind generators placed in the section other than the fault section to create an offshore wind power generation complex. There is an effect of minimizing power outages caused by accidents in the internal power grid of

In addition, the wind power generator automatic input device and method determine the suitability of the fault section after separating the fault section and then individually driving the wind turbine, thereby removing the fault section considering stability and restoring the remaining wind turbine from a remote location. There is an effect that can secure economy and reliability.

1 is a view for explaining a wind power generator automatic input device according to an embodiment of the present invention.
2 is a view for explaining the configuration of a wind power generator automatic input device according to an embodiment of the present invention.
3 is a view for explaining the power grid detection unit of Figure 2;
4 is a view for explaining the current sensing unit of FIG. 3.
5 is a flowchart illustrating a method of automatically inputting a wind power generator according to an embodiment of the present invention.

Hereinafter, in order to describe in detail enough that a person having ordinary knowledge in the technical field of the present invention can easily implement the technical idea of the present invention, a most preferred embodiment of the present invention will be described with reference to the accompanying drawings. . First of all, in adding reference numerals to elements of each drawing, it should be noted that the same elements have the same numerals as possible even if they are indicated on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the subject matter of the present invention, a detailed description thereof will be omitted.

Hereinafter, a wind turbine generator automatic input device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. 1 is a view for explaining a wind power generator automatic input device according to an embodiment of the present invention, Figure 2 is a view for explaining the configuration of a wind power generator automatic input device according to an embodiment of the present invention, Figure 3 is A diagram for explaining the power grid sensing unit of 2.

Referring to Figure 1, the internal power grid of the offshore wind power generation complex is configured to include a plurality of offshore wind power generators 10, offshore cables 20, offshore substations 30, and ground substations 40. At this time, a branch current transformer (CT-n) and a current transformer (CTn-mL, CTn-mR, etc.) are installed in the internal power grid of the offshore wind farm to collect current data including at least one of current magnitude and current direction.

The wind power generator automatic input device 100 is installed in the above-ground substation 40. The wind power generator automatic input device 100 may be built in the form of a module in the main urban area of the above-ground substation 40 or may be configured as an independent device.

When an accident (breakdown) occurs in the internal power grid of an offshore wind farm and an accident current occurs, the system linkage device (PCS) of the wind power generator 10 is driven to separate the wind power generator 10 from the system. At this time, the switchgear of the offshore substation 30 is secondarily separated from the system by a protection relay.

The wind power generator automatic input device 100 separates the fault section determination device or the fault section determined by itself from the system, and sequentially restarts the wind generators 10 in the fault section one by one.

When the faulty section is normally separated, the system linkage device (PCS) of the wind power generator 10 is normally driven, and the load current is not measured in the current transformer of the wind power generator 10. That is, when a faulty section is incorrectly determined or another section is divided into a faulty section, fault current is instantaneously generated. Accordingly, the grid-connected device is normally driven to separate the wind power generator 10 input within several hundred µs.

However, when the actual failure section and the other section are separated, the system linkage device (PCS) of the wind power generator 10 automatically trips (OPEN) during startup or the current value is measured in the current transformer.

The wind power generator automatic input device 100 generates an alarm requesting re-detection of a fault section when the grid connection device automatically trips or a current value is measured. Accordingly, the fault section detection device or the wind power generator automatic input device 100 re-detects the fault section and repeats the above-described process.

The wind power generator automatic input device 100 starts the switchgear of the offshore substation 30 when the grid connection device is normally driven and the current value is not measured, and then starts all the wind power generators 10.

Through this, the wind power generator automatic input device 100 normally operates the remaining wind power generators 10 except for the wind power generators 10 in the faulty section.

Referring to FIG. 2, the wind power generator automatic input device 100 includes an accident current detection unit 110, a fault section separation unit 120, a power grid control unit 130, a power grid detection unit 140, and a suitability determination unit 150. Consists of including.

The accident current detection unit 110 detects an accident current generated when an accident (breakdown) occurs in the internal power grid of the offshore wind power generation terminal.

The accident current detection unit 110 collects current from a current transformer or a separate current measuring device through optical communication. The accident current detection unit 110 detects from a current transformer installed inside the wind generator 10, a current transformer installed on the offshore cable 20 connected to the breaker 70 connected to the wind generator 10, and a current transformer installed at the starting point of each bus. Collect one current.

The fault current detection unit 110 detects the fault current by comparing the current collected from the current transformer with a preset set value. The fault current detection unit 110 detects the fault current when the current measured by the current transformer satisfies the set value.

The fault section separating unit 120 separates the fault section when a fault current occurs. At this time, the failure section separation unit 120 receives the failure section from the failure section detection device installed in the above-ground substation 40 and separates the fault section from the system. The fault section separation unit 120 may detect a fault section based on the fault current and divide the detected fault section into a system.

When the separation of the fault section is completed in the fault section separation unit 120, the power grid control unit 130 individually starts the wind power generator 10 included in the fault section. The power grid control unit 130 sequentially starts the wind power generator 10 included in the failure section. The power grid controller 130 sequentially starts from the wind generator 10 disposed closest to the point of occurrence of the failure among the wind generators 10 included in the failure section.

The power grid detection unit 140 detects the wind power generator 10 that has been individually operated and started whenever the wind power generator 10 is individually operated by the power grid control unit 130. The power grid detection unit 140 detects the operating state and current of the system linkage device (PCS) of the wind power generator 10. That is, the power grid detection unit 140 detects whether the grid-connected device is normally started and whether a trip occurs. The power grid detection unit 140 detects the current value of the wind power generator 10. The power grid detection unit 140 transmits the sensed grid connection device operating state and current to the suitability determination unit 150.

Referring to FIG. 3, the power grid detection unit 140 detects whether the grid-connected device included in the wind generator 10, which is individually operated, is normally started and whether a trip occurs, and a PCS detection unit 142 and a wind generator 10 ) May include a generator current sensing unit 144 for sensing the current.

The generator current detection unit 144 is a current transformer (TR-CT) disposed under the transformer 60 connected to the wind generator 10 or the left offshore cable 20 of the circuit breaker 70 connected to the wind generator 10 ) And the current measured by the current transformer (CTn-mL, CTn-mR) disposed on the right marine cable 20 are collected. The generator current detection unit 144 senses the collected current as the current of the wind generator 10.

For example, referring to FIG. 4, modules such as an inverter 50, a transformer 60, and a circuit breaker 70 are connected to the offshore wind generators 10 and WT. At this time, a first current transformer CTn-mL, a second current transformer CTn-mR, and a third current transformer TR-CT are installed between the modules connected to the offshore wind generator 10. The first current transformer (CTn-mL) is installed on the left cable below the circuit breaker 70. The second current transformer CTn-mR is installed on the right cable at the bottom of the circuit breaker 70. The third current transformer (TR-CT) is installed under the transformer 60 of the offshore wind generator 10.

The power grid detection unit 140 collects the current measured by the first current transformer CTn-mL and the second current transformer CTn-mR, and senses the current as the current of the wind generator 10. The power grid detection unit 140 may collect the current measured by the third current transformer TR-CT and detect it as the current of the wind power generator 10.

The suitability determination unit 150 determines the suitability of the separated failure section based on the detection result of the power grid detection unit 140. The suitability determination unit 150 determines that the faulty section is suitable if the grid-connected device operates normally and no current is detected. That is, the suitability determination unit 150 determines that the faulty section separation unit 120 normally separates the faulty section.

When a trip occurs or a current is detected in the grid-connected device, the suitability determination unit 150 determines that the separated fault section is inappropriate. Here, when the current sensed by the power grid detector 140 is not zero, the suitability determination unit 150 determines that the current has been detected. The suitability determination unit 150 may determine that the current has been detected when the current detected by the power grid detection unit 140 exceeds a set value.

If the suitability determination unit 150 determines that the faulty section is inadequate, it generates an alarm requesting re-detection of the faulty section. The suitability determination unit 150 transmits the generated alarm to the fault section detection device or the fault section separation section 120 to request a fault section re-detection.

When the suitability determination unit 150 determines that the faulty section is suitable, the power grid control unit 130 inputs the switch of the offshore substation 30. The power grid control unit 130 starts all the wind power generators 10 included in the internal power grid of the offshore wind farm. At this time, the power grid control unit 130 excludes the wind power generator 10 included in the failure section among all the wind power generators 10 included in the internal power grid from starting.

Through this, the wind power generator automatic input device 100 normally operates the remaining wind power generator 10 except for the failure section.

Hereinafter, a method of automatically inputting the wind power generator 10 according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. 5 is a flowchart illustrating a method of automatically inputting the wind power generator 10 according to an embodiment of the present invention.

The wind power generator automatic input device 100 detects an accident current generated when an accident (breakdown) occurs in the internal power grid of an offshore wind farm (S100).

The wind power generator automatic input device 100 collects current from a current transformer or a separate current measuring device through optical communication. The wind power generator automatic input device 100 includes a current transformer installed inside the wind generator 10, a current transformer installed on the offshore cable 20 connected to the breaker 70 connected to the wind power generator 10, a current transformer installed at the starting point of each bus, etc. Collect the sensed current.

The wind power generator automatic input device 100 detects an accident current by comparing a preset set value with a current collected from a current transformer. At this time, the wind power generator automatic input device 100 detects an accident current when the current measured by the current transformer satisfies the set value.

The wind power generator automatic input device 100 separates the fault section from the system (S200). The wind power generator automatic input device 100 receives a fault section from a fault section detection device installed in the ground substation 40, and separates the fault section from the system. The wind power generator automatic input device 100 may self-detect a fault section based on the fault current and divide the detected fault section into a system.

The wind power generator automatic input device 100 individually starts the wind power generator 10 included in the separated failure section (S300). When the separation of the fault section is completed, the wind power generator automatic input device 100 individually starts the wind generator 10 included in the fault section. The wind power generator automatic input device 100 sequentially starts the wind power generator 10 included in the failure section. The wind power generator automatic input device 100 sequentially starts from the wind power generator 10 disposed closest to the point of occurrence of the failure among the wind generators 10 included in the failure section.

The wind power generator automatic input device 100 detects a driving state of the grid-connected device connected to the wind power generator 10 that has been individually operated. At this time, the wind power generator automatic input device 100 detects whether the grid connection device is normally started and whether a trip occurs.

When the grid-connected device operates normally (S400; yes). The wind power generator automatic input device 100 senses the current of the wind power generator 10. At this time, the wind power generator automatic input device 100 senses the current measured by the current transformer connected to the wind power generator 10 that is individually operated.

If the current is not detected in the wind power generator 10 (S500; Yes), the wind power generator automatic input device 100 inputs the switch of the offshore substation 30 (S600). The wind power generator automatic input device 100 determines that the grid connection device normally operates and if no current is detected, the faulty section is normally separated. The wind power generator automatic input device 100 inputs the switchgear of the offshore substation 30 when it is determined that the faulty section is normally separated.

The wind power generator automatic input device 100 starts the wind power generator 10 included in the internal power grid of the offshore wind farm (S700). At this time, the wind power generator automatic input device 100 excludes the wind power generator 10 included in the failure section among all the wind power generators 10 included in the internal power grid from starting.

On the other hand, when a trip occurs in the grid connection device in step S400 or a current is sensed in step S500, the wind power generator automatic input device 100 generates an alarm requesting re-detection of the fault section (S800). Accordingly, the wind power generator automatic input device 100 repeatedly performs steps S200 to S800 described above.

The wind power generator automatic input device 100 determines that the fault section is abnormally separated when a trip occurs in the grid connection device or a current is detected. Accordingly, the wind power generator automatic input device 100 generates an alarm requesting re-detection of the failure section. The wind power generator automatic input device 100 transmits the generated alarm to the fault section detection device to request re-detection of the fault section, and then repeats the above-described process. The wind power generator automatic input device 100 may repeatedly perform the above-described process after re-detecting the fault section based on the fault current.

As described above, the wind power generator automatic input device 100 and method according to an embodiment of the present invention separates the faulty section where the fault has occurred in the offshore wind power generation complex, and then recovers (replaces) the submarine cable in the faulty section before the remaining healthy wind power. The generator 10 is turned on (restored). That is, the wind power generator automatic input device 100 and method are wind generators in contact with the failure section where the failure occurs in a state in which the breaker 70 of the offshore substation 30 connected to the failure point where the failure has occurred and the feeder are separated. If the problem does not occur by sequentially inputting (10), all wind power generators 10 are put in.

The wind power generator automatic input device 100 and method is a system linkage device (PCS) installed in the wind power generator 10 even when the wind generator 10, which is determined to be a normal section, is incorrectly inserted into the fault section by erroneously identifying the fault section. ), since the wind generator 10 is separated from the system within several hundred µs, there is no problem in protecting the entire line.

As described above, the wind power generator automatic input device 100 and method have the effect of accurately separating the fault section remotely by determining the suitability of the fault section after individually driving the wind generator 10 after separating the fault section. have.

In addition, the wind power generator automatic input device 100 and the method determine the suitability of the fault section after separately driving the wind generator 10 after separating the fault section, thereby quickly speeding up the wind generators 10 disposed in sections other than the fault section. It has the effect of minimizing power outages caused by accidents in the internal power grid of offshore wind farms by inputting (recovering) them.

In addition, the wind power generator automatic input device 100 and method determine the suitability of the fault section after separately driving the wind generator 10 after separating the fault section, thereby remotely removing the fault section considering stability and restoring the wind turbine. This has the effect of securing the economy and reliability of offshore wind farms.

Although the preferred embodiments according to the present invention have been described above, various modifications are possible, and those of ordinary skill in the art can make various modifications and modifications without departing from the scope of the claims of the present invention. It is understood that it can be done.

10: wind generator 20: offshore cable
30: offshore substation 40: ground substation
50: inverter 60: transformer
70: circuit breaker 100: wind power generator automatic closing device
110: fault current detection unit 120: fault section separation unit
130: power grid control unit 140: power grid detection unit
142: PCS detection unit 144: generator current detection unit
150: conformity determination unit

Claims (20)

A fault section separating unit for separating the fault section from the internal power grid of the offshore wind farm;
A power grid control unit sequentially operating and starting the wind power generators included in the fault section separated by the fault section separating unit;
A power grid sensing unit that detects an operating state and a current of the grid linkage device of the wind power generator started by the power grid control unit; And
And a suitability determination unit determining suitability of the faulty section based on the operating state and current of the grid connection device detected by the power grid detection unit,
When the suitability determination unit determines that the faulty section is suitable, the power grid control unit inputs the switchgear of the offshore substation of the internal power grid, and the remaining wind power generators excluding the wind power generator included in the fault section among the wind power generators included in the internal power grid Wind power generator automatic input device to start. The method of claim 1,
Wind power generator automatic input device further comprising an accident current detection unit for detecting an accident current generated when an accident occurs in the internal power grid. The method of claim 2,
The fault section separating unit detects the fault section based on the fault current detected by the fault current detection unit, and a wind power generator automatic input device for separating the detected fault section from the internal power grid. The method of claim 1,
The fault section separating unit is a wind power generator automatic input device for separating the fault section received from the fault section detection device from the internal power grid. delete The method of claim 1,
The power grid detection unit,
A PCS sensing unit that detects whether the grid-connected device included in the wind turbine is normally started and whether a trip occurs; And
Wind generator automatic input device comprising a current sensing unit for collecting the current of the current transformer installed in the wind generator. The method of claim 1,
The suitability determination unit is a wind power generator automatic input device that determines that the fault section is suitable when the grid connection device operates normally and no current is detected by the power grid detection unit. The method of claim 1,
The suitability determination unit, when the power grid detection unit detects the occurrence of a trip of the grid connection device, a wind power generator automatic input device that determines that a failure section is inappropriate. The method of claim 1,
The suitability determination unit, when the power grid sensing unit detects the current of the wind power generator, a wind turbine generator automatic input device that determines that a failure section is inappropriate. The method of claim 1,
The suitability determination unit is a wind power generator automatic input device for generating an alarm requesting re-detection of the fault section when it is determined that the fault section is inappropriate. In the wind power generator automatic input method using a wind generator automatic input device,
Separating the fault section from the internal power grid of the offshore wind farm;
Sequentially starting individual operation of the wind power generators included in the failure section separated in the separating step;
Sensing an operating state and current of the grid connection device of the wind power generator started in the step of starting the individual operation; And
Determining suitability of the fault section based on the operating state and current of the grid-connected device detected in the sensing step,
In the step of determining the suitability, if it is determined that the faulty section is suitable, the switchgear of the offshore substation of the internal power grid is input, and among the wind power generators included in the internal power grid, the remaining wind power generators excluding the wind power generator included in the fault section are started. Wind power generator automatic input method further comprising the step of. The method of claim 11,
Automatic input method of the wind power generator further comprising the step of detecting an accident current generated when an accident occurs in the internal power grid. The method of claim 12,
In the separating step, a fault section is detected based on the fault current detected in the step of detecting the fault current, and the detected fault section is separated from the internal power grid. The method of claim 11,
In the separating step, a wind power generator automatic input method for separating the fault section received from the fault section detection device from the internal power grid. delete The method of claim 11,
The detecting step,
Detecting whether a grid-connected device included in the wind turbine is normally started and whether a trip occurs; And
Wind power generator automatic input method comprising the step of sensing the current of the current transformer installed in the wind power generator. The method of claim 11,
In the step of determining the suitability, if the grid-connecting device operates normally and no current is detected in the detecting step, a wind turbine generator automatic input method is determined to be suitable. The method of claim 11,
In the step of determining the suitability, when the occurrence of a trip of the grid-connecting device is detected in the step of detecting, the method of automatically inputting a wind power generator determines that a fault section is inappropriate. The method of claim 11,
In the step of determining the suitability, when the current of the wind generator is sensed in the step of detecting, the method of automatically inputting a wind turbine generator determines that a failure section is inappropriate. The method of claim 11,
In the step of determining the suitability, if the failure section is determined to be inappropriate, generating an alarm requesting re-detection of the failure section.

Images