CN109962491B

CN109962491B - Fault processing method and fault processing device for converter of wind generating set

Info

Publication number: CN109962491B
Application number: CN201711407436.2A
Authority: CN
Inventors: 李学品; 张涛; 王伟
Original assignee: Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
Current assignee: Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
Priority date: 2017-12-22
Filing date: 2017-12-22
Publication date: 2021-10-15
Anticipated expiration: 2037-12-22
Also published as: CN109962491A

Abstract

The invention provides a fault processing method and a fault processing device for a converter of a wind generating set. The fault processing method comprises the following steps: detecting whether the converter has a fault; when at least one fault of the converter is detected, determining a fault level corresponding to each fault in the at least one fault; determining a highest fault level of all the determined fault levels; and executing fault processing corresponding to the highest fault level. By adopting the fault processing method and the fault processing device for the converter of the wind generating set, different fault processing can be executed by determining different levels of faults of the converter, so that the loss caused by frequent shutdown of the wind generating set due to faults can be avoided.

Description

Fault processing method and fault processing device for converter of wind generating set

Technical Field

The present invention relates to a fault handling method and apparatus, and more particularly, to a fault handling method and a fault handling apparatus for a converter of a wind turbine generator system.

Background

For important components in a wind power plant, the wind power plant is usually directly shut down for safety reasons, etc., in case of a failure. For example, when a converter in the wind generating set breaks down, the wind generating set can be directly stopped, at the moment, a circuit breaker in the wind generating set can be disconnected, and after a maintenance worker maintains and restarts the wind generating set, the wind generating set can normally operate, so that the wind generating set enters a power generation state.

However, the wind turbine generator is generally installed in a place where the environment is relatively severe (for example, in the sea), and therefore, when the wind turbine generator is stopped due to a failure of a component in the wind turbine generator, it is difficult for a maintenance worker to reach the installation place of the wind turbine generator in time to maintain the failure, thereby causing the wind turbine generator to be stopped for a long time. And the long-time stop of the wind generating set can cause great loss to users.

Therefore, the fault handling method of the converter in the wind turbine generator system causes great loss to users.

Disclosure of Invention

An object of an exemplary embodiment of the present invention is to provide a fault handling method and a fault handling apparatus for a converter of a wind turbine generator system. The fault processing method and the fault processing device can execute different fault processing according to different faults, so that loss caused by frequent shutdown of the wind generating set due to faults is avoided.

According to an aspect of an exemplary embodiment of the present invention, there is provided a fault handling method for a converter of a wind turbine generator system, the fault handling method including: detecting whether the converter has a fault; when at least one fault of the converter is detected, determining a fault level corresponding to each fault in the at least one fault; and executing fault processing corresponding to the highest fault level in all the determined fault levels.

Optionally, the fault level corresponding to each fault is determined according to at least one of the following items: the fault comprises a fault level, a fault level and a fault level, wherein the fault level comprises one or more faults, the fault level comprises a current change degree of the converter caused by the fault, a temperature change degree of the converter caused by the fault, a voltage change degree of the converter caused by the fault, and a type of a device in the converter, wherein the fault corresponds to each fault level.

Optionally, the fault classes include a non-fault-tolerant class fault, a normal shutdown class fault, a reduced power operation class fault, a resistance safety mode class fault, and an abnormal prompting class fault, which are sequentially reduced in class.

Optionally, when the highest fault level is a non-fault-tolerant fault, the step of performing fault handling includes: the wind generating set is suddenly stopped; and displaying first fault prompt information corresponding to the fault of the fault-intolerance type.

Optionally, when the highest fault level is a fault-tolerant type fault, the step of performing fault handling includes: the wind generating set is suddenly stopped; displaying first warning prompt information corresponding to fault-tolerant faults; carrying out self-test on a current transformer of a wind generating set, wherein the self-test detects whether the highest fault disappears in a first preset time period, and the highest fault is a fault corresponding to the highest fault level; when the highest fault is determined to be not disappeared through the self-checking, displaying second fault prompt information corresponding to the fault-tolerant fault; and when the highest fault disappears as determined by the self-checking, the wind generating set is restored to a normal operation state, and the first warning prompt message is not displayed any more.

Optionally, when the highest fault level is a normal shutdown fault, the step of performing fault handling includes: displaying second warning prompt information corresponding to the normal shutdown faults; reducing the generated power of the wind generating set according to a first preset mode until the generated power of the wind generating set is reduced to zero; stopping the operation of a machine side sub-converter in the converters; stopping the operation of a grid-side sub-converter in the converter; carrying out self-test on a current transformer of a wind generating set, wherein the self-test detects whether the highest fault disappears in a first preset time period, and the highest fault is a fault corresponding to the highest fault level; when the highest fault is determined to be not disappeared through the self-checking, displaying third fault prompt information corresponding to the normal shutdown fault; and when the fault disappears as determined by the self-checking, the wind generating set is recovered to a normal operation state, and the second warning prompt message is not displayed any more.

Optionally, when the highest fault level is a reduced power operation type fault, the step of performing fault handling includes: determining a predetermined generated power to which the wind generating set needs to be reduced based on a highest fault corresponding to the highest fault level; reducing the generated power of the wind generating set to the preset generated power according to a second preset mode, and displaying the preset generated power and third warning prompt information corresponding to the power-down operation type fault; periodically detecting whether the highest fault disappears according to a first preset period; when the highest fault disappears, increasing the generated power of the wind generating set to the normal generated power according to a third preset mode, and no longer displaying the third warning prompt message; and when the highest fault is detected not to disappear, keeping the generated power of the wind generating set at the preset generated power.

Optionally, when the highest fault level is a resistor safety mode type fault, the step of performing fault handling includes: displaying fourth warning prompt information corresponding to the resistance safety mode type faults, reducing the generated power of the wind generating set according to a first preset mode, and periodically detecting whether the highest fault disappears or not according to a second preset period, wherein the highest fault is a fault corresponding to the highest fault level; when the highest fault disappears in a third preset time period, increasing the generated power of the wind generating set to the normal generated power according to a fourth preset mode; and when the highest fault is detected not to disappear in a third preset time period, the wind generating set is suddenly stopped, and fourth fault prompt information corresponding to the resistor safety mode type fault is displayed.

Optionally, when the highest failure level is an exception prompting type failure, the step of performing failure processing includes: displaying fifth warning prompt information corresponding to the abnormal prompt type fault; periodically detecting whether a highest fault disappears according to a third preset period, wherein the highest fault is a fault corresponding to the highest fault level; when the highest fault disappears, the fifth warning prompt message is not displayed; when it is detected that the highest failure does not disappear, the display of the fifth warning notice information is maintained.

Optionally, the step of detecting whether the converter fails includes: periodically detecting whether the converter is out of order according to a fourth preset period, wherein the step of determining the failure level comprises the following steps: when at least one fault of the converter is detected in one period, in the one period, determining a fault level corresponding to each fault in the at least one fault, wherein the step of determining the highest fault level comprises the following steps: determining a highest fault level of all the determined fault levels within the one period, wherein the step of performing fault handling comprises: and executing fault processing corresponding to the highest fault level from the time when the highest fault level is determined in the period.

Alternatively, if a new fault is detected in the step of detecting whether the converter is faulty in another cycle after the one cycle during the fault handling corresponding to the highest fault class is being performed in the step of performing fault handling, and it is determined that there is a fault having a new highest fault class higher than the highest fault class among the new faults in the step of determining the highest fault class, the fault handling corresponding to the highest fault class is stopped and the fault handling corresponding to the new highest fault class is started in the step of performing fault handling.

According to another aspect of an exemplary embodiment of the present invention, there is provided a fault handling device for a converter of a wind turbine generator system, the fault handling device comprising: a detection unit configured to detect whether the converter has a fault; the fault level determination unit is configured to determine a fault level corresponding to each fault in at least one fault when the detection unit detects that the converter has at least one fault, and determine the highest fault level in all the determined fault levels; a failure processing unit configured to perform failure processing corresponding to the highest failure level.

Optionally, the fault level determining unit determines the fault level corresponding to each fault according to at least one of the following items: the fault comprises a fault level, a fault level and a fault level, wherein the fault level comprises one or more faults, the fault level comprises a current change degree of the converter caused by the fault, a temperature change degree of the converter caused by the fault, a voltage change degree of the converter caused by the fault, and a type of a device in the converter, wherein the fault corresponds to each fault level.

Optionally, the fault handling unit includes at least one of the following fault handling modules, and each fault handling module includes: the first fault processing module is used for making the wind generating set suddenly stop when the highest fault level is a fault which cannot be fault-tolerant; displaying first fault prompt information corresponding to the fault of the fault-intolerance type; the second fault processing module is used for making the wind generating set suddenly stop when the highest fault level is a fault-tolerant fault; displaying first warning prompt information corresponding to fault-tolerant faults; carrying out self-checking on a current transformer of the wind generating set, wherein the self-checking detects whether the highest fault disappears in a first preset time period; when the highest fault is determined to be not disappeared through the self-checking, displaying second fault prompt information corresponding to the fault-tolerant fault; when the highest fault disappears as determined by the self-checking, the wind generating set is recovered to a normal operation state, and the first warning prompt message is not displayed any more; the third fault processing module is used for displaying second warning prompt information corresponding to the normal shutdown fault when the highest fault level is the normal shutdown fault; reducing the generated power of the wind generating set according to a first preset mode until the generated power of the wind generating set is reduced to zero; stopping the operation of a machine side sub-converter in the converters; stopping the operation of a grid-side sub-converter in the converter; carrying out self-checking on a current transformer of the wind generating set, wherein the self-checking detects whether the highest fault disappears in a first preset time period; when the highest fault is determined to be not disappeared through the self-checking, displaying third fault prompt information corresponding to the normal shutdown fault; when the fault disappears, the wind generating set is recovered to a normal operation state, and the second warning prompt message is not displayed; the fourth fault processing module is used for determining the preset generating power to which the wind generating set needs to be reduced based on the highest fault corresponding to the highest fault grade when the highest fault grade is the reduced power operation type fault; reducing the generated power of the wind generating set to the preset generated power according to a second preset mode, and displaying the preset generated power and third warning prompt information corresponding to the power-down operation type fault; periodically detecting whether the highest fault disappears according to a first preset period; when the highest fault disappears, increasing the generated power of the wind generating set to the normal generated power according to a third preset mode, and no longer displaying the third warning prompt message; when the highest fault is detected not to disappear, keeping the generated power of the wind generating set at the preset generated power; the fifth fault processing module is used for displaying fourth warning prompt information corresponding to the resistance safety mode type fault when the highest fault level is the resistance safety mode type fault, reducing the generating power of the wind generating set according to a first preset mode, and periodically detecting whether the highest fault disappears according to a second preset period, wherein the highest fault is the fault corresponding to the highest fault level; when the highest fault disappears in a third preset time period, increasing the generated power of the wind generating set to the normal generated power according to a fourth preset mode; when the highest fault is detected not to disappear in a third preset time period, the wind generating set is suddenly stopped, and fourth fault prompt information corresponding to the resistor safety mode type fault is displayed; the sixth fault processing module is used for displaying fifth warning prompt information corresponding to the abnormal prompt type fault when the highest fault level is the abnormal prompt type fault; periodically detecting whether the highest fault disappears according to a third preset period; when the highest fault disappears, the fifth warning prompt message is not displayed; when the highest fault is detected not to disappear, keeping the display of the fifth warning prompt message; wherein the highest fault is a fault corresponding to the highest fault level.

According to another aspect of exemplary embodiments of the present invention, a computer-readable storage medium is provided, in which a computer program is stored, which, when being executed by a processor, implements the above-mentioned method of fault handling of a converter of a wind park.

According to another aspect of an exemplary embodiment of the present invention, there is provided a control system of a wind turbine generator system, characterized in that the control system includes: a processor; and the memory stores a computer program, and when the computer program is executed by the processor, the fault handling method of the converter of the wind generating set is realized.

By adopting the fault processing method and the fault processing device for the converter of the wind generating set, different fault processing can be executed by determining different levels of faults of the converter, so that the loss caused by frequent shutdown of the wind generating set due to faults can be avoided.

Drawings

The above and other objects and features of exemplary embodiments of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings which illustrate exemplary embodiments, wherein:

fig. 1 shows a flow chart of a method of fault handling of a converter of a wind park according to an embodiment of the invention;

fig. 2 shows a flow chart of the fault handling steps performed in the fault handling method of a converter of a wind park according to an embodiment of the invention;

fig. 3 shows a flow chart of the fault handling steps performed in the fault handling method of a converter of a wind park according to another embodiment of the invention;

fig. 4 shows a flow chart of the fault handling steps performed in the fault handling method of a converter of a wind park according to another embodiment of the invention;

fig. 5 shows a flow chart of the fault handling steps performed in a fault handling method of a converter of a wind park according to another embodiment of the invention;

fig. 6 shows a flow chart of the fault handling steps performed in a fault handling method of a converter of a wind park according to another embodiment of the invention;

fig. 7 shows a flow chart of the fault handling steps performed in a fault handling method of a converter of a wind park according to another embodiment of the invention;

fig. 8 shows a block diagram of a fault handling arrangement of a converter of a wind park according to an embodiment of the invention.

Detailed Description

Exemplary embodiments of the present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments are shown. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the example 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 exemplary embodiments to those skilled in the art.

Fig. 1 shows a flow chart of a method for fault handling of a converter of a wind park according to an embodiment of the invention.

Referring to fig. 1, in S100, it is detected whether the converter has a fault. Here, it may be detected in any way whether a converter of the wind turbine generator system is out of order.

When at least one fault of the converter is detected in S100, executing S200: and determining a fault grade corresponding to each fault in the at least one fault. Here, one or more faults may be detected in S100, and when one or more faults are detected, a fault level corresponding to each fault may be determined in S200. As an example, the faults corresponding to each fault level may include one or more faults.

Here, the failure level may indicate the severity of the failure. As an example, the failure levels may include a non-fault-tolerant type failure, a normal shutdown type failure, a reduced power operation type failure, a resistive safe mode type failure, and an abnormal alert type failure with sequentially decreasing levels.

The failure level to which a failure belongs may be determined based on a variety of factors. As an example, the failure level corresponding to each failure may be determined according to at least one of: the degree of current change of the converter caused by the fault, the degree of temperature change of the converter caused by the fault, the degree of voltage change of the converter caused by the fault, and the type of device in the converter in which the fault occurs.

Here, the converter of the wind turbine generator system includes a machine side sub-converter, a grid side sub-converter, and a busbar connecting the machine side sub-converter and the grid side sub-converter. The current (voltage) input to the machine-side sub-converter and the current (voltage) output from the grid-side sub-converter are both three-phase currents (voltages), and the current (voltage) in the busbar is a direct current (voltage). The fault may cause abnormality in the current (voltage) input into the machine-side sub-converter and/or the current (voltage) output from the grid-side sub-converter. Thus, as an example, the fault level may be determined according to the degree of current change of the converter caused by the fault and/or the degree of voltage change of the converter caused by the fault.

For example, when the current value (voltage value) of any phase current (voltage) input into the machine-side sub-converter or any phase current (voltage) output from the grid-side sub-converter is too high (for example, higher than a predetermined threshold current (voltage)), it indicates that there is a significant safety risk due to a significant abnormality in the power generation of the wind turbine generator system, and at this time, such a fault that causes an excessive change in the current (voltage) of the converter can be classified as a fault-tolerant type fault with a high level. However, in the following example, when the current (voltage) difference between any two phases of the three-phase currents (voltages) of the machine-side sub-converter or the grid-side sub-converter is too large (for example, larger than a predetermined difference), although the power generation of the wind turbine generator system is obviously abnormal, there is usually no significant safety hazard, and thus, the fault with the too large current (voltage) difference can be classified as a normal shutdown fault of a lower level.

In addition, a machine side sub-converter, a grid side sub-converter and a detection unit (which may be referred to as an automatic unit) of the converters may detect a dc voltage of the busbar, and in one example, when a difference between voltages detected by the three is large (for example, greater than a predetermined threshold difference), the fault may be classified as a normal shutdown fault.

As another example, the fault level may be determined by considering the type of device in the converter in which the fault occurred. For example, when important devices in the converter fail, the failure can be classified as the highest-grade fault-intolerant type failure. For example, when a Direct Current (DC) or Alternating Current (AC) fast capacitor in the converter fails, the fault class can be classified as the fault class with the highest fault-intolerance class. When some of the less important components (e.g., lightning protection modules) in the converter fail, the failure may be classified as a normal shutdown type failure. When other less important devices (e.g., some sensing elements) in the converter fail, the failure can be classified as a reduced power operation type failure or an abnormal indication type failure according to whether other sensing elements capable of replacing the sensing elements are arranged in the converter. When a grid-side device of the converter fails, the fault can be classified as a resistive safety mode type fault.

As still another example, the fault level corresponding to the fault may be determined by comprehensively considering the degree of current change of the converter caused by the fault, the degree of temperature change of the converter caused by the fault, and the type of the device in the converter where the fault occurs. For example, when a drive board, which is an important component in the converter, has a fault and the fault includes an over-temperature fault, the fault may be classified as a fault of a higher-level fault-tolerant type. When a driving plate in the converter fails and the faults include overcurrent faults, the faults can be classified into the fault of the highest grade which cannot be fault-tolerant.

It should be understood that the above manner for determining the fault level corresponding to the fault is only an example, and in practical applications, the fault level corresponding to the fault may be determined by combining different factors in different manners according to actual situations.

As an example, after the correspondence relationship between the fault and the fault level is set, the correspondence relationship between the fault and the fault level may be stored, so that in S200, the fault level corresponding to the detected at least one fault may be determined according to the stored correspondence relationship between the fault and the fault level.

At S300, the highest fault level of all fault levels determined at S200 is determined. Here, after determining a fault level corresponding to each fault occurring in the converter of the wind turbine generator system in S200, a highest fault level having a highest level may be detected in S300.

At S400, the failure process corresponding to the highest failure level is executed. Here, different fault levels may correspond to different fault processes, and performing a fault process corresponding to the highest fault level determined in S300 may maximally secure the safety of the wind turbine generator set and the like.

Described below with reference to fig. 2, an embodiment of performing failure processing in S400 when the highest failure level determined in S300 of fig. 1 is a non-fault-tolerant type failure.

Fig. 2 shows a flow chart of the fault handling steps performed in the fault handling method of a converter of a wind park according to an embodiment of the invention.

Referring to fig. 2, at S411, the wind turbine generator set may be abruptly stopped. Here, the emergency stop of the wind turbine generator system means an emergency stop of the wind turbine generator system. Specifically, as an example, the emergency stop of the wind turbine generator system refers to opening a circuit breaker of the wind turbine generator system, bringing a machine-side sub-converter and a grid-side sub-converter in a converter of the wind turbine generator system into a pulse-blocking state, and feathering blades of the wind turbine generator system. Here, to open the circuit breaker of the wind turbine generator system means to open the grid-side circuit breaker and the machine-side circuit breaker of the wind turbine generator system at the same time.

At S412, a first fault notification corresponding to the non-fault tolerant type fault may be displayed.

Here, since the determined highest fault level is the highest fault of the non-fault-tolerant class, the wind turbine generator system may be directly brought to an emergency stop and fault notification information, that is, first fault notification information corresponding to the fault of the non-fault-tolerant class is displayed to a user.

Described below with reference to fig. 3, an embodiment of fault handling is performed in S400 when the highest fault level determined in S300 of fig. 1 is a fault-tolerant type fault.

Fig. 3 shows a flow chart of the steps performed in the fault handling method of the converter of the wind park according to another embodiment of the invention.

Referring to fig. 3, at S421, the wind turbine generator system may be brought to an emergency stop. Here, since the highest fault level is a fault-tolerant type fault with a higher level, the wind turbine generator set may be brought to an emergency stop first.

At S422, a first warning alert corresponding to a fault-tolerant type of fault may be displayed. Here, a warning prompt message, that is, a first warning prompt message corresponding to a fault-tolerant type fault may be displayed to a user while the wind turbine generator set is brought to an emergency stop. Here, the warning notice information is different from the failure notice information in that: the warning prompt message is used for prompting a user that the converter has a fault but the fault possibly disappears, and the fault prompt message is used for prompting the user that the converter has an irrevocable fault and needs to be maintained by maintenance personnel.

At S423, a self-test may be performed on the current transformer of the wind turbine generator system. The self-test detects whether the highest fault disappears in a first preset time period, wherein the highest fault is a fault corresponding to the highest fault level.

For example, whether or not the highest fault corresponding to the fault of the non-fault-tolerant type disappears may be detected within several seconds from the time when the first warning notice information starts to be displayed. It should be understood that the length of the first predetermined period of time may be set according to actual circumstances.

When it is determined by the self-test that the highest fault is not disappeared in S423, S424: and displaying second fault prompt information corresponding to the fault-tolerant type fault. Here, when it is determined that the fault does not disappear within the first predetermined period of time, the fault may be considered to be a continuously existing fault, and at this time, instead of displaying the warning notice (i.e., the first warning notice) in S424, the fault notice, i.e., the second fault notice corresponding to the fault-tolerant type fault, may be displayed to the user. Here, the second failure indication information may be different from the first failure indication information in the embodiment of fig. 2.

When it is determined by the self-test that the highest fault disappears in S423, S425 may be performed: and enabling the wind generating set to recover the normal operation state, and not displaying the first warning prompt message any more. Here, when it is determined that the fault disappears within the first predetermined period of time, it may be determined that the fault no longer exists, at which point the wind turbine generator set may be restored to the normal operation state without displaying the warning notice (i.e., the first warning notice).

Further, in another embodiment, before performing the self-test of S423, it may be further determined whether the self-test has been performed a predetermined number of times within a second predetermined period of time. And when determining that the self-checking is performed for the predetermined number of times within the second predetermined time period, the step of stopping the wind turbine generator set suddenly without performing the self-checking; when it is determined that the self-test has not been performed the predetermined number of times within the second predetermined period of time, the step of self-testing may be performed.

Here, the second predetermined period of time may be much longer than the first predetermined period of time. For example, the number of times that self-checking corresponding to fault-tolerant type faults is performed within one day may be determined, and when the number of times that self-checking is performed reaches a predetermined number, the fault-tolerant type faults may be considered to occur too frequently, and at this time, the wind turbine generator system may be brought to an emergency stop without performing the self-checking; and when the self-checking times are not reached to the preset times, executing the self-checking step of fault-tolerant faults.

Described below with reference to fig. 4, an embodiment of performing failure processing in S400 when the highest failure level determined in S300 of fig. 1 is a normal shutdown type failure.

Fig. 4 shows a flow chart of the steps performed in the fault handling method of the converter of the wind park according to another embodiment of the invention.

Referring to fig. 4, at S431, a second warning notice corresponding to the normal shutdown type malfunction may be displayed. Here, the second warning notice information may be different from the first warning notice information in the embodiment of fig. 3.

At S432, the generated power of the wind generating set is reduced according to a first preset mode until the generated power of the wind generating set is reduced to zero.

Here, the reduction of the generated power of the wind turbine generator set in the first predetermined manner may be started when the display of the second warning notice information is started. For example, the generated power of the wind turbine generator set may be reduced to zero according to a predetermined generated power reduction curve. For example, the curve may be a curve indicating a change in the magnitude of the generated electric power with time.

In S433, the operation of the machine side sub-converter of the converters is stopped.

At S434, the grid-side sub-converters in the converter are stopped from operating.

The converter of the wind generating set comprises a machine side sub-converter and a grid side sub-converter, and in order to ensure safety, the machine side sub-converter can be stopped firstly, and then the grid side sub-converter can be stopped.

At S435, performing self-test on the converter, wherein the self-test detects whether a highest fault disappears within a first predetermined time period, and the highest fault is a fault corresponding to the highest fault level. Here, similarly to S423 in the embodiment of fig. 3, for example, it may be detected whether or not the highest fault corresponding to the normal shutdown type fault disappears within several seconds from the time when the second warning notice information starts to be displayed. And the length of the first predetermined period of time may be set according to the actual situation.

When it is determined by the self-test that the highest fault is not disappeared in S435, S436 may be performed: and displaying third fault prompt information corresponding to the normal shutdown fault. At the moment, the circuit breaker of the wind generating set is not opened. Here, when it is determined that the fault does not disappear within the first predetermined period of time, the fault may be considered to be a continuously existing fault, and at this time, the fault indication information, that is, the third fault indication information corresponding to the normal shutdown type fault may be displayed to the user instead of the warning indication information (that is, the second warning indication information) in S436. Here, the third failure indication information may be different from the first failure indication information in the embodiment of fig. 2 and the second failure indication information in the embodiment of fig. 3.

When it is determined by the self-test that the highest fault disappears in S435, S437 may be performed: and enabling the wind generating set to recover the normal operation state, and not displaying the second warning prompt message any more. Here, when it is determined that the fault disappears within the first predetermined period of time, it may be determined that the fault no longer exists, at which point the wind turbine generator set may be restored to the normal operation state without displaying the warning notice (i.e., the second warning notice). For example, the wind turbine generator system can be restored to a normal operation state according to the following steps: and the grid side sub-converter in the converter is operated, the machine side sub-converter in the converter is operated, and the generated power of the wind generating set is increased to normal generated power.

Further, in another embodiment, before performing the self-test in S435, it may be further determined whether the self-test has been performed a predetermined number of times within a second predetermined time period. And when it is determined that the self-checking is performed for the predetermined number of times within the second predetermined period of time, the wind turbine generator system may be maintained in a state where the generated power is zero and the machine side sub-converter and the grid side sub-converter in the converter are stopped from operating, without performing the step of the self-checking; when it is determined that the self-test has not been performed the predetermined number of times within the second predetermined period of time, the step of self-testing may be performed.

Here, the second predetermined period of time may be much longer than the first predetermined period of time. For example, the number of times of performing self-checking corresponding to a normal shutdown fault within one day may be determined, and when the number of times of performing self-checking reaches a predetermined number of times, it may be considered that the normal shutdown fault occurs too frequently, and at this time, the wind turbine generator system may maintain a state in which the generated power is zero and the machine side sub-converter and the grid side sub-converter in the converter stop operating, and the self-checking is not performed any more; and when the times of executing the self-checking does not reach the preset times, executing the self-checking of the normal shutdown fault.

Described below with reference to fig. 5, an embodiment of performing fault handling in S400 when the highest fault level determined in S300 of fig. 1 is a reduced power operation class fault.

Fig. 5 shows a flow chart of the steps performed in the fault handling method of a converter of a wind park according to another embodiment of the invention.

Referring to fig. 5, at S441, a predetermined generated power to which the wind park needs to be reduced may be determined based on the highest fault corresponding to the highest fault level.

Here, the highest-level fault is a power-down operation-type fault, and there may be a plurality of specific faults corresponding to the power-down operation-type fault. Thus, the predetermined generated power to which the wind park needs to be reduced may be determined in relation to the specific fault.

For example, when the highest fault corresponding to the derated operation-type fault is a device over-temperature-type fault, for example, when the device temperature is higher than the rated temperature by a predetermined value (e.g., by 5 degrees celsius), it may be determined that the wind turbine generator set needs to be derated to 90% of the normal power generation. When the highest fault corresponding to the derated operation-type fault is a device overcurrent-type fault, for example, when the device current is higher than the rated current by a predetermined ratio (for example, by 5%), it may be determined that the wind turbine generator set needs to be derated to 80% of the normal generated power. When the fault corresponding to the reduced power operation type fault is a device damage, it may be determined that the wind turbine generator set needs to be reduced to 95% of the normal generation power, and the device may be deactivated.

It should be appreciated that the predetermined generated power to which the wind park needs to be reduced, determined above according to the specific fault type corresponding to the reduced power operation type fault, is merely an example. Different corresponding relations between the specific fault and the preset generated power can be set according to actual conditions.

At S442, the generated power of the wind turbine generator set may be reduced to the predetermined generated power in a second predetermined manner, and the predetermined generated power and a third warning notice corresponding to the reduced power operation type fault are displayed. Here, the third warning notice information may be different from the first warning notice information in the embodiment of fig. 3 and the second warning notice information in the embodiment of fig. 4.

Since the reduced-power operation-type fault is lower in level than the normal stop-type fault, for example, the generated power of the wind turbine generator set may be reduced according to another generated power reduction curve that is gentler than the generated power reduction curve for reducing the generated power of the wind turbine generator set in fig. 4. For example, the other generated power reduction curve may be a curve indicating a change in the magnitude of the generated power with time.

At S443, it is periodically detected whether the highest fault disappears at a first predetermined period. For example, it may be periodically detected whether the fault corresponding to the power-down operation-type fault disappears according to a first predetermined period during the process of reducing the generated power of the wind turbine generator set in the second predetermined manner and after the generated power of the wind turbine generator set is reduced to the predetermined generated power. Here, the length of the first predetermined period may be set according to actual circumstances.

When the highest fault disappears is detected at S443, S444 may be performed: and increasing the generated power of the wind generating set to the normal generated power according to a third preset mode, and no longer displaying the third warning prompt message.

Here, when the highest fault is detected to disappear during the process of reducing the generated power of the wind turbine generator set in the second predetermined manner or after reducing the generated power of the wind turbine generator set to the predetermined generated power, it is interpreted that the fault no longer exists, and thus the generated power of the wind turbine generator set may be increased to the normal generated power in the third predetermined manner. For example, the generated power of the wind turbine generator set may be increased to the normal generated power in accordance with a power increase curve having the same degree of gentleness as the other power decrease curve described above. At this time, the third warning message may not be displayed because the failure disappears.

When it is detected at S443 that the highest fault is not disappeared, S445 may be performed: and keeping the generated power of the wind generating set at the preset generated power. Here, when it is determined through the periodic detection that the fault corresponding to the power down operation type fault has been present, the predetermined generated power may be maintained, and the display of the third warning notice information may be maintained.

Described below with reference to fig. 6, an embodiment of performing a fault process in S400 when the highest fault level determined in S300 of fig. 1 is a resistive safety mode-like fault.

Fig. 6 shows a flow chart of the steps performed in the fault handling method of the converter of the wind park according to another embodiment of the invention.

Referring to fig. 6, at S451, fourth warning information corresponding to the resistance safety mode-like failure is displayed, and the generated power of the wind turbine generator system is reduced in a first predetermined manner. Here, the fourth warning notice information may be different from the first warning notice information in the embodiment of fig. 3, the second warning notice information in the embodiment of fig. 4, and the third warning notice information in the embodiment of fig. 5.

For example, the generated power of the wind power generator may start to be reduced according to the generated power reduction curve corresponding to the first predetermined manner in the embodiment of fig. 4 when the fourth warning notice information starts to be displayed.

At S452, it may be periodically detected whether a highest fault disappears according to a second predetermined period, wherein the highest fault is a fault corresponding to the highest fault level.

For example, whether or not the highest failure disappears may be periodically detected at a second predetermined cycle within a third predetermined period of time from the time when the fourth warning notice information starts to be displayed. For example, the length of the third predetermined period of time may be 3 seconds, and it should be understood that the length of the third predetermined period of time may be set to different values according to actual circumstances.

When the highest failure disappearance is detected within the third predetermined period of time in S452, S453 may be performed: and increasing the generated power of the wind generating set to the normal generated power according to a fourth preset mode. Here, the generated power of the wind turbine generator set may be increased to the normal generated power according to a power increase curve having the same degree of gentleness as the above-described power decrease curve. At this time, the fourth warning message may not be displayed because the failure disappears.

When it is detected in S452 that the highest fault is not disappeared within the third predetermined period of time, S454 may be performed: and (4) stopping the wind generating set suddenly, and displaying fourth fault prompt information corresponding to the resistor safety mode type fault. Here, the fourth failure indication information may be different from the first failure indication information in the embodiment of fig. 2, the second failure indication information in the embodiment of fig. 3, and the third failure indication information in the embodiment of fig. 4. Here, as long as the failure does not disappear, the failure may be periodically detected at the second predetermined period all the time, and the fourth warning notice information may be continuously displayed.

Described below with reference to fig. 7, an embodiment of performing failure processing in S400 when the highest failure level determined in S300 of fig. 1 is an abnormality presentation-type failure.

Fig. 7 shows a flow chart of the steps performed in the fault handling method of the converter of the wind park according to another embodiment of the invention.

Referring to fig. 7, at S461, fifth warning notice information corresponding to the abnormality notice type malfunction may be displayed. Here, the fifth warning notice information may be different from the first warning notice information in the embodiment of fig. 3, the second warning notice information in the embodiment of fig. 4, the third warning notice information in the embodiment of fig. 5, and the fourth warning notice information in the embodiment of fig. 6.

At S462, it may be periodically detected whether a highest fault disappears at a third predetermined period, wherein the highest fault is a fault corresponding to the highest fault level.

Here, whether or not the failure corresponding to the abnormality indication type failure disappears may be periodically detected at a third predetermined period while the fifth warning indication information is displayed. Here, the length of the third predetermined period may be set according to actual circumstances.

When the highest fault disappears is detected at S462, S463 may be performed: the fifth warning notice information is no longer displayed. Here, when it is detected that the highest failure disappears, since the failure no longer exists, the warning notice (for example, fifth warning notice) may not be displayed any more.

When it is detected at S462 that the highest fault has not disappeared, S464: display of the fifth warning notice information is maintained. Here, as long as the failure does not disappear, the failure may be periodically detected at the third predetermined period all the time, and the fifth warning notice information may be continuously displayed.

In this embodiment, the generated power of the wind turbine generator system can be maintained as the normal generated power.

Referring back to fig. 1, in another embodiment, in order to timely find a fault of a converter of a wind park, the fault of the converter of the wind park may be periodically detected. As an example, whether the converter is out of order may be periodically detected at a fourth predetermined period in S100. Here, the length of the fourth predetermined period may be set according to actual circumstances.

In this case, when at least one fault of the converter is detected within one period in S100, a fault level corresponding to each fault of the at least one fault may be determined within the one period in S200. And, in S300, the highest fault level among all the determined fault levels may be determined within the one period. In S400, from the time when the highest failure level is determined in the one cycle, failure processing corresponding to the highest failure level is performed.

In this case, in order to ensure that the failure process performed in S400 is always the failure process corresponding to the highest failure rank determined in S300, as an example, if a new failure is detected in S100 in another cycle after the one cycle during the failure process corresponding to the highest failure rank is being performed in S400, and it is determined in S300 that there is a failure having a new highest failure rank higher than the highest failure rank among the new failures, the failure process corresponding to the highest failure rank may be stopped in S400 and the failure process corresponding to the new highest failure rank may be started to be performed.

Here, the fourth period is a detection period for detecting a fault of the converter, and the detected period may be an integer multiple of the fourth period for each specific fault. For example, when the detection period of the converter is 1 second, the first fault may be periodically detected at a period of 1 second, the second fault may be detected at a period of 2 seconds (2 times the fourth period), the third fault may be detected at a period of 4 seconds (4 times the first period), and so on. Therefore, a plurality of faults may be detected within a certain detection period (for example, a period corresponding to the 4 th second).

It should be understood that the length of the fourth period and the period for which the specific fault is checked are only examples, and the fourth period and the period for which the specific fault is detected may be set according to actual situations. For example, the cycle in which each fault is detected may be set to the fourth cycle, in which case all faults are detected in every fourth cycle.

By adopting the fault processing method of the converter of the wind generating set, different fault processing can be executed by determining different levels of the fault of the converter, so that the loss caused by frequent shutdown of the wind generating set due to the fault can be avoided.

Referring to fig. 8, the fault handling apparatus of a converter of a wind turbine generator set according to an exemplary embodiment of the present invention includes: a detection unit 100, a fault level determination unit 200 and a fault handling unit 300.

The detection unit 100 is configured to detect whether the converter is malfunctioning. Here, the detection unit 100 may detect whether a converter of the wind turbine generator system is out of order in any way.

The fault level determination unit 200 is configured to determine a fault level corresponding to each fault in at least one fault when the detection unit 100 detects that at least one fault occurs in the converter, and determine a highest fault level in all the determined fault levels. Here, the detection unit 100 may detect one or more faults, and when one or more faults are detected, the fault level determination unit 200 may determine a fault level corresponding to each fault. As an example, the faults corresponding to each fault level may include one or more faults.

The fault level determination unit 200 may determine a fault level to which the fault belongs according to various factors. As an example, the fault level determination unit 200 may determine the fault level corresponding to each fault according to at least one of the following: the degree of current change of the converter caused by the fault, the degree of temperature change of the converter caused by the fault, the degree of voltage change of the converter caused by the fault, and the type of device in the converter in which the fault occurs.

An example of determining the failure level of a failure has been described in detail with reference to fig. 1 and will not be described herein.

Here, after the fault level determination unit 200 determines a fault level corresponding to each fault occurring in the converter of the wind turbine generator system, the fault level determination unit 200 may detect a highest fault level with a highest level.

The failure processing unit 300 is configured to perform failure processing corresponding to the highest failure level. Here, different fault levels may correspond to different fault processes, and the fault processing unit 300 performing the fault process corresponding to the highest fault level determined by the fault level determination unit 200 may maximally secure the safety of the wind turbine generator set and the like.

Specifically, in the first embodiment, when the highest failure level determined by the failure level determination unit 200 is a non-fault-tolerant type failure, the failure processing unit 300 may perform the following failure processing: the wind generating set is suddenly stopped; and displaying first fault prompt information corresponding to the fault of the fault-intolerance type. In this embodiment, as an example, the fault handling unit 300 may perform the above-described processing by the first fault handling module in the fault handling unit 300.

Here, the emergency stop of the wind turbine generator system means an emergency stop of the wind turbine generator system. Specifically, as an example, the emergency stop of the wind turbine generator system refers to opening a circuit breaker of the wind turbine generator system, bringing a machine-side sub-converter and a grid-side sub-converter in a converter of the wind turbine generator system into a pulse-blocking state, and feathering blades of the wind turbine generator system. Here, to open the circuit breaker of the wind turbine generator system means to open the grid-side circuit breaker and the machine-side circuit breaker of the wind turbine generator system at the same time.

Here, since the determined highest fault level is the highest non-fault-tolerant type fault, the fault processing unit 300 may directly bring the wind turbine generator set to an emergency stop and display the fault indication information to the user, that is, display the first fault indication information corresponding to the non-fault-tolerant type fault.

In the second embodiment, when the highest fault level determined by the fault level determination unit 200 is a fault-tolerant type fault, the fault processing unit 300 may perform the following fault processing: the wind generating set is suddenly stopped; displaying first warning prompt information corresponding to fault-tolerant faults; carrying out self-test on a current transformer of a wind generating set, wherein the self-test detects whether the highest fault disappears in a first preset time period, and the highest fault is a fault corresponding to the highest fault level; when the highest fault is determined to be not disappeared through the self-checking, displaying second fault prompt information corresponding to the fault-tolerant fault; and when the highest fault disappears as determined by the self-checking, the wind generating set is restored to a normal operation state, and the first warning prompt message is not displayed any more. In this embodiment, as an example, the fault handling unit 300 may perform the above-described processing by the second fault handling module in the fault handling unit 300.

Here, since the highest fault level is a fault-tolerant type fault of a higher level, the fault handling unit 300 may first bring the wind turbine generator set to an emergency stop. Also, the fault handling unit 300 may display warning prompt information, i.e., display first warning prompt information corresponding to a fault-tolerant type fault, to a user while causing the wind turbine generator set to suddenly stop.

For example, the fault processing unit 300 may detect whether the highest fault corresponding to the fault of the non-fault-tolerant type disappears within several seconds from the time when the first warning notice information starts to be displayed. It should be understood that the length of the first predetermined period of time may be set according to actual circumstances.

When it is determined that the fault does not disappear within the first predetermined period of time, the fault may be considered to be a continuously existing fault, and at this time, the fault processing unit 300 may display the fault indication information to the user, that is, display the second fault indication information corresponding to the fault-tolerant type fault to the user, instead of displaying the warning indication information (i.e., the first warning indication information). When it is determined that the fault disappears within the first predetermined period of time, it may be determined that the fault no longer exists, and at this time, the fault processing unit 300 may restore the wind turbine generator set to the normal operation state without displaying the warning notice (i.e., the first warning notice).

Furthermore, in another embodiment, fault handling unit 300 may also determine whether a predetermined number of self tests have been performed within a second predetermined time period before performing the self tests; and when it is determined that the self-test has been performed the predetermined number of times within the second predetermined period of time, the fault handling unit 300 may cause the wind turbine generator set to stop abruptly without performing the self-test; when it is determined that the self-test has not been performed the predetermined number of times within the second predetermined period of time, fault handling unit 300 may perform a self-test.

Here, the second predetermined period of time may be much longer than the first predetermined period of time. For example, the fault handling unit 300 may determine the number of times that self-tests corresponding to fault-tolerant type faults are performed within one day, and when the number of times that self-tests are performed reaches a predetermined number, it may be considered that fault-tolerant type faults occur too frequently, and at this time, the fault handling unit 300 may cause the wind turbine generator system to stop suddenly without performing the self-tests; when the number of times of performing the self-test does not reach the predetermined number of times, the fault processing unit 300 may perform the step of self-testing for fault-tolerant type faults.

In the third embodiment, when the highest fault level determined by the fault level determination unit 200 is a normal shutdown type fault, the fault processing unit 300 may perform the following fault processing: displaying second warning prompt information corresponding to the normal shutdown faults; reducing the generated power of the wind generating set according to a first preset mode until the generated power of the wind generating set is reduced to zero; stopping the operation of a machine side sub-converter in the converters; stopping the operation of a grid-side sub-converter in the converter; performing self-test on the converter, wherein the self-test detects whether the highest fault disappears in a first preset time period, and the highest fault is a fault corresponding to the highest fault level; when the highest fault is determined to be not disappeared through the self-checking, displaying third fault prompt information corresponding to the normal shutdown fault; and when the fault disappears as determined by the self-checking, the wind generating set is recovered to a normal operation state, and the second warning prompt message is not displayed any more. In this embodiment, as an example, the fault handling unit 300 may perform the above-described processing by the third fault handling module in the fault handling unit 300.

Here, the fault handling unit 300 may start to reduce the generated power of the wind park in the first predetermined manner when the second warning notice information starts to be displayed. For example, the fault handling unit 300 may reduce the generated power of the wind park to zero according to a predetermined generated power reduction curve.

The fault processing unit 300 may detect whether the highest fault corresponding to the normal shutdown type fault disappears within several seconds from the time when the second warning notice information starts to be displayed. And the length of the first predetermined period of time may be set according to the actual situation. When the fault processing unit 300 determines that the fault does not disappear within the first predetermined period of time, the fault may be considered to be a continuously existing fault, and at this time, the fault processing unit 300 may display the fault indication information to the user, that is, the third fault indication information corresponding to the normal shutdown type fault, instead of the warning indication information (i.e., the second warning indication information). When the fault processing unit 300 determines that the fault disappears within the first predetermined period of time, it may be determined that the fault no longer exists, and at this time, the fault processing unit 300 may restore the wind turbine generator set to the normal operation state without displaying the warning notice information (i.e., the second warning notice information). For example, the fault handling unit 300 may restore the wind turbine to a normal operation state according to the following steps: and the grid side sub-converter in the converter is operated, the machine side sub-converter in the converter is operated, and the generated power of the wind generating set is increased to normal generated power.

Further, in another embodiment, fault handling unit 300 may determine whether a predetermined number of self tests have been performed within a second predetermined time period before performing the self tests; and when it is determined that the self-tests of the predetermined number of times have been performed within the second predetermined period of time, the fault handling unit 300 may cause the wind turbine generator system to maintain a state in which the generated power is zero and the machine-side sub-converter and the grid-side sub-converter in the converters are stopped from operating, without performing the step of self-testing; when it is determined that the self-test has not been performed the predetermined number of times within the second predetermined period of time, fault handling unit 300 may perform a self-test.

Here, the second predetermined period of time may be much longer than the first predetermined period of time. For example, the fault processing unit 300 may determine the number of times that self-checking corresponding to a normal shutdown fault is performed within one day, and when the number of times that self-checking is performed reaches a predetermined number of times, it may be considered that the normal shutdown fault occurs too frequently, and at this time, the fault processing unit 300 may enable the wind turbine generator system to maintain a state where the generated power is zero and the machine-side sub-converter and the grid-side sub-converter in the converter stop operating, and does not perform the step of self-checking any more; when the number of times of performing the self-test does not reach the predetermined number of times, the fault handling unit 300 may perform the step of the self-test for the normal shutdown type fault.

In the fourth embodiment, when the highest fault level determined by the fault level determination unit 200 is a reduced power operation type fault, the fault processing unit 300 may perform the following fault processing: determining a predetermined generated power to which the wind generating set needs to be reduced based on a highest fault corresponding to the highest fault level; reducing the generated power of the wind generating set to the preset generated power according to a second preset mode, and displaying the preset generated power and third warning prompt information corresponding to the power-down operation type fault; periodically detecting whether the highest fault disappears according to a first preset period; when the highest fault disappears, increasing the generated power of the wind generating set to the normal generated power according to a third preset mode, and no longer displaying the third warning prompt message; and when the highest fault is detected not to disappear, keeping the generated power of the wind generating set at the preset generated power. In this embodiment, as an example, the fault handling unit 300 may perform the above-described processing by the fourth fault handling module in the fault handling unit 300.

Here, the highest-level fault is a power-down operation-type fault, and there may be a plurality of specific faults corresponding to the power-down operation-type fault. Thus, the fault handling unit 300 may determine the predetermined generated power to which the wind park needs to be reduced, depending on the specific fault.

Since the reduced-power operation-type fault is lower in level than the normal-stop-type fault, for example, the fault processing unit 300 may reduce the generated power of the wind turbine generator set according to another generated power reduction curve that is more gradual than the generated power reduction curve for reducing the generated power of the wind turbine generator set in fig. 4. For example, the other generated power reduction curve may be a curve indicating a change in the magnitude of the generated power with time.

The fault handling unit 300 may periodically detect whether the fault corresponding to the reduced power operation type fault disappears according to a first predetermined period during the process of reducing the generated power of the wind turbine generator set in the second predetermined manner and after reducing the generated power of the wind turbine generator set to the predetermined generated power. Here, the length of the first predetermined period may be set according to actual circumstances.

Here, when the highest fault is detected to disappear during the process of reducing the generated power of the wind turbine generator set in the second predetermined manner or after reducing the generated power of the wind turbine generator set to the predetermined generated power, it is interpreted that the fault no longer exists, and thus the fault processing unit 300 may increase the generated power of the wind turbine generator set to the normal generated power in the third predetermined manner. For example, the fault handling unit 300 may increase the generated power of the wind turbine generator set to the normal generated power according to a power increase curve having the same degree of gentleness as the other power decrease curve described above. At this time, the third warning message may not be displayed because the failure disappears. When the fault processing unit 300 determines that the fault corresponding to the power down operation type fault has been present through the periodic detection, the predetermined generated power may be maintained, and the display of the third warning notice information may be maintained.

In the fifth embodiment, when the highest fault level determined by the fault level determination unit 200 is a resistance safety mode type fault, the fault processing unit 300 may perform the following fault processing: displaying fourth warning prompt information corresponding to the resistance safety mode type faults, reducing the generated power of the wind generating set according to a first preset mode, and periodically detecting whether the highest fault disappears or not according to a second preset period, wherein the highest fault is a fault corresponding to the highest fault level; when the highest fault disappears in a third preset time period, increasing the generated power of the wind generating set to the normal generated power according to a fourth preset mode; and when the highest fault is detected not to disappear in a third preset time period, the wind generating set is suddenly stopped, and fourth fault prompt information corresponding to the resistor safety mode type fault is displayed. In this embodiment, as an example, the fault handling unit 300 may perform the above-described processing by a fifth fault handling module in the fault handling unit 300.

For example, the fault handling unit 300 may start to reduce the generated power of the wind park according to the generated power reduction curve corresponding to the first predetermined manner in the embodiment of fig. 4 when starting to display the fourth warning notice. The failure processing unit 300 may periodically detect whether the highest failure disappears at a second predetermined cycle within a third predetermined period of time from the time when the fourth warning notice information starts to be displayed. The fault handling unit 300 may increase the generated power of the wind turbine generator set to the normal generated power according to the power increase curve having the same degree of gentleness as the above-described power decrease curve. And at this time, since the failure disappears, the failure processing unit 300 may not display the fourth warning notice information any more.

In the sixth embodiment, when the highest failure level determined by the failure level determination unit 200 is an abnormality presentation type failure, the failure processing unit 300 may perform the following failure processing: displaying fifth warning prompt information corresponding to the abnormal prompt type fault; periodically detecting whether a highest fault disappears according to a third preset period, wherein the highest fault is a fault corresponding to the highest fault level; when the highest fault disappears, the fifth warning prompt message is not displayed; when it is detected that the highest failure does not disappear, the display of the fifth warning notice information is maintained. In this embodiment, as an example, the fault handling unit 300 may perform the above-described processing by the sixth fault handling module in the fault handling unit 300.

Here, the fault handling unit 300 may periodically detect whether the fault corresponding to the abnormality prompt type fault disappears at a third predetermined period while displaying the fifth warning prompt information. Here, the length of the third predetermined period may be set according to actual circumstances. When the highest failure is detected to disappear, the failure processing unit 300 may no longer display the warning notice (e.g., fifth warning notice) since the failure no longer exists. And if the fault is not disappeared, the fault processing unit 300 may periodically detect the fault at a third predetermined period all the time and continuously display the fifth warning notice message. In this embodiment, the fault handling unit 300 may maintain the generated power of the wind park as the normal generated power.

Furthermore, according to another embodiment, in order to timely find a fault of a converter of the wind park, the detection unit 100 may periodically detect a fault of a converter of the wind park. As an example, the detection unit 100 may periodically detect whether the converter has failed according to a fourth predetermined period. Here, the length of the fourth predetermined period may be set according to actual circumstances.

In this case, when the detecting unit 100 detects that at least one fault occurs in the converter in one cycle, the fault level determining unit 200 may determine a fault level corresponding to each fault in the at least one fault in the one cycle, and may determine a highest fault level in all the determined fault levels in the one cycle. The failure processing unit 300 performs failure processing corresponding to the highest failure level from the time when the highest failure level is determined in the one cycle.

In this case, in order to ensure that the failure process performed by the failure processing unit 300 is always the failure process corresponding to the highest failure rank determined by the failure rank determination unit 200, as an example, if, while the failure processing unit 300 is performing the failure process corresponding to the highest failure rank, in another cycle after the one cycle, the detection unit 100 detects a new failure, and the failure rank determination unit 200 determines that there is a failure having a new highest failure rank higher than the highest failure rank among the new failures, the failure processing unit 300 may stop the failure process corresponding to the highest failure rank and start performing the failure process corresponding to the new highest failure rank.

By adopting the fault processing device of the converter of the wind generating set, disclosed by the exemplary embodiment of the invention, different fault processing can be executed by determining different levels of faults of the converter, so that the loss caused by frequent shutdown of the wind generating set due to faults can be avoided.

There is also provided, in accordance with an exemplary embodiment of the present invention, a computer-readable storage medium storing a computer program. The computer program, when being executed by a processor, implements a method of fault handling for a converter of a wind park as described above. The computer readable recording medium is any data storage device that can store data read by a computer system. Examples of the computer-readable recording medium include: read-only memory, random access memory, read-only optical disks, magnetic tapes, floppy disks, optical data storage devices, and carrier waves (such as data transmission through the internet via wired or wireless transmission paths). The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion. In addition, functional programs, codes, and code segments for accomplishing the present invention can be easily construed by programmers of ordinary skill in the art to which the present invention pertains within the scope of the present invention.

There is also provided in accordance with an exemplary embodiment of the invention a control system at a wind park. The control system of the wind generating set comprises a processor and a memory. The memory is configured to store a computer program. The computer program is executed by a processor with program instructions causing the processor to execute the method of fault handling of a converter of a wind park as described above.

Furthermore, each unit in the above-described apparatuses and devices according to exemplary embodiments of the present invention may be implemented as a hardware component or a software module. Further, the respective units may be implemented by using, for example, a Field Programmable Gate Array (FPGA), an Application Specific Integrated Circuit (ASIC), or a processor according to the processing performed by the respective units defined by those skilled in the art.

It should be noted that the above embodiments of the present invention are merely exemplary, and the present invention is not limited thereto. Those skilled in the art will understand that: changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.

Claims

1. A fault handling method for a converter of a wind generating set is characterized by comprising the following steps:

detecting whether the converter has a fault;

when at least one fault of the converter is detected in one period, determining a fault level corresponding to each fault in the at least one fault in the one period;

directly performing a failure process corresponding to the highest failure level among all the determined failure levels from the time when the highest failure level is determined within the one period,

the step of detecting whether the converter breaks down comprises the following steps: periodically detecting whether the converter is out of order according to a fourth predetermined period,

wherein if a new fault is detected in the step of detecting whether the converter is faulty in another cycle after the one cycle while the fault process corresponding to the highest fault class is being performed in the step of performing the fault process, and it is determined that there is a fault having a new highest fault class higher than the highest fault class among the new faults in the step of determining the highest fault class, the fault process corresponding to the highest fault class is stopped and the fault process corresponding to the new highest fault class is started in the step of performing the fault process.

2. The fault handling method of claim 1, wherein the fault classes include non-fault-tolerant class faults, normal shutdown class faults, reduced power operation class faults, resistive safety mode class faults, and abnormal alert class faults that are successively lower in class.

3. The fault handling method of claim 1, wherein the fault level corresponding to each fault is determined according to at least one of: the fault comprises a fault level, a fault level and a fault level, wherein the fault level comprises one or more faults, the fault level comprises a current change degree of the converter caused by the fault, a temperature change degree of the converter caused by the fault, a voltage change degree of the converter caused by the fault, and a type of a device in the converter, wherein the fault corresponds to each fault level.

4. The fault handling method of claim 1, wherein when the highest fault level is a non-fault tolerant type fault, performing fault handling comprises:

the wind generating set is suddenly stopped;

and displaying first fault prompt information corresponding to the fault of the fault-intolerance type.

5. The fault handling method according to claim 1, wherein when the highest fault level is a fault-tolerant type fault, the step of performing fault handling includes:

the wind generating set is suddenly stopped;

displaying first warning prompt information corresponding to fault-tolerant faults;

carrying out self-test on a current transformer of a wind generating set, wherein the self-test detects whether the highest fault disappears in a first preset time period, and the highest fault is a fault corresponding to the highest fault level;

when the highest fault is determined to be not disappeared through the self-checking, displaying second fault prompt information corresponding to the fault-tolerant fault;

and when the highest fault disappears as determined by the self-checking, the wind generating set is restored to a normal operation state, and the first warning prompt message is not displayed any more.

6. The fault handling method of claim 1, wherein when the highest fault level is a normal shutdown type fault, the step of performing fault handling comprises:

displaying second warning prompt information corresponding to the normal shutdown faults;

reducing the generated power of the wind generating set according to a first preset mode until the generated power of the wind generating set is reduced to zero;

stopping the operation of a machine side sub-converter in the converters;

stopping the operation of a grid-side sub-converter in the converter;

when the highest fault is determined to be not disappeared through the self-checking, displaying third fault prompt information corresponding to the normal shutdown fault;

and when the fault disappears as determined by the self-checking, the wind generating set is recovered to a normal operation state, and the second warning prompt message is not displayed any more.

7. The fault handling method of claim 1, wherein when the highest fault level is a reduced power operation class fault, the step of performing fault handling comprises:

determining a predetermined generated power to which the wind generating set needs to be reduced based on a highest fault corresponding to the highest fault level;

reducing the generated power of the wind generating set to the preset generated power according to a second preset mode, and displaying the preset generated power and third warning prompt information corresponding to the power-down operation type fault;

periodically detecting whether the highest fault disappears according to a first preset period;

when the highest fault disappears, increasing the generated power of the wind generating set to the normal generated power according to a third preset mode, and no longer displaying the third warning prompt message;

and when the highest fault is detected not to disappear, keeping the generated power of the wind generating set at the preset generated power.

8. The fault handling method of claim 1, wherein when the highest fault level is a resistive safety mode type fault, the step of performing fault handling comprises:

displaying fourth warning prompt information corresponding to the resistance safety mode type faults, reducing the generated power of the wind generating set according to a first preset mode, and periodically detecting whether the highest fault disappears or not according to a second preset period, wherein the highest fault is a fault corresponding to the highest fault level;

when the highest fault disappears in a third preset time period, increasing the generated power of the wind generating set to the normal generated power according to a fourth preset mode;

and when the highest fault is detected not to disappear in a third preset time period, the wind generating set is suddenly stopped, and fourth fault prompt information corresponding to the resistor safety mode type fault is displayed.

9. The fault handling method of claim 1, wherein when the highest fault level is an exception hint class fault, the step of performing fault handling comprises:

displaying fifth warning prompt information corresponding to the abnormal prompt type fault;

periodically detecting whether a highest fault disappears according to a third preset period, wherein the highest fault is a fault corresponding to the highest fault level;

when the highest fault disappears, the fifth warning prompt message is not displayed;

when it is detected that the highest failure does not disappear, the display of the fifth warning notice information is maintained.

10. The fault handling method of claim 1 wherein the step of determining the highest fault level comprises: determining the highest fault level in all the determined fault levels in the period.

11. A fault handling device of a converter of a wind turbine generator system, the fault handling device comprising:

a detection unit configured to detect whether the converter has a fault;

the fault level determination unit is configured to determine a fault level corresponding to each fault in at least one fault in a period when the detection unit detects that the converter has at least one fault in the period, and determine the highest fault level in all the determined fault levels;

a failure processing unit configured to directly execute failure processing corresponding to the highest failure level from a time when the highest failure level is determined within the one cycle,

wherein the detection unit is configured to: periodically detecting whether the converter is out of order according to a fourth predetermined period,

12. The fault handling device of claim 11, wherein the fault levels comprise sequentially lower non-fault tolerant class faults, normal shutdown class faults, reduced power operation class faults, resistive safe mode class faults, and abnormal alert class faults.

13. The fault handling device of claim 11, wherein the fault level determination unit determines the fault level corresponding to each fault according to at least one of: the fault comprises a fault level, a fault level and a fault level, wherein the fault level comprises one or more faults, the fault level comprises a current change degree of the converter caused by the fault, a temperature change degree of the converter caused by the fault, a voltage change degree of the converter caused by the fault, and a type of a device in the converter, wherein the fault corresponds to each fault level.

14. The fault handling device of claim 11, wherein the fault handling unit comprises at least one of the following fault handling modules, each fault handling module comprising:

the first fault processing module is used for making the wind generating set suddenly stop when the highest fault level is a fault which cannot be fault-tolerant; displaying first fault prompt information corresponding to the fault of the fault-intolerance type;

the second fault processing module is used for making the wind generating set suddenly stop when the highest fault level is a fault-tolerant fault; displaying first warning prompt information corresponding to fault-tolerant faults; carrying out self-checking on a current transformer of the wind generating set, wherein the self-checking detects whether the highest fault disappears in a first preset time period; when the highest fault is determined to be not disappeared through the self-checking, displaying second fault prompt information corresponding to the fault-tolerant fault; when the highest fault disappears as determined by the self-checking, the wind generating set is recovered to a normal operation state, and the first warning prompt message is not displayed any more;

the third fault processing module is used for displaying second warning prompt information corresponding to the normal shutdown fault when the highest fault level is the normal shutdown fault; reducing the generated power of the wind generating set according to a first preset mode until the generated power of the wind generating set is reduced to zero; stopping the operation of a machine side sub-converter in the converters; stopping the operation of a grid-side sub-converter in the converter; carrying out self-checking on a current transformer of the wind generating set, wherein the self-checking detects whether the highest fault disappears in a first preset time period; when the highest fault is determined to be not disappeared through the self-checking, displaying third fault prompt information corresponding to the normal shutdown fault; when the fault disappears, the wind generating set is recovered to a normal operation state, and the second warning prompt message is not displayed;

the fourth fault processing module is used for determining the preset generating power to which the wind generating set needs to be reduced based on the highest fault corresponding to the highest fault grade when the highest fault grade is the reduced power operation type fault; reducing the generated power of the wind generating set to the preset generated power according to a second preset mode, and displaying the preset generated power and third warning prompt information corresponding to the power-down operation type fault; periodically detecting whether the highest fault disappears according to a first preset period; when the highest fault disappears, increasing the generated power of the wind generating set to the normal generated power according to a third preset mode, and no longer displaying the third warning prompt message; when the highest fault is detected not to disappear, keeping the generated power of the wind generating set at the preset generated power;

the fifth fault processing module is used for displaying fourth warning prompt information corresponding to the resistance safety mode type fault when the highest fault level is the resistance safety mode type fault, reducing the generating power of the wind generating set according to a first preset mode, and periodically detecting whether the highest fault disappears according to a second preset period, wherein the highest fault is the fault corresponding to the highest fault level; when the highest fault disappears in a third preset time period, increasing the generated power of the wind generating set to the normal generated power according to a fourth preset mode; when the highest fault is detected not to disappear in a third preset time period, the wind generating set is suddenly stopped, and fourth fault prompt information corresponding to the resistor safety mode type fault is displayed;

the sixth fault processing module is used for displaying fifth warning prompt information corresponding to the abnormal prompt type fault when the highest fault level is the abnormal prompt type fault; periodically detecting whether the highest fault disappears according to a third preset period; when the highest fault disappears, the fifth warning prompt message is not displayed; when the highest fault is detected not to disappear, keeping the display of the fifth warning prompt message;

wherein the highest fault is a fault corresponding to the highest fault level.

15. A computer-readable storage medium storing a computer program which, when executed by a processor, implements the method of any one of claims 1 to 10.

16. A control system of a wind power plant, characterized in that the control system comprises:

a processor;

memory storing a computer program which, when executed by a processor, implements the method of any one of claims 1 to 10.