CN108123481B - Wind power high-frequency cutting machine control device and method - Google Patents
Wind power high-frequency cutting machine control device and method Download PDFInfo
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- CN108123481B CN108123481B CN201611078149.7A CN201611078149A CN108123481B CN 108123481 B CN108123481 B CN 108123481B CN 201611078149 A CN201611078149 A CN 201611078149A CN 108123481 B CN108123481 B CN 108123481B
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Abstract
The invention discloses a wind power high-frequency generator tripping control device and method, relates to the technical field of wind power, and aims to effectively control generator tripping in a wind power plant with rapid system frequency characteristic change. The wind power high-frequency generator tripping control method comprises the steps of measuring the bus frequency of a wind power plant, carrying out high-frequency out-of-limit analysis on the bus frequency of the wind power plant, and obtaining the high-frequency out-of-limit time t of the bus of the wind power plant according to the high-frequency out-of-limit state of the wind power plant when the bus frequency of the wind power plant is in the high-frequency out-of-limit state of the wind power plant; generating a generator tripping control instruction representing a generator tripping amount according to the high-frequency out-of-limit time t of a bus of the wind power plant; and issuing a generator tripping control instruction to the generator tripping control device to realize generator tripping of the generator set in the wind power plant. The wind power high-frequency generator tripping control device is used for realizing a wind power high-frequency generator tripping control method. The wind power high-frequency generator tripping control device provided by the invention is used in a wind power generator tripping.
Description
Technical Field
The invention relates to the technical field of wind power, in particular to a wind power high-frequency cutting machine control device and method.
Background
The high-frequency generator tripping control device of the fan is a device for controlling the generator tripping on the spot based on a high-frequency value and time delay which are independently set by each wind turbine, has the advantages of strong pertinence and reliability, and is widely applied to the control of the high-frequency generator tripping of the wind turbine of a user.
However, when the frequency characteristics of the wind turbine generator set in the power system are changed greatly, the high-frequency generator tripping control device of the wind turbine generator set may have blind actions in a large range, and cannot effectively perform generator tripping control; therefore, the high-frequency generator tripping control device of the fan has certain limitation in the application of the wind power plant with rapid change of the system frequency characteristic.
Disclosure of Invention
The invention aims to provide a wind power high-frequency generator tripping control device and method, which are used for effectively controlling generator tripping in a wind power plant with rapid system frequency characteristic change.
In order to achieve the above purpose, the invention provides the following technical scheme:
a wind power high-frequency generator tripping control method comprises the following steps:
measuring the bus frequency of a wind power plant, and carrying out high-frequency out-of-limit analysis on the bus frequency of the wind power plant;
when the bus frequency of the wind power plant is in the high-frequency out-of-limit state of the wind power plant, obtaining the bus high-frequency out-of-limit time t of the wind power plant according to the high-frequency out-of-limit state of the wind power plant;
generating a generator tripping control instruction representing a generator tripping amount according to the high-frequency out-of-limit time t of the bus of the wind power plant; and issuing a cutting machine control instruction to a cutting machine control device, so that the cutting machine control device cuts off the units in the wind power plant according to the cutting machine control instruction.
Compared with the prior art, the control method of the wind power high-frequency generator tripping machine provided by the invention has the following beneficial effects:
according to the wind power high-frequency generator tripping control method, the bus frequency of the wind power plant is measured, and the high-frequency out-of-limit analysis is carried out on the bus frequency of the wind power plant, so that a generator tripping control instruction representing the generator tripping amount can be generated according to the high-frequency out-of-limit duration of the bus of the wind power plant when the bus frequency of the wind power plant is in the high-frequency out-of-limit state of the wind power plant; therefore, the wind power high-frequency generator tripping control method provided by the invention can be used for generating generator tripping control instructions under the condition of considering the system frequency characteristic of the wind power plant, and the system frequency characteristic of the wind power plant can be influenced due to the frequency fluctuation of the wind power machine in the wind power plant.
The invention also provides a wind power high-frequency cutting machine control device, which comprises: the system comprises a phasor measurement unit, a high-frequency out-of-limit analysis unit and a central processing unit connected with the input end of a cutter control device; the output end of the phasor measurement unit is connected with the input end of the central processing unit through a high-frequency out-of-limit analysis unit;
the phasor measurement unit is used for measuring the bus frequency of the wind power plant;
the high-frequency out-of-limit analysis unit is used for carrying out high-frequency out-of-limit analysis on the bus frequency of the wind power plant;
the central processing unit is used for obtaining the high-frequency out-of-limit time t of the bus of the wind power plant according to the high-frequency out-of-limit state of the wind power plant when the bus frequency of the wind power plant is in the high-frequency out-of-limit state of the wind power plant, generating a generator tripping control instruction representing the generator tripping amount according to the high-frequency out-of-limit time t of the bus of the wind power plant, and issuing the generator tripping control instruction to the generator tripping control device to enable the generator tripping control device to cut off the units in the wind power plant according to the generator tripping control instruction.
Compared with the prior art, the wind power high-frequency generator tripping control device provided by the invention has the same beneficial effects as the wind power high-frequency generator tripping control method provided by the technical scheme, and the details are not repeated herein.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a flowchart of a wind power high-frequency generator tripping control method according to an embodiment of the present invention;
FIG. 2 is a flowchart of a method for performing high-frequency out-of-limit analysis on a bus frequency of a wind farm in a first embodiment of the present invention;
FIG. 3 is a flow diagram of a method of FIG. 1 for generating trip control commands indicative of a trip quantity;
fig. 4 is a structural block diagram of a wind power high-frequency generator tripping control device provided by the second embodiment of the invention;
fig. 5 is a structural block diagram ii of a wind power high-frequency generator tripping control device provided in the second embodiment of the present invention;
fig. 6 is a structural block diagram iii of a wind power high-frequency generator tripping control device provided in the second embodiment of the present invention;
fig. 7 is a schematic diagram of a device of a cutter instruction generating terminal according to a third embodiment of the present invention;
reference numerals:
1-a phasor measuring unit and 2-a high-frequency out-of-limit analysis unit;
21-high frequency identification module, 211-frequency icon detection module;
212-high frequency discrimination module, 22-mutation timing module;
221-trigger module, 222-timing module;
3-central processing unit, 31-state decision module;
32-an operation mode identification module, 33-a time difference value calculation module;
34-instruction generation module, 301-processor;
302-memory, 303-transceiver;
304-bus, 4-cutter control device.
Detailed Description
In order to further explain the device and method for controlling the high-frequency wind power generator tripping and the generator tripping instruction generating terminal provided by the embodiment of the invention, the following detailed description is given with reference to the accompanying drawings of the specification.
Example one
Referring to fig. 1, a method for controlling a wind power high-frequency generator tripping provided by the embodiment of the present invention includes:
firstly, measuring the bus frequency of a wind power plant, and carrying out high-frequency out-of-limit analysis on the bus frequency of the wind power plant;
secondly, when the bus frequency of the wind power plant is in the high-frequency out-of-limit state of the wind power plant, obtaining the bus high-frequency out-of-limit time t of the wind power plant according to the high-frequency out-of-limit state of the wind power plant;
thirdly, generating a generator tripping control instruction representing a generator tripping amount according to the high-frequency out-of-limit time t of the bus of the wind power plant;
and fourthly, issuing a generator tripping control instruction to the generator tripping control device, and enabling the generator tripping control device to cut off the units in the wind power plant according to the generator tripping control instruction.
According to the wind power high-frequency generator tripping control method provided by the embodiment, the generator tripping control instruction representing the generator tripping amount can be generated according to the high-frequency out-of-limit time length of the bus of the wind power plant when the bus frequency of the wind power plant is in the high-frequency out-of-limit state of the wind power plant by measuring the bus frequency of the wind power plant and performing high-frequency out-of-limit analysis on the bus frequency of the wind power plant; therefore, in the wind power high-frequency generator tripping control method provided by the embodiment, the generator tripping control instruction is generated under the condition that the system frequency characteristic of the wind power plant is considered, and the system frequency characteristic of the wind power plant is influenced due to the frequency fluctuation of the wind power plant in the wind power plant.
It should be noted that, in the above embodiment, a generator tripping control instruction is issued to the generator tripping control device, so that the generator tripping control device trips the units in the wind farm according to the generator tripping control instruction, specifically: and issuing a generator tripping control instruction to each wind turbine of the wind power plant, so that a generator tripping control device in each wind turbine determines whether to trip the wind turbine.
For example: when the quantity of the generator tripping represented by the generator tripping control instruction is 0.3, the generator tripping control instruction is issued to each wind turbine in the wind power plant, and only 30% of the wind turbines in the wind power plant need to be controlled to perform generator tripping, and specific control of which wind turbines to perform generator tripping is relatively random and is not limited; in other words, although the generator tripping control command is issued to each wind turbine in the wind farm, not every wind turbine in the wind farm is tripped by the corresponding generator tripping control device.
It can be understood that when the bus frequency of the wind farm is measured, the bus frequency of the wind farm can be directly measured, or the bus frequency can be measured by a certain method; for example: and measuring the electrical data reflecting the frequency characteristic of the wind power plant, and obtaining the bus frequency of the wind power plant according to the electrical data reflecting the frequency characteristic of the wind power plant.
Further, referring to fig. 2, in the wind power high-frequency generator tripping control method provided in the above embodiment, the method for performing high-frequency out-of-limit analysis on the bus frequency of the wind farm includes:
firstly, judging whether the bus frequency of the wind power plant reaches the mutation frequency;
secondly, when the bus frequency of the wind power plant changes suddenly, timing the out-of-limit time of the bus frequency of the wind power plant to obtain the bus out-of-limit time t of the wind power plant; meanwhile, judging whether the bus frequency of the wind power plant is a high-frequency;
thirdly, when the bus frequency of the wind power plant is high-frequency, judging that the bus out-of-limit time t of the wind power plant exceeds the reference out-of-limit time t0And then, determining that the bus frequency of the wind power plant is in the high-frequency out-of-limit state of the wind power plant, and setting the bus out-of-limit time t of the wind power plant in the high-frequency out-of-limit state of the wind power plant as the bus high-frequency out-of-limit time t of the wind power plant.
According to the limitation of the method for performing the high-frequency out-of-limit analysis on the bus frequency of the wind farm in the embodiment, when judging whether the bus frequency of the wind farm is in the high-frequency out-of-limit state of the wind farm, whether the bus frequency of the wind farm reaches the mutation frequency needs to be judged first, that is, before judging whether the bus frequency of the wind farm is in the high-frequency out-of-limit state of the wind farm, whether the bus frequency of the wind farm is mutated or not needs to be considered, when the bus frequency of the wind farm is mutated, the out-of-limit time of the bus frequency of the wind farm obtained under the mutation is further respectively timed to obtain the bus out-of-limit time t of the wind farm, whether the bus frequency of the wind farm is the high-frequency is judged, and when the bus frequency of the wind farm is0And then, the bus frequency of the wind power plant can be determined to be in the high-frequency out-of-limit state of the wind power plant.
It can be seen that when the high-frequency out-of-limit analysis is performed on the bus frequency of the wind farm in the embodiment, it is not possible to determine whether the bus frequency of the wind farm is in the high-frequency out-of-limit state of the wind farm under any frequency, but it is necessary to determine whether the bus frequency of the wind farm is in the high-frequency out-of-limit state of the wind farm only when it is required to consider whether the bus frequency of the wind farm is mutated; in other words, if the bus frequency of the wind farm changes suddenly after the frequency characteristic of any wind turbine generator in the wind farm changes greatly, the bus frequency of the wind farm is determined to change quickly by judging whether the bus frequency of the wind farm reaches the sudden change frequency, the bus frequency of the wind farm changes suddenly when the system frequency characteristic of the wind farm changes quickly, and the generator tripping control instruction generated under the condition can effectively control the wind turbine generator in the wind farm.
It should be noted that, after the bus frequency of the wind farm reaches the mutation frequency, the out-of-limit time of the bus frequency obtained by the wind farm is timed to obtain the bus out-of-limit time t of the wind farm; judging whether the bus frequency of the wind power plant is a high-frequency or not; wherein,
the bus frequency of the wind power plant can be set to have a plurality of mutation frequencies, as long as the bus frequency of the wind power plant reaches one mutation frequency, the bus frequency of the wind power plant can be considered to reach the mutation frequency, then the out-of-limit time of the bus frequency of the wind power plant under the current mutation frequency is timed to obtain the bus out-of-limit time t of the wind power plant, and whether the bus frequency of the wind power plant is the high-frequency is judged; and when the bus frequency of the wind power plant reaches the next sudden change frequency, the bus frequency of the wind power plant can be considered to reach the sudden change frequency, and the operation is carried out as above.
Optionally, in order to improve the accuracy of the method for determining whether the bus frequency of the wind farm is the high-frequency, the method for determining whether the bus frequency of the wind farm is the high-frequency specifically includes: judging whether the relative difference value of the change of the bus frequency of the wind power plant meets a preset relative difference value or not, judging whether the absolute difference value of the frequency change of the bus frequency of the wind power plant meets a preset absolute difference value or not, and judging whether the frequency change slope of the bus frequency of the wind power plant meets a preset change slope or not;
and when the change relative difference of the bus frequency of the wind power plant accords with the preset relative difference, the absolute difference of the frequency change of the bus frequency of the wind power plant accords with the preset absolute difference, and the frequency change slope of the bus frequency of the wind power plant accords with the preset change slope, the bus frequency of the wind power plant is high-frequency.
In addition, referring to fig. 3, in the wind power high-frequency generator tripping control method provided in the above embodiment, there are various methods for generating a generator tripping control instruction representing a generator tripping amount according to a high-frequency out-of-limit time t of a bus of a wind farm, and this embodiment provides a specific method for generating a generator tripping control instruction representing a generator tripping amount, which is specifically as follows:
firstly, according to the high-frequency out-of-limit time t of a bus of a wind power plant and a reference out-of-limit time t0Obtaining an out-of-limit difference value delta t; wherein, t-t is0；
Secondly, generating a cutting machine control instruction representing the cutting machine amount according to the out-of-limit difference value delta t; the method can generate the generator tripping control instruction in a targeted manner, has good adaptability, provides a new high-frequency generator tripping measure for the large-scale wind power production of the power system, and can avoid large-scale rejection or misoperation of the wind turbine generator set after the system fails.
For example: when the out-of-limit difference value is 0.2Hz, the generator tripping amount represented by the generator tripping control command is 0.2, namely 20% of the number of wind generating sets in the running wind power plant is cut off, and the rest 80% of the wind generating sets run normally; when the out-of-limit difference value is 0.4Hz, the generator tripping amount represented by the generator tripping control command is 0.4, namely 40% of the number of the wind generating sets in the running wind power plant is cut off, and the rest 60% of the wind generating sets run normally.
Further, since the generator tripping control instruction corresponds to the number of wind turbine generators in the operating wind farm, please continue to refer to fig. 3, the method for generating the generator tripping control instruction representing the generator tripping amount according to the bus high-frequency out-of-limit time t of the wind farm further includes: identifying the operation mode of each unit in the wind power plant, and generating a generator tripping control instruction representing the generator tripping amount according to the operation mode of the units in the wind power plant and the out-of-limit difference value delta t; therefore, by identifying the operation mode of the wind turbine generator in the wind power plant, on the basis, the out-of-limit difference value delta t is generated to represent the generator tripping control instruction of the generator tripping quantity, the generator tripping control instruction can be more reliably issued to the wind turbine generator needing to be tripped, and effective generator tripping control on the wind turbine generator in the wind power plant is achieved.
Example two
Referring to fig. 1 and 4, an embodiment of the present invention provides a wind power high-frequency generator tripping control device, including: the system comprises a phasor measuring unit 1, a high-frequency out-of-limit analysis unit 2 and a central processing unit 3 connected with the input end of a cutter control device 4; the output end of the phasor measurement unit 1 is connected with the input end of the central processing unit 3 through the high-frequency out-of-limit analysis unit 2;
the phasor measurement unit 1 is used for measuring the bus frequency of the wind power plant;
the high-frequency out-of-limit analysis unit 2 is used for performing high-frequency out-of-limit analysis on the bus frequency of the wind power plant;
the central processing unit 3 is used for obtaining the high-frequency out-of-limit time t of the bus of the wind power plant according to the high-frequency out-of-limit state of the wind power plant when the bus frequency of the wind power plant is in the high-frequency out-of-limit state of the wind power plant, generating a generator tripping control instruction representing the generator tripping amount according to the high-frequency out-of-limit time t of the bus of the wind power plant, and issuing the generator tripping control instruction to the generator tripping control device 4 to enable the generator tripping control device 4 to cut off the units in the wind power plant according.
How the wind power high-frequency generator tripping control device provided by the embodiment realizes the wind power high-frequency generator tripping control is specifically described below with reference to fig. 1 and 4, and the specific description is as follows:
firstly, a phasor measurement unit 1 measures the bus frequency of a wind power plant; the high-frequency out-of-limit analysis unit 2 is used for carrying out high-frequency out-of-limit analysis on the bus frequency of the wind power plant;
specifically, the phasor measurement unit 1 generally measures electrical data reflecting the system frequency characteristics of the wind farm, but the electrical data can represent the system frequency of the wind farm, so that the phasor measurement unit 1 essentially measures the bus frequency of the wind farm;
secondly, when the bus frequency of the wind power plant is in the high-frequency out-of-limit state of the wind power plant, the central processing unit 3 obtains the bus high-frequency out-of-limit time t of the wind power plant according to the high-frequency out-of-limit state of the wind power plant;
thirdly, the central processing unit 3 generates a generator tripping control instruction representing the generator tripping amount according to the high-frequency out-of-limit time t of the bus of the wind power plant;
fourthly, the central processing unit 3 sends a cutting machine control instruction to the cutting machine control device 4, so that the cutting machine control device 4 cuts off the units in the wind power plant according to the cutting machine control instruction.
Compared with the prior art, the beneficial effects of the wind power high-frequency generator tripping control device provided by the embodiment of the invention are the same as those of the wind power high-frequency generator tripping control method provided by the embodiment, and the detailed description is omitted here.
Optionally, referring to fig. 2, fig. 5 and fig. 6, the high frequency out-of-limit analysis unit 2 in the above embodiment includes a high frequency identification module 21 and a mutation timing module 22; the input end of the high-frequency identification module 21 is connected with the output end of the phasor measurement unit 22, and the output end of the high-frequency identification module 21 is respectively connected with the input end of the central processing unit 3 and the input end of the mutation timing module 22; the output end of the mutation timing module 22 is connected with the input end of the central processing unit 3;
the high-frequency identification module 21 is configured to determine whether the bus frequency of the wind farm reaches a sudden change frequency, and when the bus frequency of the wind farm changes suddenly, determine whether the bus frequency of the wind farm is a high-frequency;
the sudden change timing module 22 is used for timing the out-of-limit time of the bus frequency of the wind power plant when the bus frequency of the wind power plant is suddenly changed to obtain the bus out-of-limit time t of the wind power plant;
the central processing unit 3 is also used for determining that the bus frequency of the wind power plant is high frequency and the bus out-of-limit time t of the wind power plant exceeds the reference out-of-limit time t0And then, determining that the bus frequency of the wind power plant is in a high-frequency out-of-limit state, and setting the bus out-of-limit time t of the wind power plant in the high-frequency out-of-limit state of the wind power plant as the bus high-frequency out-of-limit time t of the wind power plant.
Please refer to fig. 3 and 5, the central processing unit 3 in the above embodiment includes a state determining module 31, a time difference calculating module 33, and a command generating module 34; the output end of the high-frequency identification module 21 and the output end of the sudden change timing module 22 are respectively connected with the input end of the state judgment module 31, the output end of the state judgment module 31 is connected with the input end of the instruction generation module 34 through the time difference value calculation module 33, and the output end of the instruction generation module 34 is connected with the input end of the cutter control device 4;
the state determination module 31 is configured to determine that the bus-bar out-of-limit duration of the wind farm exceeds the reference out-of-limit duration t when the bus-bar frequency of the wind farm is a high-frequency0Determining that the bus frequency of the wind power plant is in a high-frequency out-of-limit state;
the time difference value calculating module 33 is configured to set a bus bar out-of-limit time t of the wind farm in the high-frequency out-of-limit state of the wind farm to a bus bar high-frequency out-of-limit time t of the wind farm, and set the bus bar out-of-limit time t to the reference out-of-limit time t according to the bus bar high-frequency out-of-limit time t of the wind farm0Obtaining an out-of-limit difference value delta t; wherein, t-t is0；
The instruction generating module 34 is configured to generate a cutting machine control instruction representing a cutting machine amount according to the out-of-limit difference value Δ t, and issue the cutting machine control instruction to the cutting machine control device 4, so that the cutting machine control device 4 cuts off the units in the wind farm according to the cutting machine control instruction; and the larger the out-of-limit difference value delta t is, the larger the cutting machine control instruction representation cutting machine quantity is.
Optionally, the central processing unit 3 in the above embodiment further includes an operation mode identification module 32 for connecting to each unit in the wind farm, and an output end of the operation mode identification module 32 is connected to an input end of the instruction generation module 34; the operation mode identification module 32 is used for identifying the operation mode of each unit in the wind power plant; the instruction generating module 32 is configured to generate a generator tripping control instruction representing a generator tripping amount according to the unit operation mode and the out-of-limit difference value Δ t in the wind power plant.
Further, referring to fig. 6, the high frequency identification module 21 in the above embodiment includes a frequency mutation detection module 211 and a high frequency identification module 212; the mutation timing module 22 comprises a triggering module 221 and a timing module 222; the input end of the frequency mutation detection module 211 is connected with the output end of the phasor measurement unit 1, the output end of the frequency mutation detection module 211 is respectively connected with the input end of the high-frequency discrimination module 212 and the input end of the trigger module 221, the trigger module 221 is connected with the input end of the timing module 222, and the output end of the high-frequency discrimination module 212 and the output end of the timing module 222 are respectively connected with the input end of the central processing unit 3;
the frequency mutation detection module 211 is configured to determine whether the bus frequency of the wind farm reaches a mutation frequency;
the high-frequency judging module 212 is used for judging whether the bus frequency of the wind power plant is high-frequency when the bus frequency of the wind power plant changes suddenly;
the triggering module 221 is configured to send a timing triggering signal when the bus frequency of the wind farm changes suddenly;
the timing module 222 is configured to time the out-of-limit time of the bus frequency of the wind farm according to the timing trigger signal, so as to obtain a bus out-of-limit time t of the wind farm.
Considering the accuracy of the high-frequency discrimination module 212 in determining whether the frequency is the high-frequency, the high-frequency discrimination module 212 in the above embodiment includes a relative difference discrimination sub-module, an absolute difference discrimination sub-module, and a change slope discrimination sub-module; the input end of the relative difference value discrimination submodule, the input end of the absolute difference value discrimination submodule and the input end of the change slope discrimination submodule are respectively connected with the output end of the frequency mutation detection module 211, and the output end of the relative difference value discrimination submodule, the output end of the absolute difference value discrimination submodule and the output end of the change slope discrimination submodule are respectively connected with the input end of the central processing unit 3;
the relative difference value judging submodule is used for judging whether the change relative difference value of the bus frequency of the wind power plant meets a preset relative difference value or not;
the absolute difference value judgment submodule is used for judging whether the absolute difference value of the frequency change of the bus frequency of the wind power plant meets a preset absolute difference value or not;
the change slope judgment submodule is used for judging whether the frequency change slope of the bus frequency of the wind power plant meets a preset change slope or not;
the central processing unit 3 is configured to determine that the bus frequency of the wind farm is the high-frequency when the change relative difference of the bus frequency of the wind farm conforms to the preset relative difference, the absolute difference of the frequency change of the bus frequency of the wind farm conforms to the preset absolute difference, and the frequency change slope of the bus frequency of the wind farm conforms to the preset change slope.
It can be understood that, in terms of hardware implementation, the relative difference determination submodule, the absolute difference determination submodule, and the change slope determination submodule may be regarded as a comparator or a determiner, and when the output results are all 1, the relative difference value representing the change of the bus frequency of the wind farm conforms to the preset relative difference value, the absolute difference value representing the frequency change of the bus frequency of the wind farm conforms to the preset absolute difference value, and the frequency change slope of the bus frequency of the wind farm conforms to the preset change slope, so that the central processing unit 3 should determine whether the output results of the relative difference determination submodule, the absolute difference determination submodule, and the change slope determination submodule are all 1, so as to determine whether the bus frequency of the wind farm is the high-frequency. Alternatively, if the central processing unit 3 has the structure shown in fig. 5, the state determination module 31 in the central processing unit 3 determines whether the output results of the relative difference determination submodule, the absolute difference determination submodule, and the change slope determination submodule are all 1, so as to determine whether the bus frequency of the wind farm is the high-frequency.
The following further describes the working process of the high-frequency out-of-limit analysis unit 2 and the central processing unit 3 in the wind power high-frequency cutting machine control device provided by the above embodiment with reference to fig. 2 and 3, and fig. 5 and 6, and the specific working process is as follows:
firstly, a frequency mutation detection module 211 judges whether the bus frequency of the wind power plant reaches a mutation frequency;
specifically, the relative difference value judging submodule judges whether the change relative difference value of the bus frequency of the wind power plant meets a preset relative difference value; the absolute difference value judgment submodule judges whether the absolute difference value of the frequency change of the bus frequency of the wind power plant accords with a preset absolute difference value or not, and the change slope judgment submodule judges whether the frequency change slope of the bus frequency of the wind power plant accords with a preset change slope or not;
secondly, when the bus frequency of the wind power plant changes suddenly, the high-frequency discrimination module 212 judges whether the bus frequency of the wind power plant is high-frequency; the triggering module 221 sends a timing triggering signal when the bus frequency of the wind farm changes suddenly, so that the timing module 222 times the out-of-limit time of the bus frequency of the wind farm according to the timing triggering signal to obtain the out-of-limit bus time t of the wind farm, and optionally, the high-frequency judging module 212 and the triggering module 221 can work in parallel;
thirdly, the state judgment module 31 determines that the bus frequency of the wind power plant is high frequency, and the bus out-of-limit time t of the wind power plant exceeds the reference out-of-limit time t0Determining that the bus frequency of the wind power plant is in a high-frequency out-of-limit state;
optionally, when the relative change difference of the bus frequency of the wind farm conforms to the preset relative difference, the absolute change difference of the frequency change of the bus frequency of the wind farm conforms to the preset absolute difference, and the frequency change slope of the bus frequency of the wind farm conforms to the preset change slope, at this time, the central processing unit 3 should confirm that the bus frequency of the wind farm is the high-frequency;
fourthly, the operation mode identification module 32 identifies the operation modes of all the units in the wind power plant, the time difference value calculation module 33 sets the bus out-of-limit time t of the wind power plant in the high-frequency out-of-limit state of the wind power plant as the bus high-frequency out-of-limit time t of the wind power plant, and the bus high-frequency out-of-limit time t of the wind power plant and the reference out-of-limit time t are used for calculating the time difference value0Obtaining an out-of-limit difference value delta t; wherein, t-t is0；
Optionally, the operation mode identification module 32 and the time difference value calculation module 33 may work in parallel;
and fifthly, the instruction generating module 32 generates a generator tripping control instruction for representing the generator tripping amount according to the unit operation mode and the out-of-limit difference value delta t in the wind power plant, and issues the generator tripping control instruction to the generator tripping control device 4, so that the generator tripping control device 4 can cut off the units in the wind power plant according to the generator tripping control instruction.
EXAMPLE III
Referring to fig. 7, the present invention provides a computer-readable medium for generating a computer-readable instruction, where the computer-readable medium is used to implement the functions of the central processing unit 3 in the second embodiment, and the computer-readable medium specifically includes: a processor 301, a memory 302, a transceiver 303, and a bus 304, the processor 301, the memory 302, and the transceiver 303 communicating with each other through the bus 304. The memory 302 stores a plurality of instructions to realize the generator tripping instruction generation method provided by the embodiment of the invention, the transceiver 303 receives a high-frequency out-of-limit analysis result sent by the high-frequency out-of-limit analysis unit 2, the processor judges whether the bus frequency of the wind farm is in a high-frequency out-of-limit state of the wind farm according to the high-frequency out-of-limit analysis result, and when the bus frequency of the wind farm is in the high-frequency out-of-limit state of the wind farm, the high-frequency out-of-limit time t of the bus of the wind farm is obtained according to the high-frequency out-of; generating a generator tripping control instruction representing a generator tripping amount according to the high-frequency out-of-limit time t of a bus of the wind power plant; the transceiver 303 further issues a generator tripping control instruction to the generator tripping control device 4, so that the generator tripping control device cuts off the units in the wind power plant according to the generator tripping control instruction.
Further, the transceiver 303 receives the frequency determination result sent by the high-frequency determination module 212, receives the bus out-of-limit time t of the wind farm sent by the timing module 222, and receives the operation signal sent by each unit in the wind farm;
the processor 301 determines whether the wind farm bus frequency is the high-frequency according to the frequency determination result sent by the high-frequency determination module 212, and if the wind farm bus frequency is the high-frequency, the bus out-of-limit time t of the wind farm exceeds the reference out-of-limit time t0Determining that the bus frequency of the wind power plant is in a high-frequency out-of-limit state, setting the bus out-of-limit time t of the wind power plant in the high-frequency out-of-limit state of the wind power plant as the bus high-frequency out-of-limit time t of the wind power plant, and according to the bus high-frequency out-of-limit time t of the wind power plant and the reference out-of-limit time t0Obtaining an out-of-limit difference value delta t, and generating a generator tripping control instruction representing the generator tripping amount according to the running mode of the generator set in the wind power plant and the out-of-limit difference value delta t; wherein, t-t is0。
The processor 301 according to the embodiment of the present invention may be a single processor, or may be a general term for multiple processing elements. For example, the processor 301 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to implement embodiments of the present invention, such as: one or more microprocessors (digital signal processors, DSP for short), or one or more Field programmable gate arrays (FPGA for short).
The memory 302 may be a single storage device or a combination of storage elements, and is used for storing executable program codes and the like. And the memory 302 may include a Random Access Memory (RAM) and may also include a non-volatile memory (non-volatile memory), such as a magnetic disk memory, Flash memory (Flash), etc.
The bus 304 may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. The bus 304 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 7, but this is not intended to represent only one bus or type of bus.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus embodiment, since it is substantially similar to the method embodiment, it is relatively simple to describe, and reference may be made to some descriptions of the method embodiment for relevant points.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (8)
1. A wind power high-frequency generator tripping control method is characterized by comprising the following steps:
measuring the bus frequency of a wind power plant, and carrying out high-frequency out-of-limit analysis on the bus frequency of the wind power plant;
when the bus frequency of the wind power plant is in the high-frequency out-of-limit state of the wind power plant, obtaining the bus high-frequency out-of-limit time t of the wind power plant according to the high-frequency out-of-limit state of the wind power plant;
generating a generator tripping control instruction representing a generator tripping amount according to the high-frequency out-of-limit time t of the bus of the wind power plant; issuing a cutting machine control instruction to a cutting machine control device, and enabling the cutting machine control device to cut off the units in the wind power plant according to the cutting machine control instruction;
the method for carrying out high-frequency out-of-limit analysis on the bus frequency of the wind power plant comprises the following steps:
judging whether the bus frequency of the wind power plant reaches the mutation frequency;
when the bus frequency of the wind power plant changes suddenly, timing the out-of-limit time of the bus frequency of the wind power plant to obtain the bus out-of-limit time t of the wind power plant;
judging whether the bus frequency of the wind power plant is a high-frequency;
when the bus frequency of the wind power plant is high-frequency, the bus out-of-limit time t of the wind power plant exceeds the reference out-of-limit time t0Determining that the bus frequency of the wind power plant is in a high-frequency out-of-limit state of the wind power plant, and setting the bus out-of-limit time t of the wind power plant in the high-frequency out-of-limit state of the wind power plant as the bus high-frequency out-of-limit time t of the wind power plant; the method for judging whether the bus frequency of the wind power plant is the high-frequency comprises the following steps: judging whether the relative difference value of the change of the bus frequency of the wind power plant meets a preset relative difference value or not, judging whether the absolute difference value of the frequency change of the bus frequency of the wind power plant meets a preset absolute difference value or not, and judging whether the frequency change slope of the bus frequency of the wind power plant meets a preset change slope or not;
and when the change relative difference of the bus frequency of the wind power plant accords with a preset relative difference, the absolute difference of the frequency change of the bus frequency of the wind power plant accords with a preset absolute difference, and the frequency change slope of the bus frequency of the wind power plant accords with a preset change slope, the bus frequency of the wind power plant is high-frequency.
2. The wind power high-frequency generator tripping control method according to claim 1, wherein the method for measuring the bus frequency of the wind farm comprises the following steps:
and measuring the electrical data reflecting the frequency characteristic of the wind power plant, and obtaining the bus frequency of the wind power plant according to the electrical data reflecting the frequency characteristic of the wind power plant.
3. The wind power high-frequency generator tripping control method according to claim 1, wherein the method for generating generator tripping control instructions representing generator tripping amount according to the bus high-frequency out-of-limit time t of the wind power plant comprises the following steps:
according to the bus high-frequency out-of-limit duration t of the wind power plant and the reference out-of-limit duration t0Obtaining an out-of-limit difference value delta t; wherein, t-t is0；
Generating a cutting machine control instruction representing the cutting machine amount according to the out-of-limit difference value delta t; and the larger the out-of-limit difference value delta t is, the larger the cutting machine control instruction represents the cutting machine quantity.
4. The wind power high-frequency generator tripping control method according to claim 3, wherein the method for generating the generator tripping control command representing the generator tripping amount according to the bus high-frequency out-of-limit time t of the wind farm further comprises the following steps: and identifying the operation mode of each unit in the wind power plant, and generating a generator tripping control instruction representing the generator tripping amount according to the operation mode of the units in the wind power plant and the out-of-limit difference value delta t.
5. The utility model provides a wind-powered electricity generation high frequency cutter controlling means which characterized in that includes: the system comprises a phasor measurement unit, a high-frequency out-of-limit analysis unit and a central processing unit connected with the input end of a cutter control device; the output end of the phasor measurement unit is connected with the input end of the central processing unit through a high-frequency out-of-limit analysis unit;
the phasor measurement unit is used for measuring the bus frequency of the wind power plant;
the high-frequency out-of-limit analysis unit is used for carrying out high-frequency out-of-limit analysis on the bus frequency of the wind power plant;
the central processing unit is used for obtaining the high-frequency out-of-limit time t of the bus of the wind power plant according to the high-frequency out-of-limit state of the wind power plant when the bus frequency of the wind power plant is in the high-frequency out-of-limit state of the wind power plant, generating a tripping control instruction representing a tripping amount according to the high-frequency out-of-limit time t of the bus of the wind power plant, and issuing a tripping control instruction to the tripping control device to enable the tripping control device to cut off the units in the wind power plant according to the tripping control instruction;
the high-frequency out-of-limit analysis unit comprises a high-frequency identification module and a mutation timing module; the input end of the high-frequency identification module is connected with the output end of the phasor measurement unit, and the output end of the high-frequency identification module is respectively connected with the input end of the central processing unit and the input end of the mutation timing module; the output end of the mutation timing module is connected with the input end of the central processing unit;
the high-frequency identification module is used for judging whether the bus frequency of the wind power plant reaches the mutation frequency or not, and judging whether the bus frequency of the wind power plant is the high-frequency or not when the bus frequency of the wind power plant is mutated;
the sudden change timing module is used for timing the out-of-limit time of the bus frequency of the wind power plant when the bus frequency of the wind power plant is suddenly changed to obtain the bus out-of-limit time t of the wind power plant;
the central processing unit is also used for determining the bus out-of-limit time t of the wind power plant when the bus frequency of the wind power plant is high-frequency and the bus out-of-limit time t of the wind power plant exceeds the reference out-of-limit time t0Then, determining that the bus frequency of the wind power plant is in a high-frequency out-of-limit state, and setting the bus out-of-limit time t of the wind power plant in the high-frequency out-of-limit state of the wind power plant asThe bus high-frequency out-of-limit time t of the wind power plant;
the high-frequency identification module comprises a high-frequency discrimination module, and the high-frequency discrimination module comprises a relative difference value discrimination submodule, an absolute difference value discrimination submodule and a change slope discrimination submodule; the output end of the relative difference value judging submodule, the output end of the absolute difference value judging submodule and the output end of the change slope judging submodule are respectively connected with the input end of the central processing unit;
the relative difference value judging submodule is used for judging whether the change relative difference value of the bus frequency of the wind power plant meets a preset relative difference value or not;
the absolute difference value judging submodule is used for judging whether the absolute difference value of the frequency change of the bus frequency of the wind power plant meets a preset absolute difference value or not;
the change slope judgment submodule is used for judging whether the frequency change slope of the bus frequency of the wind power plant meets a preset change slope or not;
the central processing unit is used for confirming that the bus frequency of the wind power plant is the high-frequency when the change relative difference value of the bus frequency of the wind power plant accords with a preset relative difference value, the absolute difference value of the frequency change of the bus frequency of the wind power plant accords with a preset absolute difference value, and the frequency change slope of the bus frequency of the wind power plant accords with a preset change slope.
6. The wind power high-frequency generator tripping control device according to claim 5, wherein the high-frequency identification module further comprises a frequency sudden change detection module; the sudden change timing module comprises a trigger module and a timing module; the input end of the frequency mutation detection module is connected with the output end of the phasor measurement unit, the input end of the relative difference value judgment sub-module, the input end of the absolute difference value judgment sub-module and the input end of the change slope judgment sub-module are respectively connected with the output end of the frequency mutation detection module, the output end of the frequency mutation detection module is connected with the input end of the trigger module, the trigger module is connected with the input end of the timing module, and the output end of the timing module is respectively connected with the input end of the central processing unit;
the frequency mutation detection module is used for judging whether the bus frequency of the wind power plant reaches mutation frequency;
the trigger module is used for sending a timing trigger signal when the bus frequency of the wind power plant changes suddenly;
the timing module is used for timing the out-of-limit time of the bus frequency of the wind power plant according to the timing trigger signal to obtain the bus out-of-limit time t of the wind power plant.
7. The wind power high-frequency generator control device according to claim 5, wherein the central processing unit comprises a state judgment module, a time difference value calculation module and an instruction generation module; the output end of the high-frequency identification module and the output end of the sudden change timing module are respectively connected with the input end of the state judgment module, the output end of the state judgment module is connected with the input end of the instruction generation module through a time difference value calculation module, and the output end of the instruction generation module is connected with the input end of the cutter control device;
the state judgment module is used for judging whether the bus frequency of the wind power plant is high-frequency or not, and judging whether the bus out-of-limit time of the wind power plant exceeds the reference out-of-limit time t or not0Determining that the bus frequency of the wind power plant is in a high-frequency out-of-limit state;
the time difference value calculation module is used for setting the bus high-frequency out-of-limit time t of the wind power plant in the high-frequency out-of-limit state of the wind power plant as the bus high-frequency out-of-limit time t of the wind power plant, and according to the bus high-frequency out-of-limit time t of the wind power plant and the reference out-of-limit time t0Obtaining an out-of-limit difference value delta t; wherein, t-t is0；
The instruction generating module is used for generating a cutting machine control instruction representing the cutting machine amount according to the out-of-limit difference value delta t, and issuing the cutting machine control instruction to the cutting machine control device, so that the cutting machine control device can cut off the units in the wind power plant according to the cutting machine control instruction; and the larger the out-of-limit difference value delta t is, the larger the cutting machine control instruction represents the cutting machine quantity.
8. The wind power high-frequency generator tripping control device according to claim 7, wherein the central processing unit further comprises an operation mode identification module for connecting with each unit in the wind farm, and an output end of the operation mode identification module is connected with an input end of the instruction generation module;
the operation mode identification module is used for identifying the operation mode of each unit in the wind power plant;
the instruction generating module is used for generating a machine cutting control instruction representing the machine cutting amount according to the unit operation mode in the wind power plant and the out-of-limit difference value delta t.
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