CN109672209B - Wind turbine generator control method and system based on power grid state - Google Patents
Wind turbine generator control method and system based on power grid state Download PDFInfo
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- CN109672209B CN109672209B CN201710958998.XA CN201710958998A CN109672209B CN 109672209 B CN109672209 B CN 109672209B CN 201710958998 A CN201710958998 A CN 201710958998A CN 109672209 B CN109672209 B CN 109672209B
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- 238000010248 power generation Methods 0.000 claims description 4
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
Abstract
The invention discloses a wind turbine generator control method and system based on a power grid state, wherein the method comprises the following steps: the method comprises the steps that a specific state point of a power grid is predetermined according to power grid parameters, and an operation protection limit value of a wind turbine generator set under the specific state point is determined; the number of the specific state points is at least two; when the wind turbine generator is controlled, acquiring power grid parameters at the current moment, when the power grid parameters at the current moment are between two adjacent specific state points, performing interpolation calculation according to the power grid parameters at the two adjacent specific state points and the operation parameters of the wind turbine generator in a corresponding state to determine an operation protection limit value of the wind turbine generator at the current moment, and performing protection control on the operation of the wind turbine generator according to the operation protection limit value. The method has the advantages that the wind turbine generator designed according to rated power grid conditions can be ensured to run safely and stably under the condition of power grid fluctuation, the economy and the competitiveness of the wind turbine generator are improved, and the like.
Description
Technical Field
The invention relates to the field of wind power control, in particular to a wind turbine generator control method based on a power grid state.
Background
In the control of the wind turbine generator of the wind power plant, the requirement of the design standard of the wind turbine generator on the capability of the wind turbine generator adapting to a power grid is as follows: voltage adaptation range: (1 ± 10%) UN(UNRated voltage of the wind turbine generator); frequency adaptation range: (1 ± 5%). fN(fNThe rated frequency of the wind turbine). In practical situations, however, the fluctuation amplitude and the fluctuation amplitude of the frequency of the grid voltage of the wind power plants in different regionsThe values are different, and in addition, the grid fluctuation may be intermittent fluctuation, so if the wind turbine generators are all designed and selected according to the grid adaptability capability requirement specified by the standard, the allowance may be large in the actual operation process of the wind turbine generators, and the COE of the wind turbine generators may be high. Therefore, the problems that the wind turbine generator has certain potential safety hazards under the condition of power grid fluctuation, the stability is not high and the like are caused.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the technical problems in the prior art, the invention provides the wind turbine control method and the wind turbine control system based on the power grid state, which can ensure that the wind turbine designed according to the rated power grid condition can safely and stably run under the condition of power grid fluctuation, and improve the economy and the competitiveness of the wind turbine.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a wind turbine generator control method based on a power grid state is characterized in that a specific state point of a power grid is predetermined according to power grid parameters, and an operation protection limit value of a wind turbine generator under the specific state point is determined; the number of the specific state points is at least two; when the wind turbine generator is controlled, acquiring power grid parameters at the current moment, when the power grid parameters at the current moment are between two adjacent specific state points, performing interpolation calculation according to the power grid parameters at the two adjacent specific state points and the operation parameters of the wind turbine generator in a corresponding state to determine an operation protection limit value of the wind turbine generator at the current moment, and performing protection control on the operation of the wind turbine generator according to the operation protection limit value.
Further, the grid parameters include an operating voltage and a grid frequency of the grid; the operating parameters of the wind turbine generator set comprise operating rotating speed.
Further, the specific state point includes: a first limit point determined by the minimum continuous operation voltage and the minimum continuous operation frequency of the power grid; and a second limit point determined by the maximum continuous operation voltage and the maximum continuous operation frequency of the power grid.
Further, the specific state point further includes: rated point determined by the rated voltage and rated frequency of the grid.
Further, the interpolation calculation is a linear interpolation calculation.
Further, the operation protection limit value comprises a low-speed protection limit value and/or a high-speed protection limit value; the low speed protection limits include: a minimum operating speed or a minimum protection speed; the high speed protection limit includes: the highest operating speed or the highest protection speed.
And further, when the power grid parameters at the current moment are not between two specific state points, controlling the wind turbine generator to perform protection shutdown.
And further, the wind turbine generator is divided into different wind speed intervals according to the wind speed value, and the wind turbine generator control method based on the power grid state is independently operated in the different wind speed intervals.
Further, the wind speed interval comprises a low wind speed interval and a high wind speed interval; the operation protection limit value in the low wind speed interval is a low speed protection limit value; and the operation protection limit value in the high wind speed interval is a high-speed protection limit value.
A wind turbine generator control system based on a power grid state comprises a control computer, wherein the control computer loads and can execute a program of the control method.
Compared with the prior art, the invention has the advantages that:
1. the invention can ensure that the wind turbine generator designed according to the rated power grid condition can safely and stably operate under the condition of power grid fluctuation, and improves the economy and competitiveness of the wind turbine generator.
2. The invention conditionally expands the operating rotating speed range of the wind turbine generator and improves the generating capacity of the wind turbine generator at a low wind speed section.
3. According to the invention, in the aspect of designing key electrical components of the wind turbine generator, the design can be carried out according to the rated working condition instead of the extreme power grid working condition, so that the cost of the components can be reduced.
Drawings
FIG. 1 is a schematic flow chart of an embodiment of the present invention.
Fig. 2 is a schematic diagram of a relationship between the minimum operating speed of the wind turbine generator and the grid voltage according to the embodiment of the present invention.
Fig. 3 is a schematic diagram of a relationship between the minimum operating rotational speed and the frequency of the wind turbine generator according to the embodiment of the present invention.
Fig. 4 is a schematic diagram of a relationship between a maximum protection rotation speed of a wind turbine generator and a grid voltage according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of a relationship between a maximum protection rotation speed and a frequency of a wind turbine generator according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and specific preferred embodiments of the description, without thereby limiting the scope of protection of the invention.
The wind turbine generator control method based on the power grid state is divided into a low wind speed interval and a high wind speed interval according to the size of wind speed. The low wind speed interval and the high wind speed interval will be described separately.
The first embodiment is as follows: in the low wind speed interval, the low wind speed value can be set as the wind speed division value of the low wind speed section according to the actual situation. As shown in fig. 1, in this embodiment, a specific state point of a power grid is predetermined according to a power grid parameter, and an operation protection limit value of a wind turbine generator set at the specific state point is determined; the number of the specific state points is at least two; when the wind turbine generator is controlled, acquiring power grid parameters at the current moment, when the power grid parameters at the current moment are between two adjacent specific state points, performing interpolation calculation according to the power grid parameters at the two adjacent specific state points and the operation parameters of the wind turbine generator in a corresponding state to determine an operation protection limit value of the wind turbine generator at the current moment, and performing protection control on the operation of the wind turbine generator according to the operation protection limit value.
In this embodiment, the grid parameters include an operating voltage and a grid frequency of the grid; the operating parameters of the wind turbine generator set comprise operating rotating speed. The specific state points include: a first limit point determined by the minimum continuous operation voltage and the minimum continuous operation frequency of the power grid; and a second limit point determined by the maximum continuous operation voltage and the maximum continuous operation frequency of the power grid.
In this embodiment, at the first limit point, when the minimum continuous operation voltage of the power grid is UminMinimum continuous operating frequency of fminThe low-speed protection limit value of the wind turbine generator is n1min(ii) a At the second limit point, when the maximum continuous operation voltage of the power grid is UmaxMaximum continuous operating frequency of fmaxThe low-speed protection limit value of the wind turbine generator is n2min. The low-speed protection limit value is the lowest operation rotation speed or the lowest protection rotation speed, and the lowest operation rotation speed is selected in the embodiment. At the moment, according to the operation voltage of the first limit point and the second limit point and the low-speed protection limit value of the wind generating set, a relation schematic diagram between the lowest operation rotating speed and the power grid voltage can be generated; and generating a relation schematic diagram between the lowest operation rotating speed and the frequency according to the operation frequency of the first limit point and the second limit point and the low-speed protection limit value of the wind generating set. Then, when the wind turbine generator is controlled, by acquiring the power grid parameters at the current moment, including the operating voltage U and the frequency f, for any condition that U is metmin<U<UmaxThe operating voltage U of the wind turbine generator set can be calculated by linear interpolation to obtain the lowest operating rotating speed value n of the wind turbine generator set1For any satisfaction of fmin<f<fmaxThe frequency f of the wind turbine generator can be calculated by linear interpolation to obtain the lowest running rotating speed value n of the wind turbine generator 2(ii) a Then passes through the lowest operation rotating speed value n1And a minimum operating speed value n2The lowest operation rotating speed value n of the wind turbine generator corresponding to the power grid state at the current moment can be obtained through calculation. In the present embodiment, by formula (1): n is M + an1+bn2And calculating the lowest running rotating speed value n of the wind turbine generator, wherein M is a preset value, and a and b are preset proportionality coefficients respectively. When the power grid parameter is not between two specific state points at the current moment, namely when the operating voltage U of the power grid does not meet Umin<U<UmaxOr the frequency f of the network does not satisfy fmin<f<fmaxAnd controlling the wind turbine generator to perform protection shutdown.
In this embodiment, to increase the accuracy of the calculated minimum operating speed value, a state point is specifiedFurther comprising: rated point determined by the rated voltage and rated frequency of the grid. At rated point, when the operating voltage of the power grid is UNFrequency of fNThe low-speed protection limit value of the wind turbine generator is nmin. At this time, a schematic diagram of a relationship between the lowest operation rotation speed and the grid voltage is shown in fig. 2, and a schematic diagram of a relationship between the lowest operation rotation speed and the frequency is shown in fig. 3. At this time, the operating voltage is divided into two sections, [ U ]min,UN]And [ U ]N,Umax]The frequency is also divided into two intervals, [ f ]min,fN]And [ fN,fmax]For the power grid parameters in the two intervals, the lowest operation rotating speed value n of the wind power generation set can be obtained through linear interpolation calculation respectively by the same method as the method 1And n2And then calculating the lowest running rotating speed value n of the wind turbine generator set through a formula (1). Of course, it should be noted that more specific status points may be set as needed.
The wind turbine generator control system based on the power grid state comprises a control computer, and the control computer loads and can execute the program of the control method.
Example two: in the high wind speed interval, the high wind speed value can be set as the wind speed division value of the high wind speed section according to the actual situation. As shown in fig. 1, in this embodiment, a specific state point of a power grid is predetermined according to a power grid parameter, and an operation protection limit value of a wind turbine generator set at the specific state point is determined; the number of the specific state points is at least two; when the wind turbine generator is controlled, acquiring power grid parameters at the current moment, when the power grid parameters at the current moment are between two adjacent specific state points, performing interpolation calculation according to the power grid parameters at the two adjacent specific state points and the operation parameters of the wind turbine generator in a corresponding state to determine an operation protection limit value of the wind turbine generator at the current moment, and performing protection control on the operation of the wind turbine generator according to the operation protection limit value.
In this embodiment, the grid parameters include an operating voltage and a grid frequency of the grid; the operating parameters of the wind turbine generator set comprise operating rotating speed. The specific state points include: a first limit point determined by the minimum continuous operation voltage and the minimum continuous operation frequency of the power grid; and a second limit point determined by the maximum continuous operation voltage and the maximum continuous operation frequency of the power grid.
In this embodiment, at the first limit point, when the minimum continuous operation voltage of the power grid is UminMinimum continuous operating frequency of fminThe high-speed protection limit value of the wind turbine generator is n1max(ii) a At the second limit point, when the maximum continuous operation voltage of the power grid is UmaxMaximum continuous operating frequency of fmaxThe high-speed protection limit value of the wind turbine generator is n2max. The high-speed protection limit value is the highest operation rotating speed or the highest protection rotating speed, and the highest operation rotating speed is selected in the embodiment. At the moment, according to the operation voltage of the first limit point and the second limit point and the high-speed protection limit value of the wind generating set, a relation schematic diagram between the highest operation rotating speed and the power grid voltage can be generated; and generating a relation schematic diagram between the highest operation rotating speed and the frequency according to the operation frequency of the first limit point and the second limit point and the high-speed protection limit value of the wind generating set. Then, when the wind turbine generator is controlled, by acquiring the power grid parameters at the current moment, including the operating voltage U and the frequency f, for any condition that U is met min<U<UmaxThe operating voltage U can be calculated by linear interpolation to obtain the highest operating rotating speed value n of the wind turbine generator1For any satisfy fmin<f<fmaxThe frequency f of the wind turbine generator can be calculated by linear interpolation to obtain the highest running rotating speed value n of the wind turbine generator2(ii) a Then passing through the highest operation rotating speed value n1And the maximum operating speed value n2The maximum operation rotating speed value n of the wind turbine generator corresponding to the power grid state at the current moment can be obtained through calculation. In the present embodiment, by formula (2): n is M + an1+bn2And calculating the highest running rotating speed value n of the wind turbine generator, wherein M is a preset value, and a and b are preset proportionality coefficients respectively. When the power grid parameter is not between two specific state points at the current moment, namely when the operating voltage U of the power grid does not meet Umin<U<UmaxOr the frequency f of the network does not satisfy fmin<f<fmaxAnd controlling the wind turbine generator to perform protection shutdown.
In this embodiment, in order to increase the accuracy of the calculated maximum operating speed value, the specific state point further comprises: rated point determined by the rated voltage and rated frequency of the grid. At rated point, when the operating voltage of the grid is UNFrequency of fNThe high-speed protection limit value of the wind turbine generator is nmax. At this time, a schematic diagram of a relationship between the maximum operation rotation speed and the grid voltage is shown in fig. 4, and a schematic diagram of a relationship between the maximum operation rotation speed and the frequency is shown in fig. 5. At this time, the operating voltage is divided into two sections, [ U ] min,UN]And [ U ]N,Umax]The frequency is also divided into two intervals, [ f ]min,fN]And [ fN,fmax]For the power grid parameters in the two intervals, the highest operation rotating speed value n of the wind power generation set can be obtained through linear interpolation calculation respectively by the same method as the method1And n2And then calculating the lowest running rotating speed value n of the wind turbine generator set through a formula (2). Of course, it should be noted that more specific status points may be set as needed.
The wind turbine generator control system based on the power grid state comprises a control computer, and the control computer loads and can execute the program of the control method.
The foregoing is considered as illustrative of the preferred embodiments of the invention and is not to be construed as limiting the invention in any way. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention, unless the technical essence of the present invention departs from the content of the technical solution of the present invention.
Claims (8)
1. A wind turbine generator control method based on a power grid state is characterized in that: the method comprises the steps that a specific state point of a power grid is predetermined according to power grid parameters, and an operation protection limit value of a wind turbine generator set under the specific state point is determined; the number of the specific state points is at least two; when the wind turbine generator is controlled, acquiring power grid parameters at the current moment, when the power grid parameters at the current moment are positioned between two adjacent specific state points, performing interpolation calculation according to the power grid parameters at the two adjacent specific state points and the operation parameters of the wind turbine generator in a corresponding state to determine the operation protection limit value of the wind turbine generator at the current moment, and performing protection control on the operation of the wind turbine generator according to the operation protection limit value, wherein the power grid parameters comprise the operation voltage and the power grid frequency of a power grid; the operation parameters of the wind turbine generator set comprise operation rotating speed, and the specific state points comprise: a first limit point determined by the minimum continuous operation voltage and the minimum continuous operation frequency of the power grid; and a second limit point determined by the maximum continuous operation voltage and the maximum continuous operation frequency of the power grid.
2. The grid state-based wind turbine control method according to claim 1, wherein: the specific state point further comprises: rated point determined by the rated voltage and rated frequency of the grid.
3. The grid state-based wind turbine control method according to claim 2, characterized in that: the interpolation calculation is a linear interpolation calculation.
4. The grid state-based wind turbine control method according to claim 3, characterized in that: the operation protection limit value comprises a low-speed protection limit value and/or a high-speed protection limit value; the low speed protection limits include: a minimum operating speed or a minimum protection speed; the high speed protection limit includes: the highest operating speed or the highest protection speed.
5. The grid state-based wind turbine control method according to claim 4, characterized in that: and when the power grid parameters at the current moment are not between the two specific state points, controlling the wind turbine generator to carry out protective shutdown.
6. The grid state-based wind turbine control method according to any one of claims 1 to 5, characterized in that: and dividing the wind power generation set into different wind speed intervals according to the wind speed value, and independently operating the wind power generation set control method based on the power grid state in the different wind speed intervals.
7. The grid state-based wind turbine control method according to claim 6, characterized in that: the wind speed interval comprises a low wind speed interval and a high wind speed interval; the operation protection limit value in the low wind speed interval is a low speed protection limit value; and the operation protection limit value in the high wind speed interval is a high-speed protection limit value.
8. The utility model provides a wind turbine generator system control system based on electric wire netting state which characterized in that: comprising a control computer which loads and executes a program of the control method according to any one of claims 1 to 7.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101806282A (en) * | 2010-03-08 | 2010-08-18 | 江苏省电力试验研究院有限公司 | Optimized wind power utilization-based low rated wind speed wind power generation control system |
| CN102222938A (en) * | 2011-06-22 | 2011-10-19 | 中国农业大学 | Voltage-frequency comprehensive control method for direct-drive wind generator set |
| CN105545590A (en) * | 2015-12-19 | 2016-05-04 | 湘电风能有限公司 | Wind generating set control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP2781737B1 (en) * | 2011-11-16 | 2018-07-25 | Mitsubishi Heavy Industries, Ltd. | Wind power generation system and method for controlling same |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101806282A (en) * | 2010-03-08 | 2010-08-18 | 江苏省电力试验研究院有限公司 | Optimized wind power utilization-based low rated wind speed wind power generation control system |
| CN102222938A (en) * | 2011-06-22 | 2011-10-19 | 中国农业大学 | Voltage-frequency comprehensive control method for direct-drive wind generator set |
| CN105545590A (en) * | 2015-12-19 | 2016-05-04 | 湘电风能有限公司 | Wind generating set control method |
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