CN111720265B - Wind power generator set comprising multiple windings, control method thereof and control device thereof - Google Patents
Wind power generator set comprising multiple windings, control method thereof and control device thereof Download PDFInfo
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- CN111720265B CN111720265B CN201910218022.8A CN201910218022A CN111720265B CN 111720265 B CN111720265 B CN 111720265B CN 201910218022 A CN201910218022 A CN 201910218022A CN 111720265 B CN111720265 B CN 111720265B
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- 238000004804 winding Methods 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000010248 power generation Methods 0.000 claims abstract description 33
- 238000013461 design Methods 0.000 claims description 28
- 238000004590 computer program Methods 0.000 claims description 8
- 238000011161 development Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
- Y02E10/72—Wind turbines with rotation axis in wind direction
Abstract
A wind power generating set including multiple windings, a control method thereof, and a control device thereof are provided. A method of controlling a wind power generation set comprising a plurality of windings, the method comprising: determining the maximum output power of the wind generating set based on the number of windings in normal operation at present; determining a speed-torque curve corresponding to the maximum outputtable power; and controlling the operation of the wind generating set based on the determined rotation speed-torque curve.
Description
Technical Field
The present invention relates to the field of wind power generation, and more particularly, to a wind power generation set including multiple windings, a control method thereof, and a control apparatus thereof.
Background
Wind energy is a clean renewable resource, and its use is increasingly gaining attention in countries around the world. With the development of the world energy crisis, wind power generation by using a wind generating set comprising multiple windings has become a hot spot for social development.
However, the multi-winding wind generating set brings high power output and has high fault probability. At present, when any winding of the multi-winding wind generating set fails, the set needs to be shut down to cut out a power grid, the running can be continued after the maintenance of the failed winding is completed, and the availability and the generating capacity of the set are zero during the failure, so that the performance of the set is reduced. Therefore, how to improve the performance (such as availability, power generation, stability, etc.) of a wind turbine generator set when a set winding fails remains a challenge.
Disclosure of Invention
The invention aims to provide a wind generating set comprising multiple windings, a control method and a control device thereof.
An aspect of the present invention provides a control method of a wind power generation set including a plurality of windings, the method comprising: when at least one winding fails, determining the maximum outputtable power of the wind generating set based on the number of the windings which are normally operated at present; determining a speed-torque curve corresponding to the maximum outputtable power; and controlling the operation of the wind generating set based on the determined rotation speed-torque curve.
Optionally, the step of determining a speed-torque curve corresponding to the maximum outputtable power comprises: and determining a rotating speed-torque curve corresponding to the maximum output power based on the maximum output power and a designed rotating speed-torque curve of the wind generating set, wherein the designed rotating speed-torque curve comprises a first cut-in rotating speed section, a first variable rotating speed section and a first rated rotating speed section.
Optionally, the step of determining a speed-torque curve corresponding to the maximum outputtable power based on the maximum outputtable power and a design speed-torque curve includes: determining a point corresponding to the maximum outputtable power as a first control point; and determining a rotating speed-torque curve corresponding to the maximum output power based on the position of the torque corresponding to the first control point in a designed rotating speed-torque curve.
Optionally, the step of determining the rotation speed-torque curve corresponding to the maximum outputtable power based on the position of the torque corresponding to the first control point in the design rotation speed-torque curve includes: when the torque corresponding to the first control point is in the first rated rotation speed section, the rotation speed-torque curve corresponding to the maximum output power comprises the first cut-in rotation speed section, the first variable rotation speed section and a second rated rotation speed section, wherein the second rated rotation speed section comprises a connecting line from the end point of the first variable rotation speed section to the first control point.
Optionally, the step of determining the rotation speed-torque curve corresponding to the maximum outputtable power based on the position of the torque corresponding to the first control point in the design rotation speed-torque curve includes: when the torque corresponding to the first control point is in the first variable speed section, the speed-torque curve corresponding to the maximum output power comprises the first cut-in speed section and a second variable speed section, wherein the second variable speed section comprises a connecting line from the end point of the first cut-in speed section to the first control point.
Optionally, the step of determining the rotation speed-torque curve corresponding to the maximum outputtable power based on the position of the torque corresponding to the first control point in the design rotation speed-torque curve includes: when the torque corresponding to the first control point is in the first cut-in rotating speed section, a rotating speed-torque curve corresponding to the maximum output power comprises a third variable rotating speed section, wherein the third variable rotating speed section comprises a connecting line from the starting point of the first cut-in rotating speed section to the first control point.
Optionally, the step of determining the rotation speed-torque curve corresponding to the maximum outputtable power based on the position of the torque corresponding to the first control point in the design rotation speed-torque curve includes: when the torque corresponding to the first control point is in the first variable rotation speed section, determining a second control point on the first variable rotation speed section; determining a speed-torque curve corresponding to the maximum outputtable power based on the position of the torque corresponding to the second control point in a designed speed-torque curve; the rotation speed-torque curve corresponding to the maximum output power comprises the first cut-in rotation speed section, a fourth rotation speed section and a fifth rotation speed section, wherein the fourth rotation speed section comprises a connecting line from the end point of the first cut-in rotation speed section to the second control point, and the fifth rotation speed section comprises a connecting line from the second control point to the first control point.
Optionally, the step of controlling operation of the wind power generation set based on the determined speed-torque curve comprises: and determining a corresponding torque set value and/or a rotating speed torque value according to the rotating speed-torque curve, and controlling the operation of the wind generating set based on the torque set value and/or the rotating speed set value.
Optionally, the control method further includes: based on the determined speed-torque curve, a corresponding controller parameter is determined, which is preset.
The controller is a pitch controller and/or a torque controller.
An aspect of the present invention provides a wind turbine generator system, including: a plurality of windings; a control device configured to: when at least one winding fails, determining the maximum outputtable power of the wind generating set based on the number of windings which are currently in normal operation; determining a speed-torque curve corresponding to the maximum outputtable power; and controlling operation of the wind power generation unit based on the determined speed-torque curve.
Optionally, the control device is configured to: and determining a rotating speed-torque curve corresponding to the maximum output power based on the maximum output power and a designed rotating speed-torque curve of the wind generating set, wherein the designed rotating speed-torque curve comprises a first cut-in rotating speed section, a first variable rotating speed section and a first rated rotating speed section.
Optionally, the control device is configured to: determining a point corresponding to the maximum outputtable power as a first control point; and determining a rotating speed-torque curve corresponding to the maximum output power based on the position of the torque corresponding to the first control point in a designed rotating speed-torque curve.
Optionally, the control device is configured to: when the torque corresponding to the first control point is in the first rated rotation speed section, the rotation speed-torque curve corresponding to the maximum output power comprises the first cut-in rotation speed section, the first variable rotation speed section and a second rated rotation speed section, wherein the second rated rotation speed section comprises a connecting line from the end point of the first variable rotation speed section to the first control point.
Optionally, the control device is configured to: when the torque corresponding to the first control point is in the first variable speed section, the speed-torque curve corresponding to the maximum output power comprises the first cut-in speed section and a second variable speed section, wherein the second variable speed section comprises a connecting line from the end point of the first cut-in speed section to the first control point.
Optionally, the control device is configured to: when the torque corresponding to the first control point is in the first cut-in rotating speed section, a rotating speed-torque curve corresponding to the maximum output power comprises a third variable rotating speed section, wherein the third variable rotating speed section comprises a connecting line from the starting point of the first cut-in rotating speed section to the first control point.
Optionally, the control device is configured to: when the torque corresponding to the first control point is in the first variable rotation speed section, determining a second control point on the first variable rotation speed section; determining a rotation speed-torque curve corresponding to the maximum outputtable power based on the second control point, wherein the rotation speed-torque curve corresponding to the maximum outputtable power comprises the first cut-in rotation speed section, a fourth variable rotation speed section and a fifth variable rotation speed section, wherein the fourth variable rotation speed section comprises a connecting line from an end point of the first cut-in rotation speed section to the second control point, and the fifth variable speed section comprises a connecting line from the second control point to the first control point.
Optionally, the control device is configured to: and determining a corresponding torque set value and/or a rotating speed torque value according to the rotating speed-torque curve, and controlling the operation of the wind generating set based on the torque set value and/or the rotating speed set value.
Optionally, the control device is configured to: based on the determined speed-torque curve, a parameter of the respective controller is determined, which is preset.
Optionally, the controller is a pitch controller and/or a torque controller.
Another aspect of the invention provides a computer-readable storage medium storing a computer program which, when executed by a processor, implements any one of the control methods described above.
Another aspect of the present invention provides an apparatus for controlling a wind power generation set including a plurality of windings, comprising: one or more processors; a memory storing a computer program which, when executed by a processor, implements any of the control methods described above.
According to the wind generating set comprising multiple windings, the control method and the control device thereof, which are disclosed by the invention, firstly, the cut-out and shutdown of the wind generating set with multiple windings when the wind generating set is in fault are avoided, and the wind generating set can continuously generate power when the winding fault occurs; in addition, the method and the device can rapidly determine the rotating speed-torque curve suitable for the operation of the current wind generating set based on the number of windings in the current normal operation, and control the operation of the wind generating set based on the determined rotating speed-torque curve, so that the operation of the wind generating set is rapidly and stably controlled, and the generating performance of the wind generating set when winding faults occur is further improved.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 shows a flow chart of a control method of a wind power plant comprising multiple windings according to an embodiment of the present invention;
FIG. 2 shows a design speed-torque curve according to an embodiment of the invention;
FIG. 3 shows a graph of a speed-torque curve corresponding to maximum outputtable power, according to an embodiment of the present invention;
FIG. 4 shows a graph of a speed-torque curve corresponding to maximum outputtable power, according to an embodiment of the present invention;
FIG. 5 shows a graph of a speed-torque curve corresponding to maximum outputtable power, according to an embodiment of the present invention;
figure 6 shows a graph of the speed-torque curve corresponding to the maximum output power according to a preferred embodiment of the invention,
fig. 7 shows a wind power plant according to an embodiment of the invention.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
In the invention, when all windings and related systems included in the wind generating set work normally, the operation of the wind generating set is controlled based on the designed rotation speed-torque curve of the wind generating set. The design speed-torque curve can be any speed-torque curve designed for the wind generating set when all windings and related systems work normally, and the design method of the design speed-torque curve is not limited in any way.
Fig. 1 shows a flow chart of a control method of a wind power plant comprising multiple windings according to an embodiment of the invention.
Referring to fig. 1, in step S110, the maximum outputtable power of the wind turbine is determined based on the number of windings currently operating normally.
Here, the maximum outputtable power of the wind power unit may be determined as the rated power of the wind power unit when all windings included in the wind power unit are operating normally. In one example, when a winding fault occurs, the maximum outputtable power of the wind turbine may be determined based on the number of windings and the rated power, and the design speed-torque curve is calculated based on the maximum outputtable power (e.g., calculated by simulation, or referenced to a similar model speed-torque curve).
For example, the maximum outputtable power Pmax of the wind power plant may be determined by the following equation (1):
pmax=pr×n/M equation (1)
Pr=TrxWr equation (2)
Here, pmax indicates the maximum outputtable power of the wind turbine, N indicates the number of windings currently operating normally (i.e., normally operating windings that are not cut out), M indicates the number of windings of the wind turbine when no faulty winding is cut out, pr indicates the rated power of the wind turbine, tr indicates the rated torque of the wind turbine, and Wr indicates the rated rotational speed of the wind turbine.
In step S120, a rotational speed-torque curve corresponding to the maximum output power is determined.
In the present invention, the rotational speed-torque curve corresponding to the maximum outputtable power may be determined based on the maximum outputtable power and the designed rotational speed-torque curve of the wind turbine generator system. Preferably, the design speed-torque curve may be calculated by simulation based on the rated power of the wind power plant, and may include a first cut-in speed section, a first variable speed section, and a first rated speed section. The design speed-torque curve is further described below in conjunction with fig. 2.
Fig. 2 shows a design speed-torque curve according to an embodiment of the invention.
Although FIG. 2 shows a design speed-torque (T-W) curve for normal operation of the wind turbine. Note that while the design speed-torque curve shown in fig. 2 includes only line segments, this is merely exemplary, and the design speed-torque curve may also include a curve.
Referring to fig. 2, the design speed-torque curve may include a first cut-in speed segment, a first variable speed segment, and a first rated speed segment.
When the wind speed reaches the cut-in wind speed, the wind generating set is in grid-connected operation, and the wind generating set is controlled to operate according to the first cut-in rotating speed section (AB section). The wind generating set adopts a torque controller to control the rotating speed of the wind generating set, so that the wind generating set keeps running at the cut-in rotating speed (namely, the minimum rotating speed of the generator or the minimum rotating speed corresponding to the cut-in wind speed corresponds to the rotating speed of the point A in fig. 2).
When the wind speed continuously increases, the running of the wind generating set is controlled according to a first variable rotation speed section (BC section), the rotation speed of the wind generating set is continuously increased along with the increase of the wind speed at the stage, and the rotation speed of the wind generating set is controlled through a torque controller, so that the wind generating set runs at an optimal tip speed ratio, and the maximum wind energy capturing coefficient can be obtained under the current pitch angle, and at the same time, the wind energy utilization rate is highest under the same wind speed. Under this segment control, the torque setpoint output by the torque controller is determined according to equation (3):
torque t=kopt×w 2 Equation (3)
Where Kopt is the optimal gain and W is the rotational speed of the wind park.
When the rotation speed of the wind generating set reaches the maximum rotation speed, the operation of the wind generating set is controlled according to the first rated rotation speed section (CD section), and at the moment, the wind generating set is operated at the rated rotation speed Wr only by means of torque lifting because the rotation speed reaches the rated rotation speed Wr.
It will be appreciated that the design speed-torque curve of the present invention is not limited thereto, but may be any other existing speed-torque curve suitable for controlling a wind turbine generator set, obtained by other existing methods.
On the basis of this, a point corresponding to the maximum outputtable power may be determined as the first control point. Specifically, a point corresponding to the maximum outputtable power may be determined, and the point is used as a first control point, and further, the torque and the rotational speed corresponding to the first control point are determined on the designed rotational speed-torque curve, and it is understood that, because the first control point is the point corresponding to the maximum outputtable power, the torque corresponding to the first control point is the maximum torque corresponding to the maximum outputtable power, and the corresponding rotational speed is the rated rotational speed Wr of the wind generating set. Further, after the first control point is determined, a speed-torque curve corresponding to the maximum outputtable power may be determined based on a position of the torque corresponding to the first control point in the designed speed-torque curve. For example, the speed-torque curve corresponding to the maximum output power may comprise any form of connection from the start of operation of the wind power plant at the cut-in speed (corresponding to the speed of the point a in fig. 2) to the first control point. That is, different speed-torque curves may be determined by determining the first control point, thereby employing different control strategies based on the number of windings currently operating normally to enhance performance (e.g., stability, availability, power generation, etc.) of the wind turbine.
In one embodiment, determining the speed-torque curve corresponding to the maximum outputtable power based on the position of the torque corresponding to the first control point in the design speed-torque curve includes: when the torque corresponding to the first control point is in the first rated rotational speed section, the rotational speed-torque curve corresponding to the maximum outputtable power includes a first cut-in rotational speed section, a first variable rotational speed section, and a second rated rotational speed section, wherein the second rated rotational speed section includes a connection line from an end point of the first variable rotational speed section to the first control point. Here, the connection line may be any form of line (e.g., straight line, curved line, etc.). This embodiment will be described in more detail below in connection with the specific embodiment of fig. 3, however, this embodiment is not limited to the specific embodiment shown in fig. 3.
Fig. 3 shows a graph of a rotational speed versus torque curve corresponding to a maximum outputtable power according to an embodiment of the present invention.
In the embodiment of fig. 3, taking a four-winding set as an example, if one winding fault occurs, the remaining three sets can operate normally, and referring to equation (1), pmax=pr×3/4=0.75 Pr, and the corresponding maximum torque tn=0.75 Tr. At this time, since the point corresponding to the maximum output power is the E point, the E point is used as the first control point, and the torque (i.e., the maximum torque Tn) corresponding to the first control point can be determined on the ordinate corresponding to the E point, and the rotational speed (i.e., the rated rotational speed Wr of the wind turbine generator system) of the first control point can be determined on the abscissa. Referring to fig. 3, the position of the torque Tn corresponding to the first control point E is on the first rated rotational speed segment (CD segment) of the designed rotational speed-torque curve, so for the four-winding set, when one set of windings fails, the wind turbine generator set can still operate according to the original designed rotational speed-torque curve during the period from the point a to the rated rotational speed Wr, but due to the influence of the failed windings, after the maximum rated rotational speed Wr is reached, the wind turbine generator set cannot reach the original rated power Pr, but remains to operate at the point E as the torque reaches the maximum rated torque Tn. It can thus be determined that the speed-torque curve corresponding to the three sets of windings consists of AB, BC and CE segments.
The AB segment is a first cut-in rotation speed segment, and the wind generating set adopts a torque controller to control the rotation speed of the wind generating set, so that the wind generating set keeps running at the cut-in rotation speed (i.e. the minimum rotation speed of the generator or the minimum rotation speed corresponding to the cut-in wind speed corresponds to the rotation speed of the point a in fig. 2). The BC segment is a first variable rotation speed segment, and operates near the maximum Cp of the unit according to the formula T=Kopt×W2; the CE section is a second rated rotation speed section, and the wind generating set adopts a torque controller to control the rotation speed of the wind generating set to run near the rated rotation speed Wr; after the generating power of the wind generating set reaches the maximum output power Pmax (namely the first control point E), a variable pitch controller is adopted to adjust the blade angle so as to limit the absorption power of the impeller and control the rotating speed of the wind generating set to run near the rated rotating speed Wr.
In another embodiment, determining the speed-torque curve corresponding to the maximum outputtable power based on the position of the torque corresponding to the first control point in the designed speed-torque curve includes: when the torque corresponding to the first control point is in the first variable speed section, the speed-torque curve corresponding to the maximum output power comprises a first cut-in speed section and a second variable speed section, wherein the second variable speed section comprises a connecting line from the end point of the first cut-in speed section to the first control point. A specific embodiment of this preferred embodiment will be described in more detail below in connection with fig. 4, however, the preferred embodiment is not limited to the specific embodiment shown in fig. 4.
Fig. 4 shows a graph of a rotational speed versus torque curve corresponding to a maximum outputtable power according to an embodiment of the present invention.
In the embodiment of fig. 4, taking a four-winding set as an example, if two sets of winding faults occur, the remaining two sets can normally operate, and referring to equation (1), pmax=pr×2/4=0.5 Pr, and the corresponding maximum torque tn=0.5 Tr. At this time, since the point corresponding to the maximum output power is the point F, the point F is taken as the first control point, and the torque (i.e., the maximum torque Tn) corresponding to the first control point can be determined on the ordinate corresponding to the point F, and the rotational speed (i.e., the rated rotational speed Wr of the wind turbine generator system) of the first control point on the abscissa. Referring to fig. 4, the position of the torque Tn corresponding to the first control point F is on the first rated speed section of the designed speed-torque curve, so for a four-winding unit, if two sets of windings fail, the maximum outputtable power and the torque corresponding to the two sets of windings are half of the original rated values (rated power and rated torque), so that it cannot be guaranteed that the wind turbine unit is controlled to operate completely according to the original designed torque-torque curve, and under the same wind speed condition, the wind turbine unit cannot be controlled to operate according to the original designed speed-torque curve, so that the optimal tip speed ratio is always maintained to operate with the highest wind energy utilization. Therefore, in order to enable the wind turbine to continue to operate while two normal windings remain, the design speed-torque curve needs to be adjusted to control the operation of the wind turbine. As an example, the speed-torque curve corresponding to two normal windings includes an AB segment and a BF segment.
The AB segment is a first cut-in rotation speed segment, and the wind generating set adopts a torque controller to control the rotation speed of the wind generating set, so that the wind generating set keeps running at the cut-in rotation speed (i.e. the minimum rotation speed of the generator or the minimum rotation speed corresponding to the cut-in wind speed corresponds to the rotation speed of the point a in fig. 2). The BF section is a second variable rotation speed section, and as shown in the figure, the curve of the section is completely different from the first variable rotation speed section of the designed rotation speed-torque curve, and the fan is controlled to operate according to the second variable rotation speed section, so that the wind turbine generator set can continuously generate power when two sets of normal windings are remained, and meanwhile, the load stability of the wind turbine generator set is considered, so that the operation safety is ensured.
In yet another embodiment, determining the speed-torque curve corresponding to the maximum outputtable power based on the position of the torque corresponding to the first control point in the designed speed-torque curve includes: when the torque corresponding to the first control point is in the first cut-in rotational speed segment, the rotational speed-torque curve corresponding to the maximum outputtable power includes a third variable rotational speed segment, wherein the third variable rotational speed segment includes a connection line from the start point of the first cut-in rotational speed segment to the first control point. A specific embodiment of this preferred embodiment will be described in more detail below in connection with fig. 5, however, the preferred embodiment is not limited to the specific embodiment shown in fig. 5.
Fig. 5 shows a graph of a rotational speed versus torque curve corresponding to a maximum outputtable power according to an embodiment of the present invention.
In fig. 5, taking a four-winding set as an example, if three sets of winding faults occur, only one set can normally operate, and referring to equation (1), pmax=pr×1/4=0.25 Pr, and the corresponding maximum torque tn=0.25 Tr. At this time, since the point corresponding to the maximum output power is the H point, the H point is used as the first control point, and the torque (i.e., the maximum torque Tn) corresponding to the first control point can be determined on the ordinate corresponding to the H point, and the rotational speed (i.e., the rated rotational speed Wr of the wind turbine generator system) of the first control point can be determined on the abscissa. Referring to fig. 5, the position of the torque Tn corresponding to the first control point H is on the first cut-in rotational speed segment of the designed rotational speed-torque curve, so that the current wind turbine operation cannot be controlled according to the original designed rotational speed-torque curve, and the rotational speed-torque curve needs to be adjusted to enable the wind turbine to operate with the maximum output power under the corresponding wind condition. As an example, segment AH may be used as the adjusted speed-torque curve instead of the designed speed-torque curve. The wind generating set is controlled to operate according to the AH section, so that the wind generating set can control the rotating speed through the torque controller under the condition that one set of windings is remained, the wind generating set can continuously generate electricity, meanwhile, the load of the wind generating set is stable, and the operation safety is guaranteed.
In a preferred embodiment, the speed-torque curve corresponding to the maximum output power may be optimized for further improving the power generation performance of the wind park. Taking fig. 4 as an example, as described above, the rotation speed-torque curve corresponding to the maximum outputtable power includes two sections, namely, a first cut-in rotation speed section (AB section) and a second variable rotation speed section (BF section), where before the wind turbine generator reaches the maximum outputtable power (i.e., the power corresponding to the point F), the wind turbine generator can be controlled according to the first variable rotation speed section (BC section) of the design rotation speed-torque curve as much as possible, so that the wind turbine generator can maintain the optimal tip speed ratio for a period of time and operate with the highest wind energy utilization rate, thereby improving the power generation performance of the wind turbine generator. Because the current wind generating set is in a partial winding fault state and the designed rotating speed-torque curve is determined aiming at the operating state without winding faults, the operation of the wind generating set with winding faults cannot be controlled according to the designed rotating speed-torque curve all the time, and otherwise, the operation of the wind generating set is unstable. Therefore, while improving the power generation performance, in order to balance between the power generation amount and the operation stability of the wind turbine, a second control point G (as shown in fig. 6) is determined on the first variable rotation speed section (BC section). On the basis of this, a rotational speed/torque curve corresponding to the maximum output power can be determined on the basis of the second control point. As an example, the second control point G may be calculated by taking the load and the power generation amount of each operating point of the wind power generation set with the winding failure as constraint conditions. This preferred embodiment will be described in more detail below in connection with fig. 6, however, the preferred embodiment is not limited to the specific embodiment shown in fig. 6.
Fig. 6 shows a graph of a rotational speed-torque curve corresponding to the maximum output power according to a preferred embodiment of the present invention.
Referring to fig. 6, as an example, the optimized rotation speed-torque curve corresponding to the maximum outputtable power includes: a first cut-in speed segment (AB segment), a fourth variable speed segment (BG segment) and a fifth variable speed segment (BF segment), wherein the fourth variable speed segment includes a connection from an end point of the first cut-in speed segment to the second control point, and the fifth variable speed segment includes a connection from the second control point to the first control point. The fourth variable rotation speed section (BG section) coincides with the part of the first variable rotation speed section (BC section) of the designed rotation speed-torque curve, that is, the wind generating set can still operate with the highest wind energy utilization rate in the fourth variable rotation speed section, and the torque controller outputs torque to control the rotation speed in the fifth variable rotation speed section, so that the output power of the wind generating set gradually reaches the maximum outputtable power (i.e. the power corresponding to the point F) and keeps operating nearby. It can be appreciated that the second control point G is approximately close to the point B, the better the stability of the wind generating set, but the greater the power generation loss; the closer to the F point, the better the power generation performance of the wind generating set is, but the poor stability is.
Referring again to FIG. 1, in step S130, operation of the wind turbine generator set is controlled based on the determined speed-torque curve.
For example, a corresponding torque setpoint and/or rotational speed torque value is determined from the rotational speed/torque curve, and the operation of the wind power plant is controlled on the basis of the torque setpoint and/or rotational speed setpoint.
Optionally, the control method further includes: based on the determined speed-torque curve, a corresponding controller parameter is determined, which is preset. In the design stage of the wind generating set, the controller parameters are determined based on the working point of the normal working state, and the working point of the wind generating set when the winding faults are not considered (in the prior art, after the winding faults occur, the wind generating set needs to be cut off the power grid). Therefore, when the winding fails, in a default state, the controller performs control actions according to the design parameters, and at this time, there is a problem that the controller parameters are not matched with the current working point, which may cause the stability margin of the control system to be poor, thereby causing the fluctuation of the operation of the wind generating set. Preferably, the invention can provide multiple sets of controller parameters to avoid the problem of poor system stability margin caused by the fact that a single set of controller parameters cannot be matched with multiple operation states under multiple winding faults. Specifically, by simulating each working point of the wind generating set in operation according to different winding numbers under the control of the rotating speed-torque curves corresponding to different maximum outputtable power, the generating capacity and the operation stability are ensured as much as possible under the condition that the load of each working point meets the standard, so that a plurality of sets of controller parameters matched with each working point under different operation states are determined. Here, the controller may be a pitch controller and/or a torque controller.
Fig. 7 shows a wind power plant according to an embodiment of the invention.
Referring to fig. 7, a wind power generation set 700 according to an embodiment of the present invention may include a plurality of windings 710 and a control device 720. Here, the control device 720 may perform any of the control methods described with reference to fig. 1 to 6. For the sake of brevity, any control method described with reference to fig. 1 to 6, which is performed by the control device 720, will not be described repeatedly herein.
In the invention, when at least one winding of the wind generating set fails, the failed winding is cut out of the power grid, and power generation is continued based on the rest windings which can work normally, so that the invention ensures that: even if at least one winding fails, the wind generating set has certain generating capacity, so that the performance of the wind generating set is improved, and the availability of the wind generating set is greatly improved. In addition, when the winding faults are ensured, power generation is continued, and meanwhile, an optimal control curve can be timely selected according to various different conditions, so that the power generation performance of the wind generating set in the fault state is further improved.
According to the control method and the control device for the wind generating set with multiple windings, disclosed by the invention, the rotating speed-torque curve of the wind generating set can be rapidly determined based on the number of windings which are normally operated at present, and the operation of the wind generating set is controlled based on the determined rotating speed-torque curve, so that the operation of the wind generating set is rapidly and stably controlled, and the performance of the wind generating set is further improved.
According to an embodiment of the invention, the invention also provides an arrangement for controlling a wind power plant comprising a plurality of windings. The device comprises: one or more processors; and a memory storing a computer program which, when executed by the processor, implements any of the control methods described above.
Furthermore, it should be understood that various units in the device according to the exemplary embodiments of the present invention may be implemented as hardware components and/or as software components. The individual units may be implemented, for example, using a Field Programmable Gate Array (FPGA) or an Application Specific Integrated Circuit (ASIC), depending on the processing performed by the individual units as defined.
Furthermore, the method according to the exemplary embodiment of the present invention may be implemented as a computer program in a computer-readable recording medium. The computer program can be implemented by a person skilled in the art from the description of the method described above. The above-described method of the present invention is implemented when the computer program is executed in a computer.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.
Claims (18)
1. A control method of a wind power generation set including multiple windings, the control method comprising:
when at least one winding fails, determining the maximum outputtable power of the wind generating set based on the number of windings which are currently in normal operation;
determining a speed-torque curve corresponding to the maximum outputtable power;
controlling operation of the wind power generation set based on the determined speed-torque curve,
wherein the step of determining a speed-torque curve corresponding to the maximum outputtable power comprises:
determining a rotational speed-torque curve corresponding to the maximum outputtable power based on the maximum outputtable power and a design rotational speed-torque curve of the wind generating set, wherein the design rotational speed-torque curve comprises a first cut-in rotational speed section, a first variable rotational speed section and a first rated rotational speed section,
wherein determining a speed-torque curve corresponding to the maximum outputtable power based on the maximum outputtable power and a design speed-torque curve comprises:
determining a point corresponding to the maximum outputtable power as a first control point;
and determining a rotating speed-torque curve corresponding to the maximum output power based on the position of the torque corresponding to the first control point in a designed rotating speed-torque curve.
2. The control method according to claim 1, characterized in that the step of determining the rotation speed-torque curve corresponding to the maximum outputtable power based on the position of the torque corresponding to the first control point in the designed rotation speed-torque curve includes:
when the torque corresponding to the first control point is in the first rated rotation speed section, the rotation speed-torque curve corresponding to the maximum output power comprises the first cut-in rotation speed section, the first variable rotation speed section and a second rated rotation speed section, wherein the second rated rotation speed section comprises a connecting line from the end point of the first variable rotation speed section to the first control point.
3. The control method according to claim 1, characterized in that the step of determining the rotation speed-torque curve corresponding to the maximum outputtable power based on the position of the torque corresponding to the first control point in the designed rotation speed-torque curve includes:
when the torque corresponding to the first control point is in the first variable speed section, the speed-torque curve corresponding to the maximum output power comprises the first cut-in speed section and a second variable speed section, wherein the second variable speed section comprises a connecting line from the end point of the first cut-in speed section to the first control point.
4. The control method according to claim 1, characterized in that the step of determining the rotation speed-torque curve corresponding to the maximum outputtable power based on the position of the torque corresponding to the first control point in the designed rotation speed-torque curve includes:
when the torque corresponding to the first control point is in the first cut-in rotating speed section, a rotating speed-torque curve corresponding to the maximum output power comprises a third variable rotating speed section, wherein the third variable rotating speed section comprises a connecting line from the starting point of the first cut-in rotating speed section to the first control point.
5. The control method according to claim 1, characterized in that the step of determining the rotation speed-torque curve corresponding to the maximum outputtable power based on the position of the torque corresponding to the first control point in the designed rotation speed-torque curve includes:
when the torque corresponding to the first control point is in the first variable rotation speed section, determining a second control point on the first variable rotation speed section;
determining a speed-torque curve corresponding to the maximum outputtable power based on the second control point,
the rotation speed-torque curve corresponding to the maximum output power comprises the first cut-in rotation speed section, a fourth rotation speed section and a fifth rotation speed section, wherein the fourth rotation speed section comprises a connecting line from the end point of the first cut-in rotation speed section to the second control point, and the fifth rotation speed section comprises a connecting line from the second control point to the first control point.
6. A control method according to any one of claims 1-5, wherein the step of controlling the operation of the wind power plant based on the determined speed-torque curve comprises:
and determining a corresponding torque set value and/or a corresponding rotation speed set value according to the rotation speed-torque curve, and controlling the operation of the wind generating set based on the torque set value and/or the rotation speed set value.
7. The control method according to claim 1, characterized in that the control method further comprises: based on the determined speed-torque curve, a parameter of the respective controller is determined, which is preset.
8. Control method according to claim 7, wherein the controller is a pitch controller and/or a torque controller.
9. A wind power generation set, the wind power generation set comprising:
a plurality of windings;
a control device configured to: when at least one winding fails, determining the maximum outputtable power of the wind generating set based on the number of windings which are currently in normal operation; determining a speed-torque curve corresponding to the maximum outputtable power; and controlling the operation of the wind power generation set based on the determined speed-torque curve,
wherein the control device is configured to:
determining a rotational speed-torque curve corresponding to the maximum outputtable power based on the maximum outputtable power and a design rotational speed-torque curve of the wind generating set, wherein the design rotational speed-torque curve comprises a first cut-in rotational speed section, a first variable rotational speed section and a first rated rotational speed section,
wherein the control device is configured to:
determining a point corresponding to the maximum outputtable power as a first control point;
and determining a rotating speed-torque curve corresponding to the maximum output power based on the position of the torque corresponding to the first control point in a designed rotating speed-torque curve.
10. The wind power generation set of claim 9, wherein the control device is configured to:
when the torque corresponding to the first control point is in the first rated rotation speed section, the rotation speed-torque curve corresponding to the maximum output power comprises the first cut-in rotation speed section, the first variable rotation speed section and a second rated rotation speed section, wherein the second rated rotation speed section comprises a connecting line from the end point of the first variable rotation speed section to the first control point.
11. The wind power generation set of claim 9, wherein the control device is configured to:
when the torque corresponding to the first control point is in the first variable speed section, the speed-torque curve corresponding to the maximum output power comprises the first cut-in speed section and a second variable speed section, wherein the second variable speed section comprises a connecting line from the end point of the first cut-in speed section to the first control point.
12. The wind power generation set of claim 9, wherein the control device is configured to:
when the torque corresponding to the first control point is in the first cut-in rotating speed section, a rotating speed-torque curve corresponding to the maximum output power comprises a third variable rotating speed section, wherein the third variable rotating speed section comprises a connecting line from the starting point of the first cut-in rotating speed section to the first control point.
13. The wind power generation set of claim 9, wherein the control device is configured to:
when the torque corresponding to the first control point is in the first variable rotation speed section, determining a second control point on the first variable rotation speed section;
determining a speed-torque curve corresponding to the maximum outputtable power based on the second control point,
the rotation speed-torque curve corresponding to the maximum output power comprises the first cut-in rotation speed section, a fourth rotation speed section and a fifth rotation speed section, wherein the fourth rotation speed section comprises a connecting line from the end point of the first cut-in rotation speed section to the second control point, and the fifth rotation speed section comprises a connecting line from the second control point to the first control point.
14. Wind park according to any of claims 9-13, wherein the control means is configured to:
and determining a corresponding torque set value and/or a corresponding rotation speed set value according to the rotation speed-torque curve, and controlling the operation of the wind generating set based on the torque set value and/or the rotation speed set value.
15. The wind power generation set of claim 9, wherein the control device is configured to:
based on the determined speed-torque curve, a parameter of the respective controller is determined, which is preset.
16. Wind power unit according to claim 15, wherein the controller is a pitch controller and/or a torque controller.
17. A computer readable storage medium storing a computer program which, when executed by a processor, implements the control method of any one of claims 1 to 8.
18. An apparatus for controlling a wind power generation set including multiple windings, comprising:
one or more processors;
a memory storing a computer program which, when executed by a processor, implements the control method of any one of claims 1 to 8.
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| CN201910218022.8A CN111720265B (en) | 2019-03-21 | 2019-03-21 | Wind power generator set comprising multiple windings, control method thereof and control device thereof |
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| CN201910218022.8A CN111720265B (en) | 2019-03-21 | 2019-03-21 | Wind power generator set comprising multiple windings, control method thereof and control device thereof |
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