CN106246467B - The wind-driven power generation control system and its control method of wind power plant - Google Patents

Abstract

The present invention relates to a wind power generation control system and control method for a wind power plant. The wind power control system includes a centralized control platform and a wind power plant controlled by the centralized control platform. The wind power plant includes several The wind power generation device, the wind condition measurement device and the wind control device for controlling the speed of the wind power generation device are set together with each wind power generation device, the centralized control platform includes a control module group, a communication interface and a storage module group, the The control module group includes a fan unit module, a wind speed prediction module, an output prediction module, an output determination module, and a speed control module. The system and method can make the calculation of wind power accurate and stable, thereby better restraining the fluctuation of the power output from the wind farm and maintaining a constant output technology.

Description

Wind power generation control system and control method for wind farm

technical field

The invention belongs to the field of wind power generation control, in particular to a wind power generation control system and a control method for a wind power farm.

Background technique

By monitoring the meteorological data of the wind turbines at the most upwind position in the wind farm, the wind speed changes of the entire wind farm can be predicted, and the working status of each fan can be adjusted in time according to the above changes, thereby changing the power output of the entire wind farm. Therefore, how to determine which wind turbine is the most windy wind power generation device is very important. In the prior art, someone has installed a weather instrument near the wind turbines in the entire wind farm. When the wind changes, the weather instrument will transmit the change data. For the control system, the control system determines which wind turbine is the most windward device according to which wind turbine has new meteorological data of wind changes, and then calculates the delay of other wind turbines by the following formula 1.

_{T_delay} = L _cosθ /V

For example, the relevant calculation method is disclosed in the patent CN101994651B. In this patent document, the centralized control device is used to instruct each independent control device, so as to calculate the control level that maintains the output of the wind farm constantly during the predetermined period, and the control level is consistent with the control level. Control each wind power generation device. However, in practical applications, the wind speed and wind direction are constantly changing, and the strong changes within the predetermined time will cause errors in the calculation of the predetermined period, which will have a great impact on the next prediction; that is, whether the selection of the upper wind position device is appropriate , will affect the forecast, and the wind calculation will be inaccurate within the predetermined time, especially due to the limitation of terrain and landform. The error is larger when the wind direction is uncertain.

Contents of the invention

The present invention is proposed to solve the above-mentioned problems, and its purpose is to provide a wind power generation control system and control method of a wind farm, which can make the calculation of wind power accurate and stable, thereby better suppressing the loss of power output from the wind farm. technology to maintain a constant output.

In order to solve the above problems, the present invention provides a wind power generation control system of a wind farm, the wind power control system includes a centralized control platform and a wind farm controlled by the centralized control platform, the wind farm includes several The wind power generation device installed according to the terrain, the wind condition measurement device and the wind power control device for controlling the speed of the wind power generation device installed together with each wind power generation device, the centralized control platform includes a control module group, a communication interface and a storage module group , the control module group includes a fan unit module, a wind speed prediction module, an output prediction module, an output determination module, and a speed control module;

The wind condition measuring device measures wind force and wind direction data and transmits them to the control module group through the communication interface;

The control module group determines at least one group of upwind wind turbines and several downwind wind turbines according to the change value of wind force and wind direction; the wind wind turbines include a central power generation device and no less than one high power generation device respectively , low-level generators and/or horizontal generators;

The wind group module obtains the wind force and wind direction data of each power generation device of the wind group through the communication interface, and transmits the data to the wind speed prediction module; Predict the wind speed variation of each downwind fan at a fixed time interval with respect to the distance and angle of the downwind fan unit relative to the upwind fan unit; after the output prediction module determines that a certain group is an upwind generator set according to the control module group, it outputs The forecasting module receives an instruction to calculate the output change of the entire wind field, the output change of each wind power generating set, and the output change of a certain wind turbine after a predetermined time; the output decision module is used to determine the output of each wind power generating device the actual output power; the rotational speed control module is used to control the actual rotational speed of the wind power generation device according to the actual output power calculated by the determination module.

In a further preferred solution, the control module group also includes a wind speed comparison module and a central generator selection module, the wind speed comparison module is used to compare the actual wind speed and the average wind speed of each power generation device in the wind turbine group at the upper wind position, and send the wind speed to the center The generator selection module sends the comparison data, and selects the power generation device with the smallest difference in the comparison data as the central power generation device through its module.

Further, the control module group also includes a group correction module; when the wind speed changes, the difference before and after the wind speed change of the central power generation device is recorded according to a certain interval, and compared with the change threshold preset by the group correction module ; When the preset threshold is exceeded, a request is sent to the wind speed prediction module, and the data recorded in the high-level, low-level, and horizontal power generation devices are transferred for similarity comparison. According to whether the size of the similarity is within the specified value, the upwind wind turbines are combined.

Further, the storage module set also includes a history storage area, which is used to combine the corresponding positions of any combination of upwind wind turbines with their wind direction and store them in numbers.

Furthermore, the control module group also includes an initialization module. When the wind condition measuring device of the wind turbine at the upper wind level detects that the wind stops or the change of the wind direction exceeds a preset threshold, the wind turbine at the upper wind level is initialized and disbanded through the initialization module. group. According to the changing direction of the wind direction, the upwind wind group in this direction in the historical records of the storage module group is used as a reference as the initial upwind wind group.

Another improvement of the control system of the present invention is that: the storage module group also includes a surface feature storage area, which is used to record and perform error calculation according to the landmark features between the positions of the various wind turbines; the control module group also includes a wind speed prediction wind speed A correction module, the predicted wind speed correction module corrects the predicted wind speed according to the ground surface characteristics and height conditions where each wind turbine is located.

Another aspect of the present invention discloses a wind power generation control method, comprising the following steps:

The S01 wind speed measuring device monitors the wind speed of each power generating device in the upwind wind turbine unit;

S02 The wind speed comparison module receives the actual wind speed of each power generation device, and calculates the average wind speed, sends comparison data to the central generator selection module, and selects the power generation device with the smallest difference as the central power generation device; at the same time, the wind speed comparison module also monitors wind speed changes, Go to step S04 when the wind speed is constant, and go to step S03 if the wind speed changes;

S03 When the wind speed changes, the difference before and after the wind speed change of the central power generation device is recorded according to a certain interval, and compared with the preset change threshold, when the preset threshold is exceeded, the wind speed comparison module sends a request to the wind speed change prediction module , retrieve the data recorded in the high-level, low-level, and horizontal power generation devices for similarity comparison; among them, when the similarity between the central power generation device and the high-level power generation device and low-level power generation device exceeds 80%, and the similarity with the horizontal power generation device exceeds 90%, Then re-determine the fan unit in this group as the upwind fan unit;

S04 The wind speed prediction module predicts the wind speed change of each downwind fan at a fixed time interval according to the average wind force and wind direction of the upwind fan unit, and the distance and angle of the downwind fan relative to the central power generation device, and outputs the wind speed to the prediction module according to the wind speed change Issue orders for changes in wind power installations;

S05 The output prediction module receives the instruction, calculates and changes the output of the entire wind farm, each wind power generating set and a certain wind turbine after a predetermined time.

In the preferred solution, the method of the control module further includes: when there is no wind or the change of wind direction exceeds the threshold value preset by the wind direction prediction module, the initialization module initializes the upwind wind group and disbands the group; When the wind direction angle monitored by the wind condition measuring device 5 of the unit changes by more than the preset angle threshold of 30°, the output prediction module matches the wind direction with the historical records in the storage module group, and selects the upwind wind group with the corresponding number as Initial upwind wind turbine.

The beneficial effects of the present invention are:

1. Combining multiple power generation devices into an upwind wind turbine, and predicting the wind speed of the downwind wind turbine based on the average wind speed and position measured by it, the accuracy of the prediction result is high; especially when the wind speed changes greatly, compared with a single In the case that the prediction accuracy of the upwind wind turbine unit is poor, the prediction accuracy of the present invention is higher.

2. The combination of the upwind wind turbines of the present invention is combined in real time and optimally according to the actual situation, and adjusted and combined at any time according to the wind speed change of each power generating device, so as to further ensure the accuracy of the predicted value.

3. The system of the present invention has an initialization function. According to the situation of wind stop or wind direction change, the initialization module decides to initialize the upwind fan unit and disband the group. And the upwind wind turbine in the direction according to the historical records is used as a reference, as the initial upwind wind turbine. This saves the combined work of the wind turbines at the windward position and improves the work efficiency of wind turbine prediction.

4. The topographical features will affect the wind speed according to the different wind conditions at different heights. The control system of the present invention overcomes the error caused by the topographical features to the predicted wind speed by setting the predicted wind speed correction module, and further improves the accuracy of the predicted value. sex.

Description of drawings

Fig. 1 is the structure diagram of the first embodiment of the wind power generation control system of the present invention;

Fig. 2 is a schematic structural diagram of a second embodiment of the wind power generation control system of the present invention;

Fig. 3 is a characteristic comparison diagram of the actual wind speed variation curve of the central power generation device and the actual wind speed variation curve of the horizontal power generation device.

Detailed ways

Fig. 1 shows an embodiment of the wind power generation control system of the wind farm of the present invention, the wind power generation control system 1 includes a centralized control platform 2 and a wind farm 3 controlled by the centralized control platform 2, the The wind farm 3 includes several wind power generators 4 arranged according to terrain, a wind condition measuring device 5 arranged with each wind power generator 4 and a wind control device 6 for controlling the speed of the wind power generators, and the centralized control platform 2 It includes a control module group 8 , a communication interface 7 and a storage module group 9 . The control module group 8 includes a fan unit module 10 , a wind speed prediction module 11 , an output prediction module 13 , an output determination module 14 , and a speed control module 15 .

The wind condition measurement device 5 transmits the data of wind force and wind direction to the control module group 8 through the communication interface 7 .

The control module group 8 determines at least one set of upwind wind turbines 16 and several downwind wind turbines 17 according to the change value of the wind force and wind direction; high-level generators, low-level generators, and/or horizontal generators.

The wind group module 10 obtains the wind force and wind direction data of each power generation device of the wind group through the communication interface, and transmits the data to the wind speed prediction module 11 .

The wind speed prediction module 11 is used to predict the wind speed of each downwind fan according to the average wind force and wind direction of the upwind fan unit 16 and the distance and angle of the downwind fan 17 relative to the upwind fan unit 16 17 Wind speed changes at fixed time intervals.

After the output prediction module 13 determines that a certain group is the upper wind generating set according to the foregoing, the output predicting module 13 receives an instruction to calculate the output change of the entire wind field, the output change of each wind generating set, and the output of a certain wind turbine after a predetermined time. output changes.

The output determination module 14 is used to determine the actual output power of each of the wind power generation devices 4 .

The rotational speed control module 15 is used for controlling the actual rotational speed of the wind power generation device 4 according to the actual output power calculated by the determination module 14 .

In addition, the storage area of the storage module group 9 includes a device position data storage area and an output characteristic storage area, which can be used to mark and store the positions of each fan, so as to provide a reference point to the predicted fan position for the control module group 8 when making predictions. Relevant position parameters are combined with the wind speed data measured by the wind condition measuring device 5 to calculate the delay of the downwind fan by formula 1. The specific calculation process is disclosed in the patent cited in the background technology, and will not be described in detail here.

Still another embodiment of the wind power generation control system of the present invention: the control module group 8 further includes a wind speed comparison module 12 and a central generator selection module 19 , as shown in FIG. 2 . The wind speed comparison module 12 is used to compare the actual wind speed and the average wind speed of each power generating device in the upper wind turbine unit 16, and sends comparison data to the central generator selection module 19, and the difference is the smallest in the selected comparison data by its module The power generation device is the central power generation device.

The control module group 8 also includes a group correction module 18; when the wind speed changes, the difference before and after the change of the wind speed of the central power generation device is recorded according to a certain interval, and compared with the change threshold preset by the group correction module 18 , when the preset threshold value is exceeded, a request is sent to the wind speed prediction module 11, and the data recorded in the high-level, low-level and horizontal power generation devices are called for similarity comparison. When the similarity between the wind speed change curve of the central power generation device and the wind speed change curves of the high-level power generation device and the low-level power generation device exceeds 80%, and the similarity of more than 90% with the wind speed change curve of the horizontal power generation device, the group of wind turbines is re-determined as the upwind position Wind turbine 16; wherein, the wind speed change curve is specifically the characteristic curve of the relationship between the wind speed change frequency and the wind speed magnitude of the power generation device within the evaluation time, and the similarity is specifically the shape similarity of the wind speed change curves of different power generation devices. For example, as shown in Figure 3, within the evaluation time, the characteristic comparison chart of the actual wind speed variation curve a of the central power generation device and the actual wind speed variation curve b of the horizontal power generation device.

The storage module group 9 of the control system of the present invention also includes a history storage area, which is used to combine the corresponding positions of any combination of upwind wind turbines 16 with the wind direction and store them in numbers. The control module group 8 also includes an initialization module 20. When the wind condition measuring device 5 of the wind turbine unit 16 at the upper wind position detects that the wind stops or the wind direction changes beyond a preset threshold, the wind turbine unit 16 at the upper wind position is initialized through the initialization module 20. , to disband the group.

When the change of the wind direction angle exceeds the preset angle threshold of 30°, the output prediction module 13 matches the historical records in the storage module group 9 according to the wind direction, and selects the upwind wind group 16 of the corresponding number as the initial upwind wind group 16.

In addition, changes in topographical characteristics according to different heights of wind conditions will affect the wind speed. For example, the friction between the wind and the ground will be different, and the influence of the ground will be different according to different heights. In order to overcome the error caused by terrain features to the predicted wind speed, the storage module group 9 of the control system of the present invention also includes a surface feature storage area, which is used to record and perform error calculation according to the landmark features between the positions of the various wind turbines; The control module group 8 also includes a wind speed prediction wind speed correction module 21, and the predicted wind speed correction module 21 corrects the predicted wind speed according to the ground surface characteristics and altitude conditions where each wind turbine is located. When the wind speed prediction module 11 calculates the predicted wind speed, it extracts the corresponding landmark feature number from the landmark feature storage area, and performs error calculation according to the parameter of the corresponding number. The error formula based on which the error is calculated is:

In the formula, h and l are the height measured from the ground, V _h and V _l are the wind speed at the corresponding height, and Z ₀ is the ground roughness coefficient.

The error between the predicted wind speed calculated by the above formula and the actual wind speed is small, which further improves the stability of the constant output of the fan.

The wind farm of the present invention also provides a wind power generation control method according to the above control system, comprising the following steps:

S01 wind speed measuring device 5 monitors the wind speed of each power generating device in the upwind wind turbine unit 16;

S02 wind speed comparison module 12 receives the actual wind speed of each power generating device, and calculates the average wind speed, sends comparative data to the central generator selection module 19, and selects the power generating device with the smallest difference as the central power generating device; while wind speed comparing module 12 also monitors When the wind speed changes, go to step S04 when the wind speed is constant, and go to step S03 if the wind speed changes;

S03 When the wind speed changes, the difference before and after the wind speed change of the central power generation device is recorded according to a certain interval, and compared with the preset threshold value. Send a request to retrieve the data recorded in the high-level, low-level, and horizontal power generation devices for similarity comparison; among them, when the similarity between the central power generation device and the high-level power generation device and low-level power generation device exceeds 80%, and the similarity with the horizontal power generation device exceeds 90%. %, then re-determine that the fan unit in this group is the upwind fan unit 16;

S04 wind speed prediction module 11 predicts the wind speed variation of each downwind fan 17 at a fixed time interval according to the average wind force and wind direction of the upwind fan unit 16, and the distance and angle of the downwind fan 17 relative to the central power generation device, and according to the wind speed variation Issue the change command of the wind power generation device to the output prediction module 13;

S05 The output prediction module 13 receives the instruction and calculates to change the output of the entire wind farm, each wind power generating set and a certain wind turbine after a predetermined time.

Wherein, the control module method further includes: when there is no wind or the wind direction change exceeds the preset threshold value of the wind direction prediction module 21, the initialization module 20 initializes the upwind wind turbine unit 16, and disbands the group; wherein, when the wind condition When the change of the wind direction angle monitored by the measuring device 5 exceeds the preset angle threshold of 30°, the output prediction module 13 matches the wind direction with the historical records in the storage module group 9, and selects the upwind wind group 16 of the corresponding number as the initial Upwind wind turbine unit 16.

The above-mentioned embodiments are only descriptions of preferred implementations of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, those skilled in the art may make various modifications to the technical solutions of the present invention. and improvements, all should fall within the scope of protection determined by the claims of the present invention.

Claims (10)

1. a kind of wind-driven power generation control system of wind power plant, which is characterized in that the wind-driven power generation control system (1) includes Centralized Control platform (2) and the wind power plant (3) controlled by the centralized Control platform (2), wind power plant (3) packet Include several wind power generation plants (4) set according to topography, the Wind regime measurement device being set along with each wind power generation plant (4) (5) and the wind control device (6) of the control wind power generation plant rotating speed, the centralized Control platform (2) include control mould Block group (8), communication interface (7) and memory module group (9), the control module group (8) are pre- including blower fan group module (10), wind speed Survey module (11), output prediction module (13), output decision module (14) and rotational speed control module (15)；

After Wind regime measurement device (5) the measure wind-force and wind direction data the control is passed to by the communication interface (7) Module group (8)；

The control module group (8) determines at least one set of windward position blower fan group (16) and several according to the changing value of wind-force and wind direction Lee gauge machine (17)；Windward position blower fan group (16) includes center power generator and is no less than one respectively High-order power generator, low level power generator and/or horizontal power generator；

The blower fan group module (10) obtains the wind-force and wind direction data of each power generator of blower fan group by communication interface, and passes Transport to forecasting wind speed module (11)；

The forecasting wind speed module (11) is for the average wind according to windward position blower fan group (16) and wind direction and described Lee gauge wind turbine (17) is predicted described relative to the distance and angle of the center power generator of windward position blower fan group (16) Each lee gauge wind turbine (17) changes in the wind speed of Fixed Time Interval；

The output prediction module (13) determines certain group for after windward generating set, mould is predicted in output according to control module group (8) Block (13) is connected to instruction, calculates after a predetermined time, and entire wind field output changes and the output of each wind power generating set becomes Dynamic and some wind turbine output changes；

It is described to export decision module (14) for determining the real output of each wind power generation plant (4)；

The rotational speed control module (15) is for the real output that is calculated according to gone out decision module (14), described in control The actual speed of wind power generation plant (4).

2. wind-driven power generation control system as described in claim 1, which is characterized in that the control module group (8) has further included Wind speed comparison module (12) and center generator selecting module (19), the wind speed comparison module (12) is for comparing windward position wind The actual wind speed and mean wind speed of each power generator in unit (16), and compare to center generator selecting module (19) transmission Data, and select through its module and to compare in data power generator centered on the power generator of difference minimum.

3. wind-driven power generation control system as claimed in claim 2, which is characterized in that the control module group (8) further includes group Other correcting module (18)；When wind speed changes, the front and rear difference of center power generator wind speed variation is recorded according to certain intervals Get off, and compared with group correcting module (18) preset movement threshold, when more than predetermined threshold value, to wind speed prediction module (11) request is sent out, already recorded data in a high position, low level, horizontal power generator is transferred and carries out similarity-rough set.

4. wind-driven power generation control system as claimed in claim 3, which is characterized in that when the wind speed of center power generator changes song The wind speed change curve similarity of line and high-order power generator and low level power generator is more than 80%, the wind with horizontal power generator Fast change curve similarity is more than 90%, then redefines this group of blower fan group as windward position blower fan group (16)；Wherein, wind speed changes Curve is specially in evaluation time, the wind speed variation frequency of power generator and the characteristic of wind speed size, similarity The form similarity of the wind speed change curve of specially different power generator.

5. the wind-driven power generation control system as described in any one of claim 1-4, which is characterized in that the memory module group (9) history storage area has been further included, for by the corresponding position of the windward position blower fan group (16) of any combination and its wind-engaging wind To combination, and number and stored.

6. wind-driven power generation control system as claimed in claim 5, which is characterized in that the control module group (8) has further included Initialization module (20) is becalmed or wind vector is more than pre- when the Wind regime measurement device (5) of windward position blower fan group (16) detects If during threshold value, windward position blower fan group (16) is initialized by initialization module (20), dismiss group.

7. wind-driven power generation control system as claimed in claim 6, which is characterized in that when wind direction angle change is more than preset angle When spending 30 ° of threshold value, the output prediction module (13) is matched according to wind direction with the historical record in memory module group (9), The windward position blower fan group (16) of reference numeral is selected, as initial windward position blower fan group (16).

8. wind-driven power generation control system as claimed in claim 2, which is characterized in that the memory module group (9) has further included Topographical features storage region, for being recorded according to the terrestrial reference feature between each wind turbine position and carrying out error calculation；The control Molding block group (8) further includes forecasting wind speed wind speed correcting module (21), and the prediction of wind speed correcting module (21) is according to each wind Topographical features and height condition where machine are modified prediction of wind speed.

9. a kind of control method of wind-driven power generation control system as described in any one of claim 1-8, includes the following steps：

The wind speed of each power generator in S01 anemometries device (5) monitoring windward position blower fan group (16)；

S02 wind speed comparison module (12) receives the actual wind speed of each power generator, and calculates mean wind speed, is sent out to center Data are compared in selection of Motor module (19) transmission, select power generator centered on the power generator of difference minimum；Wind speed ratio simultaneously Wind speed variation is also monitored compared with module (12), when wind speed is constant up to step S04, wind speed changes then to step S03；

When wind speed changes, the front and rear difference of center power generator wind speed variation is recorded S03 according to certain intervals, and Compared with preset movement threshold, when more than predetermined threshold value, wind speed comparison module (12) changes prediction module to wind speed (18) request is sent out, already recorded data in a high position, low level, horizontal power generator is transferred and carries out similarity-rough set；Wherein, in the middle Heart power generator is more than 80% with high-order power generator and low level power generator similarity, is more than with horizontal power generator similarity 90%, then this group of blower fan group is redefined as windward position blower fan group (16)；

S04 forecasting wind speeds module (11) is according to the average wind and wind direction and lee gauge wind turbine of windward position blower fan group (16) (17) wind speed of each lee gauge wind turbine (17) in Fixed Time Interval is predicted relative to the distance and angle of center power generator It changes, and the variation instruction of wind power generation plant is assigned according to wind speed change trend output prediction module (13)；

S05 output prediction modules (13) are connected to instruction, calculate after a predetermined time, to entire wind field, each wind-driven generator The output of group and some wind turbine is changed.

10. control method as claimed in claim 9, which is characterized in that the control method further includes：Become in calm or wind direction Windward position blower fan group (16) is carried out just by initialization module (20) when changing more than wind direction prediction module (21) preset threshold value Beginningization dismisses group；Wherein, when the wind direction angle change of the Wind regime measurement device 5 of windward position blower fan group (16) monitoring is more than pre- If 30 ° of angle threshold when, historical record of the output prediction module (13) in wind direction and memory module group (9) carries out Matching selects the windward position blower fan group (16) of reference numeral, as initial windward position blower fan group (16).