Active power control method, device and system for wind turbine generator
By introducing pitch angle as an adjustment reference into wind turbine units and rationally allocating active power adjustment, the problem of inaccurate active power adjustment in wind farms is solved, and precise matching between wind farms and the power grid system is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- BEIJING GOLDWIND SCI & CREATION WINDPOWER EQUIP CO LTD
- Filing Date
- 2021-12-14
- Publication Date
- 2026-07-14
AI Technical Summary
In existing technologies, wind farms have difficulty accurately adjusting active power to meet the AGC active power dispatch instructions of the power grid system, mainly due to inaccurate wind speed measurement and uncertainties in the conversion process, which lead to inaccurate theoretical active power.
By introducing the pitch angle of the wind turbine as an adjustment reference, the active power adjustment amount is allocated according to the difference between the pitch angle and the pitch range. The active power adjustment amount of the wind turbine is reasonably allocated so as to make the active power output of the wind farm close to the planned active power of the entire field indicated by the power grid system.
It improves the accuracy and speed of active power adjustment of the entire wind farm, ensuring that the active power output of the wind farm is within the error range required by the power grid system, thus enhancing the control effect of the wind farm.
Smart Images
Figure CN116264405B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of wind power generation technology, specifically to a method, device, and system for controlling the active power of a wind turbine. Background Technology
[0002] In practical applications, wind farms receive active power dispatch commands from the power grid system via Automatic Generation Control (AGC) and adjust the active power of the wind turbines accordingly. This ensures that the active power output of the entire wind farm is close to the active power indicated by the AGC command, meaning the deviation between the wind farm's output and the AGC command's indication is within the error range required by the power grid system. Furthermore, with the increasing stringency of power grid system requirements in recent years, the demands on the control accuracy and speed of the active power output from wind farms have become increasingly stringent.
[0003] In existing technologies, after receiving the AGC active power dispatch command, the wind farm usually adjusts the active power output of the wind turbines based on the theoretical active power reported in real time and the current actual active power.
[0004] However, the results achieved by the above adjustment methods are usually not ideal. Adjusting the active power output of wind turbines using this method often fails to bring the overall active power output of the wind farm close to the active power indicated by the AGC active power dispatch command. The reason for this is that the calculation of theoretical active power is based on measured wind speed, which often fluctuates rapidly and is affected by environmental uncertainties. Therefore, it is usually difficult to guarantee the accuracy of the measured wind speed. Consequently, calculating theoretical active power based on inaccurate wind speed measurements will also lead to inaccurate theoretical active power. In addition, there is also a certain degree of uncertainty in the conversion process from wind speed to theoretical active power, which further affects the accuracy of the calculated theoretical active power. Summary of the Invention
[0005] This application provides a method, device, and system for controlling the active power of a wind turbine, which can effectively adjust the active power output of the wind turbine so that the active power output of the entire wind farm is close to the planned active power of the entire farm indicated by the power grid system.
[0006] In view of the above, the first aspect of this application provides a method for controlling the active power of a wind turbine generator, the method comprising:
[0007] Obtain the planned active power for the entire field sent by the power grid system;
[0008] Based on the current on-grid active power of the wind farm and the planned active power of the entire farm, determine the adjustment amount of the active power of the entire farm; and based on the adjustment amount of the active power of the entire farm, determine the power adjustment strategy for the wind farm.
[0009] When the determined power adjustment strategy is a power increase strategy, for each target wind turbine in the wind farm, the adjustment power corresponding to the target wind turbine is determined based on the target wind turbine's current pitch angle, minimum pitch range, rated power, and the total active power adjustment amount of the entire wind farm; when the determined power adjustment strategy is a power decrease strategy, for each target wind turbine in the wind farm, the adjustment power corresponding to the target wind turbine is determined based on the target wind turbine's current pitch angle, maximum pitch range, rated power, and the total active power adjustment amount of the entire wind farm.
[0010] Based on the adjustment power corresponding to each of the target wind turbines in the wind farm, the active power output of each target wind turbine in the wind farm is controlled.
[0011] Optionally, when the determined power adjustment strategy is a power-up strategy, before determining the adjustment power corresponding to the target wind turbine for each target wind turbine in the wind farm based on the current pitch angle, minimum pitch range, rated power, and the total active power adjustment of the wind farm, the method further includes:
[0012] The total theoretical active power is determined based on the theoretical active power of each wind turbine currently generating power in the wind farm.
[0013] When the planned active power of the entire field is greater than the total theoretical active power, the candidate wind turbines in the wind farm that are not in the power generation state are controlled to start and enter the power generation state.
[0014] Each wind turbine in the wind farm that is generating electricity is taken as the target wind turbine.
[0015] Optionally, determining the adjustment power corresponding to each target wind turbine in the wind farm, based on the target wind turbine's current pitch angle, minimum pitch range, rated power, and the overall active power adjustment, includes:
[0016] For each target wind turbine in the wind farm, the first reference power corresponding to the target wind turbine is determined based on the difference between the current pitch angle and the minimum pitch range of the target wind turbine, and the rated power of the target wind turbine.
[0017] The total first reference power is determined based on the first reference power corresponding to each of the target wind turbines in the wind farm.
[0018] For each target wind turbine in the wind farm, the adjustment power corresponding to the target wind turbine is determined based on the first reference power corresponding to the target wind turbine, the total first reference power, and the adjustment amount of the active power of the entire farm.
[0019] Optionally, when the determined power adjustment strategy is a power reduction strategy, after determining the adjustment power corresponding to each target wind turbine in the wind farm based on the current pitch angle, maximum pitch range, rated power, and the total active power adjustment of the wind farm, the method further includes:
[0020] For each target wind turbine in the wind farm, the predicted active power of the target wind turbine is determined based on the active power set value of the target wind turbine in the previous working cycle and the corresponding adjustment power of the target wind turbine.
[0021] The total predicted active power is determined based on the predicted active power of each target wind turbine in the wind farm.
[0022] If the predicted active power of each target wind turbine in the wind farm reaches its corresponding lower limit of output active power, and the total predicted active power is greater than the planned active power of the entire farm, then at least one target wind turbine in the wind farm will be shut down.
[0023] Optionally, determining the adjustment power corresponding to each target wind turbine in the wind farm, based on the target wind turbine's current pitch angle, maximum pitch range, rated power, and the overall active power adjustment, includes:
[0024] For each target wind turbine in the wind farm, the second reference power corresponding to the target wind turbine is determined based on the difference between the maximum pitch range of the target wind turbine and the current pitch angle, as well as the rated power of the target wind turbine.
[0025] The total second reference power is determined based on the second reference power corresponding to each of the target wind turbines in the wind farm.
[0026] For each target wind turbine in the wind farm, the adjustment power corresponding to the target wind turbine is determined based on the second reference power corresponding to the target wind turbine, the total second reference power, and the adjustment amount of the active power of the entire farm.
[0027] Optionally, the method further includes:
[0028] Determine whether the adjusted power corresponding to the target wind turbine is greater than the maximum power adjustment threshold corresponding to the target wind turbine, and whether it is less than the minimum power adjustment threshold corresponding to the target wind turbine;
[0029] If the adjusted power corresponding to the target wind turbine is greater than the maximum power adjustment threshold corresponding to the target wind turbine, then the adjusted power limit corresponding to the target wind turbine is set to the maximum power adjustment threshold corresponding to the target wind turbine.
[0030] If the adjusted power corresponding to the target wind turbine is less than the minimum power adjustment threshold corresponding to the target wind turbine, then the adjusted power limit corresponding to the target wind turbine is set to the minimum power adjustment threshold corresponding to the target wind turbine.
[0031] Optionally, controlling the output active power of each target wind turbine in the wind farm according to the corresponding adjustment power of each target wind turbine in the wind farm includes:
[0032] For each target wind turbine in the wind farm, the active power setting value of the target wind turbine in the current working cycle is determined based on the active power setting value of the target wind turbine in the previous working cycle and the corresponding adjustment power of the target wind turbine.
[0033] For each target wind turbine in the wind farm, the active power output of the target wind turbine is controlled based on the active power set value of the target wind turbine in the current working cycle.
[0034] Optionally, the method further includes:
[0035] For each target wind turbine in the wind farm, determine whether the active power set value of the target wind turbine in the current working cycle is greater than the theoretical active power of the target wind turbine, and whether it is less than the minimum output active power of the target wind turbine.
[0036] If the active power set value of the target wind turbine in the current working cycle is greater than the theoretical active power of the target wind turbine, then the active power set value is limited to the theoretical active power of the target wind turbine.
[0037] If the active power setting value of the target wind turbine in the current working cycle is less than the minimum output active power of the target wind turbine, then the active power setting value is limited to the minimum output active power of the target wind turbine.
[0038] A second aspect of this application provides an active power control device for a wind turbine generator, the device comprising:
[0039] The acquisition unit is used to acquire the total planned active power transmitted by the power grid system.
[0040] The strategy determination unit is used to determine the total active power adjustment amount based on the current grid-connected active power of the wind farm and the total planned active power of the wind farm; and to determine the power adjustment strategy for the wind farm based on the total active power adjustment amount.
[0041] The adjustment amount determination unit is used to determine the adjustment power corresponding to each target wind turbine in the wind farm when the determined power adjustment strategy is a power increase strategy, based on the current pitch angle, minimum pitch range, rated power, and the total active power adjustment amount of the target wind turbine; and to determine the adjustment power corresponding to each target wind turbine in the wind farm when the determined power adjustment strategy is a power decrease strategy.
[0042] The control unit is used to control the output active power of each target wind turbine in the wind farm according to the adjustment power corresponding to each target wind turbine in the wind farm.
[0043] A third aspect of this application provides an active power control system for a wind turbine generator, the system comprising: a power grid system, an active power controller, and a wind turbine generator;
[0044] The power grid system is used to send active power adjustment commands to the active power controller; the active power adjustment commands include the planned active power for the entire field.
[0045] The active power controller is used to execute the active power control method for the wind turbine generator described in the first aspect.
[0046] The wind turbine is used to respond to the control of the active power controller and output active power.
[0047] As can be seen from the above technical solutions, the embodiments of this application have the following advantages:
[0048] This application provides an active power control method for wind turbine generators. This method no longer uses the theoretical active power of the wind turbine generator as a reference to adjust the active power output of the wind turbine generator in the wind farm. Instead, it innovatively introduces the pitch angle of the wind turbine generator as a reference for adjusting the active power output. When it is necessary to control the increase of the active power output of the wind farm, the active power adjustment amount allocated to the target wind turbine generator is determined based on the difference between the current pitch angle of the target wind turbine generator and its minimum pitch range. When it is necessary to control the decrease of the active power output of the wind farm, the active power adjustment amount allocated to the target wind turbine generator is determined based on the difference between the current pitch angle of the target wind turbine generator and its maximum pitch range. For wind turbines with a large pitch angle margin, more active power adjustment can be allocated, while for wind turbines with a small pitch angle margin, less active power adjustment can be allocated. This allows for a reasonable allocation of active power adjustment, which is beneficial for improving the overall adjustment effect of the wind farm and making the active power output of the wind farm close to the planned active power of the entire farm indicated by the power grid system. Attached Figure Description
[0049] Figure 1 A schematic diagram illustrating the working principle of the active power control system for a wind turbine provided in this application embodiment;
[0050] Figure 2 A flowchart illustrating an active power control method for a wind turbine generator provided in this application embodiment;
[0051] Figure 3 A flowchart illustrating another active power control method for a wind turbine provided in this application embodiment;
[0052] Figure 4 This is a schematic diagram of the active power control device for a wind turbine provided in an embodiment of this application. Detailed Implementation
[0053] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.
[0054] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.
[0055] In order to improve the adjustment effect of the active power output of the entire wind farm and make the active power output of the entire wind farm close to the planned active power of the entire farm indicated by the power grid system, this application provides an active power control method for wind turbine units.
[0056] Specifically, in this method, after obtaining the planned active power of the entire wind farm sent by the power grid system, the total active power adjustment amount can be determined based on the current grid-connected active power of the wind farm and the planned total active power. Then, based on this total active power adjustment amount, a power adjustment strategy for the wind farm is determined. When the determined power adjustment strategy is a power-increasing strategy, for each target wind turbine in the wind farm, the corresponding adjustment power is determined based on the target wind turbine's current pitch angle, minimum pitch range, rated power, and the aforementioned total active power adjustment amount. When the determined power adjustment strategy is a power-reducing strategy, for each target wind turbine in the wind farm, the corresponding adjustment power is determined based on the target wind turbine's current pitch angle, maximum pitch range, rated power, and the aforementioned total active power adjustment amount. Furthermore, based on the adjustment power corresponding to each target wind turbine in the wind farm, the output active power of each target wind turbine in the wind farm is controlled.
[0057] The aforementioned active power adjustment method no longer uses the theoretical active power of wind turbines as a reference to adjust the active power output of wind turbines in a wind farm. Instead, it innovatively introduces the pitch angle of the wind turbines as a reference for adjusting the active power output. When it is necessary to control the increase of active power output from the wind farm, the active power adjustment amount allocated to the target wind turbine is determined based on the difference between the current pitch angle of the target wind turbine and its minimum pitch range. When it is necessary to control the decrease of active power output from the wind farm, the active power adjustment amount allocated to the target wind turbine is determined based on the difference between the current pitch angle of the target wind turbine and its maximum pitch range. For wind turbines with a large pitch angle margin, more active power adjustment can be allocated, while for wind turbines with a small pitch angle margin, less active power adjustment can be allocated. This allows for a reasonable allocation of active power adjustment, which is beneficial for improving the overall adjustment effect of the wind farm and making the active power output of the wind farm close to the planned active power of the entire farm indicated by the power grid system.
[0058] The active power control method for wind turbines provided in this application can be specifically applied to the active power control system for wind turbines provided in this application. The active power control system for wind turbines provided in this application will be introduced below.
[0059] See Figure 1 , Figure 1 This is a schematic diagram illustrating the working principle of the active power control system for a wind turbine generator provided in an embodiment of this application. Figure 1 As shown, the active power control system of the wind turbine includes a power grid system 101, an active power controller 102, and a wind turbine 103.
[0060] Among them, the power grid system 101 mainly refers to the power dispatching unit of the power grid, which is used to send active power adjustment instructions to the active power controller 102. The active power adjustment instructions include the planned active power of the entire field. The planned active power of the entire field is the active power output target of the entire wind power plant, that is, it is necessary to control the active power output of the entire wind power plant to be close to the planned active power of the entire field.
[0061] The active power controller 102 is used to execute the active power control method for wind turbines provided in this application embodiment, so as to control the active power output of each wind turbine 103 to be close to the planned active power of the entire wind farm issued by the power grid system 101. Specifically, the active power controller 102 is a control system located inside the wind farm, which can cooperate with each wind turbine in the wind farm to adjust the active power output of each wind turbine.
[0062] like Figure 1As shown, the active power controller 102 may exemplarily include an instruction receiving module 1021, a power allocation module 1022, and a communication module 1023. The instruction receiving module 1021 receives active power adjustment instructions sent by the power grid system 101 and extracts the planned active power for the entire wind farm. The power allocation module 1022 specifically executes the active power control method for wind turbines provided in this embodiment to allocate adjustment power to each wind turbine according to its current state in the wind farm, and determines the active power that each wind turbine should output. The communication module 102 sends the active power that the power allocation module 1022 determines for each wind turbine to output to each wind turbine 103, so that each wind turbine 103 adjusts its own output active power accordingly.
[0063] The system includes multiple wind turbine generators 103, meaning that the active power control system can include multiple wind turbine generators 103. Each wind turbine generator 103 responds to the control of the active power controller 102 and outputs corresponding active power. In other words, the wind turbine generator 103 can adjust its operating state according to the active power sent to it by the active power controller 102 (i.e., the active power that the active power controller 102 determines the wind turbine generator 103 should output), thereby enabling it to output that active power.
[0064] The active power control method for wind turbines provided in this application will be described below through method embodiments. See also Figure 2 , Figure 2 This is a flowchart illustrating the active power control method for wind turbine generators provided in an embodiment of this application, as shown below. Figure 2 As shown, the method includes:
[0065] Step 201: Obtain the planned active power of the entire field sent by the power grid system.
[0066] In practical applications, the active power controller can periodically adjust the active power output of the entire wind farm. Each time the active power controller adjusts the active power output of the entire wind farm, it can obtain the most recent planned active power G issued by the power grid system for the entire farm. The adjustment period of the active power controller can be any length between 1 second and 60 seconds.
[0067] Step 202: Determine the total active power adjustment amount based on the current grid-connected active power of the wind farm and the planned total active power of the entire farm; and determine the power adjustment strategy for the wind farm based on the total active power adjustment amount.
[0068] After the active power controller obtains the planned active power G for the entire wind farm, it can calculate the difference between the planned active power G and the current grid-connected active power P of the wind farm, thus obtaining the active power deviation P for the entire wind farm. err It should be understood that the current grid-connected active power P of the wind farm here refers to the actual active power output of the entire wind farm at present. Furthermore, the deviation P of the total active power output can be measured using a PID (Proportion Integral Differential) controller (the control parameters of which can be read from a configuration file). err The correction is performed to obtain the total active power adjustment ΔP.
[0069] When determining the power adjustment strategy for a wind farm, the relationship between the total active power adjustment ΔP and a preset dead zone threshold can be used to determine whether to adopt a power increase or power decrease strategy. Specifically, if the total active power adjustment ΔP is within the preset dead zone (i.e., if ΔP is greater than the lower dead zone threshold but less than the upper dead zone threshold), then no adjustment to the total active power output of the wind farm is required. If ΔP is less than the lower dead zone threshold, then a power decrease strategy is needed, meaning the total active power output of the wind farm needs to be reduced. If ΔP is greater than the upper dead zone threshold, then a power increase strategy is needed, meaning the total active power output of the wind farm needs to be increased.
[0070] It should be noted that the active power controller can also read the status data of each wind turbine in the wind farm, and based on this data, filter out the controllable wind turbines in the wind farm. For example, the active power controller can filter out wind turbines that are generating electricity normally, meaning those without any abnormal conditions such as shutdown, malfunction, or being out of control. For each controllable wind turbine in the wind farm, the active power controller can further read the rated power P of these turbines. rated Current pitch angle β i Minimum pitch range β min Maximum pitch range β max In addition, the power setpoint of the previous working cycle, the theoretical power of the fan, and the fan status.
[0071] Step 203: When the determined power adjustment strategy is a power increase strategy, for each target wind turbine in the wind farm, the adjustment power corresponding to the target wind turbine is determined based on the current pitch angle, minimum pitch range, rated power, and the total active power adjustment amount of the target wind turbine; when the determined power adjustment strategy is a power decrease strategy, for each target wind turbine in the wind farm, the adjustment power corresponding to the target wind turbine is determined based on the current pitch angle, maximum pitch range, rated power, and the total active power adjustment amount of the target wind turbine.
[0072] When the determined power adjustment strategy is a power-up strategy, the active power controller can determine the corresponding adjustment power for each target wind turbine in the wind farm based on the target wind turbine's current pitch angle, minimum pitch range, rated power, and the total active power adjustment of the entire wind farm. It should be understood that the target wind turbine here refers to the wind turbine in the wind farm that is currently generating electricity.
[0073] To ensure that the active power output of the wind farm is close to the planned active power of the entire wind farm after adjusting the active power output of each target wind turbine using a power-up strategy, the active power controller can first determine the total theoretical active power based on the theoretical active power of each wind turbine currently generating power in the wind farm before determining the adjustment power corresponding to each target wind turbine. When the planned active power of the entire wind farm is greater than the total theoretical active power, the controller controls the candidate wind turbines that are not generating power in the wind farm to start and enter the generating state. The wind turbines that are generating power in the wind farm are then used as the target wind turbines.
[0074] Specifically, the active power controller can calculate the sum of the theoretical active power of each wind turbine currently generating power in the wind farm, which is then used as the total theoretical active power ∑P. real i If the planned active power G of the entire field is greater than the total theoretical active power ∑P real i This indicates that simply adjusting the active power output of each wind turbine currently generating power in the wind farm is insufficient to make the total active power output of the wind farm reach the planned active power G. In this case, it is necessary to increase the number of wind turbines that can generate power in the wind farm, that is, to control the candidate wind turbines that are not currently generating power in the wind farm to start up and enter the generating state.
[0075] When selecting candidate wind turbines to enter the power generation state, the candidate wind turbines can be ranked according to their theoretical active power, which is not currently generating power. For example, they can be ranked in descending order of theoretical active power. Then, the candidate wind turbine with the largest theoretical active power is selected and put into the power generation state. At this point, the sum of the theoretical active power of each wind turbine currently generating power in the wind farm can be recalculated, i.e., the total theoretical active power ∑P can be recalculated. real i And determine the total theoretical active power ∑P real i Is the theoretical active power G greater than the planned total active power of the entire wind farm? If so, then each wind turbine currently generating power in the wind farm can be considered a target wind turbine, and the active power output of each target wind turbine can be adjusted accordingly. If not, then it is necessary to select the candidate wind turbine with the largest theoretical active power from the remaining candidate wind turbines, control that candidate wind turbine to enter the generating state, and recalculate the total theoretical active power ∑P. real i This process is repeated until the calculated total theoretical active power ∑P is obtained. real i Until it exceeds the planned active power G of the entire field.
[0076] When the determined power adjustment strategy is a power increase strategy, the active power controller can determine the adjustment power corresponding to each target wind turbine in the following ways: For each target wind turbine in the wind farm, the first reference power corresponding to the target wind turbine is determined based on the difference between the current pitch angle and the minimum pitch range of the target wind turbine, and the rated power of the target wind turbine; the total first reference power is determined based on the first reference power corresponding to each target wind turbine in the wind farm; furthermore, for each target wind turbine in the wind farm, the adjustment power corresponding to the target wind turbine is determined based on the first reference power corresponding to the target wind turbine, the total first reference power, and the total active power adjustment of the entire wind farm.
[0077] When the determined power adjustment strategy is a power increase strategy, the formula for calculating the adjustment power corresponding to each target wind turbine is shown in equation (1):
[0078]
[0079] Where ΔPi is the adjusted power corresponding to the i-th target wind turbine in the wind farm. βi is the current pitch angle of the i-th target wind turbine, and βmin is the minimum pitch range of the i-th target wind turbine. Let be the rated power of the i-th target wind turbine unit; Let be the first reference power corresponding to the i-th target wind turbine. N is the total number of target wind turbines in the wind farm. ΔP represents the total first reference power, and ΔP represents the adjustment of the active power across the entire field.
[0080] When the determined power adjustment strategy is a power reduction strategy, the active power controller can determine the corresponding adjustment power for each target wind turbine in the wind farm based on the target wind turbine's current pitch angle, maximum pitch range, rated power, and the total active power adjustment of the entire wind farm. It should be understood that the target wind turbine here still refers to the wind turbine in the wind farm that is currently generating electricity.
[0081] When the determined power adjustment strategy is a power reduction strategy, the active power controller can determine the adjustment power corresponding to each target wind turbine in the following ways: For each target wind turbine in the wind farm, the second reference power corresponding to the target wind turbine is determined based on the difference between the maximum pitch range of the target wind turbine and the current pitch angle, as well as the rated power of the target wind turbine; the total second reference power is determined based on the second reference power corresponding to each target wind turbine in the wind farm; furthermore, for each target wind turbine in the wind farm, the adjustment power corresponding to the target wind turbine is determined based on the second reference power corresponding to the target wind turbine, the total second reference power, and the total active power adjustment of the entire wind farm.
[0082] When the determined power adjustment strategy is a power reduction strategy, the formula for calculating the adjustment power corresponding to each target wind turbine is shown in equation (2):
[0083]
[0084] Where ΔPi is the adjusted power corresponding to the i-th target wind turbine in the wind farm. βi is the current pitch angle of the i-th target wind turbine, and βmax is the maximum pitch range of the i-th target wind turbine. Let be the rated power of the i-th target wind turbine unit; Let be the second reference power corresponding to the i-th target wind turbine. N is the total number of target wind turbines in the wind farm. ΔP represents the total second reference power, and ΔP represents the adjustment of the total active power.
[0085] To ensure that the active power output of the wind farm is close to the planned active power of the entire wind farm after adjusting the active power output of each target wind turbine using a power reduction strategy, the active power controller determines the adjustment power corresponding to each target wind turbine currently generating power. Then, for each target wind turbine, the predicted active power is determined based on its active power setpoint in the previous operating cycle and its corresponding adjustment power. The total predicted active power is then determined based on the predicted active power of each target wind turbine. If the predicted active power of each target wind turbine reaches its corresponding lower limit, and the total predicted active power is greater than the planned active power of the entire wind farm, then at least one target wind turbine in the wind farm is shut down.
[0086] Specifically, after the active power controller determines the adjustment power corresponding to each target wind turbine in the wind farm, it can calculate the active power setpoint P for each target wind turbine in the previous working cycle. i n-1 The sum of the adjustment power ΔPi corresponding to the target wind turbine is used to obtain the predicted active power P of the target wind turbine in this working cycle. i n Furthermore, based on the predicted active power of each target wind turbine during its current working cycle, the total predicted active power is calculated. The predicted active power P of each target wind turbine is then used to calculate this total predicted active power. i n If the total predicted active power is still higher than the planned active power G of the entire wind farm, even if the output power of each target wind turbine currently generating power is adjusted to the minimum value, it is difficult to reach the planned active power G of the entire wind farm. In this case, it is necessary to shut down at least one target wind turbine in the wind farm.
[0087] When selecting which target wind turbines to shut down, one can be randomly chosen. After shutting down the target wind turbine, the total predicted active power is recalculated based on the predicted active power of each target wind turbine still generating power. It is then determined whether the total predicted active power is less than the planned active power G for the entire field. If so, control can be implemented on each target wind turbine still generating power, i.e., the output power of each target wind turbine is adjusted accordingly. If not, it is necessary to continue selecting target wind turbines to shut down, and after shutting down the selected target wind turbines, the total predicted active power is recalculated, and it is determined whether the total predicted active power is less than the planned active power G for the entire field, until the calculated total predicted active power is less than the planned active power G for the entire field.
[0088] It should be noted that, to avoid affecting the performance of the target wind turbine due to its active power adjustment not conforming to the adjustment specifications, the active power controller can also limit the adjustment power corresponding to the target wind turbine. Specifically, after determining the adjustment power corresponding to the target wind turbine, it can be determined whether the adjustment power is greater than the maximum power adjustment threshold and less than the minimum power adjustment threshold. If the adjustment power is greater than the maximum power adjustment threshold, the adjustment power can be limited to the maximum power adjustment threshold; if the adjustment power is less than the minimum power adjustment threshold, the adjustment power can be limited to the minimum power adjustment threshold.
[0089] Step 204: Control the output active power of each target wind turbine in the wind farm according to the adjustment power corresponding to each target wind turbine in the wind farm.
[0090] After the active power controller determines the adjustment power corresponding to each target wind turbine in the wind farm, it can adjust the active power setpoint P for each target wind turbine in the wind farm based on the setpoint value P of that target wind turbine in the previous working cycle. i n-1 The active power setpoint of the target wind turbine in the current working cycle is determined by the adjustment power ΔPi corresponding to the target wind turbine; then, for each target wind turbine in the wind farm, the active power output of the target wind turbine is controlled based on the active power setpoint of the target wind turbine in the current working cycle.
[0091] It should be noted that, to avoid unreliable active power setpoints for the target wind turbines, making it difficult to control them to reach the corresponding active power setpoints, the active power controller can also limit the active power setpoints after determining them for the current operating cycle. Specifically, for each target wind turbine in the wind farm, it determines whether the active power setpoint for the target wind turbine in the current operating cycle is greater than its theoretical active power and whether it is less than its minimum output active power. If the active power setpoint for the target wind turbine in the current operating cycle is greater than its theoretical active power, then the active power setpoint is limited to the theoretical active power of the target wind turbine. If the active power setpoint for the target wind turbine in the current operating cycle is less than its minimum output active power, then the active power setpoint is limited to the minimum output active power of the target wind turbine.
[0092] Figure 3 The complete implementation flowchart of the active power control method described above is shown. For the complete implementation flowchart of the active power control method for wind turbines provided in this application embodiment, please refer to... Figure 3 The process is shown below. Figure 3 The steps in the process shown have been described in detail above.
[0093] The aforementioned active power adjustment method no longer uses the theoretical active power of wind turbines as a reference to adjust the active power output of wind turbines in a wind farm. Instead, it innovatively introduces the pitch angle of the wind turbines as a reference for adjusting the active power output. When it is necessary to control the increase of active power output from the wind farm, the active power adjustment amount allocated to the target wind turbine is determined based on the difference between the current pitch angle of the target wind turbine and its minimum pitch range. When it is necessary to control the decrease of active power output from the wind farm, the active power adjustment amount allocated to the target wind turbine is determined based on the difference between the current pitch angle of the target wind turbine and its maximum pitch range. For wind turbines with a large pitch angle margin, more active power adjustment can be allocated, while for wind turbines with a small pitch angle margin, less active power adjustment can be allocated. This allows for a reasonable allocation of active power adjustment, which is beneficial for improving the overall adjustment effect of the wind farm and making the active power output of the wind farm close to the planned active power of the entire farm indicated by the power grid system.
[0094] This application also provides an active power control device for wind turbine generators, see [link to relevant documentation]. Figure 4 , Figure 4 This is a schematic diagram of the active power control device for a wind turbine provided in an embodiment of this application.Figure 4 As shown, the device includes:
[0095] Acquisition unit 401 is used to acquire the total planned active power transmitted by the power grid system.
[0096] The strategy determination unit 402 is used to determine the total active power adjustment amount based on the current grid-connected active power of the wind farm and the total planned active power of the wind farm; and to determine the power adjustment strategy for the wind farm based on the total active power adjustment amount.
[0097] The adjustment amount determination unit 403 is used to determine the adjustment power corresponding to each target wind turbine in the wind farm when the determined power adjustment strategy is a power increase strategy, based on the current pitch angle, minimum pitch range, rated power, and the total active power adjustment amount of the target wind turbine; and to determine the adjustment power corresponding to each target wind turbine in the wind farm when the determined power adjustment strategy is a power decrease strategy.
[0098] The control unit 404 is used to control the output active power of each target wind turbine in the wind farm according to the adjustment power corresponding to each target wind turbine in the wind farm.
[0099] Optionally, the adjustment amount determination unit 403 is further configured to:
[0100] When the determined power adjustment strategy is a power increase strategy, before determining the adjustment power corresponding to the target wind turbine for each target wind turbine in the wind farm based on the current pitch angle, minimum pitch range, rated power, and the total active power adjustment amount of the wind farm, the total theoretical active power is determined based on the theoretical active power of each wind turbine currently generating power in the wind farm.
[0101] When the planned active power of the entire field is greater than the total theoretical active power, the candidate wind turbines in the wind farm that are not in the power generation state are controlled to start and enter the power generation state.
[0102] Each wind turbine in the wind farm that is generating electricity is taken as the target wind turbine.
[0103] Optionally, the adjustment amount determination unit 403 is specifically used for:
[0104] When the determined power adjustment strategy is a power increase strategy, for each target wind turbine in the wind farm, the first reference power corresponding to the target wind turbine is determined based on the difference between the current pitch angle of the target wind turbine and the minimum pitch range, and the rated power of the target wind turbine.
[0105] The total first reference power is determined based on the first reference power corresponding to each of the target wind turbines in the wind farm.
[0106] For each target wind turbine in the wind farm, the adjustment power corresponding to the target wind turbine is determined based on the first reference power corresponding to the target wind turbine, the total first reference power, and the adjustment amount of the active power of the entire farm.
[0107] Optionally, the adjustment amount determination unit 403 is further configured to:
[0108] When the determined power adjustment strategy is a power reduction strategy, after determining the adjustment power corresponding to the target wind turbine for each target wind turbine in the wind farm based on the current pitch angle, maximum pitch range, rated power, and the total active power adjustment amount of the target wind turbine, the predicted active power of the target wind turbine is determined for each target wind turbine in the wind farm based on the active power set value of the target wind turbine in the previous working cycle and the corresponding adjustment power.
[0109] The total predicted active power is determined based on the predicted active power of each target wind turbine in the wind farm.
[0110] If the predicted active power of each target wind turbine in the wind farm reaches its corresponding lower limit of output active power, and the total predicted active power is greater than the planned active power of the entire farm, then at least one target wind turbine in the wind farm will be shut down.
[0111] Optionally, the adjustment amount determination unit 403 is specifically used for:
[0112] When the determined power adjustment strategy is a power reduction strategy, for each target wind turbine in the wind farm, the second reference power corresponding to the target wind turbine is determined based on the difference between the maximum pitch range of the target wind turbine and the current pitch angle, and the rated power of the target wind turbine.
[0113] The total second reference power is determined based on the second reference power corresponding to each of the target wind turbines in the wind farm.
[0114] For each target wind turbine in the wind farm, the adjustment power corresponding to the target wind turbine is determined based on the second reference power corresponding to the target wind turbine, the total second reference power, and the adjustment amount of the active power of the entire farm.
[0115] Optionally, the adjustment amount determination unit 403 is further configured to:
[0116] Determine whether the adjusted power corresponding to the target wind turbine is greater than the maximum power adjustment threshold corresponding to the target wind turbine, and whether it is less than the minimum power adjustment threshold corresponding to the target wind turbine;
[0117] If the adjusted power corresponding to the target wind turbine is greater than the maximum power adjustment threshold corresponding to the target wind turbine, then the adjusted power limit corresponding to the target wind turbine is set to the maximum power adjustment threshold corresponding to the target wind turbine.
[0118] If the adjusted power corresponding to the target wind turbine is less than the minimum power adjustment threshold corresponding to the target wind turbine, then the adjusted power limit corresponding to the target wind turbine is set to the minimum power adjustment threshold corresponding to the target wind turbine.
[0119] Optionally, the control unit 404 is specifically used for:
[0120] For each target wind turbine in the wind farm, the active power setting value of the target wind turbine in the current working cycle is determined based on the active power setting value of the target wind turbine in the previous working cycle and the corresponding adjustment power of the target wind turbine.
[0121] For each target wind turbine in the wind farm, the active power output of the target wind turbine is controlled based on the active power set value of the target wind turbine in the current working cycle.
[0122] Optionally, the control unit 404 is further configured to:
[0123] For each target wind turbine in the wind farm, determine whether the active power set value of the target wind turbine in the current working cycle is greater than the theoretical active power of the target wind turbine, and whether it is less than the minimum output active power of the target wind turbine.
[0124] If the active power set value of the target wind turbine in the current working cycle is greater than the theoretical active power of the target wind turbine, then the active power set value is limited to the theoretical active power of the target wind turbine.
[0125] If the active power setting value of the target wind turbine in the current working cycle is less than the minimum output active power of the target wind turbine, then the active power setting value is limited to the minimum output active power of the target wind turbine.
[0126] The aforementioned active power adjustment device no longer uses the theoretical active power of the wind turbine as a reference to adjust the active power output of the wind turbine in the wind farm. Instead, it innovatively introduces the pitch angle of the wind turbine as a reference for adjusting the active power output. When it is necessary to control the increase of the active power output of the wind farm, the active power adjustment amount allocated to the target wind turbine is determined based on the difference between the current pitch angle of the target wind turbine and its minimum pitch range. When it is necessary to control the decrease of the active power output of the wind farm, the active power adjustment amount allocated to the target wind turbine is determined based on the difference between the current pitch angle of the target wind turbine and its maximum pitch range. For wind turbines with a large pitch angle margin, more active power adjustment can be allocated, while for wind turbines with a small pitch angle margin, less active power adjustment can be allocated. This allows for a reasonable allocation of active power adjustment, which is beneficial for improving the overall adjustment effect of the wind farm and making the active power output of the wind farm close to the planned active power of the entire farm indicated by the power grid system.
[0127] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.
[0128] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection between apparatuses or units through some interfaces, and may be electrical, mechanical, or other forms.
[0129] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.
[0130] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.
[0131] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes: USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, optical disks, and other media capable of storing computer programs.
[0132] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.
[0133] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.
Claims
1. A method for controlling the active power of a wind turbine generator, characterized in that, The method includes: Obtain the planned active power for the entire field sent by the power grid system; Based on the current on-grid active power of the wind farm and the planned active power of the entire farm, determine the adjustment amount of the active power of the entire farm; and based on the adjustment amount of the active power of the entire farm, determine the power adjustment strategy for the wind farm. When the determined power adjustment strategy is a power increase strategy, for each target wind turbine in the wind farm, the adjustment power corresponding to the target wind turbine is determined based on the target wind turbine's current pitch angle, minimum pitch range, rated power, and the total active power adjustment amount of the entire wind farm; when the determined power adjustment strategy is a power decrease strategy, for each target wind turbine in the wind farm, the adjustment power corresponding to the target wind turbine is determined based on the target wind turbine's current pitch angle, maximum pitch range, rated power, and the total active power adjustment amount of the entire wind farm. Based on the adjustment power corresponding to each of the target wind turbines in the wind farm, control the output active power of each of the target wind turbines in the wind farm; The determination of the adjustment power corresponding to each target wind turbine in the wind farm, based on the target wind turbine's current pitch angle, minimum pitch range, rated power, and the overall active power adjustment, includes: For each target wind turbine in the wind farm, the first reference power corresponding to the target wind turbine is determined based on the current pitch angle, the minimum pitch range, and the rated power of the target wind turbine. The total first reference power is determined based on the first reference power corresponding to each of the target wind turbines in the wind farm. For each target wind turbine in the wind farm, the adjustment power corresponding to the target wind turbine is determined based on the first reference power corresponding to the target wind turbine, the total first reference power, and the adjustment amount of the active power of the entire farm.
2. The method according to claim 1, characterized in that, When the determined power adjustment strategy is a power-up strategy, before determining the adjustment power corresponding to each target wind turbine in the wind farm based on the current pitch angle, minimum pitch range, rated power, and the total active power adjustment of the wind farm, the method further includes: The total theoretical active power is determined based on the theoretical active power of each wind turbine currently generating power in the wind farm. When the planned active power of the entire field is greater than the total theoretical active power, the candidate wind turbines in the wind farm that are not in the power generation state are controlled to start and enter the power generation state. Each wind turbine in the wind farm that is generating electricity is taken as the target wind turbine.
3. The method according to claim 1 or 2, characterized in that, The determination of the adjustment power corresponding to each target wind turbine in the wind farm, based on the target wind turbine's current pitch angle, minimum pitch range, rated power, and the overall active power adjustment, includes: For each target wind turbine in the wind farm, the first reference power corresponding to the target wind turbine is determined based on the difference between the current pitch angle and the minimum pitch range of the target wind turbine, and the rated power of the target wind turbine. The total first reference power is determined based on the first reference power corresponding to each of the target wind turbines in the wind farm. For each target wind turbine in the wind farm, the adjustment power corresponding to the target wind turbine is determined based on the first reference power corresponding to the target wind turbine, the total first reference power, and the adjustment amount of the active power of the entire farm.
4. The method according to claim 1, characterized in that, When the determined power adjustment strategy is a power reduction strategy, after determining the adjustment power corresponding to each target wind turbine in the wind farm based on the current pitch angle, maximum pitch range, rated power, and the total active power adjustment of the wind farm, the method further includes: For each target wind turbine in the wind farm, the predicted active power of the target wind turbine is determined based on the active power set value of the target wind turbine in the previous working cycle and the corresponding adjustment power of the target wind turbine. The total predicted active power is determined based on the predicted active power of each target wind turbine in the wind farm. If the predicted active power of each target wind turbine in the wind farm reaches its corresponding lower limit of output active power, and the total predicted active power is greater than the planned active power of the entire farm, then at least one target wind turbine in the wind farm will be shut down.
5. The method according to claim 1 or 4, characterized in that, The determination of the adjustment power corresponding to each target wind turbine in the wind farm, based on the target wind turbine's current pitch angle, maximum pitch range, rated power, and the overall active power adjustment, includes: For each target wind turbine in the wind farm, the second reference power corresponding to the target wind turbine is determined based on the difference between the maximum pitch range of the target wind turbine and the current pitch angle, as well as the rated power of the target wind turbine. The total second reference power is determined based on the second reference power corresponding to each of the target wind turbines in the wind farm. For each target wind turbine in the wind farm, the adjustment power corresponding to the target wind turbine is determined based on the second reference power corresponding to the target wind turbine, the total second reference power, and the adjustment amount of the active power of the entire farm.
6. The method according to claim 1, characterized in that, The method further includes: Determine whether the adjusted power corresponding to the target wind turbine is greater than the maximum power adjustment threshold corresponding to the target wind turbine, and whether it is less than the minimum power adjustment threshold corresponding to the target wind turbine; If the adjusted power corresponding to the target wind turbine is greater than the maximum power adjustment threshold corresponding to the target wind turbine, then the adjusted power limit corresponding to the target wind turbine is set to the maximum power adjustment threshold corresponding to the target wind turbine. If the adjusted power corresponding to the target wind turbine is less than the minimum power adjustment threshold corresponding to the target wind turbine, then the adjusted power limit corresponding to the target wind turbine is set to the minimum power adjustment threshold corresponding to the target wind turbine.
7. The method according to claim 1, characterized in that, The step of controlling the output active power of each target wind turbine in the wind farm according to the adjustment power corresponding to each target wind turbine in the wind farm includes: For each target wind turbine in the wind farm, the active power setting value of the target wind turbine in the current working cycle is determined based on the active power setting value of the target wind turbine in the previous working cycle and the corresponding adjustment power of the target wind turbine. For each target wind turbine in the wind farm, the active power output of the target wind turbine is controlled based on the active power set value of the target wind turbine in the current working cycle.
8. The method according to claim 7, characterized in that, The method further includes: For each target wind turbine in the wind farm, determine whether the active power set value of the target wind turbine in the current working cycle is greater than the theoretical active power of the target wind turbine, and whether it is less than the minimum output active power of the target wind turbine. If the active power set value of the target wind turbine in the current working cycle is greater than the theoretical active power of the target wind turbine, then the active power set value is limited to the theoretical active power of the target wind turbine. If the active power setting value of the target wind turbine in the current working cycle is less than the minimum output active power of the target wind turbine, then the active power setting value is limited to the minimum output active power of the target wind turbine.
9. An active power control device for a wind turbine generator, characterized in that, The device includes: The acquisition unit is used to acquire the total planned active power transmitted by the power grid system. The strategy determination unit is used to determine the total active power adjustment amount based on the current grid-connected active power of the wind farm and the total planned active power of the wind farm; and to determine the power adjustment strategy for the wind farm based on the total active power adjustment amount. The adjustment amount determination unit is used to determine the adjustment power corresponding to each target wind turbine in the wind farm when the determined power adjustment strategy is a power increase strategy, based on the current pitch angle, minimum pitch range, rated power, and the total active power adjustment amount of the target wind turbine; and to determine the adjustment power corresponding to each target wind turbine in the wind farm when the determined power adjustment strategy is a power decrease strategy. The control unit is used to control the output active power of each target wind turbine in the wind farm according to the adjustment power corresponding to each target wind turbine in the wind farm. The adjustment amount determination unit is specifically used for: For each target wind turbine in the wind farm, the first reference power corresponding to the target wind turbine is determined based on the current pitch angle, the minimum pitch range, and the rated power of the target wind turbine. The total first reference power is determined based on the first reference power corresponding to each of the target wind turbines in the wind farm. For each target wind turbine in the wind farm, the adjustment power corresponding to the target wind turbine is determined based on the first reference power corresponding to the target wind turbine, the total first reference power, and the adjustment amount of the active power of the entire farm.
10. An active power control system for a wind turbine generator, characterized in that, The system includes: a power grid system, an active power controller, and a wind turbine generator; The power grid system is used to send active power adjustment commands to the active power controller; the active power adjustment commands include the planned active power for the entire field. The active power controller is used to execute the active power control method of the wind turbine generator as described in any one of claims 1 to 8; The wind turbine is used to respond to the control of the active power controller and output active power.