CN117424254A

CN117424254A - Power control method and device for wind power plant

Info

Publication number: CN117424254A
Application number: CN202311441429.XA
Authority: CN
Inventors: 左美灵
Original assignee: Jinfeng Technology Co ltd
Current assignee: Jinfeng Technology Co ltd
Priority date: 2023-10-31
Filing date: 2023-10-31
Publication date: 2024-01-19

Abstract

A power control method and device for a wind farm are provided. The power control method is used for primary frequency modulation anti-reverse control of the fan and comprises the following steps: acquiring the actual shortage of the total power required to be regulated by the wind farm; when the wind farm is in the process after the primary frequency modulation is finished and the total power actual lack is greater than zero, periodically executing the following steps until the power distribution corresponding to the total power actual lack is completed: calculating the power demand up-regulation quantity of the current control period based on the total power actual shortage; calculating the single power up-regulating quantity of each fan based on the current control period power demand up-regulating quantity and the variable pitch up-regulating power of each fan of the wind power plant; and transmitting corresponding single-machine power up-regulating quantity to each fan so as to finish the power distribution of the current control period.

Description

Power control method and device for wind power plant

Technical Field

The present disclosure relates generally to the field of power technology, and more particularly, to a method and apparatus for power control of a wind farm.

Background

In the related art of power supply by using a wind farm, automatic power generation control (AGC) may represent that the power generation output is adjusted in real time according to a certain adjustment rate by implementing an automatic control program within a specified output adjustment range for the wind farm, tracking an instruction issued by a power dispatching transaction mechanism, so as to meet the service required by power system frequency and link power control. Primary frequency modulation (PFR) may represent a control function of the power plant to adjust the active force to reduce the frequency deviation by controlling the system's automatic response when the power system frequency deviates from the target frequency.

In the scenario of using a wind farm as a power plant to provide power, as primary frequency modulation technology related to the wind farm is continuously spread from the initial domestic northwest power grid, northeast power grid and other test points, the wind farm has become a mandatory grid connection requirement at present, and the requirements on related technologies are becoming more and more stringent. With the massive operation of the wind driven generator set, the stage of adapting the primary frequency modulation technology to the wind driven generator set is reached. Accordingly, there is a need for an improved method of power control for a wind farm that meets the above and other needs.

Disclosure of Invention

The exemplary embodiment of the disclosure provides a power control method and device for a wind power plant, which can effectively inhibit primary frequency modulation power drop of the wind power plant.

According to an aspect of the embodiments of the present disclosure, there is provided a power control method of a wind farm, the power control method being used for primary frequency modulation anti-reverse control of a wind turbine and including: acquiring the actual shortage of the total power required to be regulated by the wind farm; when the wind farm is in the process after the primary frequency modulation is finished and the total power actual lack is greater than zero, periodically executing the following steps until the power distribution corresponding to the total power actual lack is completed: calculating the power demand up-regulation quantity of the current control period based on the total power actual shortage; calculating the single power up-regulating quantity of each fan based on the current control period power demand up-regulating quantity and the variable pitch up-regulating power of each fan of the wind power plant; and transmitting corresponding single-machine power up-regulating quantity to each fan so as to finish the power distribution of the current control period.

Optionally, the variable pitch up-tunable power may include a first variable pitch up-tunable power and a second variable pitch up-tunable power, where, in a case where a difference between an average pitch angle of all fans and a minimum pitch angle of all fans is smaller than a preset pitch angle position threshold, the first variable pitch up-tunable power is equal to a product of a first preset variable pitch up-tunable power per unit time of a corresponding fan, a first preset duration, and a first conversion deviation coefficient, and in a case where a difference between the average pitch angle and the minimum pitch angle is greater than or equal to the preset pitch angle position threshold, the second variable pitch up-tunable power is equal to a product of a second preset variable pitch up-tunable power per unit time of the corresponding fan, a second preset duration, and a second conversion deviation coefficient, where the preset pitch angle position threshold represents a value of a pitch angle position of a fan stall switching rate, so that the fan can be decelerated in advance before the pitch angle becomes the minimum pitch angle, to achieve fan stall suppression.

Alternatively, the step of calculating the amount of stand-alone power up-regulation of each fan may be performed in response to the following preset condition being satisfied: the average pitch angle of all fans is larger than the product of the minimum pitch angle of all fans and the power drop pitch angle multiple coefficient, wherein when the minimum pitch angle is smaller than zero, the minimum pitch angle is set to be a preset value larger than zero, and the power drop pitch angle multiple coefficient represents the stall pitch angle multiple coefficient for amplifying the reserved deviation between the pitch angle of the fans and the minimum pitch angle, so that the fan stall inhibition is realized.

Optionally, the step of calculating the single power up-regulation of each fan may include: calculating the product of the up-regulation weight coefficient of each fan and the up-regulation quantity of the power demand of the current control period to serve as the single-machine power up-regulation quantity of the corresponding fan, wherein the up-regulation weight coefficient of each fan is as follows: the ratio of the variable pitch up-regulating power capacity of each fan to the sum of the variable pitch up-regulating power capacities of the fans corresponds to the first difference value of each fan and the rated power, and the first difference value is the product of the average pitch angle of all fans minus the minimum pitch angle of all fans and the power drop pitch angle speed coefficient.

Optionally, after the step of calculating the single power up-adjustment amount of each fan, the power control method may further include: for each fan, the following steps are executed: determining the minimum value of variable pitch up-adjustable power of a corresponding fan and a preset up-adjustable power threshold of the corresponding fan as a first result value; determining a first result value and a calculated minimum value of the single machine power up-regulating quantity of the corresponding fan as a second result value; and updating the single power up-regulating quantity of the corresponding fan to the second result value.

Optionally, after determining the second result value, the power control method may further include: and calculating the product of the second result value and a preset power drop low coefficient of the corresponding fan aiming at each fan to obtain a third result value, and updating the single machine power up-regulating quantity of the corresponding fan to the third result value, wherein the preset power drop low coefficient can reduce the speed of the power control so as to further inhibit the stall of the fan.

Optionally, after the step of calculating the third result value, the power control method may further include: calculating the sum of a third result value and a preset deviation correction value of the corresponding fan aiming at each fan to obtain a fourth result value, and updating the single power up-regulating quantity of the corresponding fan to the fourth result value, wherein the preset deviation correction value of each fan is as follows: the difference value between the current actual power value of the corresponding fan and the initial power value of the corresponding fan at the beginning of the current power grid frequency disturbance.

According to another aspect of the embodiments of the present disclosure, there is provided a power control device for a wind farm, the power control device being used for primary frequency modulation anti-reverse control of a wind turbine and including: an acquisition unit configured to: acquiring the actual shortage of the total power required to be regulated by the wind farm; a power allocation control unit configured to: when the wind farm is in the process after the primary frequency modulation is finished and the total power actual lack is greater than zero, periodically executing the following steps until the power distribution corresponding to the total power actual lack is completed: calculating the power demand up-regulation quantity of the current control period based on the total power actual shortage; calculating the single power up-regulating quantity of each fan based on the current control period power demand up-regulating quantity and the variable pitch up-regulating power of each fan of the wind power plant; and transmitting corresponding single-machine power up-regulating quantity to each fan so as to finish the power distribution of the current control period.

Optionally, the variable pitch up-tunable power may include a first variable pitch up-tunable power and a second variable pitch up-tunable power, where the first variable pitch up-tunable power is equal to a product of a first preset variable pitch up-tunable power per unit time of a corresponding fan, a first preset duration, and a first conversion deviation coefficient in a case where a difference between the average pitch angle and the minimum pitch angle is greater than or equal to the preset pitch angle position threshold, and the second variable pitch up-tunable power is equal to a product of a second preset variable pitch up-tunable power per unit time of the corresponding fan, a second preset duration, and a second conversion deviation coefficient in a case where a difference between the average pitch angle and the minimum pitch angle is less than or equal to the preset pitch angle position threshold.

Alternatively, the power allocation control unit may be configured to: and executing operation of calculating the single machine power up-regulating quantity of each fan in response to the following preset condition: the average pitch angle of all fans is larger than the product of the minimum pitch angle of all fans and the power drop pitch angle speed coefficient, wherein when the minimum pitch angle is smaller than zero, the minimum pitch angle is set to be a preset value larger than zero.

Optionally, the operation of the power distribution control unit calculating the single power up-regulation amount of each fan may include: calculating the product of the up-regulation weight coefficient of each fan and the up-regulation quantity of the power demand of the current control period to serve as the single-machine power up-regulation quantity of the corresponding fan, wherein the up-regulation weight coefficient of each fan is as follows: the ratio of the variable pitch up-regulating power capacity of each fan to the sum of the variable pitch up-regulating power capacities of the fans corresponds to the first difference value of each fan and the rated power, and the first difference value is the product of the average pitch angle of all fans minus the minimum pitch angle of all fans and the power drop pitch angle speed coefficient.

Optionally, the power allocation control unit may be further configured to: after the step of calculating the single power up-regulation amount of each fan, the following operations are performed for each fan: determining the minimum value of variable pitch up-adjustable power of a corresponding fan and a preset up-adjustable power threshold of the corresponding fan as a first result value; determining a first result value and a calculated minimum value of the single machine power up-regulating quantity of the corresponding fan as a second result value; and updating the single power up-regulating quantity of the corresponding fan to the second result value.

Optionally, the power allocation control unit may be further configured to: after the second result value is determined, calculating the product of the second result value and the preset power drop coefficient of the corresponding fan for each fan to obtain a third result value, and updating the single machine power up-regulating quantity of the corresponding fan to the third result value.

Optionally, the power allocation control unit may be further configured to: after the operation of calculating the third result value, calculating the sum of the third result value and a preset deviation correction value of the corresponding fan for each fan to obtain a fourth result value, and updating the single power up-regulating quantity of the corresponding fan to the fourth result value, wherein the preset deviation correction value of each fan is as follows: the difference value between the current actual power value of the corresponding fan and the initial power value of the corresponding fan at the beginning of the current power grid frequency disturbance.

Optionally, the power allocation control unit may be further configured to: when the wind farm is in the process after the primary frequency modulation is finished and the total power actual lack is less than zero, periodically executing the following steps until the power distribution corresponding to the total power actual lack is completed: calculating the power demand down-regulation amount of the current control period based on the total power actual shortage; calculating the single power down-regulating quantity of each fan based on the current control period power demand down-regulating quantity and the variable pitch down-regulated power of each fan of the wind power plant; and issuing corresponding single-machine power down-regulating quantity to each fan so as to finish the power distribution of the current control period.

Optionally, the power allocation control unit may be further configured to: after the operation of calculating the single power down-regulation amount of each fan, the following operations are performed for each fan: determining the minimum value of the variable pitch power capable of being adjusted downwards of the corresponding fan and the preset power threshold capable of being adjusted downwards of the corresponding fan, and taking the minimum value as a fifth result value; determining the minimum value of the fifth result value and the absolute value of the calculated single machine power down-regulating quantity of the corresponding fan as a sixth result value; and updating the single power down-regulating quantity of the corresponding fan to the sixth result value.

Optionally, the power allocation control unit may be further configured to: after calculating the sixth result value, calculating the sum of the sixth result value and a preset deviation correction value of the corresponding fan for each fan to obtain a seventh result value, and updating the single machine power down-regulating quantity of the corresponding fan to the seventh result value, wherein the preset deviation correction value of each fan is as follows: the difference value between the current actual power value of the corresponding fan and the initial power value of the corresponding fan at the beginning of the current power grid frequency disturbance.

Optionally, the power control device is provided in a controller of the wind farm.

According to another aspect of the disclosed embodiments, there is provided a computer-readable storage medium, which when executed by at least one processor, causes the at least one processor to perform the power control method as described above.

According to another aspect of the disclosed embodiments, there is provided a computer apparatus including: at least one processor; at least one memory storing computer-executable instructions, wherein the computer-executable instructions, when executed by the at least one processor, cause the at least one processor to perform the power control method as described above.

Alternatively, the computer device may be provided in a controller of a wind farm.

According to the power control method and device of the wind power plant, the power up-regulating quantity of the related wind power generator and the variable pitch power can be controlled to effectively distribute the up-regulating power output by the wind power plant, so that the power grid frequency modulation requirement can be effectively met, and the power drop of primary frequency modulation of the wind power plant can be effectively restrained.

In addition, through the power control method and the device of the wind power plant, the effect of double-layer power drop inhibition can be achieved through the minimum pitch angle limiting space and buffer pitch angle control. In addition, by the power control method and the device of the wind power plant, the gradual replacement of the rapid control of primary frequency modulation and the slow control of uniform power drop can be realized.

Additional aspects and/or advantages of the present general inventive concept will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the general inventive concept.

Drawings

The foregoing and other objects and features of exemplary embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings which illustrate the embodiments by way of example, in which:

FIG. 1 illustrates a flowchart of a method of power control of a wind farm according to an exemplary embodiment of the present disclosure;

FIG. 2 illustrates a flowchart of a method of power control of a wind farm according to another exemplary embodiment of the present disclosure;

FIG. 3 illustrates a topology of a wind farm according to an exemplary embodiment of the present disclosure;

FIG. 4 illustrates an example of primary frequency droop control according to an example embodiment of the present disclosure;

FIG. 5 illustrates an example of a primary frequency modulation step response index in accordance with an exemplary embodiment of the present disclosure;

FIG. 6 illustrates an example of a primary frequency modulation mode according to an exemplary embodiment of the present disclosure;

FIG. 7 illustrates an example of a single cycle instruction splitting method according to an exemplary embodiment of the present disclosure;

FIG. 8 illustrates a flow chart of a pitch angle scaling algorithm for up-regulating power distribution according to an exemplary embodiment of the present disclosure;

Fig. 9 illustrates a power setting flow chart for up-regulating power allocation in accordance with an exemplary embodiment of the present disclosure;

FIG. 10 illustrates a flow chart of a pitch angle scaling algorithm for downregulating power allocation for a wind farm according to an exemplary embodiment of the present disclosure;

fig. 11 illustrates a power setting flow chart for down-regulating power allocation in accordance with an exemplary embodiment of the present disclosure;

FIG. 12 illustrates a block diagram of a power control device of a wind farm according to an exemplary embodiment of the present disclosure;

FIG. 13 illustrates a block diagram of a computer device in accordance with an exemplary embodiment of the present disclosure;

fig. 14 illustrates the prior art fringing of primary frequency modulated power in a wind farm.

Detailed Description

Reference will now be made in detail to embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. The embodiments will be described below in order to explain the present disclosure by referring to the figures.

As mentioned in the above description, currently, with the massive operation of wind turbine units, a stage of efficient adaptation of the primary frequency modulation technique to the wind turbine unit has been reached. The primary purpose of the present disclosure is to solve the problem that the primary frequency modulation power of a wind farm falls down, which results in that the pre-verification of the wind farm does not pass. For example, an example of a wind farm primary power sag problem resulting in a wind farm's pre-acceptance failing may be: the power drop condition exists when the free power generation working condition has power recovery in the test process of the wind power plant, and when the predetermined speed (for example, the speed values are 100, 200 and 300) is tested, the power drop exists; the high power section limited power working condition is that the frequency modulation power reduction has reverse modulation and can not be quickly reduced to a preset value. As shown in fig. 14, fig. 14 illustrates a problem of a primary frequency modulation power drop of a wind farm in the prior art, in fig. 14, a horizontal value as an abscissa represents time, a vertical value as an ordinate represents power, an orange curve represents power corresponding to a scheduling instruction of a grid AGC, and a blue curve represents active power of a fan in the wind farm. Referring to fig. 14, in the wind farm test shown in fig. 14, in the case where the frequency modulation rate shown in the test chart is 100 and the delay is 5.7 seconds to exit at the end of the frequency modulation (T1 shown in fig. 14), the power starts to drop after 10 seconds from the end of the frequency modulation and reaches the power drop valley at 14 seconds from the end of the frequency modulation (T2 shown in fig. 14).

In the present disclosure, "reverse modulation" refers to that the active power emitted by a fan in a wind farm within a predetermined period of time after the end of primary modulation cannot be increased or decreased according to the grid AGC scheduling instruction, i.e., there may be an unexpected up-or down-modulation of the active power actually emitted by the fan. As an example, referring to fig. 14, the active power emitted by a fan in a wind farm for a predetermined period of time after the end of a primary frequency modulation (e.g., as shown by the portion of the blue curve in fig. 14 that is recessed down toward the right) cannot be increased in accordance with the grid AGC schedule instruction (e.g., as shown by the orange curve in fig. 14), i.e., there is an unexpected downregulation of the active power actually emitted by the fan.

In addition, since the speed requirement for primary frequency modulation is fast, the accuracy requirement for primary frequency modulation is high in accuracy and reverse modulation cannot occur, and a wind driven generator (which can be called a fan for short) is prone to power drop.

The primary frequency modulation power drop problem that the fan stall led to is mainly solved to this scheme embodiment. In the actual running process of the wind generating set, under a certain working condition, the condition of blade stall possibly exists, wherein the blade stall causes the lift force of the blade to be reduced, the resistance to be increased and the capability of the blade to absorb wind energy to be drastically reduced, so that the output power of the wind generating set is greatly different from the power design value. For wind farms, a significant loss of power production will result after blade stall occurs. For example, at certain wind speeds, a power dip occurs near the power level that the fan should be able to reach. Therefore, according to the power control method disclosed by the invention, the pitch angle is controlled in a related way by combining a small step strategy, so that when the control speed is low and/or the minimum pitch angle from the power drop has a set margin, the influence caused by the power drop due to the stall of the fan can be avoided or slowed down.

The power control method and apparatus of the wind farm according to the present disclosure are specifically described below with reference to fig. 1 to 12.

Fig. 1 shows a flowchart of a method of power control of a wind farm according to an exemplary embodiment of the present disclosure.

As an example, a wind farm may include a plurality of wind power generation units (which may be abbreviated as units), each of which may include one or more wind power generators (which may be abbreviated as fans). The units/fans of the wind farm are connected to the power grid in a suitable manner.

As an example, a power control method of a wind farm according to an exemplary embodiment of the present disclosure may be performed by a farm level controller of the wind farm. For example, the field level controller may include a Voltage Management Platform (VMP).

The topology of a wind farm to which the present disclosure applies is briefly explained below with reference first to fig. 3 to 5. Fig. 3 illustrates a topology of a wind farm according to an exemplary embodiment of the present disclosure. Fig. 4 illustrates an example of primary frequency droop control according to an exemplary embodiment of the present disclosure. Fig. 5 illustrates an example of a primary frequency modulation step response index according to an exemplary embodiment of the present disclosure.

Referring to fig. 3, a farm level controller of a wind farm (e.g., the wind farm station control system shown in fig. 3) as an upper layer control device (which may be referred to as a farm control device) of the wind farm is capable of monitoring grid-connected point data and centrally controlling all wind generator sets/fans. Further, the specific functions of the field control device mainly comprise four aspects of grid-connected point integral demand target planning control instruction calculation, fan single machine and full-field adjustable power margin (standby power) calculation, a control instruction distribution method and unit instruction issuing.

According to examples of the present disclosure, the primary function of field level controller control may include primary frequency modulation. For example, under the condition of high-frequency disturbance of a wind power plant power grid, the primary frequency modulation action quantity can not be adjusted downwards after reaching 10% of rated output, and under the condition of low-frequency disturbance of the power grid, the primary frequency modulation action quantity can not be adjusted upwards (10% and 6% are recommended set values) after reaching 6% of rated output. The primary frequency modulation droop characteristic is realized by setting a frequency and active power broken line function, and the primary frequency modulation droop characteristic is shown in the following formula (1):

wherein P represents the full-field power target value which needs to be reached by primary frequency modulation, and the unit is MW. f (f) _d Represents the primary frequency modulation dead zone in Hz. f (f) _N The rated frequency of the power grid system is expressed in Hz. P (P) _N Rated power in MW. Delta% represents the primary frequency modulation difference coefficient of the new energy. P (P) ₀ Represents the primary frequency modulation full-field active initial value, and the unit is MW. f represents the current actual frequency of the grid.

For example, the primary frequency modulation dead zone is set to 0.05Hz, the difference adjustment coefficient is set to 5%, and the primary frequency modulation power is adjusted to a maximum power limit of 6%P _N Regulating maximum power limiting limit to 10% P under primary frequency modulation power _N In the case of a wind farm participating in grid primary frequency modulation, the droop curve may be as shown in fig. 4.

Further, a primary frequency modulation step response index according to an example of the present disclosure may be as shown in fig. 5.

In FIG. 5, t ₀ Indicating the start time, t _d Indicating the start-up time, t _up Represents response time, t _s Represents the adjustment time, P _N Indicating rated power and Δp indicating target power adjustment amount.

Referring back to fig. 1, fig. 1 illustrates a method 100 of power control of a wind farm according to an exemplary embodiment of the present disclosure. According to embodiments of the present disclosure, the power control method 100 of a wind farm may be used for primary frequency modulation anti-reverse modulation control of a wind turbine.

In step S101, the actual lack of total power that needs to be regulated by the wind farm is obtained.

As an example, the actual lack of total power that requires wind farm adjustment due to the frequency and/or frequency change rate of the grid tie-in point may be determined periodically from the beginning of the current grid frequency disturbance (e.g., the frequency of the grid tie-in point exceeding the frequency dead zone or the frequency change rate of the grid tie-in point exceeding the frequency change rate dead zone) to the end of the current grid frequency disturbance.

In step S102, it is determined whether the wind farm is in the process after the primary frequency modulation is finished and whether the total power actual shortage is greater than zero.

It should be noted that wind farm related power control based on the frequency and the frequency change rate of the grid-connected point may include primary frequency modulation control, inertia response control, and fast power control, etc., and the present disclosure mainly performs power control for primary frequency modulation control, and further power control (e.g., inertia response control and fast power control, etc.) will not be described in detail.

Fig. 6 illustrates an example of a primary frequency modulation mode according to an exemplary embodiment of the present disclosure, according to an exemplary embodiment of the present disclosure. The primary frequency modulation control in the present disclosure includes two closed loop control flows, namely, power closed loop control and small step size multiple iteration control. Referring to FIG. 6, the control flow to implement two closed loops includes real-time total power deficiency, small step control calculations, pitch angle ratio algorithm, and issuing unit control instructions.

According to embodiments of the present disclosure, the core concept of the "small step control calculation" is: the machine set with the pitch angle adjusting capability calculates the maximum power adjustable in a single period according to the preset adjusting speed, and then carries out iterative segmentation execution according to the actual demand and the maximum power adjustable in the single period.

According to an embodiment of the present disclosure, the core concept of the "pitch angle scaling algorithm" is: and after the pitch angles of all the units, rated power and the like are weighted, the weight ratio of the pitch angle condition of each fan in the whole field is calculated, and the required target plan value is distributed according to the weight ratio. Specifically, the pitch angle of the unit can be changed when the power is limited, the pitch angle is approximately proportional to the power limiting depth, and the pitch angle is not changed when free power generation is performed. Therefore, according to the forward proportion relation, the weight proportion of the power of each fan under the condition of the current pitch angle can be calculated, and then the power is adjusted according to the weight, so that the purpose of distribution control is realized.

Furthermore, the frequency and power of the grid-connected point are double closed loops, and the power is added with small step length for multiple iterations, so that multi-layer cascade control is realized. Specifically, the closed loop of the frequency and the frequency change rate of the grid-connected point is the outermost loop control, the closed loop of the total power of the full-field grid-connected point or the active power of the fan is the middle loop control, and the repeated iteration control with small step length is the innermost loop control.

According to the embodiment of the disclosure, since the phenomenon of power sag has close relation with the positions of the power up-regulation and the pitch angle, the disclosure provides a method for realizing power control by gradually approaching from the pitch angle, reserving a certain space and assisting in a mode that the speed is continuously reduced along with the approaching of the pitch angle. Compared with a large-step power regulation algorithm, the method adopts a small-step fast regulation mode, can gradually approach, and can more accurately master the position of the pitch angle in the regulation process, thereby preventing power drop in advance.

According to an embodiment of the present disclosure, when the process that the wind farm is after the end of the primary frequency modulation and the total power actual absence is greater than zero is satisfied at step S102, steps S103 to S105 are periodically performed until the power allocation corresponding to the total power actual absence is completed (as shown in step S106).

Specifically, in step S103, the current control period power demand up-regulation amount is calculated based on the total power actual absence.

In step S104, the stand-alone power up-regulation amount of each fan is calculated based on the current control period power demand up-regulation amount and the variable pitch up-regulated power of each fan of the wind farm.

As an example, the step of calculating the amount of stand-alone power up-regulation of each fan may be performed in response to the following preset condition being satisfied: the average pitch angle of all fans is greater than the product of the minimum pitch angle of all fans and the power drop pitch angle multiplier, wherein the minimum pitch angle is set to a predetermined value greater than zero when the minimum pitch angle is less than zero. By the above-mentioned preset conditions, a certain minimum space (i.e. a minimum margin for the pitch angle) can be reserved between the average pitch angle and the minimum pitch angle, and by means of early deceleration before reaching the minimum margin reserved for the pitch angle, buffering for power control can also be achieved and a buffering space is reserved.

As an example, regarding a single cycle control instruction for a blower, the following may be defined: because of the response rate issued to the fan, a certain error may exist in the executing process of the fan, and in the small-step fast-tuning process, in order to avoid power oscillation, a deviation mode that the preset rate is slightly lower than the actual issuing rate to the unit is adopted to realize.

Specifically, the single cycle control instruction DeltPReal segmentation method is shown in FIG. 7. Referring to fig. 7, in case deltaseal is greater than zero, that is, in case an up-regulation power allocation is required, if the up-regulation demand value is greater than the single-period up-tunable power oneycleuppower, power allocation is performed according to the single-period up-tunable power oneycleuppower; if the up-regulation requirement value is smaller than the one-cycle up-regulated power OneClycleUpPower, power distribution is carried out according to the actual requirement DeltPReal. In addition, the case of the power allocation to be adjusted down is similar to that of the power allocation to be adjusted up, and will not be described here again.

In order to more effectively cope with power sag under the condition of up-regulated power, the single-period adjustable power is optimized by the method, and the specific conception is as follows: 1) The average pitch angle and the minimum pitch angle reserve a certain minimum space, and as the control between the average pitch angle and the minimum pitch angle is nonlinear with different working conditions, fixed deviation cannot be adopted, and the method is realized by adopting a mode of amplifying the reserved space by a multiple coefficient; 2) Before the minimum margin is reserved for the pitch angle, buffering is realized by adopting a mode of early deceleration, and a certain buffering space is increased.

Specifically, first, the clipping of the pitch angle is increased, and when the pitch angle MinPitPos is <0, the MinPitPos is limited to 0.1, and such setting can avoid the problem that the negative number causes the multiple coefficient to fail. Second, the constraint of performing the calculation is increased, that is, the average pitch angle PitchAvg > minimum pitch angle minpitpos×power-sag pitch angle double-speed coefficient stalllimit pitchcoeff, the calculation is performed.

Furthermore, when (average pitch angle PitchAvg-minimum pitch angle MinPitPos) < pitch angle position SwitchSpeedPitPos of the power-droop switching rate, the single-cycle execution rate is switched to slow ExecutionRateSlow.

The step of calculating the up-regulation amount of the single power of each fan is specifically described below according to the above-mentioned optimization mode.

As an example, the pitch up-tunable power may include a first pitch up-tunable power and a second pitch up-tunable power.

Specifically, when the difference between the average pitch angles of all fans and the minimum pitch angle of all fans is smaller than the preset pitch angle position threshold, the first variable pitch up-adjustable power is equal to the product of the first preset variable pitch up-adjustable power, the first preset duration and the first conversion deviation coefficient of the corresponding fans in unit time. According to an embodiment of the present disclosure, the preset pitch angle position threshold value represents a value of a pitch angle position of the fan stall switching rate such that the fan can be decelerated in advance before the pitch angle becomes the minimum pitch angle to achieve fan stall suppression.

For example, in case an up-regulation of power is required, when (average pitch angle PitchAvg-minimum pitch angle MinPitPos)<When the pitch angle position of the power droop switching rate is SwitchSpeedPitPos (hereinafter, may be abbreviated as a case where the pitch angle requires a buffer space), the adjustable power oneycleuppower of the variable pitch=the adjustable power of the first preset variable pitch of the first preset power preset 1s of the specific ratio of the first preset duration of the single step long period duration CloseLoopCycle of the first conversion deviation coefficient, that is,the first preset variable pitch may be capable of adjusting the power up to an adjustment capacity executionRateSlow preset for 1s, the first preset duration is a single-step long-period duration CloseLoopCycle, and the first conversion deviation coefficient may be 0.8, but is not limited thereto.

In addition, in the execution process of the power up-regulation, the judgment of the actual power meeting condition shown in fig. 8 may be set, that is, the actual power MeasP needs to meet the power up-regulation LimPwrMaxDmd smaller than the maximum power up-regulation LimPwrMaxDmd.

In addition, in the case that the difference between the average pitch angle and the minimum pitch angle is greater than or equal to the preset pitch angle position threshold, the second variable pitch up-adjustable power is equal to the product of the second preset variable pitch up-adjustable power, the second preset duration and the second conversion deviation coefficient for the unit time of the corresponding fan.

For example, in the event that power up-regulation is required, the difference between the average pitch angle and the minimum pitch angle is greater than or equal to a preset pitch angle position thresholdIn the case of values, this means that the pitch angle is not in the space where buffering is required (hereinafter, may be abbreviated as a case where the pitch angle is not in the buffering space), and at this time, the single-cycle execution rate is still fast execution RateFast. In particular, the method comprises the steps of,the second preset variable pitch can adjust the power to be the adjusting capacity execu of preset 1s, the first preset duration is a single-step long-period duration CloseLoopCycle, and the second conversion deviation coefficient can be 0.8, but is not limited to this.

By providing different execution rate controls, it is possible to achieve early deceleration before reaching a minimum margin reserved for pitch angle, to achieve reserving buffer space for power control, and thus to achieve power control with buffering.

According to an embodiment of the present disclosure, the step of calculating the single power up-adjustment amount of each fan may include: and calculating the product of the up-regulation weight coefficient of each fan and the up-regulation quantity of the power demand of the current control period to serve as the single-machine power up-regulation quantity of the corresponding fan.

In this example, the up-scaling weight coefficient for each fan is: the ratio of the variable pitch up-regulating power capacity of each fan to the sum of the variable pitch up-regulating power capacities of the fans corresponds to the first difference value of each fan and the rated power, and the first difference value is the product of the average pitch angle of all fans minus the minimum pitch angle of all fans and the power drop pitch angle speed coefficient. According to an embodiment of the present disclosure, the power-droop pitch angle multiple-speed coefficient represents a stall pitch angle multiple coefficient for amplifying a reserved deviation between a pitch angle of the wind turbine and a minimum pitch angle (a reserved space between the pitch angle of the wind turbine and the minimum pitch angle) for achieving wind turbine stall suppression.

Specifically, the single power up-regulation amount OneCommand of each fan=up-regulation weight coefficient Proportion of each fan×current control period power demand up-regulation amount cttdata. Further, the up-regulation weight coefficient Proportion of each fan=the variable pitch up-regulation capability OneCapaci of each fanthe sum G of the variable pitch power up-regulating capacity of each fan _{_TotalUPPitch} . Further, the pitch up-capability onecap of each fan= (average pitch angle PitchAvg-minimum pitch angle minpitpos×power-sag pitch angle multiplier stalllimit pitchcoeff) ×rated power Pn. Further, the sum of the variable pitch up-regulation power capability of each fanWherein beta is _i For average pitch angle, beta _min For minimum pitch angle, beta _min =minimum pitch angle minpitpos×power drop pitch angle multiplier stalllimit pitch coeff (meaning minimum pitch angle follows minimum space for reservation), and +.>Is rated power.

Through the pitch angle proportion algorithm based on small step adjustment, double-layer power drop control based on minimum pitch angle limiting space and buffer pitch angle control is realized, and adverse effects caused by power drop are effectively avoided or reduced.

Optionally, after the step of calculating the amount of stand-alone power up-adjustment of each fan, the power control method 100 may further include: for each fan, the following steps are executed: determining the minimum value of variable pitch up-adjustable power of a corresponding fan and a preset up-adjustable power threshold of the corresponding fan as a first result value; determining a first result value and a calculated minimum value of the single machine power up-regulating quantity of the corresponding fan as a second result value; and updating the single-machine power up-regulating quantity of the corresponding fan to a second result value.

As an example, the calculation is performed taking as an example the power that is executed in a single cycle at a preset rate, i.e. the adjustable power onejointing p=executionrateslow×closeloopcycle x 0.8 is preset in a single cycle for the case where the pitch angle requires a buffer space, or the adjustable power onejointing p=executionrateshot×closeloopcycle x 0.8 is preset in a single cycle for the case where the pitch angle is not in the buffer space.

After determining the value of oneciclep, a first result value limit oneciclep=min (OnecycleP, powerUpPitch), where Min represents a take-down operation and powerupptch represents an up-tunable power margin using theoretical power calculation. Second result value=min (OneCommand, limitOnecycleP calculated previously). Through the amplitude limiting calculation, the condition that the single-period preset adjustable power exceeds the adjustment capacity of the unit under certain working conditions can be effectively avoided.

Optionally, after determining the second result value, the power control method 100 may further include: and calculating the product of the second result value and the preset power drop coefficient of the corresponding fan aiming at each fan to obtain a third result value, and updating the single machine power up-regulating quantity of the corresponding fan to the third result value. Here, the preset power droop factor can enable a reduction in the rate of power control to further inhibit fan stall.

As an example, the third result value=power droop low coefficient stalllimit pcoeff×the second result value, wherein different power droop low coefficients stalllimit pcoeff can be flexibly adapted according to the constant value parameter.

By the calculation of the piezoelectric power (as shown in fig. 8) in which the amount of stand-alone power up-regulation is updated to the third result value, the rate of power control can be further reduced so that the rhythm of power control becomes slower, further contributing to avoiding or slowing down the power sag.

As an example, the fourth result value=the third result value+the preset Deviation correction value device, where the preset Deviation correction value device is: the difference value between the current actual power value of the corresponding fan and the initial power value P0 of the corresponding fan at the beginning of the current power grid frequency disturbance. Alternatively, the fourth result value may be used as the power adjustment amount indicated in the power up instruction finally issued to the blower.

By correcting the power up command to be issued by the deviation correction value, the effect of avoiding hunting in power control can be brought about.

The above specific flow of up-regulated power allocation may be illustrated with reference to fig. 8 and 9, fig. 8 illustrates a flow chart of a pitch angle scaling algorithm of up-regulated power allocation according to an exemplary embodiment of the present disclosure, and fig. 9 illustrates a power setting value flow chart of up-regulated power allocation according to an exemplary embodiment of the present disclosure, the details of which have been set forth in the foregoing description with respect to fig. 8 and 9, and are not repeated here.

According to an embodiment of the present disclosure, referring back to fig. 1, in step S105, a corresponding stand-alone power up-adjustment amount is issued to each of the fans to complete the power allocation of the current control period.

As an example, when the power up-regulation is actually performed by the blower, the primary frequency modulation execution rate issued by the blower may be slow SetValuePFRRateSlow or fast setvaluepfrrateflash (as shown in fig. 9) corresponding to the two cases described above.

In step S106, it is determined whether or not the power allocation corresponding to the total power actual shortage is completed, and if so, the power control is ended, otherwise, the flow returns to step S103.

On the other hand, according to an embodiment of the present disclosure, when the wind farm is in the process after the end of a primary frequency modulation and the total power actual absence is less than zero, another process flow 200 is performed, as particularly shown in fig. 2. Fig. 2 shows a flowchart of a method of power control of a wind farm according to another exemplary embodiment of the present disclosure.

Referring to fig. 2, in step S201, it is determined that the wind farm is in the process after the primary frequency modulation is completed and the total power actual shortage is less than zero. In this case, steps S202 to S204 are periodically performed until it is judged in step S205 that the power allocation corresponding to the total power actual shortage is completed.

Specifically, in step S202, the current control period power demand down-regulation amount is calculated based on the total power actual absence.

In step S203, the stand-alone power down-regulation amount of each fan is calculated based on the current control period power demand down-regulation amount and the variable pitch down-regulated power of each fan of the wind farm.

As an example, since the power sag is not very related to the power down, no successive approximation of the rate and pitch angle is used to power down, and the rate is calculated using a fast preset rate.

For example, in the case where power down is required, since the power dip is independent of the power down, the execution rate is calculated at a fast-varying preset value rate, i.e., the single-cycle execution rate is fast executionRateFast.

Specifically, the single power down-regulation amount OneCommand of each fan=the down-regulation weight coefficient Proportion of each fan×the current control period power demand down-regulation amount cttdata. Further, the down-regulation weight coefficient Proport of each fan=the sum of the pitch down-regulation capacity onecap of each fan/the pitch down-regulation power capacity of each fan G _{_TotalUPPitch} . That is, further, the pitch down-regulation capability onecap of each fan= (standby pitch angle StandbyPitPos-average pitch angle PitchAvg) ×rated power Pn.

Variable pitch power of each fan can be adjusted downwardsThe preset adjustment capability executionRatefast of 1s can be used for indicating the pitch power of a preset time period, the single-step long period CloseLoopCycle can be used for indicating the preset time period, and the conversion deviation coefficient can be set to be 0.8, but is not limited to the preset time period.

In addition, in the execution process of the power down-regulation, the judgment of the actual power meeting condition shown in fig. 10 may be set, that is, the actual power MeasP needs to meet the power down-regulation limpwrmndmd greater than the minimum required power down-regulation limpwrmndmd.

As an example, after the step of calculating the individual power down amounts for each fan, another process flow 200 may further include: for each fan, the following steps are executed: determining the minimum value of the variable pitch power capable of being adjusted downwards of the corresponding fan and the preset power threshold capable of being adjusted downwards of the corresponding fan, and taking the minimum value as a fifth result value; determining the minimum value of the fifth result value and the absolute value of the calculated single machine power down-regulating quantity of the corresponding fan as a sixth result value; and updating the single-machine power down-regulating quantity of the corresponding fan to a sixth result value.

As an example, the calculation is performed taking as an example the power that is executed in a single cycle at a preset rate, i.e., the single cycle preset adjustable power oneyclep=executionrateefast×closeloopcycle×0.8.

After determining the value of oneciclep, a fifth result value limit oneciclep=min (OnecycleP, ALLPowerDown), where Min represents a take-down operation and allpower down represents a downtunable power margin using theoretical power calculations. Sixth result value=min (fabs (previously calculated OneCommand), limit onecenter), where fabs represents taking absolute value. Through the amplitude limiting calculation, the condition that the single-period preset adjustable power exceeds the adjustment capacity of the unit under certain working conditions can be effectively avoided.

Optionally, after calculating the sixth result value, another process flow 200 may further include: calculating the sum of a sixth result value and a preset deviation correction value of the corresponding fan aiming at each fan to obtain a seventh result value, and updating the single power down-regulating quantity of the corresponding fan to the seventh result value, wherein the preset deviation correction value of each fan is as follows: the difference value between the current actual power value of the corresponding fan and the initial power value of the corresponding fan at the beginning of the current power grid frequency disturbance.

As an example, the seventh result value=sixth result value+preset Deviation correction value device, where the preset Deviation correction value device is: the difference value between the current actual power value of the corresponding fan and the initial power value P0 of the corresponding fan at the beginning of the current power grid frequency disturbance. Alternatively, the seventh result value may be used as the power adjustment amount indicated in the power down instruction finally issued to the blower.

By correcting the power down command to be issued by the deviation correction value, the effect of avoiding hunting in power control can be brought about.

The specific flow of the above down-regulated power allocation may be illustrated with reference to fig. 10 and 11, fig. 10 showing a flow chart of a pitch angle scaling algorithm of the down-regulated power allocation of a wind farm according to an exemplary embodiment of the present disclosure, and fig. 11 showing a power setpoint flow chart of the down-regulated power allocation according to an exemplary embodiment of the present disclosure. The details of fig. 10 and 11 are already described in the foregoing description, and are not repeated here.

Referring back to fig. 2, in step S204, a corresponding stand-alone power down-adjustment amount is issued to each fan to complete the power allocation of the current control period.

As an example, when the power down-regulation is actually performed by the blower, the primary frequency modulation execution rate issued by the blower may be further based on a slow SetValuePFRRateSlow or a fast setvaluepfrrateefast (as shown in fig. 11) corresponding to a case similar to the two cases described at the time of the power up-regulation.

In step S205, it is determined whether or not the power allocation corresponding to the total power actual shortage is completed, and if so, the power control is ended, otherwise, the flow returns to step S202.

Through the power down-regulation power distribution algorithm, the power grid frequency modulation requirement for realizing power down-regulation by requiring participation of a wind farm can be effectively met.

According to the power control method and device of the wind power plant, which are disclosed by the exemplary embodiment of the invention, the output power of the wind power plant is controlled by providing a cascade power control mode based on grid-connected point frequency closed loop, power closed loop and small step length adjustment, and the frequency modulation requirement of a power grid can be effectively met. By improving the algorithm related to the power closed loop and the small step adjustment, the double-layer power drop control based on the minimum pitch angle limiting space and the buffer pitch angle control is realized, and the adverse effect caused by power drop is effectively avoided or reduced. The gradual replacement of the rapid control of the primary frequency modulation and the slow control of the uniform power drop is also realized, so that the gradual power adjustment is realized. By small step control based on predetermined conditions, the real-time value of the pitch angle is determined more accurately, and by dynamically tracking the real-time value of the pitch angle, the nonlinear deviation between the free-generating pitch angle change and the power is reduced.

In addition, through the power distribution flow charts shown in fig. 8-11, the single-cycle execution action of the prefabricated unit and the isolation of the actual issuing main control parameters can be realized, so that oscillation is avoided.

Fig. 12 shows a block diagram of a power control device of a wind farm according to an exemplary embodiment of the present disclosure. According to the embodiment of the disclosure, the power control device can be used for primary frequency modulation anti-reverse modulation control of the fan.

Referring to fig. 12, a power control apparatus 1200 includes: an acquisition unit 1210, and a power allocation control unit 1220.

The acquisition unit 1210 is configured to: the actual absence of total power that needs to be regulated by the wind farm is obtained.

The power allocation control unit 1220 is configured to: when the wind farm is in the process after the primary frequency modulation is finished and the total power actual lack is greater than zero, the following steps are periodically executed until the power distribution corresponding to the total power actual lack is completed: calculating the power demand up-regulation quantity of the current control period based on the total power actual shortage; calculating the single power up-regulating quantity of each fan based on the current control period power demand up-regulating quantity and the variable pitch up-regulating power of each fan of the wind power plant; and transmitting corresponding single-machine power up-regulating quantity to each fan so as to finish the power distribution of the current control period.

As an example, the pitch up-tunable power may include a first pitch up-tunable power and a second pitch up-tunable power. For example, in the case that the difference between the average pitch angle of all fans and the minimum pitch angle of all fans is smaller than the preset pitch angle position threshold, the first variable pitch up-tunable power is equal to the product of the first preset variable pitch up-tunable power, the first preset duration and the first conversion deviation coefficient for the unit time of the corresponding fan, and in the case that the difference between the average pitch angle and the minimum pitch angle is greater than or equal to the preset pitch angle position threshold, the second variable pitch up-tunable power is equal to the product of the second preset variable pitch up-tunable power, the second preset duration and the second conversion deviation coefficient for the unit time of the corresponding fan.

As an example, the power allocation control unit 1220 may be configured to: and executing operation of calculating the single machine power up-regulating quantity of each fan in response to the following preset condition: the average pitch angle of all fans is greater than the product of the minimum pitch angle of all fans and the power drop pitch angle multiplier, wherein the minimum pitch angle is set to a predetermined value greater than zero when the minimum pitch angle is less than zero.

Optionally, the operation of the power distribution control unit calculating the single power up-regulation amount of each fan may include: and calculating the product of the up-regulation weight coefficient of each fan and the up-regulation quantity of the power demand of the current control period to serve as the single-machine power up-regulation quantity of the corresponding fan. In this example, the up-scaling weight coefficient for each fan is: the ratio of the variable pitch up-regulating power capacity of each fan to the sum of the variable pitch up-regulating power capacities of the fans corresponds to the first difference value of each fan and the rated power, and the first difference value is the product of the average pitch angle of all fans minus the minimum pitch angle of all fans and the power drop pitch angle speed coefficient.

As an example, the power allocation control unit 1220 may be further configured to: after the step of calculating the single power up-regulation amount of each fan, the following operations are performed for each fan: determining the minimum value of variable pitch up-adjustable power of a corresponding fan and a preset up-adjustable power threshold of the corresponding fan as a first result value; determining a first result value and a calculated minimum value of the single machine power up-regulating quantity of the corresponding fan as a second result value; and updating the single-machine power up-regulating quantity of the corresponding fan to a second result value.

As an example, the power allocation control unit 1220 may be further configured to: after the second result value is determined, calculating the product of the second result value and the preset power drop coefficient of the corresponding fan for each fan to obtain a third result value, and updating the single machine power up-regulating quantity of the corresponding fan to the third result value.

As an example, the power allocation control unit 1220 may be further configured to: after the operation of calculating the third result value, calculating the sum of the third result value and the preset deviation correction value of the corresponding fan for each fan to obtain a fourth result value, and updating the single power up-regulating quantity of the corresponding fan to the fourth result value, wherein the preset deviation correction value of each fan is as follows: the difference value between the current actual power value of the corresponding fan and the initial power value of the corresponding fan at the beginning of the current power grid frequency disturbance.

According to an example of the present disclosure, the power allocation control unit 1220 may be further configured to: when the wind farm is in the process after the primary frequency modulation is finished and the total power actual lack is less than zero, the following steps are periodically executed until the power distribution corresponding to the total power actual lack is completed: calculating the power demand down-regulation quantity of the current control period based on the total power actual shortage; calculating the single power down-regulating quantity of each fan based on the current control period power demand down-regulating quantity and the variable pitch down-regulated power of each fan of the wind power plant; and issuing corresponding single-machine power down-regulating quantity to each fan so as to finish the power distribution of the current control period.

As an example, the power allocation control unit 1220 may be further configured to: after the operation of calculating the single power down-regulation amount of each fan, the following operations are performed for each fan: determining the minimum value of the variable pitch power capable of being adjusted downwards of the corresponding fan and the preset power threshold capable of being adjusted downwards of the corresponding fan, and taking the minimum value as a fifth result value; determining the minimum value of the fifth result value and the absolute value of the calculated single machine power down-regulating quantity of the corresponding fan as a sixth result value; and updating the single-machine power down-regulating quantity of the corresponding fan to a sixth result value.

As an example, the power allocation control unit 1220 may be further configured to: after calculating the sixth result value, calculating the sum of the sixth result value and a preset deviation correction value of the corresponding fan for each fan to obtain a seventh result value, and updating the single machine power down-regulating quantity of the corresponding fan to the seventh result value, wherein the preset deviation correction value of each fan is as follows: the difference value between the current actual power value of the corresponding fan and the initial power value of the corresponding fan at the beginning of the current power grid frequency disturbance.

Alternatively, the power control device 1200 may be provided in a controller of the wind farm.

It should be appreciated that specific processes performed by the power control apparatus of the wind farm according to the exemplary embodiment of the present disclosure have been described in detail with reference to fig. 1 to 11, and will not be described again here.

It should be understood that the various units in the power control device of a wind farm according to exemplary embodiments of the present disclosure may be implemented as hardware components and/or software components. The individual units may be implemented, for example, using a Field Programmable Gate Array (FPGA) or an Application Specific Integrated Circuit (ASIC), depending on the processing performed by the individual units as defined.

Exemplary embodiments of the present disclosure provide a computer readable storage medium storing a computer program, which when executed by a processor, causes the processor to perform the power control method of a wind farm as described in the above exemplary embodiments. The computer readable storage medium is any data storage device that can store data which can be read by a computer system. Examples of the computer readable storage medium include: read-only memory, random access memory, compact disc read-only, magnetic tape, floppy disk, optical data storage device, and carrier waves (such as data transmission through the internet via wired or wireless transmission paths).

Fig. 13 shows a block diagram of a computer device according to an exemplary embodiment of the present disclosure.

The computer apparatus 1300 according to an exemplary embodiment of the present disclosure includes: a processor 1310 and a memory 1320. The memory 1320 stores a computer program which, when executed by the processor 1310, causes the processor 1310 to perform the power control method of a wind farm as described in the above exemplary embodiments. As an example, the computer device 1300 may be provided in a controller of a wind farm.

Although a few exemplary embodiments of the present disclosure have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the disclosure, the scope of which is defined in the claims and their equivalents.

Claims

1. The utility model provides a power control method of wind farm, characterized in that is used for the primary frequency modulation anti-reverse regulation control of fan, and the power control method includes:

acquiring the actual shortage of the total power required to be regulated by the wind farm;

when the wind farm is in the process after the primary frequency modulation is finished and the total power actual lack is greater than zero, periodically executing the following steps until the power distribution corresponding to the total power actual lack is completed:

Calculating the power demand up-regulation quantity of the current control period based on the total power actual shortage;

calculating the single power up-regulating quantity of each fan based on the current control period power demand up-regulating quantity and the variable pitch up-regulating power of each fan of the wind power plant;

and transmitting corresponding single-machine power up-regulating quantity to each fan so as to finish the power distribution of the current control period.

2. The method of claim 1, wherein the pitch up-regulated power comprises a first pitch up-regulated power and a second pitch up-regulated power,

wherein, under the condition that the difference between the average pitch angles of all fans and the minimum pitch angle of all fans is smaller than the preset pitch angle position threshold value, the first variable pitch up-adjustable power is equal to the product of the first preset variable pitch up-adjustable power, the first preset duration and the first conversion deviation coefficient of the unit time of the corresponding fans,

in case the difference between the average pitch angle and the minimum pitch angle is greater than or equal to the preset pitch angle position threshold, the second variable pitch up-tunable power is equal to the product of a second preset variable pitch up-tunable power per unit time of the corresponding fan, a second preset duration and a second conversion deviation coefficient,

The preset pitch angle position threshold value represents a value of a pitch angle position of a fan stall switching rate, so that the fan can be decelerated in advance before a pitch angle becomes a minimum pitch angle, and fan stall inhibition is achieved.

3. The power control method according to claim 1, wherein the step of calculating a stand-alone power up-regulation amount of each fan is performed in response to satisfaction of the following preset conditions:

the average pitch angle of all fans is larger than the product of the minimum pitch angle of all fans and the power drop pitch angle speed coefficient,

wherein when the minimum pitch angle is less than zero, the minimum pitch angle is set to a predetermined value greater than zero,

the power drop pitch angle multiple coefficient represents a stall pitch angle multiple coefficient for amplifying reserved deviation between a pitch angle and a minimum pitch angle of the fan, so that fan stall inhibition is realized.

4. The power control method of claim 3, wherein the step of calculating a stand-alone power up-regulation amount for each fan comprises:

calculating the product of the up-regulating weight coefficient of each fan and the up-regulating quantity of the power demand of the current control period as the up-regulating quantity of the single power of the corresponding fan,

The up-regulating weight coefficient of each fan is as follows: the ratio of the variable pitch up-regulating power capacity of each fan to the sum of the variable pitch up-regulating power capacities of the fans corresponds to the first difference value of each fan and the rated power, and the first difference value is the product of the average pitch angle of all fans minus the minimum pitch angle of all fans and the power drop pitch angle speed coefficient.

5. The power control method according to claim 1, wherein after the step of calculating the amount of stand-alone power up-regulation of each fan, the power control method further comprises:

for each fan, the following steps are executed:

determining the minimum value of variable pitch up-adjustable power of a corresponding fan and a preset up-adjustable power threshold of the corresponding fan as a first result value;

determining a first result value and a calculated minimum value of the single machine power up-regulating quantity of the corresponding fan as a second result value;

and updating the single power up-regulating quantity of the corresponding fan to the second result value.

6. The power control method of claim 5, wherein after determining the second result value, the power control method further comprises:

And calculating the product of the second result value and a preset power drop low coefficient of the corresponding fan aiming at each fan to obtain a third result value, and updating the single machine power up-regulating quantity of the corresponding fan to the third result value, wherein the preset power drop low coefficient can reduce the speed of the power control so as to further inhibit the stall of the fan.

7. The power control method of claim 6, wherein after the step of calculating a third result value, the power control method further comprises:

calculating the sum of the third result value and the preset deviation correction value of the corresponding fan aiming at each fan to obtain a fourth result value, updating the single power up-regulating quantity of the corresponding fan to the fourth result value,

the preset deviation correction value of each fan is as follows: the difference value between the current actual power value of the corresponding fan and the initial power value of the corresponding fan at the beginning of the current power grid frequency disturbance.

8. A power control device for a wind farm, the power control device being for primary frequency modulation anti-reverse modulation control of a wind turbine, the power control device comprising:

an acquisition unit configured to: acquiring the actual shortage of the total power required to be regulated by the wind farm;

A power allocation control unit configured to: when the wind farm is in the process after the primary frequency modulation is finished and the total power actual lack is greater than zero, periodically executing the following steps until the power distribution corresponding to the total power actual lack is completed:

9. A computer readable storage medium, characterized in that instructions in the computer readable storage medium, when executed by at least one processor, cause the at least one processor to perform the power control method of any of claims 1 to 7.

10. A computer device, comprising:

at least one processor;

at least one memory storing computer-executable instructions,

wherein the computer executable instructions, when executed by the at least one processor, cause the at least one processor to perform the power control method of any of claims 1 to 7.