CN116264405A - Active power control method, device and system of wind turbine generator - Google Patents

Abstract

The embodiment of the application discloses an active power control method, device and system of a wind turbine, wherein when active power output by a wind power generation field needs to be controlled to be increased, the active power adjustment quantity allocated to the target wind turbine is determined according to the difference between the current pitch angle of the target wind turbine in the wind power generation field and the minimum value of the pitch range of the target wind turbine; when the active power output by the wind power generation plant needs to be controlled to be reduced, determining the active power adjustment quantity distributed for the target wind power generation set according to the difference between the current pitch angle of the target wind power generation set in the wind power generation plant and the maximum value of the pitch range of the target wind power generation set. Active power adjustment quantity can be distributed more for wind turbines with large pitch angle margin, and active power adjustment quantity can be distributed less for wind turbines with small pitch angle margin, so that reasonable distribution of the active power adjustment quantity is realized, and the adjustment effect of the whole wind power plant is improved.

Description

Active power control method, device and system of wind turbine generator

Technical Field

The application relates to the technical field of wind power generation, in particular to an active power control method, device and system of a wind turbine generator.

Background

In practical application, the wind power generation field receives an automatic power generation control (Automatic Generation Control, AGC) active dispatching instruction issued by the power grid system, and correspondingly adjusts the active power of the wind power generation set, so that the active power output by the whole wind power generation field is close to the active power indicated by the AGC active dispatching instruction, namely, the deviation between the active power output by the wind power generation field and the active power indicated by the AGC active dispatching instruction is within the error range required by the power grid system. Moreover, with the recent stricter requirements regarding the incoming grid system, the control accuracy and speed of the active power output from the wind power plant are getting stricter.

In the prior art, after a wind power plant receives an AGC active scheduling instruction, the active power output by a wind turbine generator is generally adjusted according to the theoretical active power reported by the wind turbine generator in real time in the wind power plant and the current actual active power.

However, the effect obtained by the above adjustment method is not ideal, and by such adjustment method, it is often difficult to make the active power output by the whole wind farm close to the active power indicated by the AGC active scheduling command. The reason for this is that the calculation of the theoretical active power originates from the measured wind speed, which often fluctuates fast and is affected by environmental uncertainty, so that it is often difficult to ensure the accuracy of the measured wind speed, and accordingly, calculating the theoretical active power based on inaccurate wind speed measurements may also result in inaccuracy of the calculated theoretical active power; in addition, there is a certain uncertainty in the conversion process from wind speed to theoretical active power, which further affects the accuracy of the calculated theoretical active power.

Disclosure of Invention

The embodiment of the application provides an active power control method, device and system for a wind turbine, which can effectively adjust the active power output by the wind turbine, so that the active power output by the whole wind power plant is close to the full-plant planned active power indicated by a power grid system.

In view of this, the first aspect of the present application provides an active power control method for a wind turbine, where the method includes:

acquiring full-field plan active power transmitted by a power grid system;

determining a full-field active power adjustment amount according to the current internet active power of the wind power plant and the full-field planning active power; determining a power adjustment strategy for the wind power plant according to the full-field active power adjustment quantity;

when the determined power adjustment strategy is a power boost strategy, determining the corresponding adjustment power of each target wind turbine in the wind power generation plant according to the current pitch angle, the minimum variable pitch range, the rated power and the full-plant active power adjustment quantity of the target wind turbine; when the determined power adjustment strategy is a power reduction strategy, determining the corresponding adjustment power of each target wind turbine in the wind power generation plant according to the current pitch angle, the maximum value of the pitch range, the rated power and the full-field active power adjustment quantity of the target wind turbine;

And controlling each target wind turbine in the wind power plant to output active power according to the respective corresponding adjustment power of each target wind turbine in the wind power plant.

Optionally, when the determined power adjustment policy is a power boost policy, before determining, for each target wind turbine in the wind farm, the adjusted power corresponding to the target wind turbine according to the current pitch angle, the minimum pitch range, the rated power, and the full-farm active power adjustment amount of the target wind turbine, the method further includes:

determining the total theoretical active power according to the respective theoretical active power of each wind turbine generator in the current power generation state in the wind power generation field;

when the full-farm planned active power is larger than the total theoretical active power, controlling a candidate wind turbine generator set which is not in a power generation state in the wind power generation farm to start and enter a power generation state;

and taking each wind turbine generator set in a power generation state in the wind power generation field as the target wind turbine generator set.

Optionally, the determining, for each target wind turbine in the wind power plant, the adjustment power corresponding to the target wind turbine according to the current pitch angle, the minimum value of the pitch range, the rated power and the full-farm active power adjustment amount of the target wind turbine includes:

Determining a first reference power corresponding to each target wind turbine in the wind power generation field according to a difference value between the current pitch angle of the target wind turbine and the minimum value of the pitch range and the rated power of the target wind turbine;

determining total first reference power according to the first reference power corresponding to each target wind turbine generator in the wind power plant;

and aiming at each target wind turbine in the wind power generation field, determining the adjusting power corresponding to the target wind turbine according to the first reference power corresponding to the target wind turbine, the total first reference power and the full-field active power adjusting quantity.

Optionally, when the determined power adjustment policy is a power reduction policy, after determining, for each target wind turbine in the wind farm, the adjusted power corresponding to the target wind turbine according to the current pitch angle, the maximum value of the pitch range, the rated power, and the full-farm active power adjustment amount of the target wind turbine, the method further includes:

aiming at each target wind turbine in the wind power generation field, determining the predicted active power of the target wind turbine according to the active power set value of the target wind turbine in the last working period and the corresponding adjustment power of the target wind turbine;

Determining total predicted active power according to the predicted active power of each target wind turbine in the wind power plant;

and if the respective predicted active power of each target wind turbine in the wind power generation field reaches the corresponding output active power lower limit value, and the total predicted active power is larger than the full-field planning active power, controlling at least one target wind turbine in the wind power generation field to be closed.

Optionally, the determining, for each target wind turbine in the wind power plant, the adjustment power corresponding to the target wind turbine according to the current pitch angle, the maximum value of the pitch range, the rated power and the full-farm active power adjustment amount of the target wind turbine includes:

determining a second reference power corresponding to each target wind turbine in the wind power generation field according to the difference value between the maximum value of the pitch range of the target wind turbine and the current pitch angle and the rated power of the target wind turbine;

determining total second reference power according to the second reference power corresponding to each target wind turbine generator in the wind power plant;

And aiming at each target wind turbine in the wind power generation field, determining the adjusting power corresponding to the target wind turbine according to the second reference power corresponding to the target wind turbine, the total second reference power and the full-field active power adjusting quantity.

Optionally, the method further comprises:

judging whether the adjustment power corresponding to the target wind turbine is greater than the maximum power adjustment threshold value corresponding to the target wind turbine and smaller than the minimum power adjustment threshold value corresponding to the target wind turbine;

if the adjustment power corresponding to the target wind turbine is greater than the maximum power adjustment threshold corresponding to the target wind turbine, taking the adjustment power limit corresponding to the target wind turbine as the maximum power adjustment threshold corresponding to the target wind turbine;

and if the adjustment power corresponding to the target wind turbine is smaller than the minimum power adjustment threshold corresponding to the target wind turbine, taking the adjustment power limit value corresponding to the target wind turbine as the minimum power adjustment threshold corresponding to the target wind turbine.

Optionally, the controlling, according to the respective adjusted power of each target wind turbine in the wind power plant, the output active power of each target wind turbine in the wind power plant includes:

For each target wind turbine generator in the wind power generation field, determining an active power set value of the target wind turbine generator in a current working period according to the active power set value of the target wind turbine generator in a previous working period and the corresponding adjustment power of the target wind turbine generator;

and aiming at each target wind turbine in the wind power generation field, controlling the target wind turbine to output active power based on the active power set value of the target wind turbine in the current working period.

Optionally, the method further comprises:

for each target wind turbine generator in the wind power generation field, judging whether the set value of the active power of the target wind turbine generator in the current working period is larger than the theoretical active power of the target wind turbine generator and smaller than the minimum output active power of the target wind turbine generator;

if the set value of the active power of the target wind turbine in the current working period is larger than the theoretical active power of the target wind turbine, limiting the set value of the active power to be the theoretical active power of the target wind turbine;

and if the set value of the active power of the target wind turbine in the current working period is smaller than the minimum output active power of the target wind turbine, taking the limit value of the set value of the active power as the minimum output active power of the target wind turbine.

The second aspect of the present application provides an active power control device of a wind turbine generator, where the device includes:

the acquisition unit is used for acquiring full-field plan active power sent by the power grid system;

the strategy determining unit is used for determining the full-field active power adjustment amount according to the current internet active power of the wind power generation field and the full-field planning active power; determining a power adjustment strategy for the wind power plant according to the full-field active power adjustment quantity;

the adjustment amount determining unit is used for determining the adjustment power corresponding to each target wind turbine in the wind power generation plant according to the current pitch angle, the minimum value of the pitch range, the rated power and the full-field active power adjustment amount of the target wind turbine when the determined power adjustment strategy is a power increasing strategy; when the determined power adjustment strategy is a power reduction strategy, determining the corresponding adjustment power of each target wind turbine in the wind power generation plant according to the current pitch angle, the maximum value of the pitch range, the rated power and the full-field active power adjustment quantity of the target wind turbine;

And the control unit is used for controlling each target wind turbine generator in the wind power generation field to output active power according to the corresponding adjustment power of each target wind turbine generator in the wind power generation field.

A third aspect of the present application provides an active power control system of a wind turbine, the system comprising: a power grid system, an active power controller and a wind turbine generator system;

the power grid system is used for sending an active power adjustment instruction to the active power controller; the active power adjustment instructions include full field planned active power;

the active power controller is used for executing the active power control method of the wind turbine generator set in the first aspect;

and the wind turbine generator is used for responding to the control of the active power controller and outputting active power.

From the above technical solutions, the embodiments of the present application have the following advantages:

the embodiment of the application provides an active power control method of a wind turbine, which is used for adjusting the active power output by the wind turbine in a wind power generation field without taking the theoretical active power of the wind turbine as a reference basis, and creatively introducing the pitch angle of the wind turbine as the reference basis for adjusting the active power output by the wind turbine. When the active power output by a wind power generation plant needs to be controlled to be increased, determining an active power adjustment amount allocated to a target wind turbine generator according to the difference between the current pitch angle of the target wind power generation plant in the wind power generation plant and the minimum value of the pitch range of the target wind power generation plant; when the active power output by the wind power generation plant needs to be controlled to be reduced, determining the active power adjustment quantity distributed for the target wind power generation set according to the difference between the current pitch angle of the target wind power generation set in the wind power generation plant and the maximum value of the pitch range of the target wind power generation set. The active power adjustment quantity can be distributed more for the wind turbine with large pitch angle margin, and the active power adjustment quantity can be distributed less for the wind turbine with small pitch angle margin, so that reasonable distribution of the active power adjustment quantity can be realized, the adjustment effect of the whole wind power plant can be improved, and the active power output by the whole wind power plant is close to the full-plant planned active power indicated by the power grid system.

Drawings

Fig. 1 is a schematic diagram of an active power control system of a wind turbine according to an embodiment of the present application;

fig. 2 is a schematic flow chart of an active power control method of a wind turbine generator provided in an embodiment of the present application;

FIG. 3 is a schematic flow chart of another active power control method of a wind turbine generator according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of an active power control device of a wind turbine generator provided in an embodiment of the present application.

Detailed Description

In order to make the present application solution better understood by those skilled in the art, the following description will clearly and completely describe the technical solution in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

The terms "first," "second," "third," "fourth" and the like in the description and in the claims of this application and in the above-described figures, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In order to improve the adjustment effect on the active power output by the whole wind power plant, so that the active power output by the whole wind power plant is close to the full-field planned active power indicated by the power grid system, the embodiment of the application provides an active power control method of a wind turbine generator.

Specifically, in the method, after the full-field planning active power sent by the power grid system is obtained, the full-field active power adjustment amount can be determined according to the current internet active power of the wind power plant and the full-field planning active power, and the power adjustment strategy for the wind power plant is determined according to the full-field active power adjustment amount. When the determined power adjustment strategy is a power boosting strategy, aiming at each target wind turbine in the wind power generation plant, determining the corresponding adjustment power of the target wind turbine according to the current pitch angle, the minimum variable pitch range, the rated power and the full-field active power adjustment quantity of the target wind turbine; when the determined power adjustment strategy is a power reduction strategy, aiming at each target wind turbine in the wind power generation plant, determining the corresponding adjustment power of the target wind turbine according to the current pitch angle, the maximum value of the pitch range, the rated power and the full-field active power adjustment quantity of the target wind turbine. And further, controlling each target wind turbine in the wind power plant to output active power according to the respective corresponding adjustment power of each target wind turbine in the wind power plant.

The active power adjusting method does not take the theoretical active power of the wind turbine as a reference basis any more, adjusts the active power output by the wind turbine in the wind power generation field, and innovatively introduces the pitch angle of the wind turbine as the reference basis for adjusting the active power output by the wind turbine. When the active power output by a wind power generation plant needs to be controlled to be increased, determining an active power adjustment amount allocated to a target wind turbine generator according to the difference between the current pitch angle of the target wind power generation plant in the wind power generation plant and the minimum value of the pitch range of the target wind power generation plant; when the active power output by the wind power generation plant needs to be controlled to be reduced, determining the active power adjustment quantity distributed for the target wind power generation set according to the difference between the current pitch angle of the target wind power generation set in the wind power generation plant and the maximum value of the pitch range of the target wind power generation set. The active power adjustment quantity can be distributed more for the wind turbine with large pitch angle margin, and the active power adjustment quantity can be distributed less for the wind turbine with small pitch angle margin, so that reasonable distribution of the active power adjustment quantity can be realized, the adjustment effect of the whole wind power plant can be improved, and the active power output by the whole wind power plant is close to the full-plant planned active power indicated by the power grid system.

The active power control method of the wind turbine provided by the embodiment of the application can be particularly applied to the active power control system of the wind turbine provided by the embodiment of the application, and the active power control system of the wind turbine provided by the embodiment of the application is described below.

Referring to fig. 1, fig. 1 is a schematic diagram of an active power control system of a wind turbine generator according to an embodiment of the present application. As shown in fig. 1, the active power control system of the wind turbine generator includes a power grid system 101, an active power controller 102 and a wind turbine generator 103.

The power grid system 101 mainly refers to a power dispatching unit of a power grid, and is used for sending an active power adjustment instruction to the active power controller 102, where the active power adjustment instruction includes a full-field planning active power, and the full-field planning active power is an active power output target of the whole wind power plant, that is, the active power required to control the whole wind power plant to output is close to the full-field planning active power.

The active power controller 102 is configured to execute the active power control method of the wind turbine generator provided in the embodiments of the present application, so as to control the active power output by each wind turbine generator 103 to be close to the full-field planned active power issued by the power grid system 101. Specifically, the active power controller 102 is a control system located inside the wind farm, and may be matched with each wind turbine generator set in the wind farm, so as to implement adjustment of active power output by each wind turbine generator set.

As shown in fig. 1, the active power controller 102 may illustratively include an instruction receiving module 1021, a power distribution module 1022, and a communication module 1023. The instruction receiving module 1021 is configured to receive an active power adjustment instruction sent by the power grid system 101, and extract full-field planned active power therefrom. The power distribution module 1022 is specifically configured to execute the active power control method of the wind turbine generator provided in the embodiments of the present application, so as to correspondingly distribute and adjust power for each wind turbine generator set according to the current state of each wind turbine generator set in the wind power plant, and determine the active power that each wind turbine generator set should output. The communication module 102 is configured to send the active power that the power distribution module 1022 determines for each wind turbine generator set and should output to each wind turbine generator set 103 correspondingly, so that each wind turbine generator set 103 adjusts the active power output by itself accordingly.

The wind power generation set 103 includes a plurality of wind power generation sets 103, that is, a plurality of wind power generation sets 103 may be included in the active power control system, where the wind power generation sets 103 are configured to respond to the control of the active power controller 102 and output a corresponding active disclosure. That is, the wind turbine 103 may correspondingly adjust its working state according to the active power (i.e., the active power that the active power controller 102 determines should be output by the wind turbine 103) sent to it by the active power controller 102, so that the wind turbine itself outputs the active power.

The method for controlling the active power of the wind turbine generator provided by the embodiment of the application is described below through the method embodiment. Referring to fig. 2, fig. 2 is a flow chart of an active power control method of a wind turbine generator provided in an embodiment of the present application, as shown in fig. 2, the method includes:

step 201: and acquiring full-field planned active power transmitted by the power grid system.

In practical application, the active power controller can periodically adjust the active power output by the whole wind power plant, and when the active power controller adjusts the active power output by the whole wind power plant each time, the active power controller can correspondingly acquire the full-field planning active power G issued by the power grid system last time. The adjustment period of the active power controller may here be, for example, any duration between 1s and 60 s.

Step 202: determining a full-field active power adjustment amount according to the current internet active power of the wind power plant and the full-field planning active power; and determining a power adjustment strategy for the wind farm based on the full-farm active power adjustment.

After the active power controller obtains the full-field planning active power G, the difference value between the full-field planning active power G and the current internet active power P of the wind power generation field can be calculated to obtain the full-field active power deviation P _err The method comprises the steps of carrying out a first treatment on the surface of the It should be understood that the current net active power P of the wind farm here is the active power that is currently actually output by the wind farm as a whole. Furthermore, the full-field active power deviation P can be controlled by a PID (Proportion Integral Differential) controller (the control parameters of the PID controller can be read by a configuration file) _err And correcting to obtain the full-field active power adjustment quantity delta P.

When determining the power adjustment strategy for the wind power plant, whether to take the power up strategy or the power down strategy can be determined according to the relation between the full-field active power adjustment quantity delta P and the preset dead zone threshold value. Specifically, if the full-field active power adjustment amount Δp is within a preset dead zone, that is, if the full-field active power adjustment amount Δp is greater than the dead zone lower limit threshold and less than the dead zone upper limit threshold, it may be determined that there is no need to adjust the active power output by the wind farm in the present time. If the full-farm active power adjustment ΔP is less than the deadband lower threshold, then the power adjustment strategy to be adopted may be determined to be a power reduction strategy, i.e., an active power that requires a reduction in the wind farm full-farm output. If the full-farm active power adjustment ΔP is greater than the deadband upper threshold, then a power adjustment strategy to be adopted may be determined to be a power boost strategy, i.e., an increase in active power of the wind farm full-farm output is required.

The active power controller can also read the state data of each wind turbine in the wind power plant, and screen out the wind turbines which can be controlled in the wind power plant from the wind power plant according to the read state data of each wind turbine. For example, the active power controller may screen out wind turbines capable of generating electricity normally from the wind turbines according to the read status data of the wind turbines, where the wind turbines capable of generating electricity normally refer to wind turbines that do not have abnormal conditions such as shutdown, failure, uncontrolled condition, and the like. For each controllable wind turbine in the wind power plant, the active power controller can further read rated power P of the wind turbine _rated Current pitch angle beta _i Minimum value beta of pitch range _min Maximum value beta of pitch range _max And the power set value, the theoretical power of the fan and the fan state of the last working period.

Step 203: when the determined power adjustment strategy is a power boost strategy, determining the corresponding adjustment power of each target wind turbine in the wind power generation plant according to the current pitch angle, the minimum variable pitch range, the rated power and the full-plant active power adjustment quantity of the target wind turbine; when the determined power adjustment strategy is a power reduction strategy, aiming at each target wind turbine in the wind power generation field, determining the corresponding adjustment power of the target wind turbine according to the current pitch angle, the maximum value of the pitch range, the rated power and the full-field active power adjustment quantity of the target wind turbine.

When the determined power adjustment strategy is a power boost strategy, the active power controller can determine the adjustment power corresponding to each target wind turbine in the wind power plant according to the current pitch angle, the minimum variable pitch range, the rated power and the full-field active power adjustment amount of the target wind turbine. It should be understood that the target wind turbine herein refers to a wind turbine in a wind farm in a power generation state.

In order to ensure that after the active power output by each target wind turbine generator in the wind power plant is regulated by adopting a power boost strategy, the active power output by the whole wind power plant can be close to the full-field planning active power indicated by a power grid system, and before the respective corresponding regulated power of each target wind turbine generator is determined, an active power controller can determine the total theoretical active power according to the respective theoretical active power of each wind turbine generator currently in a power generation state in the wind power plant; when the full-farm planned active power is larger than the total theoretical active power, controlling a candidate wind turbine generator set which is not in a power generation state in the wind power generation farm to start and enter a power generation state; and taking each wind turbine generator set in a power generation state in the wind power generation field as the target wind turbine generator set.

Specifically, the active power controller may calculate a sum of respective theoretical active powers of each wind turbine generator set currently in a power generation state in the wind power plant as a total theoretical active power Σp _real ⁱ . If the full field planned active power G is greater than the total theoretical active power ΣP _real ⁱ The method includes that only the active power output by each wind turbine generator set currently in a power generation state in a wind power plant is adjusted, and the active power output by the whole wind power plant cannot reach full-plant planned active power G; at this time, it is necessary to increase wind turbines capable of generating electricity in the wind farm, that is, it is necessary to control starting of candidate wind turbines not in a generating state in the wind farm, and enter a generating state.

When the candidate wind turbine generator set in the power generation state is specifically selected, sequencing the candidate wind turbine generator sets according to the respective theoretical active power of each candidate wind turbine generator set which is not in the power generation state in the wind power generation field; for example, the candidate wind turbines are arranged in order of theoretical active power from high to low. Then, selecting a candidate wind turbine generator set with the maximum theoretical active power, and controlling the candidate wind turbine generator set to enter a power generation state; at the moment, the respective theoretical active power of each wind turbine generator set in the current power generation state in the wind power generation field can be recalculated Sum of (i) i.e. recalculate the total theoretical active power Σp _real ⁱ And judges the total theoretical active power Sigma P _real ⁱ Whether greater than full field planned active power G; if so, each wind turbine generator in the current power generation state in the wind power generation field can be regarded as a target wind turbine generator, and the active power output by each target wind turbine generator is correspondingly adjusted; if not, the candidate wind turbine generator set with the maximum theoretical active power is required to be continuously selected from the rest candidate wind turbine generator sets, the candidate wind turbine generator set is controlled to enter a power generation state, and the total theoretical active power sigma P is recalculated and calculated _real ⁱ The method loops until the calculated total theoretical active power Sigma P is calculated _real ⁱ Greater than full field planned active power G.

When the determined power adjustment strategy is a power boost strategy, the active power controller can specifically determine the adjustment power corresponding to each target wind turbine by the following manner: determining a first reference power corresponding to each target wind turbine in a wind power plant according to a difference value between the current pitch angle of the target wind turbine and the minimum value of a pitch range and the rated power of the target wind turbine; determining total first reference power according to the first reference power corresponding to each target wind turbine generator in the wind power plant; furthermore, for each target wind turbine in the wind power generation plant, the corresponding adjustment power of the target wind turbine is determined according to the corresponding first reference power, the total first reference power and the full-field active power adjustment quantity of the target wind turbine.

When the determined power adjustment strategy is a power boost strategy, a formula for specifically calculating the adjustment power corresponding to each target wind turbine is shown as formula (1):

the delta Pi is the adjustment power corresponding to the ith target wind turbine generator set in the wind power plant. βi is the current pitch angle of the ith target wind turbine generator, and βmin isThe variable pitch range of the ith target wind turbine generator system is the minimum value,

the rated power of the ith target wind turbine generator is set; />

And the first reference power corresponding to the ith target wind turbine generator system is obtained. N is the total number of target wind turbines in the wind power plant, < >>

For the total first reference power, Δp is the full field active power adjustment.

When the determined power adjustment strategy is a power reduction strategy, the active power controller can determine the corresponding adjustment power of each target wind turbine in the wind power plant according to the current pitch angle, the maximum value of the variable pitch range, the rated power and the full-plant active power adjustment quantity of the target wind turbine. It should be understood that the target wind turbine herein still refers to a wind turbine in a wind farm in a power generation state.

When the determined power adjustment strategy is a power reduction strategy, the active power controller can specifically determine the adjustment power corresponding to each target wind turbine by the following manner: determining a second reference power corresponding to each target wind turbine in the wind power generation field according to the difference value between the maximum value of the pitch range of the target wind turbine and the current pitch angle and the rated power of the target wind turbine; determining total second reference power according to the second reference power corresponding to each target wind turbine generator in the wind power plant; furthermore, for each target wind turbine in the wind power generation plant, determining the adjustment power corresponding to the target wind turbine according to the second reference power, the total second reference power and the full-field active power adjustment quantity corresponding to the target wind turbine.

When the determined power adjustment strategy is a power reduction strategy, a formula for specifically calculating the adjustment power corresponding to each target wind turbine is shown as formula (2):

the delta Pi is the adjustment power corresponding to the ith target wind turbine generator set in the wind power plant. βi is the current pitch angle of the ith target wind turbine generator, βmax is the maximum value of the pitch range of the ith target wind turbine generator,

the rated power of the ith target wind turbine generator is set; />

And the second reference power corresponding to the ith target wind turbine generator system is obtained. N is the total number of target wind turbines in the wind power plant, < >>

For the total second reference power, Δp is the full field active power adjustment.

In order to ensure that after the active power output by each target wind turbine in the wind power plant is regulated by adopting a power reduction strategy, the active power output by the whole wind power plant can be close to the full-field planning active power indicated by a power grid system, and after the active power controller determines the respective corresponding regulated power of each target wind turbine in the wind power plant which is currently in a power generation state, the predicted active power of each target wind turbine in the wind power plant can be determined according to the active power set value of the target wind turbine in the previous working period and the corresponding regulated power of the target wind turbine; then, determining total predicted active power according to the predicted active power of each target wind turbine in the wind power plant; and if the respective predicted active power of each target wind turbine in the wind power generation field reaches the corresponding lower limit value of the output active power, and the total predicted active power is larger than the full-field planned active power, controlling at least one target wind turbine in the wind power generation field to be turned off.

Specifically, after the active power controller determines the respective corresponding adjustment power of each target wind turbine in the wind power plant, the active power set value P of each target wind turbine in the last working period of the target wind turbine can be calculated for each target wind turbine _i ^n-1 The sum value of the adjustment power delta Pi corresponding to the target wind turbine generator set is used for obtaining the predicted active power P of the target wind turbine generator set in the working period _i ⁿ . And further, calculating the total predicted active power according to the predicted active power of each target wind turbine generator in the working period. The respective predicted active power P of each target wind turbine generator _i ⁿ When the total predicted active power is still higher than the full-farm-planning active power G, the total predicted active power is not easy to reach the full-farm-planning active power G even if the output power of each target wind turbine in the current power generation state is adjusted to be the minimum value, and at this time, at least one target wind turbine in the wind power farm needs to be controlled to be turned off accordingly.

When the closed target wind turbine generator is specifically selected, one target wind turbine generator can be randomly selected to be closed, after the target wind turbine generator is closed, the total predicted active power is recalculated according to the respective predicted active power of each target wind turbine generator still in a power generation state at present, and whether the total predicted active power is smaller than the full-field planned active power G is judged; if yes, each target wind turbine generator in the current power generation state can be determined to be controlled, namely, each target wind turbine generator is controlled to correspondingly adjust the output power of each target wind turbine generator; if not, the target wind turbine generator is required to be continuously selected to be closed, and after the selected target wind turbine generator is closed, the total predicted active power is recalculated, and whether the total predicted active power is smaller than the full-field planned active power G is judged until the calculated total predicted active power is smaller than the full-field planned active power G.

It should be noted that, in order to avoid that the adjustment amount of the active power output by the target wind turbine generator does not conform to the adjustment specification, the working performance of the target wind turbine generator is affected, the active power controller may also perform limit processing on the adjustment power corresponding to the target wind turbine generator. After determining the adjustment power corresponding to the target wind turbine, judging whether the adjustment power corresponding to the target wind turbine is greater than a maximum power adjustment threshold value corresponding to the target wind turbine and smaller than a minimum power adjustment threshold value corresponding to the target wind turbine; if the adjustment power corresponding to the target wind turbine is greater than the maximum power adjustment threshold corresponding to the target wind turbine, the adjustment power limit corresponding to the target wind turbine can be used as the maximum power adjustment threshold corresponding to the target wind turbine; and if the adjustment power corresponding to the target wind turbine is smaller than the minimum power adjustment threshold corresponding to the target wind turbine, the adjustment power limit corresponding to the target wind turbine can be used as the minimum power adjustment threshold corresponding to the target wind turbine.

Step 204: and controlling each target wind turbine in the wind power plant to output active power according to the respective corresponding adjustment power of each target wind turbine in the wind power plant.

After the active power controller determines the respective corresponding adjustment power of each target wind turbine in the wind power generation field, each target wind turbine in the wind power generation field can be aimed at according to the active power set value P of the target wind turbine in the previous working period _i ^n-1 The power adjustment delta Pi corresponding to the target wind turbine is used for determining an active power set value of the target wind turbine in the current working period; furthermore, aiming at each target wind turbine in the wind power generation plant, the target wind turbine is controlled to output active power based on the active power set value of the target wind turbine in the current working period.

It should be noted that, in order to avoid that the determined active power set value of the target wind turbine generator is unreliable, it is difficult to control the target wind turbine generator to reach the corresponding active power set value, the active power controller may further perform limit processing on the active power set value after determining the active power set value of the target wind turbine generator in the current working period. Specifically, for each target wind turbine in a wind power plant, judging whether the set value of the active power of the target wind turbine in the current working period is larger than the theoretical active power of the target wind turbine and smaller than the minimum output active power of the target wind turbine; if the set value of the active power of the target wind turbine in the current working period is larger than the theoretical active power of the target wind turbine, taking the set value limit value of the active power as the theoretical active power of the target wind turbine; and if the set value of the active power of the target wind turbine in the current working period is smaller than the minimum output active power of the target wind turbine, taking the set value limit value of the active power as the minimum output active power of the target wind turbine.

Fig. 3 shows a flowchart for completely implementing the active power control method described above, and the flow for completely implementing the active power control method of the wind turbine generator provided in the embodiment of the present application may refer to the flow shown in fig. 3. The steps in the flow shown in fig. 3 have been described in detail above.

The active power adjusting method does not take the theoretical active power of the wind turbine as a reference basis any more, adjusts the active power output by the wind turbine in the wind power generation field, and innovatively introduces the pitch angle of the wind turbine as the reference basis for adjusting the active power output by the wind turbine. When the active power output by a wind power generation plant needs to be controlled to be increased, determining an active power adjustment amount allocated to a target wind turbine generator according to the difference between the current pitch angle of the target wind power generation plant in the wind power generation plant and the minimum value of the pitch range of the target wind power generation plant; when the active power output by the wind power generation plant needs to be controlled to be reduced, determining the active power adjustment quantity distributed for the target wind power generation set according to the difference between the current pitch angle of the target wind power generation set in the wind power generation plant and the maximum value of the pitch range of the target wind power generation set. The active power adjustment quantity can be distributed more for the wind turbine with large pitch angle margin, and the active power adjustment quantity can be distributed less for the wind turbine with small pitch angle margin, so that reasonable distribution of the active power adjustment quantity can be realized, the adjustment effect of the whole wind power plant can be improved, and the active power output by the whole wind power plant is close to the full-plant planned active power indicated by the power grid system.

The embodiment of the application also provides an active power control device of the wind turbine, referring to fig. 4, and fig. 4 is a schematic structural diagram of the active power control device of the wind turbine. As shown in fig. 4, the apparatus includes:

an obtaining unit 401, configured to obtain full-field planned active power sent by a power grid system;

a policy determining unit 402, configured to determine a full-farm active power adjustment amount according to a current internet active power of a wind farm and the full-farm planned active power; determining a power adjustment strategy for the wind power plant according to the full-field active power adjustment quantity;

an adjustment amount determining unit 403, configured to determine, for each target wind turbine in the wind farm, an adjustment power corresponding to the target wind turbine according to a current pitch angle, a minimum pitch range, a rated power, and the full-farm active power adjustment amount of the target wind turbine when the determined power adjustment policy is a power boost policy; when the determined power adjustment strategy is a power reduction strategy, determining the corresponding adjustment power of each target wind turbine in the wind power generation plant according to the current pitch angle, the maximum value of the pitch range, the rated power and the full-field active power adjustment quantity of the target wind turbine;

And the control unit 404 is configured to control each target wind turbine generator set in the wind power plant to output active power according to the respective adjusted power of each target wind turbine generator set in the wind power plant.

Optionally, the adjustment amount determining unit 403 is further configured to:

when the determined power adjustment strategy is a power boost strategy, determining the total theoretical active power according to the respective theoretical active power of each wind turbine in the wind power generation field currently in a power generation state before determining the corresponding adjustment power of the target wind turbine according to the current pitch angle, the minimum variable pitch range, the rated power and the full-field active power adjustment quantity of each target wind turbine in the wind power generation field;

when the full-farm planned active power is larger than the total theoretical active power, controlling a candidate wind turbine generator set which is not in a power generation state in the wind power generation farm to start and enter a power generation state;

and taking each wind turbine generator set in a power generation state in the wind power generation field as the target wind turbine generator set.

Optionally, the adjustment amount determining unit 403 is specifically configured to:

when the determined power adjustment strategy is a power boost strategy, determining a first reference power corresponding to each target wind turbine in the wind power plant according to a difference value between the current pitch angle of the target wind turbine and the minimum value of the pitch range and the rated power of the target wind turbine;

Determining total first reference power according to the first reference power corresponding to each target wind turbine generator in the wind power plant;

and aiming at each target wind turbine in the wind power generation field, determining the adjusting power corresponding to the target wind turbine according to the first reference power corresponding to the target wind turbine, the total first reference power and the full-field active power adjusting quantity.

Optionally, the adjustment amount determining unit 403 is further configured to:

when the determined power adjustment strategy is a power reduction strategy, determining the corresponding adjustment power of each target wind turbine in the wind power plant according to the current pitch angle, the maximum value of the variable pitch range, the rated power and the full-farm active power adjustment quantity of each target wind turbine in the wind power plant, and then determining the predicted active power of each target wind turbine in the wind power plant according to the active power set value of the target wind turbine in the last working period and the corresponding adjustment power of the target wind turbine;

determining total predicted active power according to the predicted active power of each target wind turbine in the wind power plant;

And if the respective predicted active power of each target wind turbine in the wind power generation field reaches the corresponding output active power lower limit value, and the total predicted active power is larger than the full-field planning active power, controlling at least one target wind turbine in the wind power generation field to be closed.

Optionally, the adjustment amount determining unit 403 is specifically configured to:

when the determined power adjustment strategy is a power reduction strategy, determining a second reference power corresponding to each target wind turbine in the wind power plant according to a difference value between the maximum value of the pitch range of the target wind turbine and the current pitch angle and the rated power of the target wind turbine;

determining total second reference power according to the second reference power corresponding to each target wind turbine generator in the wind power plant;

and aiming at each target wind turbine in the wind power generation field, determining the adjusting power corresponding to the target wind turbine according to the second reference power corresponding to the target wind turbine, the total second reference power and the full-field active power adjusting quantity.

Optionally, the adjustment amount determining unit 403 is further configured to:

judging whether the adjustment power corresponding to the target wind turbine is greater than the maximum power adjustment threshold value corresponding to the target wind turbine and smaller than the minimum power adjustment threshold value corresponding to the target wind turbine;

if the adjustment power corresponding to the target wind turbine is greater than the maximum power adjustment threshold corresponding to the target wind turbine, taking the adjustment power limit corresponding to the target wind turbine as the maximum power adjustment threshold corresponding to the target wind turbine;

and if the adjustment power corresponding to the target wind turbine is smaller than the minimum power adjustment threshold corresponding to the target wind turbine, taking the adjustment power limit value corresponding to the target wind turbine as the minimum power adjustment threshold corresponding to the target wind turbine.

Optionally, the control unit 404 is specifically configured to:

for each target wind turbine generator in the wind power generation field, determining an active power set value of the target wind turbine generator in a current working period according to the active power set value of the target wind turbine generator in a previous working period and the corresponding adjustment power of the target wind turbine generator;

And aiming at each target wind turbine in the wind power generation field, controlling the target wind turbine to output active power based on the active power set value of the target wind turbine in the current working period.

Optionally, the control unit 404 is further configured to:

for each target wind turbine generator in the wind power generation field, judging whether the set value of the active power of the target wind turbine generator in the current working period is larger than the theoretical active power of the target wind turbine generator and smaller than the minimum output active power of the target wind turbine generator;

if the set value of the active power of the target wind turbine in the current working period is larger than the theoretical active power of the target wind turbine, limiting the set value of the active power to be the theoretical active power of the target wind turbine;

and if the set value of the active power of the target wind turbine in the current working period is smaller than the minimum output active power of the target wind turbine, taking the limit value of the set value of the active power as the minimum output active power of the target wind turbine.

The active power adjusting device does not take the theoretical active power of the wind turbine as a reference basis any more, adjusts the active power output by the wind turbine in the wind power generation field, and innovatively introduces the pitch angle of the wind turbine as a reference basis for adjusting the active power output by the wind turbine. When the active power output by a wind power generation plant needs to be controlled to be increased, determining an active power adjustment amount allocated to a target wind turbine generator according to the difference between the current pitch angle of the target wind power generation plant in the wind power generation plant and the minimum value of the pitch range of the target wind power generation plant; when the active power output by the wind power generation plant needs to be controlled to be reduced, determining the active power adjustment quantity distributed for the target wind power generation set according to the difference between the current pitch angle of the target wind power generation set in the wind power generation plant and the maximum value of the pitch range of the target wind power generation set. The active power adjustment quantity can be distributed more for the wind turbine with large pitch angle margin, and the active power adjustment quantity can be distributed less for the wind turbine with small pitch angle margin, so that reasonable distribution of the active power adjustment quantity can be realized, the adjustment effect of the whole wind power plant can be improved, and the active power output by the whole wind power plant is close to the full-plant planned active power indicated by the power grid system.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.

In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: u disk, mobile hard disk, read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), magnetic disk or optical disk, etc. various media for storing computer program.

It should be understood that in this application, "at least one" means one or more, and "a plurality" means two or more. "and/or" for describing the association relationship of the association object, the representation may have three relationships, for example, "a and/or B" may represent: only a, only B and both a and B are present, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b or c may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.

The above embodiments are merely for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.

Claims (10)

1. An active power control method of a wind turbine generator, comprising the steps of:

acquiring full-field plan active power transmitted by a power grid system;

determining a full-field active power adjustment amount according to the current internet active power of the wind power plant and the full-field planning active power; determining a power adjustment strategy for the wind power plant according to the full-field active power adjustment quantity;

when the determined power adjustment strategy is a power boost strategy, determining the corresponding adjustment power of each target wind turbine in the wind power generation plant according to the current pitch angle, the minimum variable pitch range, the rated power and the full-plant active power adjustment quantity of the target wind turbine; when the determined power adjustment strategy is a power reduction strategy, determining the corresponding adjustment power of each target wind turbine in the wind power generation plant according to the current pitch angle, the maximum value of the pitch range, the rated power and the full-field active power adjustment quantity of the target wind turbine;

and controlling each target wind turbine in the wind power plant to output active power according to the respective corresponding adjustment power of each target wind turbine in the wind power plant.

2. The method according to claim 1, wherein when the determined power adjustment strategy is a power boost strategy, before the determining, for each target wind turbine in the wind farm, the corresponding adjustment power for the target wind turbine according to the current pitch angle, the minimum pitch range, the rated power, and the full farm active power adjustment amount for the target wind turbine, the method further comprises:

determining the total theoretical active power according to the respective theoretical active power of each wind turbine generator in the current power generation state in the wind power generation field;

when the full-farm planned active power is larger than the total theoretical active power, controlling a candidate wind turbine generator set which is not in a power generation state in the wind power generation farm to start and enter a power generation state;

and taking each wind turbine generator set in a power generation state in the wind power generation field as the target wind turbine generator set.

3. The method according to claim 1 or 2, wherein for each target wind turbine in the wind farm, determining the corresponding adjustment power of the target wind turbine according to the current pitch angle, the minimum value of the pitch range, the rated power and the full-farm active power adjustment amount of the target wind turbine comprises:

Determining a first reference power corresponding to each target wind turbine in the wind power generation field according to a difference value between the current pitch angle of the target wind turbine and the minimum value of the pitch range and the rated power of the target wind turbine;

determining total first reference power according to the first reference power corresponding to each target wind turbine generator in the wind power plant;

and aiming at each target wind turbine in the wind power generation field, determining the adjusting power corresponding to the target wind turbine according to the first reference power corresponding to the target wind turbine, the total first reference power and the full-field active power adjusting quantity.

4. The method according to claim 1, wherein when the determined power adjustment strategy is a power down strategy, after determining the corresponding adjustment power for each target wind turbine in the wind farm according to the current pitch angle, pitch range maximum, rated power and the full farm active power adjustment amount for the target wind turbine, the method further comprises:

aiming at each target wind turbine in the wind power generation field, determining the predicted active power of the target wind turbine according to the active power set value of the target wind turbine in the last working period and the corresponding adjustment power of the target wind turbine;

Determining total predicted active power according to the predicted active power of each target wind turbine in the wind power plant;

and if the respective predicted active power of each target wind turbine in the wind power generation field reaches the corresponding output active power lower limit value, and the total predicted active power is larger than the full-field planning active power, controlling at least one target wind turbine in the wind power generation field to be closed.

5. The method according to claim 1 or 4, wherein for each target wind turbine in the wind farm, determining the corresponding adjustment power of the target wind turbine according to the current pitch angle, the maximum value of the pitch range, the rated power and the full farm active power adjustment amount of the target wind turbine comprises:

determining a second reference power corresponding to each target wind turbine in the wind power generation field according to the difference value between the maximum value of the pitch range of the target wind turbine and the current pitch angle and the rated power of the target wind turbine;

determining total second reference power according to the second reference power corresponding to each target wind turbine generator in the wind power plant;

And aiming at each target wind turbine in the wind power generation field, determining the adjusting power corresponding to the target wind turbine according to the second reference power corresponding to the target wind turbine, the total second reference power and the full-field active power adjusting quantity.

6. The method according to claim 1, wherein the method further comprises:

judging whether the adjustment power corresponding to the target wind turbine is greater than the maximum power adjustment threshold value corresponding to the target wind turbine and smaller than the minimum power adjustment threshold value corresponding to the target wind turbine;

if the adjustment power corresponding to the target wind turbine is greater than the maximum power adjustment threshold corresponding to the target wind turbine, taking the adjustment power limit corresponding to the target wind turbine as the maximum power adjustment threshold corresponding to the target wind turbine;

and if the adjustment power corresponding to the target wind turbine is smaller than the minimum power adjustment threshold corresponding to the target wind turbine, taking the adjustment power limit value corresponding to the target wind turbine as the minimum power adjustment threshold corresponding to the target wind turbine.

7. The method according to claim 1, wherein controlling the output active power of each of the target wind turbines in the wind farm according to the respective adjusted power of each of the target wind turbines in the wind farm comprises:

For each target wind turbine generator in the wind power generation field, determining an active power set value of the target wind turbine generator in a current working period according to the active power set value of the target wind turbine generator in a previous working period and the corresponding adjustment power of the target wind turbine generator;

and aiming at each target wind turbine in the wind power generation field, controlling the target wind turbine to output active power based on the active power set value of the target wind turbine in the current working period.

8. The method of claim 7, wherein the method further comprises:

for each target wind turbine generator in the wind power generation field, judging whether the set value of the active power of the target wind turbine generator in the current working period is larger than the theoretical active power of the target wind turbine generator and smaller than the minimum output active power of the target wind turbine generator;

if the set value of the active power of the target wind turbine in the current working period is larger than the theoretical active power of the target wind turbine, limiting the set value of the active power to be the theoretical active power of the target wind turbine;

And if the set value of the active power of the target wind turbine in the current working period is smaller than the minimum output active power of the target wind turbine, taking the limit value of the set value of the active power as the minimum output active power of the target wind turbine.

9. An active power control device for a wind turbine, the device comprising:

the acquisition unit is used for acquiring full-field plan active power sent by the power grid system;

the strategy determining unit is used for determining the full-field active power adjustment amount according to the current internet active power of the wind power generation field and the full-field planning active power; determining a power adjustment strategy for the wind power plant according to the full-field active power adjustment quantity;

the adjustment amount determining unit is used for determining the adjustment power corresponding to each target wind turbine in the wind power generation plant according to the current pitch angle, the minimum value of the pitch range, the rated power and the full-field active power adjustment amount of the target wind turbine when the determined power adjustment strategy is a power increasing strategy; when the determined power adjustment strategy is a power reduction strategy, determining the corresponding adjustment power of each target wind turbine in the wind power generation plant according to the current pitch angle, the maximum value of the pitch range, the rated power and the full-field active power adjustment quantity of the target wind turbine;

And the control unit is used for controlling each target wind turbine generator in the wind power generation field to output active power according to the corresponding adjustment power of each target wind turbine generator in the wind power generation field.

10. An active power control system for a wind turbine, the system comprising: a power grid system, an active power controller and a wind turbine generator system;

the power grid system is used for sending an active power adjustment instruction to the active power controller; the active power adjustment instructions include full field planned active power;

the active power controller is configured to perform the active power control method of the wind turbine according to any one of claims 1 to 8;

and the wind turbine generator is used for responding to the control of the active power controller and outputting active power.

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