阅读说明：本技术 风力发电机组功率控制方法、装置和存储介质 (Wind generating set power control method and device and storage medium ) 是由 刘忠朋 肖硕文 于 2019-02-15 设计创作，主要内容包括：本发明公开一种风力发电机组功率控制方法、装置和存储介质,该方法包括：获得风力发电机组的功率调度信息；根据功率调度信息,以及风力发电机组的功率调节器在上一周期的输入误差,和功率调节器在当前周期与在上一周期的输入误差的差值,限定功率调节器在当前周期的输出值,使风力发电机组在功率调度期间稳定运行；其中,输入误差为风力发电机组的功率表征参量的测量值和对应的设定值之间的差值。采用本发明实施例中的技术方案,能够在保证风力发电机组稳定运行的前提下,使风力发电机组瞬间完成功率过渡,从而极大地缩短风力发电机组功率调度的时间。(The invention discloses a power control method, a device and a storage medium for a wind generating set, wherein the method comprises the following steps: obtaining power scheduling information of the wind generating set; according to the power scheduling information, the input error of a power regulator of the wind generating set in the previous period and the difference value of the input error of the power regulator in the current period and the input error of the power regulator in the previous period, the output value of the power regulator in the current period is limited, and the wind generating set can stably run in the power scheduling period; the input error is the difference between the measured value of the power characterization parameter of the wind generating set and the corresponding set value. By adopting the technical scheme in the embodiment of the invention, the wind generating set can instantly complete power transition on the premise of ensuring the stable operation of the wind generating set, thereby greatly shortening the time of power scheduling of the wind generating set.)

1. A power control method for a wind generating set is characterized by comprising the following steps:

obtaining power scheduling information of the wind generating set;

according to the power scheduling information, the input error of a power regulator of the wind generating set in the last period and the difference value of the input error of the power regulator in the current period and the input error of the power regulator in the last period, limiting the output value of the power regulator in the current period, and enabling the wind generating set to stably operate in the power scheduling period;

and the input error is the difference between the measured value of the power characterization parameter of the wind generating set and the corresponding set value.

2. The method of claim 1, wherein the defining an output value of the power regulator in the current cycle according to the power scheduling information, and an input error of the power regulator of the wind turbine generator system in a previous cycle, and a difference between the input error of the power regulator in the current cycle and the input error in the previous cycle comprises:

if the power scheduling information is fast power down indication information, and the product of the input error of the power regulator in the previous period and the difference value of the input error of the power regulator in the current period and the input error of the power regulator in the previous period is less than 0, limiting the output value of the power regulator in the current period to be less than or equal to the output value of the power regulator in the previous period; and/or the presence of a gas in the gas,

and if the power scheduling information is the rapid power-up indication information, and the product of the input error of the power regulator in the previous period and the difference value of the input error of the power regulator in the current period and the input error of the power regulator in the previous period is less than 0, limiting the output value of the power regulator in the current period to be greater than or equal to the output value of the power regulator in the previous period.

3. The method of claim 1, wherein the obtaining power scheduling information for the wind turbine generator set comprises:

calculating the difference value of the set values of the power characterization parameters of the current period and the previous period;

if the difference value of the set values of the power characterization parameters of the current period and the previous period is smaller than a first preset threshold value, determining the power scheduling information as rapid power reduction indication information;

and if the difference value of the set values of the power characterization parameters of the current period and the previous period is greater than a second preset threshold value, determining that the power scheduling information is rapid power-up indication information.

4. A method according to any of claims 1-3, wherein the power characterizing quantity comprises a wind park rotational speed or power.

5. A method according to any of claims 1-3, wherein the power adjuster is a pitch angle adjuster or a torque adjuster.

6. A wind generating set power control device, characterized by comprising:

the scheduling information obtaining module is used for obtaining power scheduling information of the wind generating set;

the limiting processing module is used for limiting the output value of the power regulator in the current period according to the power scheduling information, the input error of the power regulator of the wind generating set in the previous period and the difference value of the input error of the power regulator in the current period and the previous period, so that the wind generating set stably operates in the power scheduling period;

and the input error is the difference between the measured value of the power characterization parameter of the wind generating set and the corresponding set value.

7. The apparatus of claim 1, wherein the definition processing module comprises: a fast power-down limit processing unit and/or a fast power-up limit processing unit; wherein the content of the first and second substances,

the fast power-down limiting processing unit is configured to limit an output value of the power regulator in the current period to be less than or equal to an output value of the power regulator in the previous period if the power scheduling information is fast power-down indication information and a product of an input error of the power regulator in the previous period and a difference value of the input error of the power regulator in the current period and the input error of the power regulator in the previous period is less than 0;

and the fast power-up limiting processing unit is used for limiting the output value of the power regulator in the current period to be greater than or equal to the output value of the power regulator in the previous period if the power scheduling information is fast power-up indicating information and the product of the input error of the power regulator in the previous period and the difference value of the input error of the power regulator in the current period and the input error of the power regulator in the previous period is less than 0.

8. The apparatus according to claim 6, wherein the scheduling information obtaining module is specifically configured to calculate a difference between the set values of the power characterizing parameters of the current cycle and the previous cycle; if the difference value of the set values of the power characterization parameters of the current period and the previous period is smaller than a first preset threshold value, determining the power scheduling information as rapid power reduction indication information; and if the difference value of the set values of the power characterization parameters of the current period and the previous period is greater than a second preset threshold value, determining that the power scheduling information is rapid power-up indication information.

9. An arrangement according to any of claims 6-8, characterized in that the arrangement is arranged in a main controller of the wind power plant.

10. A storage medium having a program stored thereon, wherein the program, when executed by a processor, implements a wind park power control method according to any of claims 1-5.

Technical Field

The invention relates to the technical field of wind power generation, in particular to a method and a device for controlling power of a wind generating set and a storage medium.

Background

With the increasing wind energy scale, the power grid has higher and higher requirements for power scheduling of the wind generating set, for example, the current power grid requires that the wind generating set can reach a power set value within 1 minute (30 seconds are required by a part of provincial power grids).

Because the wind turbine generator system is unstable in operation due to too fast change of the power set value, the current power scheduling strategy is to limit the change amplitude of the power set value. For example, if the wind turbine is currently operating in a 50% Pn (Pn refers to the designed power of the wind turbine) state due to insufficient wind speed, if the scheduling requires the wind turbine to operate in a 30% Pn state with limited power, the wind turbine needs to decrease the power setting value from 100% Pn to 30% Pn instead of from 50% Pn, but the power setting is decreased at a fixed rate regardless of the 100% Pn to 50% Pn portion and the 50% Pn to 30% Pn portion.

That is, the prior art scheme does not distinguish between the 100% Pn to 50% Pn segment and the 50% Pn to 30% Pn segment, resulting in the 100% Pn to 50% Pn segment (virtual power segment) wasting time actually affecting power; conversely, when the wind generating set is in a 30% power-limited state and the power set value is required to be recovered to 100%, the wind generating set still needs to raise the power set value at a fixed rate, so that the power of the wind generating set slowly climbs, and the time actually influencing the power is wasted.

Disclosure of Invention

The embodiment of the invention provides a method, a device and a storage medium for controlling the power of a wind generating set, which can ensure that the wind generating set can complete power transition instantly on the premise of ensuring the stable operation of the wind generating set, thereby shortening the time for scheduling the power of the wind generating set.

In a first aspect, an embodiment of the present invention provides a method for controlling power of a wind turbine generator system, where the method includes:

obtaining power scheduling information of the wind generating set;

according to the power scheduling information, the input error of a power regulator of the wind generating set in the previous period and the difference value of the input error of the power regulator in the current period and the input error of the power regulator in the previous period, the output value of the power regulator in the current period is limited, and the wind generating set can stably run in the power scheduling period; the input error is the difference between the measured value of the power characterization parameter of the wind generating set and the corresponding set value.

In a possible embodiment of the first aspect, defining an output value of the power regulator in the current period according to the power scheduling information, and an input error of the power regulator of the wind turbine generator system in the previous period, and a difference between the input error of the power regulator in the current period and the input error of the power regulator in the previous period, includes: if the power scheduling information is the rapid power reduction indication information, and the product of the input error of the power regulator in the last period and the difference value of the input error of the power regulator in the current period and the input error of the power regulator in the last period is less than 0, limiting the output value of the power regulator in the current period to be less than or equal to the output value of the power regulator in the last period; and/or if the power scheduling information is the fast power-up indication information, and the product of the input error of the power regulator in the last period and the difference value of the input error of the power regulator in the current period and the input error of the power regulator in the last period is less than 0, limiting the output value of the power regulator in the current period to be greater than or equal to the output value of the power regulator in the last period.

In one possible implementation of the first aspect, obtaining power scheduling information of the wind turbine generator set includes: calculating the difference value of the set values of the power characterization parameters of the current period and the previous period; if the difference value of the set values of the power characterization parameters of the current period and the previous period is smaller than a first preset threshold value, determining the power scheduling information as fast power reduction indication information; and if the difference value of the set values of the power characterization parameters of the current period and the previous period is greater than a second preset threshold value, determining the power scheduling information as the rapid power-up indication information.

In a possible embodiment of the first aspect, the power characterizing parameter comprises a wind turbine generator set rotational speed or power.

In one possible embodiment of the first aspect, the power regulator is a pitch angle regulator or a torque regulator.

In a second aspect, an embodiment of the present invention provides a power control apparatus for a wind turbine generator system, where the apparatus includes:

the scheduling information obtaining module is used for obtaining power scheduling information of the wind generating set;

the limiting processing module is used for limiting the output value of the power regulator in the current period according to the power scheduling information, the input error of the power regulator of the wind generating set in the previous period and the difference value of the input error of the power regulator in the current period and the previous period, so that the wind generating set stably operates in the power scheduling period; the input error is the difference between the measured value of the power characterization parameter of the wind generating set and the corresponding set value.

In one possible implementation of the second aspect, the defining the processing module comprises: a fast power-down limit processing unit and/or a fast power-up limit processing unit; the power scheduling information is power scheduling information, and the product of an input error of the power regulator in a previous period and a difference value between an input error of the power regulator in a current period and an input error of the power regulator in the previous period is less than 0; and the fast power-up limiting processing unit is used for limiting the output value of the power regulator in the current period to be greater than or equal to the output value of the power regulator in the last period if the power scheduling information is the fast power-up indicating information and the product of the input error of the power regulator in the last period and the difference value of the input error of the power regulator in the current period and the input error of the power regulator in the last period is less than 0.

In a possible implementation manner of the second aspect, the scheduling information obtaining module is specifically configured to calculate a difference between a set value of the power characterizing parameter of the current cycle and a set value of the power characterizing parameter of the previous cycle; if the difference value of the set values of the power characterization parameters of the current period and the previous period is smaller than a first preset threshold value, determining the power scheduling information as fast power reduction indication information; and if the difference value of the set values of the power characterization parameters of the current period and the previous period is greater than a second preset threshold value, determining the power scheduling information as the rapid power-up indication information.

In a possible embodiment of the second aspect, the device is provided in a master controller of the wind park.

In a third aspect, an embodiment of the present invention provides a storage medium, on which a program is stored, and the program, when executed by a processor, implements the wind turbine generator system power control method as described above.

In the embodiment of the present invention, the output value of the power regulator in the current period may be defined according to the power scheduling information, and the input error of the power regulator in the previous period and the difference value between the input error of the power regulator in the current period and the input error of the power regulator in the previous period.

According to the above description, since the power scheduling information, the input error of the power regulator in the previous period and the difference between the input error of the power regulator in the current period and the input error of the power regulator in the previous period may cause the wind turbine generator to have unstable operation during the transient power transition, therefore, the embodiment of the invention takes the power scheduling information, the input error of the power regulator in the previous period and the difference value of the input error of the power regulator in the current period and the previous period as the limiting factors of the output value of the power regulator in the current period, can effectively avoid the unstable operation of the fan caused by larger transient power transition process, therefore, on the premise of ensuring the stable operation of the wind generating set, the power transition is completed instantly, and the time for power dispatching of the wind generating set is greatly shortened.

Drawings

The present invention may be better understood from the following description of specific embodiments thereof taken in conjunction with the accompanying drawings, in which like or similar reference characters identify like or similar features.

Fig. 1 is a schematic flow chart of a power control method for a wind turbine generator system according to an embodiment of the present invention;

FIG. 2 is a schematic flow chart of a method for controlling power of a wind turbine generator system according to another embodiment of the present invention;

fig. 3 is a schematic diagram of a handover procedure of bfastpowerdown set according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a switching flow of bfastpoweruppet according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of the impact of the instantaneous power change settings on the pitch command prior to implementation of the present invention;

FIG. 6 is a schematic diagram of the impact of the instantaneous power change settings on the pitch command after implementation of the present invention;

fig. 7 is a schematic structural diagram of a power control device of a wind turbine generator system according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a power control device of a wind turbine generator system according to another embodiment of the present invention.

Detailed Description

Features of various aspects of embodiments of the invention and exemplary embodiments will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of embodiments of the invention.

Before discussing the technical solutions of the embodiments of the present invention, it is first explained why directly switching the power set value causes the wind turbine generator set to operate unstably. Generally, a pitch regulator or a torque regulator is adopted as a power regulator of a wind generating set, and taking the pitch regulator as a PI regulator as an example, the feedback regulation principle is as follows:

y(k)＝dy(k)+y(k-1) (2)

e(k)＝ω(k)-ω_r(k) (3)

wherein, K_pAnd k_iFor adjusting parameters, dT is the operation period of the regulator, k represents the current period, k-1 represents the previous period, e (k) represents the error input of the current period, e (k-1) represents the error input of the previous period, y (k) represents the output of the controller of the current period, omega (k) represents the measured rotating speed of the current period_r(k) Indicating the set speed for the current cycle.

Assuming e ═ e (k) -e (k-1), substituting it into equation (1), one can obtain:

next, in connection with all possible input cases of the variables e (k-1) and e in equation (4), the conditions required for the pitch angle position increase (dy (k) >0) are determined, starting from the triggering feathering angle:

inputting A: [ e (k-1) <0, e <0]

Wherein e (k-1) <0 indicates that the measured rotation speed of the previous period before the setting is changed is less than the set rotation speed, and e <0 indicates that the rotation speed error input of the current period is becoming smaller compared with the previous period. If dy (k) >0 is required, then the inequality can be obtained by processing equation (4):

wherein the content of the first and second substances,due to the fact thatThus, inequality (5) does not hold, i.e., feathering must not occur with input a.

Inputting B: [ e (k-1) <0, e >0]

Wherein e (k-1) <0 indicates that the measured rotation speed of the previous cycle before changing the setting is less than the set rotation speed, and e >0 indicates that the rotation speed error input of the current cycle is becoming larger compared to the previous cycle. If dy (k) >0 is required, then the inequality can be obtained by processing equation (4):

since inequality (6) holds when the absolute value of e is large, it can be understood that feathering may occur in the case of input B.

Inputting C: [ e (k-1) >0, e <0]

Wherein e (k-1) >0 represents that the measured rotation speed of the previous period before the setting is changed is greater than the set rotation speed, and e <0 represents that the rotation speed error input of the current period is smaller compared with the previous period. If dy (k) >0 is required, then the inequality can be obtained by processing equation (4):

since inequality (7) holds when the absolute value of e is small, it can be understood that feathering may occur in the case of input C.

Inputting D: [ e (k-1) >0, e >0]

Wherein e (k-1) >0 represents that the measured rotation speed of the previous period before the setting is changed is greater than the set rotation speed, and e <0 represents that the rotation speed error input of the current period is smaller compared with the previous period. If dy (k) >0 is required, then the inequality can be obtained by processing equation (4):

due to the fact thatTherefore, the inequality (8) holds, that is, feathering must occur in the case of the input D.

The relationship between blade pitch angle and wind energy absorption is: the closer the pitch angle position is to 90 degrees, the smaller the energy absorbed by the wind generating set from the wind, and the closer the pitch angle position is to 0 degrees, the larger the energy absorbed by the wind generating set from the wind. Of the four input cases, input B and input C are abnormal.

As explained above, when the absolute value of e is larger for input B, dy (k) >0 means that the fan power (or rotation speed) set value is changed a lot at a moment, which is equivalent to that when a larger e is artificially manufactured, the fan operation is unstable. For example, under the condition of limited power, when the virtual power segment range is large, the power setting value is rapidly changed, which may cause the position of the pitch angle of the fan to increase, cause the position of the pitch angle to jump, and affect the stable operation of the fan, so that interference needs to be performed on the condition.

For the input C, when the absolute value of e is small, dy (k) >0, whereas when the absolute value of e is large, dy (k) <0 may be caused, which means that the setting value of the fan power (or the rotating speed) is changed in a large range instantaneously, which means that the fan operation is unstable due to artificially manufacturing large e. For example, in the case of power increase, the blade pitch angle should be decreased, but e (k-1) >0 indicates that the wind speed is increasing, and in order to ensure stable operation of the fan, it is necessary to increase the pitch angle by increasing dy (k) >0 by interfering with this.

Based on the analysis, the embodiment of the invention provides a method and a device for controlling the power of a wind generating set and a storage medium.

Fig. 1 is a schematic flow chart of a power control method for a wind turbine generator system according to an embodiment of the present invention. As shown in fig. 1, the method for controlling the power of the wind turbine generator system includes steps 101 and 102.

In step 101, power scheduling information of the wind turbine generator set is obtained.

The power scheduling information related to the embodiment of the invention mainly comprises: fast power down indication information, which means that there may be a virtual power segment (e.g., 100% -50% power segment), and fast power up indication information, which means that there is a need to raise the power setting at a fixed rate, both of which have a certain time waste.

In an example, the specific content of the power scheduling information may be determined by a difference between a set value of a power characterizing parameter of a current cycle and a set value of a power characterizing parameter of a previous cycle, where the power characterizing parameter includes a wind turbine generator set rotation speed or power.

Specifically, if the difference between the set values of the power characterizing parameters of the current cycle and the previous cycle is smaller than a first preset threshold, the power scheduling information is determined to be the fast power-down indication information.

For example, the power set value of the current period is 30%, the power set value of the previous period is 50%, the first preset threshold is-15%, and since 30% minus 50% is-20%, and-20% is less than-15%, it can be determined that the power scheduling information at this time is the fast power down indication information.

And if the difference value of the set values of the power characterization parameters of the current period and the previous period is greater than a second preset threshold value, determining the power scheduling information as the rapid power-up indication information.

For example, the power set value of the current period is 80%, the power set value of the previous period is 30%, and the first preset threshold is 30%, since 50% is obtained by subtracting 30% from 80%, and 50% is greater than 30%, it can be determined that the power scheduling information at this time is the fast power-up indication information.

In step 102, an output value of the power regulator in the current period is limited according to the power scheduling information, an input error of the power regulator of the wind generating set in the previous period and a difference value of the input error of the power regulator in the current period and the input error of the power regulator in the previous period, so that the wind generating set stably operates in the power scheduling period.

The input error is a difference value between a measured value of the rotating speed or power of the wind generating set and a corresponding set value, and the power regulator regulates parameters such as a pitch angle or torque through the input error so as to execute a power dispatching command.

As described above, the embodiment of the present invention may define the output value of the power regulator in the current period according to the power scheduling information, and the input error (e (k-1)) of the power regulator in the previous period and the difference (e) of the input error of the power regulator in the current period and the previous period.

According to the above description, in the transient power transition process, the power scheduling information and the different values of (e (k-1)) and e may cause the wind turbine generator system to have unstable operation, so that the embodiment of the invention uses the power scheduling information and e (k-1) and e as the limiting factors of the output value of the power regulator in the current period, thereby effectively avoiding the unstable operation of the fan caused by the larger e in the transient power transition process, further ensuring that the wind turbine generator system can operate stably, instantly completing the power transition, and greatly shortening the time of the power scheduling of the wind turbine generator system.

Fig. 2 is a schematic flow chart of a power control method for a wind turbine generator system according to another embodiment of the present invention. Fig. 2 differs from fig. 1 in that step 102 in fig. 1 may be refined to step 1021 and/or step 1022 in fig. 2.

In step 1021, if the power scheduling information is the fast power down indication information, and the product of the input error of the power regulator in the previous period and the difference between the input error of the power regulator in the current period and the input error of the power regulator in the previous period is smaller than 0, the output value of the power regulator in the current period is limited to be smaller than or equal to the output value of the power regulator in the previous period.

In step 1022, if the power scheduling information is the fast power-up indication information, and the product of the input error of the power regulator in the previous period and the difference between the input error of the power regulator in the current period and the input error of the power regulator in the previous period is less than 0, the output value of the power regulator in the current period is limited to be greater than or equal to the output value of the power regulator in the previous period.

In the embodiment of the present invention, the interference is mainly performed for the case where the product of the input B and the input C, that is, the input error of the power regulator in the previous period and the difference between the input error of the power regulator in the current period and the input error in the previous period is less than 0 (that is, e (k-1) × e < 0):